42le5500 presentation
TRANSCRIPT
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42LE550042LE55001080P 42LE550042LE5500LED Backlights
1080PDirect View LCD
Training
LCD-DV Troubleshooting42" Class Full HD 1080PLCD TV (42" diagonally)
Published October 8th, 2010Updated March 09th, 2011
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OUTLINEOUTLINE
Preliminary Section:yContact Information, Preliminary Matters, Specifications,LCD Overview, General Troubleshooting Steps, Signal Distribution, Disassembly Instructions and Voltages
Troubleshooting Section: Board Operation Troubleshooting of :
Signal Distribution, Disassembly Instructions and Voltages
Disassembly Section: Removal of Circuit Boards
Switch Mode Power Supply with LED Backlight Driver Board
Main Board
Soft Touch Keys
Ft Control Board
y
Speakers
October 2010 LCD TV 42LE55002
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42LE5500 LCD Direct View Display
Overview of Topics to be DiscussedOverview of Topics to be Discussed
42LE5500 LCD Direct View Display
Section 1This Section will cover Contact Information and remind the Technician of Important Safety Precautions for the Customers Safety as well as the Technician and the Equipment.
Basic Troubleshooting Techniques which can save time and money sometimes can be overlooked. These techniques will also be presented.
Thi S ti ill t th T h i i f ili ith th Di bl Id tifi ti dThis Section will get the Technician familiar with the Disassembly, Identification and Layout of the LCD Display Panel.
f S f CAt the end of this Section the Technician should be able to Identify the Circuit Boards and have the ability and knowledge necessary to safely remove and replace any Circuit Board or Assembly.
October 2010 LCD TV 42LE55003
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IMPORTANT SAFETY NOTICEIMPORTANT SAFETY NOTICE
Preliminary Matters (The Fine Print)Preliminary Matters (The Fine Print)
IMPORTANT SAFETY NOTICEIMPORTANT SAFETY NOTICE
The information in this training manual is intended for use by persons possessing an adequate background in electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major Product, personal injury and property damage can result. The manufacturer or seller maintains no liability for the interpretation of this information, nor can it assume any liability in conjunction with its use. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury If wires screws clips straps nuts or washers used to complete a ground path are removed foruser injury. If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed for service, they must be returned to their original positions and properly fastened.
CAUTIONCAUTIONCAUTIONCAUTION
To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also be g p p , p y p g yaware that many household products present a weight hazard. At least two people should be involved in the installation or servicing of such devices. Failure to consider the weight of an product could result in physical injury.
October 2010 LCD TV 42LE55004
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ESD NoticeESD Notice (Electrostatic Static Discharge)(Electrostatic Static Discharge)
Todays sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage the electronics in a manner that renders them inoperative or reduces the time until their next failure. Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively, you can touch your finger repeatedly to a ground connection point or unpainted metal in the product. Before removing a replacement part from its package, touch the anti-static bag to a ground connection point orremoving a replacement part from its package, touch the anti static bag to a ground connection point or unpainted metal in the product. Handle the electronic control assembly by its edges only. When repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.
l fl fRegulatory InformationRegulatory Information
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful g p p ginterference when the equipment is operated in a residential installation. This equipment generates, uses, and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user isradio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and the receiver; Connect the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the dealer or an experienced radio/TV technician for help.
October 2010 LCD TV 42LE55005
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Customer Service (and Part Sales) (800) 243-0000
LG Contact Information
Technical Support (and Part Sales) (800) 847-7597USA Website (GSFS) http://gsfs-america.lge.comCustomer Service Website http://www.us.lgservice.comKnowledgebase Website http://lgtechassist.comLG Web Training https://lge.webex.com
New: 2010/11 Wireless Ready Models Software Downloads
Presentations with Audio/Video and Screen Notations
LG CS Learning Academy http://ln.lge.com/ilearn http://136.166.4.200
Training Manuals, Schematics with Navigational Bookmarks, Start-Up Sequence, Owners Guides, I t t Di Di i C t ID P d t Pi t d F t
Also available on the Plasma Page:PDP Panel Alignment Handbook,
Plasma Control Board ROM Update (Jig required)
Interconnect Diagrams, Dimensions, Connector IDs, Product Pictures and Features.
Published October 2010 by LG Technical Support and TrainingLG Electronics Alabama, Inc.
Plasma Control Board ROM Update (Jig required)
October 2010 LCD TV 42LE55006
201 James Record Road, Huntsville, AL, 35813.
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Safety and Handling Regulations
LCD Direct View OverviewLCD Direct View Overview
1. Approximately 20 minute pre-run time is required before making any picture performance adjustments from the Menu.
2. Refer to the Voltage/Current silk screening on the Switch Mode Power Supply.3. C-MOS circuits are sensitive to static electricity.3. C MOS circuits are sensitive to static electricity.
Use caution when dealing with these IC and circuits.4. Exercise care when making voltage and waveform checks to prevent costly short circuits
from damaging the unit. 5. Be cautious of lost screws and other metal objects to prevent a possible short in the 5 e cau ous o os sc e s a d o e e a objec s o p e e a poss b e s o e
circuitry.
Checking Points to be Considered
1. Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number accuracy.
2 Check the model label Verify model names and board model matches2. Check the model label. Verify model names and board model matches.3. Check details of defective condition and history. Example: Oscillator failure dead set, etc
October 2010 LCD TV 42LE55007
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Basic Troubleshooting StepsBasic Troubleshooting Steps
Define, Localize, Isolate and Correct
Define Look at the symptom carefully and determine what circuits could be causing the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric material and give off a distinct odor Frequency of power supplies will change with the load or listen forand give off a distinct odor. Frequency of power supplies will change with the load, or listen for relay closing etc. Observation of the front Power LED may give some clues.
Localize After carefully checking the symptom and determining the circuits to be checked and after giving a thorough examination using your senses the first check shouldchecked and after giving a thorough examination using your senses the first check should always be the DC Supply Voltages to those circuits under test. Always confirm the supplies are not only the proper level but be sure they are noise free. If the supplies are missing check the resistance for possible short circuits.
Isolate To further isolate the failure, check for the proper waveforms with the Oscilloscope to make a final determination of the failure. Look for correct Amplitude Phasing and Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes glitches or road bumps will be an indication of an imminent failureglitches or road bumps will be an indication of an imminent failure.
Correct The final step is to correct the problem. Be careful of ESD and make sure to check the DC Supplies for proper levels. Make all necessary adjustments and lastly always perform a Safety AC Leakage Test before returning the product back to the Customer
October 2010 LCD TV 42LE55008
perform a Safety AC Leakage Test before returning the product back to the Customer.
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42LE5500 PRODUCT INFORMATION SECTION42LE5500 PRODUCT INFORMATION SECTION
This section of the manual will discuss the specifications of the42LE5500
October 2010 LCD TV 42LE55009
LCD Direct View Display
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Wireless Media Box (Sold Separately)
Wireless Media BoxWireless Media Box
The Wireless Media box communicates to the television via a wireless receiver called a Dongle. The Dongle attaches to the Television via two connections:
1. HDMI Cable from the Dongle to the TV to transfer Audio and Video Signals.2. Wired Remote cable between the TV and Dongle for Control Functions.
Media Box
2. Wired Remote cable between the TV and Dongle for Control Functions.
Wired Remote to control the Media Box
Wi l R i /T itt
TV A/V Inputs
Wireless Receiver/TransmitterDongle
Attaches via Velcro tothe back of the set
HDMI
October 2010 LCD TV 42LE550010
HDMI
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Wireless Wireless Network Adaptor (ANNetwork Adaptor (AN--WF100)WF100)
Wireless Network Adaptor Sold Separately
Using the LG Wireless LAN for Broadband Adaptor, which is sold separately, allows the TV to connect to a wireless LAN network. The Wireless Network adaptor attaches to the
Television via either of the two USB connections:
Allows access to DLNA: Digital Living Network Alliance
AP (Wireless Router)
Wireless AdaptorSide A/V
Cat 5 Cable withRJ 45 Connectors
DongleSide A/VInputs
on each side
October 2010 LCD TV 42LE550011
Modem
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Basic SpecificationsBasic Specifications
Key TV Featuresy LED Plus w/Local Dimming NetCast Entertainment Access*
(Wi Fi Read )
Intelligent Sensor AV Mode II
(Cinema Sports Game)(Wi-Fi Ready) Wireless 1080p Ready* DLNA Certified TruMotion 120Hz
(Cinema, Sports, Game) Clear Voice II ISFccc Ready 24P Real Cinema TruMotion 120Hz
Full HD 1080p Resolution 5M:1 Dynamic Contrast Ratio Picture Wizard II
24P Real Cinema USB 2.0 (JPEG, MP3, DivX HD) DivX HD 4 HDMI V 1 3 w/Deep Color Picture Wizard II
(Easy Picture Calibration) Smart Energy Saving ENERGY STAR Qualified
4 HDMI V.1.3 w/Deep Color SIMPLINK Connectivity Dolby Digital 5.1 Decoder Infinite Sound ENERGY STAR Qualified Infinite Sound
October 2010 LCD TV 42LE550012
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Logo Familiarization Page 1 of 4Logo Familiarization Page 1 of 4
LED PlusPrepare to be dazzled. Tired of dark scenes or dull colors? LGs LED Plus technology provideseven greater control of brightness through localdimming to deliver amazing clarity and colordetail, as well as a more energy efficient TVcompared to conventional TVs.
TruMotion 120HzSee sports, video games and high-speed action with virtually no motion blur and in crystal clarity with LGs TruMotion 120Hz technology. Now your TV can keep up with the fastest moving scenes.
NetCastEntertainment on tap. NetCast Entertainment Access brings the best Internet services direct to your TVno computer required. Instantly access movies and TV shows, news and weather and the worlds largest library of
October 2010 LCD TV 42LE550013
HD movies in 1080p.
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Logo Familiarization Page 2 of 4Logo Familiarization Page 2 of 4
FULL HD RESOLUTION 1080P HD R l ti Pi l 1920 (H) 1080 (V)FULL HD RESOLUTION 1080P HD Resolution Pixels: 1920 (H) 1080 (V)Enjoy twice the picture quality of standard HDTV with almost double the pixel resolution. See sharper details like never before. Just imagine a Blu-ray disc or video game seen on your new LG Full HD 1080p TV.
HDMI (1.3 Deep Color) Digital multi-connectivity HDMI (1.3 Deep color) provides a wider bandwidth (340MHz, 10.2Gbps) than that of HDMI 1.2, delivering a broader range of colors, and also drastically improves the data-transmission
Invisible SpeakerPersonally tuned by Mr. Mark Levinson for LG TAKE IT TO THE EDGE newly introduces Invisible Speaker
speed.
TAKE IT TO THE EDGE newly introduces Invisible Speaker system, guaranteeing first class audio quality personally tuned by Mr. Mark Levinson, world renowned as an audio authority. It provides Full Sweet Spot and realistic sound equal to that of theaters with its Invisible Speaker.
AV Mode "One click" Cinema, THX Cinema, Sport, Game mode.TAKE IT TO THE EDGE is a true multimedia TV with an AV Mode which allows you to choose from 4 different modes of Cinema, Sports and Game by a single click of a remote control
October 2010 LCD TV 42LE550014
and Game by a single click of a remote control.
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Logo Familiarization Page 3 of 4Logo Familiarization Page 3 of 4
Clear Voice Clearer dialogue sound gAutomatically enhances and amplifies the sound of the human voice frequency range to provide high-quality dialogue when background noise swells.
Save Energy, Save MoneyIt reduces the plasma displays power consumption.The default factory setting complies with the Energy Star requirements and is adjusted to the comfortable level to be viewed at home.(Turns on Intelligent Sensor).
Save Energy, Save MoneyHome electronic products use energy when they're off to power features like clock displays and remote controls. Those that have earned the ENERGY STAR use as much as 60% less energy to perform these functions, while providing the same performance at the same price as less-efficient models. Less energy means you pay less on your energy bill. Draws less than 1 Watt in stand by.
October 2010 LCD TV 42LE550015
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Logo Familiarization Page 4 of 4Logo Familiarization Page 4 of 4
Wireless ReadyWireless ReadyWireless 1080p Connectivity lets you cut loose from messy wires and still get a stunning Full HD picture. Disclaimer: Wireless media kit required and sold separately.
Picture WizardGet easy self-calibration with on-screen reference points for key picture quality elements such as black level, color, tint, sharpness and backlight levels. Take the guesswork out of picture adjustments with g g p jthis simple-to-use feature. It's not actually magic, but it will sure seem that way.
5M:1 Dynamic Contrast Ratio5M:1 Dynamic Contrast RatioWorrying about dark scenes is a thing of the past. The mega contrast ratio of 5,000,000:1 delivers vivid colors and deep blacks.
I t lli t SIntelligent SensorThe Intelligent sensor will monitor the room lighting environment. When the room lights go out, the TV will automatically adjust the picture for the best viewing enjoyment.
October 2010 LCD TV 42LE550016
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42LE5500 Remote Control42LE5500 Remote Control
TOP PORTION
BOTTOM PORTIONp/n AKB72914003
October 2010 LCD TV 42LE550017
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TV Rear Input / Output JacksTV Rear Input / Output Jacks
Rear In/Out Jacks
Side In/OutUSB1 or USB2 for SoftwareUpgrades, Music, Videos and Photos. Also
for the Wireless Network adaptor.Rear In/Out Jacks pUSB 2
LAN
USB 1
LAN
Component or Composite
Video/Audio 3
Wireless Media BoxRemote Jack Head
PhonesMAIN BOARDRear and Side
Input/Output locationsHDMI 4
Phones
October 2010 LCD TV 42LE550018
HDMI 4
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Software Updates (New and Changed Functions)Software Updates (New and Changed Functions)A wireless Internet Connection will work for Automatic Software Downloads, however if there are problems completing download, a Wired Internet Connection is preferred.
For network setup assistance, press the green button for the Simple Manual.
Bring up the Customers Menu then Press the Red button on Remote. Scroll down to item 9 Network Connections
With Software Update Highlighted, Press Select on Remote.
October 2010 LCD TV 42LE550019
Continue on next page
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Software Updates (New and Changed Functions) ContinuedSoftware Updates (New and Changed Functions) Continued
Automatic Internet Software UpdateOff A tomatic Soft are pdate does not ork- Off : Automatic Software update does not work
- On : if new Software released, Software download notice appears at turn on with two choices, Yes and Remind Me Later.
Check Update versionCheck Update version- comparison current software version and
Released software version
Additional TV Checks can be made by
After completion of the test, a Pop up menu is displayed with preloaded back ground picture.Select NO if everything is OK.
yScrolling down.Picture, Sound and Network Test
y g
If you select Yes;Service call number, Model name,SW version and serial No. is displayed. Note: Confirm the Suffix of the model number.
If the Main board is replaced, the Model and Serial number must be reinserted
October 2010 LCD TV 42LE550020
into memory. See Model Number D/L.
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1) Create an LG_DTV folder on the USB Flash Drive
USB Automatic Software Download InstructionsUSB Automatic Software Download InstructionsCurrently Installed Version
Software Version
found on the USB Flash
DriveDrive
File found on the USB Flash Drive
2) Copy new software (xxx.epk) to "LG_DTV" folder. Make sure to have correct software file.
3) With TV turned on insert USB flash drive3) With TV turned on, insert USB flash drive.4) You can see the message
TV Software Upgrade (See figure to right)5) Cursor left and highlight "START" Button and
push Enter button using the remote control. 6) You can see the download progress Bar.7) Do not unplug until unit has automatically
restarted.8) When download is completed, you will see
COMPLETE
* CAUTION: Do not remove AC power or the USB Flash Drive. Do not turn off Power, during the upgrade process.
October 2010 LCD TV 42LE550021
COMPLETE . 9) Your TV will be restarted automatically.
Software Files are now available fromLGTechassist.com
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Manual Software Download:Manual Software Download:
Prepare the Jump Drive as described in the USB Automatic Download section and insert it into either of the USB ports.p p pBring up the Customers Menu and scroll to OPTIONS.Press the FAV key 7 times to bring up the Manual Download Screen.
Highlight the Software update file g g pand press SELECT to begin the download process.
WARNING:Use extreme CautionUse extreme Caution when using the Manual Forced Download Menu. Any file can be downloaded when
Example of files foundOn the Jump Drive
selected and may cause the Main board to become inoperative if the incorrect file was selected.
October 2010 LCD TV 42LE550022
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Accessing the Service MenuAccessing the Service Menu
To access the Service Menu.1) You must have either Service Remote. )
p/n 105-201M or p/n MKJ391708282) Press In-Start3) A Password screen appears.4) Enter the Password.)
Note: A Password is required to enter the Service Menu. Enter; 0000Se ce e u te ; 0000
Note: If 0000 does not work use 0413.
October 2010 LCD TV 42LE550023
MKJ39170828105-201M
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1. Country Group (Press OK to Save) Country Group Code Country Group Country2. Tool Option Tool Option 1 Tool Option 2 Tool Option 3 Tool Option 4 Tool Option 53. Adjust White Balance:4. Adjust ADC: 4809 Component 1080p Component RGB5. EDID(AC3): RGB HDMI1 HDMI2 HDMI3 HDMI4
02USUS
24832302915636445251802
OK(8) OK
OKOKOK
OKOK (0x1D)
OK (0x4,0x5A)OK (0x4,0x4A)OK (0x4,0x3A)OK (0x4,0x2A)
IN SARTModel Name: 42LE5500-UASerial Number: 912KCLH1P752S/W Version: MICOM VersionBOOT VersionFRC VersionIR LED VersionEDID Version (RGB)EDID Version (HDMI)Chip TypeWireless Host Ver.Wireless B/B/ Ver.Vi-Fi VersionVi-Fi ChannelWi-Fi MAC : 00:E0:91:D1:0B:E1MAC Address : 00:E0:91:C6:A0:1BESN Num. : LGE-LE4200XXXX000A0C9037Local Dimming Ver.Debug Status
UTT : 37APP History Ver.:49324PQL DB:LGD_EF_LGT10_ALLxN42
1. Adjust Check2. ADC Data3. Power Off Status4. System 15. System 26. Model Number D/L7. Test Option8. External ADC9. Spread Spectrum10. Sync Level11. Wireless Ready12. Stable Count13. ODC Test14. Local Dimming
Adjust Check
: 08.00.11.01: 3.06.6: 1.02.20: f0.f0: c8: 0.01: 0.02: BCM 3549: 0.00.0: 0.00.0:1.0: 1
:0x0703:RELEASE
42LE5500 Service Menu First Page42LE5500 Service Menu First Page
24 October 2010 42LE5500 LCD-DV
Bring up the Service Menu using the Service RemoteAnd pressing In-Start enter password 0413. (May also be 0000).
Unit Total Time
SW Version
CountryGroup
Audio Mode
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42LE5500-UA
42LE5500 Model Number Download Screen42LE5500 Model Number Download Screen
25 October 2010 42LE5500 LCD-DV
1. Adjust Check2. ADC Data3. Power Off Status4. System 15. System 26. Model Number D/L7. Test Option8. External ADC9. Spread Spectrum10. Sync Level11. Wireless Ready12. Stable Count13. ODC Test14. Local Dimming
0. Model Name1. Serial Num.
Model Number D/L
Press OK to Save
912KCLH1P752
Bring up the Service Menu using the Service Remote.Scroll down to item 6. Model Number D/L to highlight.Press Select or Cursor Right.
Change the Model and Serial Number to match. To Change the Model Number Use the cursor right or left to select the area to change. Use the cursor up or down to change.Cursor right until there is no text cursor blinking.Scroll down to highlight Serial Number and change.
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42LE5500 UTT Reset (IN START) Screen42LE5500 UTT Reset (IN START) Screen
26 October 2010 42LE5500 LCD-DV
1. Adjust Check2. ADC Data3. Power Off Status4. System 15. System 26. Model Number D/L7. Test Option8. External ADC9. Spread Spectrum10. Sync Level11. Wireless Ready12. Stable Count13. ODC Test14. Local Dimming
0. Baudrate1. 2 Hours Off (On Timer)2. 2 Hours Off (Screen Mute)3. 15Min Force Off4. Audio EQ5. Audio Bass EQ6. A2 Threshold7. HDMI Sound(Port1)8. Lip Sync Adjust(ATV)9. Dimming10. Tuner Option11. Atten RF Signal12. UTT Reset13. Channel Mute14. Debug Status15. NVRAM Type16. HDEV17. Blue back18. China Cable SO19. Booster On (VHF)20. Booster Off (VHF)21. Booster On (UHF)22. Booster Off (UHF)
IN SART SYSTEM 1Model Name: 42LE5500-UASerial Number: 912KCLH1P752S/W Version: MICOM VersionBOOT VersionFRC VersionIR LED VersionEDID Version (RGB)EDID Version (HDMI)Chip TypeWireless Host Ver.Wireless B/B/ Ver.Vi-Fi VersionVi-Fi ChannelWi-Fi MAC : 00:E0:91:D1:0B:E1MAC Address : 00:E0:91:C6:A0:1BESN Num. : LGE-LE4200XXXX000A0C9037Local Dimming Ver.Debug Status
UTT : 37APP History Ver.:49324PQL DB:LGD_EF_LGT10_ALLxN42
9600OnOffOnOnOn11
HDMI Port10
OnEnhanced Ghost
OffReset
OnRELEASEEEPROM
OffOnOn0000
Scroll to (UTT Reset)
Press (Select)Reset changes to Doing
then back to Reset
Scroll to (System 1)
thenRight Cursor
: 08.00.11.01: 3.06.6: 1.02.20: f0.f0: c8: 0.01: 0.02: BCM 3549: 0.00.0: 0.00.0:1.0: 1
:0x0703:RELEASE
After Reset (Doing) has completed, Reset returns.After Exit the UTT Timer is
0
Unit Total Time
Changes to Doing
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Service Menu: Downloading EDID Data Pg 1 of 2Service Menu: Downloading EDID Data Pg 1 of 2
1) Press ADJ key. 2) Select menu, Either PCM EDID D/L or AC3 EDID D/L
October 2010 LCD TV 42LE550027
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Service Menu: Downloading EDID Data Pg 2 of 2Service Menu: Downloading EDID Data Pg 2 of 2
3) Highlight Start then Press Select key
4) When Writing appearsDownloading in progress
5) Downloading Completethen Press Select key. Downloading in progress
When PCM EDID D/L was selected
When AC3 EDID D/L was selected
Note: When PCM is downloaded, AC3 will be N/G and when AC3 is downloaded PCM will be N/G. Thi th t h PCM i OK PCM di i i it d h AC3 i OK AC3 di i
October 2010 LCD TV 42LE550028
This means that when PCM is OK, PCM audio is priority and when AC3 is OK, AC3 audio is priority.
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4) Cursor Left to only highlight the briefcase
Accessing the Host Diagnostic Screen Accessing the Host Diagnostic Screen (Page (Page 1 of 2)1 of 2)
1) Place Television on the digital channel that
Use the Host Diagnostic screen to investigate the signal quality of a problem channel.
2) Bring up the Customers Menu and highlight Options.
) y g gon the left.
) gmay be showing problems.
3) The Option Menu appears.5) Press the (1) Key 5 to 8 times.
October 2010 LCD TV 42LE550029
See next page for more details.
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Wireless Host Ver:0.00.0Wireless B/B Ver:0.00.0RF Region Config : Not ConfiguredMedia Box Type : Not ConfiguredRF Frequency (Value):Auto (N.A.)Uplink RF Power gain (Value):Auto (Min 0)Downlink RF Power gain (Value):Auto Link Mode : UnicastRX MAC Address : ff:ff:ff:ff:ff:ffTX MAC Address : ff:ff:ff:ff:ff:ffWireless connection status:DisconnectedAverage SNR [db]:0.0(0)
Host Information
Memory
Host Release Version
FAT Status (Main)
Current Channel (Main)
DVI/HDMI StatusCant display this information now
Channel Info : Digital 19-2
Parental Control : Channel is not blocked
Host Diagnostics
Model Name : 42LE5500-UA (Liquid Crystal Display)
FLASH : 524288 KBDRAM : 524288 KBNVM : 128 KB
Firmware Version(MP) : 8.00.11.01(51822)Micom Version : 3.06.5Compile Date & Time : 20101112 & 15:17:49Compile User : kyuhae.lee
Center Frequency : 663.00 MHzPCR lock : LockedModulation mode : QAM 256Carrier lock status : LockedSNR : 40 dBSignal level : 100%
Half Page Move Page ExitCH
30
Understanding the Host Diagnostic Screen (Page 2 of 2)Understanding the Host Diagnostic Screen (Page 2 of 2)
October 2010 42LE5500 LCD-DV
Channel Selected
Software Version
Blocked or not Blocked
Channel Frequency
Program Clock Reference (Locked or No)Channel Type (8VSB, QAM 64, 256)
Channel (Locked or No)Channel Signal to Noise Ratio
Channel Signal Level (Above 80% good)
8VSB (Above 20 is good)QAM 64 (Above 24 is good)
QAM 256 (Above 30 is good)
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Weight w/o Stand 36.8 lbsWeight with Stand 43 lbs
42LE5500 Product Dimensions42LE5500 Product Dimensions
7.7/8"200mm
24.13/16"629.92mm
40"1016mm
Remove 4 screws to remove stand for
wall mount
20.7/16"510mm
27.3/16"690.88mm
1.3/16"30.48mm
10.5/8"269.24mm
7.7/8"200mm
5.9/16"142mm
11.5/16"288mm
2.3/8" (60.96mm)
Center
There must be at least 4 inches of Clearance on all sides
31
17.5/16"440mm
12.3/8"314.96mm
Model No.Serial No.
Label
WattageLocal Dimming TBDFull White TBDStand By 0.1W
October 2010 42LE5500 LCD-DV
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DISASSEMBLY SECTIONDISASSEMBLY SECTION
Disassembly:This section of the manual will discuss Disassembly, Layout
(Ci it B d Id tifi ti ) f th 42LE5500 LCD Di t Vi T l i i(Circuit Board Identification) of the 42LE5500 LCD Direct View Television.
Upon completion of this section the Technician will have a better understanding of the disassembly procedures, the layout of the printedunderstanding of the disassembly procedures, the layout of the printed
circuit boards and be able to identify each board.
October 2010 LCD TV 42LE550032
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Removing the Back Cover Removing the Back Cover
Remove the 28 screws indicated.Pay attention to the size and type of screwPay attention to the size and type of screw
as there are many different types.Putting in an improper screw when reassembling may Cause damage.
The AC CordDoes Not unplugRemove plastic
cover.cover.
The Stand Bracket has a plastic cover Not Shown that must be removed to
October 2010 LCD TV 42LE550033
The Stand has to be removed before removing the back.expose the screws.
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Warning: The Frame has
Clips hold the front glass in place, use caution. Add screws while servicing.Circuit Board LayoutCircuit Board Layout
Warning: The Frame has very sharp edges
To LEDs
Main BoardPower Supply Main Board(SMPS)
LVDS Cables
Panel Connection Points
InvisibleIR/LED Soft Touch InvisibleLG Logo
October 2010 LCD TV 42LE550034
InvisibleSpeaker Right
IR/LED Board
Soft TouchKeyboard
InvisibleSpeaker Left
LG Logo Board
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MAINBOARD
POWERSUPPLY
Speaker (Front Left)
AC In
IR LED
42LE5500 Connector Identification Diagram42LE5500 Connector Identification DiagramTFT PANEL
35 October 2010 42LE5500 LCD-DV
Speaker (Front Right)Soft Touch Keys
p/n: EBU60904603p/n: EBR66101301p/n: EBU60904602
p/n: EBR64966201
p/n: EAJ60871201
p/n: EAB60961501 p/n: EAB60961501p/n: EAV60793302p/n: EBR64966801
p/n: EAY60803101p/n: EAY60803201
n/c
n/c
SK101
P204
P7501 P7500 P8000
P8200P8800
J1J2
J3
ToTFT
Panel
If the Panel is replaced, reset the UTTTime. Service Menu, System 1 Item 12
P205
P201
To LEDs
White Plug
Black Plug
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Power Supply Power Supply Board RemovalBoard Removal
P201Board is Thin be
p/n EAY60803101
Press in gently on the two
Board is Thin, be careful not to flex.
Disconnect P201, P204,
P205 and AC
tabsto release
lock
In SK101.SK101 fits very snug into its connector.
Remove the 6 screws indicated
SK101
by the arrows.AC In
Press in on thetwo tabs
October 2010 LCD TV 42LE550036
to release lock
-
Removing the Main BoardRemoving the Main Board Flip the locking tab upward, pull the LVDS ribbon out.p/n EBU60904603
Disconnect P7500, P7501, P8000, P8200 and P8800
P7501 P7500P8000
Remove any tape holding down any cables.
Remove the 7 screws N/C
Press in on the side release
tabs to remove.indicated by the arrows.
Decorative Metal PlateRemove decorative N/C
NOTE: Always check on
plastic and remove the board. After removing the Main, there
are tabs sticking through the Main board holding the Metal
plate in place.
top and behind the Large ICs. And look for a piece
of Chocolate(Heat Transfer Material).
Be sure to transfer to new Board if present
P8800 P8200
October 2010 LCD TV 42LE550037
new Board if present.
-
Removing Front IR BoardRemoving Front IR BoardDisconnect J1, J2 and J3 connectors.
Press upward on the two tabs at the top. Tilt the board downward.
TabTab
p p
Lift straight up To Clear the Tabs at the bottom.
J3
Tab
IR board / Intelligent SensorJ3
J1
p/n EBR64966201
Tab Tab
October 2010 LCD TV 42LE550038
p/n EBR64966201
-
TROUBLESHOOTING SECTIONTROUBLESHOOTING SECTION
Troubleshooting:gThis section of the manual will discuss troubleshooting.
Upon completion of this section the Technician will haveUpon completion of this section the Technician will have a better understanding of how to diagnosis and resolve
problems.
October 2010 LCD TV 42LE550039
-
POWER SUPPLY SECTIONPOWER SUPPLY SECTIONThis switch mode power supply develops Stand By 3.5V at all times when AC is applied.At power on, it develops 12V and 20V for the Main board.It develops 120V for the LED Backlights.
This power supply draws less than 1 watt during stand by mode. The fuse F101 and F103 reads 7.6V (from hot ground) during this time.
When the controller chip receives the PWR-ON commandWhen the controller chip receives the PWR ON command 3.36V via P201 Pin 1, the primary section increases its current supplying ability. Both Primary fuses F101 and F103 now read a little more than 395V. T102 delivers AC to D206 which develops the 120V for th LED b kli htthe LED backlights.
P201 Connector: (To Main Board)12V (11.43V) is routed out P201 pins 17, 19 and 21 and 20V (21.27V) is routed out P201 pins 2, 3 and 4. ( ) p ,
P204 Connector: (To Panel LEDs)120V is routed out P204 pins 1 and 12.
P205 Connector: (To Panel LEDs)
October 2010 LCD TV 42LE550040
P205 Connector: (To Panel LEDs)120V is routed out P205 pins 1 and 12.
-
Power Supply (SMPS) Board LayoutPower Supply (SMPS) Board Layout p/n EAY60803101
F101F1013.15A/250V
F1031A/250V
STBY 7.6VRun 396V
From Hot Gnd
F100 5A/250V5A/250V
F1021A/250V
AC Protect
Hot Ground Shock Hazard
October 2010 LCD TV 42LE550041
-
42LE5500 Power Supply Start Up Sequence42LE5500 Power Supply Start Up Sequence
42
Inverter OnStarts the Inverters
Stand By 3.5V
Remote or Power Button Key
MAIN BOARD
RL_ONInvOn
Stand By3.5V Reg
2 5 66 8
4
5
Primary side fuses:Stand-By 7.6V Run 396V (Hot Gnd)
3
12V 20V
12V
At point TV is in Stand-By state. Energy Star compliant.0 .1 Watts
3
Other Regs
LCD PANELTo Panel Backlights
120HzManipulates Backlight
LEDsLow = Bright
R
L
_
O
n
2
No AC Det in this
model
After Mute ReleasedLVDS Video
Ft IRKey
120V
Model 1_Opt1 Panel Control
INV_CTL
Microprocessor IC8101
RL_ON
And Tru-Motion LVDS Video
Q8004
P201
T510 &Rectifier P205
P
o
w
e
r
O
n
Power On
5
P204
120V
P8000
Soft Touch KeyP8200
I
n
v
e
r
t
e
r
O
n
P7500Reset
GeneratorC8108R8184
1AC In
3.5V_ST
P
-
D
I
M
8
4
P7501
PanelVCC 12V
IC9103
3.3V, 16V, -5V,
26V,
DC toDC 7
5
7
Key 1 or IR
7
VideoProcessor
IC900
IC9102HVDD
7.8V
VCC 3.3V, VDD 16V, VGL -5V, VGH 26V,
HVDD 7.8V
IC93021.8V_L/ Dimming
7
SINMOSI, CLK12 Blocks
9
9
9
October 2010 42LE5500 LCD-DV
POWER SUPPLY (SMPS)POWER SUPPLY (SMPS)
BridgeRelaysT102D206
6
5 12V/20V Regulators
On BoardInverter
8
9
6
Local andGlobal Dimming
Local andGlobal Dimming
5
P-DIM1 (PWM-DIM)Pulse Width Dimming
Global DimmingManipulated by:
Cust Menu for Backlightand
Picture ContentManipulate P-DIM
Local Dimming (SIN)
IC9301Dimming
IC
8
8
22182~4
SeeNote 1:
IC8801Audio Amp
171921
19~12 16 Note 1:12V TURNS ON:IC8000 5V_USBIC8003 5V_NormalIC8005 3.3V_NormalIC8903 +3.3V_MEMCIC8902 +1.26V_MEMCMEMC=Motion Estimated Motion CompensatedFor Video Processor
Right Side Panel
Driver Board
Left Side Panel
Driver Board
P-DIM9
9
2
7
GlobarDimming
V-SYNC
9
23
-
0.38V~3.3VPWM-DIM PWM-DIM
0.09V
PWM-DIM (PWM Dimming) can vary according to incoming video IRE level, OSD Backlight setting and Intelligent Sensor (room light condition). Range 0.37V to 3.3V.
42LE5500 Television Turn On Commands Circuit Drawing42LE5500 Television Turn On Commands Circuit Drawing
R8019100
11.43V
Gnd
Gnd
Gnd
Gnd
3.36V
ERR OUT
PWR
INV_CTL
SMPSP201
R25
11
MAIN BoardP8000
3.5V
Gnd
1
65
87
109
1211
1415
19
17
21
18
24
22
1
65
87
109
1211
1415
19
17
21
18
24
22
Gnd
L8003
L8002+12V
C8001 100uF
R800010K
10
Q8005+3.3V_Normal
INV_CTL
S
2
6
D
7
Q8004
L8015
Panel_Vcc (12V)
3.36V
GQ8003
Model_Opt_1
1.8V
+12VR8010 10K
C8000100uF
+3.5V_ST
RL_ON
GPIO 09
3.28V
43
Q8002
L8000
+3.5V_ST
INV_On
PWR-ON IC8101Micro
RL_ON
Power Det 14
Reset40
Key 1 25
Key 2 26
PowerOn/Off 2_220
R80044.7K
3.5V
3.5V
3.5V
Q80010V
36
R8060 10K
+3.3V_Normal
Reset
Gnd13 13
16 160.02V
23 233.3V
Gnd (Not Used)
Q8000
R803210K
R818722
R818447K C8108
0.1uF
IC900BCM
R1041 0R8027 0
R817822
IR 16
R813522
R8103100
R800147KR8011 1.8K
To IC9103 DC to DC Conv T-CON
+12VL8013
IC8005
Power_On/Off2_2R8176
22K
R80261K
0.68V
R8003 22K
11.8V11.79V
11.8V
3.36V 8
0.66V0V
3.36V
3.3V 0V
0V
3.1V
21.27V
11.9V
R813422
October 2010 42LE5500 LCD-DV
32
432
4
L8005+20V
C802468uF
20V
21.27V
12V
P-DIM: Digital Dimming (Variable)
SBY3.5V
20 20
T6 M2_MOSI
IC9301Dimming
R9347 22M2_MOSI
R8076 0
SIN
21.27V
21.27V
11.43V
11.43V
U5
R935022VSYNC / R_VS
SCLK
R8078 0
VSYNC
SIN
R6 M2_SCLK
R_VSR9346 22R8077 0
M2_SCLKSCLK
VSYNC
(Data) 3.25V p/p Data
3.64V p/p
3.76V p/p
IC8007IC8008
3
1 1
2
2
3
4
4
4
4
5
6
6
7
7
88
8
9
9
9
9
9
4
1
-
AC Should not be applied at any time while adding jumpers or While unplugging connectors as damage to the circuit Board
Power Supply Board Low Voltage Test 1Power Supply Board Low Voltage Test 1
While unplugging connectors as damage to the circuit Board may occur.
a) When AC is applied, the SMPS MUST be producing STBY 3.5V on pins 9, 10, 11 or 12 of P201.
If 3.5V Standby is not being generated, the SMPS is defective and must be replaced. There is no need to continue with the next test.But, make sure AC is arriving at the connector SK101.
(b) Unplug P8000 on the Main Board to make insertion of the Jumpers easier. Use P700 Side to insert resistors
TEST 1:
Pin 1 is the Brown Wire
(1) Add a jumper between (3.5V STBY) pin 7, 8, 9 or 10 and Pin 1 (PWR_ON). Apply AC. This will turn on the power supply, relays will click.a) Check that the 20V (21.3V) and 12V (11.43V) power supplies are turned on,
P201 (12V pins 17, 19 and 21) P201 (20V pins 2 3 and 4) P201 (20V pins 2, 3 and 4) P204 and P205 (120V pins 1 and 12) to the Panel. (Or check D206 + lead)
(2) Remove AC powerNo Backlights during this test
You can however ground each individual driver and turn on each block one at a time for a quick backlight block
October 2010 LCD TV 42LE550044
You can however, ground each individual driver and turn on each block one at a time for a quick backlight block test. (Youll have to look from the back of the panel to see if the block turns on because the Panel is off.
-
Continue if the 1st test was OK. Leave original jumper in place.
Power Supply Board Backlights Test 2Power Supply Board Backlights Test 2
Leave original jumper in place.
(3) Add another jumper between (STBY_3.5V) pin 9, 10, 11 or 12 and Pin 18 (INV_On).
(4) Apply AC Power. Simulating a Power and Backlight On command.
Backlights Normal:) If l th b kli ht h ld ta) If normal, the backlights should turn on.
SMPS OK, Inverter OK.
Backlights Abnormal:a) Recheck all connections
Pin 1 is the Brown Wire
a) Recheck all connections.b) Confirm the DRV_ON line pulling up to at least 3V. c) Check the connections to the Panel.
If the DRV On command is pulling up to 3V and the 120V is being generated _ p g p g gfrom D206 + leg, see the Inverter Section of the Power Supply for additional checks. Note: If either P204 or P205 is disconnected, the backlights will come on,
The Error line will go high, then the backlights shut off in 4~6 seconds.
October 2010 LCD TV 42LE550045
REMOVE AC POWER:
-
42LE5500 2 Sided Edge Lit Panel (V5)42LE5500 2 Sided Edge Lit Panel (V5)
46 October 2010 42LE5500 LCD-DV
ONE STRIP (Board)
1 Block 1 Block 1 Block
Connector 4 pin
Front Side Panel View
1 Block
120V
32V p/p
LED Drive Signal 50 IRE
10mSec
DriverOn
SMPS6.32V drop per/LED
GlobalAnd
LocalDimmingControl
P204 or P205
TWO SIDED EDGE 2010
Input from SMPS InverterConnector Connector
Connector ConnectorOne LED can be tested with a Diode Check using a DVM. Forward biased, the LED should light.
Each Connector has (3) Block driver pins and (1) 120V Input pin
120VBlock
Control Signals(Drive)
Connector
LED 228 Total LEDs4 Boards (Strips)57 LEDs per/board
12 Total Blocks (6 on Top, 6 on Bottom)
3 Blocks per/board19 LEDs per/block
-
EB
C
E
B
C
E
B
C
E
B
C
E
B
C
E
B
C
E
B
C
E
B
C
E
BC
E
BC
E
BC
E
B
C
P204
P205
These drivers ground the LED blocks. (12 Total). If the 120V is present on Pins 1 and 12 of P204 and P205 you can ground these test points to turn on a block.
1V (100 IRE)30V (0 IRE)
42LE5500 Inverter Part of the SMPS42LE5500 Inverter Part of the SMPS
47 October 2010 42LE5500 LCD-DV
Gnd
Gnd
120V
120V
120V
120V
n/c
n/c
n/c
n/c
n/c
n/c
Local Dimming OnL-DIM (SIN)
Local Dimming OffL-DIM (SIN)
32V p/p
LED Drive Signal 50 IRE
3.64V p/p V-Sync Signal
3.25V p/p
3.25V p/p
*1V~30V LED Drive
*1V~30V LED Drive
*1V~30V LED Drive
*1V~30V LED Drive
*White 100 IRE to Black 0 IRE
INVERTER Section of the
SMPS
Inverter Top Left Connector1 VDD-33 3.5V2 VLED-RANGE 0V3 Gnd Gnd4 +12VS 12.44VPin 17-19-21 P2015 Gnd Gnd6 +3.5VS 3.57VPin 9-12 P201
Inverter Center Left Connector1 INV_ON 3.28VPin 18 P2012 Gnd Gnd3 Gnd Gnd4 SCLK 0.09VPin 20 P2015 FB_STR_VF 1V6 P-DM1 1.9VPin 22 P201
Inverter Bottom Left Connector1 Error 0VPin 24 P2012 (L-DIM) SIN 3.3VPin 23 P2013 POWER_ON 3.35VPin 1 P2014 VSYNC_IN 0VPin 16 P2015 Gnd Gnd6 Gnd Gnd
Pin 23 P201
Pin 23 P201
Pin 16 P201
3.76V p/p SCLK Signal
Pin 20 P201
100uSec
10mSec
100uSec
-
Power Supply Connector P201 Voltage and Diode CheckPower Supply Connector P201 Voltage and Diode Check
P201 Connector SMPS to Main P8000 P201 ConnectorP201 Label
Pin Label STBY Run Diode Check
24 ERROR Gnd Gnd *1.45V
23 L-DIM (SIN) 0V 3.3V Open
Odd pins are on
front row
22 PDIM1 0V 0.38V~3.3V Open
21 12V 0V 11.43V 0.178V
20 SCLK 0V 0.09V Open
19 12V 0V 11 43V 0 178V
1
19 12V 0V 11.43V 0.178V
18 DRV_ON (INV-ON) 0V 3.28V Open
17 12V 0V 11.43V 0.178V
16 V SYNC 0V 0 02V O
(1) PDIM1 Pin 22 can vary according to incoming video IRE level, OSD Backlight setting and then Intelligent Sensor
16 V_SYNC 0V 0.02V Open
13-15 Gnd Gnd Gnd Gnd
9-12 3.5V 3.57V 3.5V Open
5-8 Gnd Gnd Gnd Gnd g g g(room light condition) Output from the Video Processor IC900. Range 0.37V to 3.3V. .
2-4 20V 0V 21.27V 1.10V
1 PWR-ON 0V 3.36V 1.02V
PDIM13 66V p/p 50IRE
*Pin 24 is grounded on the Main Board
October 2010 LCD TV 42LE550048
Diode Mode values taken with all Connectors Removed3.66V p/p 50IRE
-
Power Supply Connector P204 / P205 Voltage and Diode CheckPower Supply Connector P204 / P205 Voltage and Diode Check
P204 "SMPS" to The Panel" P204Pin Label STBY Run Diode Check
12 02.A 0V 120V Open
Pin Label STBY Run Diode Check
12 04.A 0V 120V Open
P205 "SMPS" to The Panel"
12 02.A 0V 120V Open
11 n/c n/c n/c Open
10 02-1C 0V (1)1V~30V Open
9 02-2C 0V (1)1V~30V Open(1)
12 04.A 0V 120V Open
11 n/c n/c n/c Open
10 04-1C 0V (1)1V~30V Open
9 04-2C 0V (1)1V~30V Open(1)
1
P2058 02-3C 0V (1)1V~30V Open
7-6 n/c n/c n/c Open
5 01-3C 0V (1)1V~30V Open
4 01-2C 0V (1)1V~30V Open
8 04-3C 0V (1)1V~30V Open
7-6 n/c n/c n/c Open
5 03-3C 0V (1)1V~30V Open
4 03-2C 0V (1)1V~30V Open
1
3 02-1C 0V (1)1V~30V Open
2 n/c n/c 0V Open
1 01.A 0V 120V Open
3 03-1C 0V (1)1V~30V Open
2 n/c n/c 0V Open
1 03.A 0V 120V Open
(1) The drive signal changes due to the brightness level of the backlights. Low indicates Bright. High indicates Dim.
October 2010 LCD TV 42LE550049
Diode Mode values taken with all Connectors Removed
-
Power Supply Connector SK101 and AC Fuses Voltage and Diode CheckPower Supply Connector SK101 and AC Fuses Voltage and Diode Check
SK101 "SMPS" to AC INF100
6.3A/250VF102
1A/250V
Pin Label STBY Run Diode Check
EL1 L120Vac
OL
EL3 N OL
F100
AC IN
F102
AC
EL3 N OL
AC Voltage Readings (From Hot Ground)Pins 1 and 2 for STBY and RUN.
Diode Mode values taken with all Connectors Removed
F100 or F102 (Diode Check)F100 or F102 (Diode Check)
Red or Black Lead on Fuse (Open)Other Lead on Hot Ground
L N
Bottom Right of SMPS
October 2010 LCD TV 42LE550050
SK101
-
Power Supply F101 and F103 Voltage ChecksPower Supply F101 and F103 Voltage Checks
F1003.15A/250V
F1031A/250V
From Hot GndSTBY 7.6VRun 396V
From Hot GndSTBY 7.6VRun 396V
Run 396V
If the set was on and then turned off into the Stand-By condition, the voltage takes a very long time to bleed down to the reading given here.
October 2010 LCD TV 42LE550051
-
MAIN BOARD SECTIONMAIN BOARD SECTIONThe Main board receives its operational B+ from the Power Supply via P8000. There are two LVDS cable feeds that are output from the on-board T-CON (TFT Driver) section directly to the Panel. These carry the duel 12 bit LVDS Video and TruMotion Video equaling a 120Hz video signal. These signals have already been prepared for the Panels Left and Right boards. The Main board also includes the Tuner, Audio and Audio/Video inputs and selection circuits.
Input Voltages from SMPS.STAND-BY
STBY 3.5V (P8000 pins 9~12)
The Main board also develops several B+ sources on the board.
RUN 12V pins 13 and 14 20V pins 17 and 18.
LVDS Panel VCC (12V Not generated but switched
STAND-BY VOLTAGES 3.3V_ST (Voltage direct from SMPS).
GENERAL 5V_Normal (Made from 12V In). 3.3V_Normal (Made from 12V In). 5V USB (Made from 12V In).
Panel_VCC (12V Not generated, but switchedfrom the 12V arriving from the SMPS).
TUNER and VSB CIRCUIT 3.3V_TU (Made from 3.3V_Normal). 1.26V_TU (Made from 3.3V_TU).
BCM IC900 Micro/Video Processor 3.3V_ST, 1.2V, D1.5V, D1.8V
IC9301 Tru-Motion and Dimming IC 1.26V MEMC, 1.5V MEMC,
WIRELESS VOLTAGES to JK8700 20V (Switched from 20V from SMPS)
AUDIO IC8801
1.26V_MEMC, 1.5V_MEMC,and 3.3V_MEMC
T-CON IC9001 3.3V_VCC, -5V_VGL, 27V_VGH, 16V_VDD and HVDD (7.8V)
October 2010 LCD TV 42LE550052
1.8V (Made from 3.3V_Normal). HDMI VOLTAGES (Q200) 1.8V_HDMI (From D1.8V)
-
Main Board LayoutMain Board Layout
P7501
To Panel
P7500
P8000To SMPS
VIDEO PROCESSOR IC900, T-CON IC9001 and
Tru-Motion IC9301
See next page for component
identification IC901
IC9301
p/n:EBU60904603
Tru-Motion IC9301 run Hot.
This is normal.
P9000n/c
identification IC901
USB 1
P8100n/c
IC900
US
USB 2
Component InThese connectors are
Mini plug type
LAN Headphone
P8800To Speakers
Wireless Remote
Headphone
HDMI
October 2010 LCD TV 42LE550053
To SpeakersP8200 To Front IR
-
October 2010 42LE5500 LCD-DV
42LE5500 Main Board (Front and Back Side) Component Layout42LE5500 Main Board (Front and Back Side) Component Layout
54
E
C
B A1
C
A2
Q D
(1) P-DIM Pin 20 can vary according to incoming video IRE level, OSD Backlight setting and then Intelligent Sensor (room light condition) Output from the Video Processor IC900. Range 0.69V to 3.3V.
SW8100Micro Reset
SW1000Video Reset
SW9300Tru-Motion
Reset
10MHz
Q?
D
G S
A-CA
C
MAIN BOARDp/n: EBU60904603
P8200
IC900Video Processor
LGE3549XQ
P8800
Q8200
Q8201
Q8700
IC8300
L8805L8804
HDMISelectIC8801
IC8800
IC8004Q8800
Micro
IC8101
SW1000
SW8100X8100
P
9
0
0
0
n
/
c
X900012Mhz
IC1000IC901
IC9001T-CON
LGE7378A
X930025Mhz
IC9300
SW9300
P7501 P7500
IC9100L9100
IC9102
L9102
L9101
IC9103
A-CA
C
D9101
D9102IC9302
L9301
IC8901IC8900 L8904
3
2 1
3
2 1
Q8004Q8005
Q8001
Q8003IC8008
IC8007
L8905IC8903IC8902
L8012IC8002 IC8001
IC8003
L8015
IC8005
P8000
L8010L8009
P9000Gamma
IC605IC603IC301
IC302
L8004 USB1
54MHz X1001
USB2
IC700
IC300Q300
TU700TDVJ-H031F
18. IF p17. IF n16. IF AGC15. Reset14. 3.3V13. 1.26V12. GND11. CVBS10. NC 9. SIF
8. NC 7. SDA 6. SCL 5. NC 4. NC 3. 5V
2. NC 1. NC
HP
HDMI
D8310
ComponentComposite
IC8000
Digital Video
Analog
Tuner B+
Tuner DataTuner Clock
Audio
A2 A1
C
LAN
X810132.768Khz
IC9301LG5111
Q901
IC602IC606IC604
Q702Q701
IC8200
IC8401
IC8400Q8304
Q8301
D8307 Q8303Q8300
Q8701IC8700
Q8205Q8203
Q8305Q8302
D8306
DSG
Q200
G
S
B
D
Q8308
D8312
IC8100
IC9000
IC9303IC9101
Q8000 Q80021
23
D8309
P8200 Connector "MAIN Board" To CON1 "IR Board"
Pin Label STBY Run Diode Check1 SCL 3.56V 3.5V Open2 SDA 3.56V 3.5V Open3 Gnd Gnd Gnd Gnd4 KEY 1 3.32V 3.3V 1.9V5 KEY 2 3.29V 3.3V 1.9V6 3.5V_ST 3.56V 3.47V 1.24V7 Gnd Gnd Gnd Gnd8 LED_LOGO 0V 0V Open9 IR 1.63V 1.6V Open10 Gnd Gnd Gnd Gnd11 +3.3V_Normal 0V 3.34V 0.52V12 LED_R/BUZZ 0V 0V Open
P8000 "MAIN Board" Connector To P201 "SMPS Board"
Pin Label STBY Run Diode Check1 PWR-ON 0V 3.36V Open
2-4 20V 0V 21.27V Open
5-8 Gnd Gnd Gnd Gnd
9-12 3.5V 3.57V 3.5V 1.24V
13-15 Gnd Gnd Gnd Gnd
16 V-SYNC 0V 0.02V 1.06V
17 12V 0V 11.43V Open
18 INV-ON 0V 3.28V 1.62V
19 12V 0V 11.43V Open
20 SCLK 0V 0.09V 1.06V
21 12V 0V 11.43V Open
22 P-DIM 0V 0.38V~3.3V Open
23 L-DIM (SIN) 0V 3.3V 1.05V
24 ERROR 0V 0V Gnd
10.62VEach Pin
3.3V_NormalRL_ON
Panel _CTL
Panel _DC-DC
VDD_7.8V
INV_ON
3.3V_MEMC1.26V_MEMC
1.5V_MEMC
5V_Normal
D1.2V & A1.2V
5V_USB 5V_USB2
5V_USB1
+1.26V_TU
DDR_VTT
1.8V_AMP
1.8V_L/Dimming
A2.5V
Power Det
R- R+ L- L+
-
October 2010 42LE5500 LCD-DV
42LE5500 Main Board (Front) Component Layout42LE5500 Main Board (Front) Component Layout
55
E
C
B A1
C
A2
Q D
SW9300Tru-Motion
Reset
SW8100Microprocessor
Reset
SW1000Videoprocessor
Reset
D
G S
A-CA
C
MAIN BOARDp/n: EBU60904603
Q?
P8200
IC900Video Processor
LGE3549XQ
P8800
Q8200
Q8201
Q8700
IC8300L8805L8804
HDMISelectIC8801
IC8800
IC8004Q8800Micro
IC8101 SW1000
SW8100X8100
P9000Update
X900012Mhz
IC1000
IC901
IC9001T-CON
LG7378A
IC9301LG5111RX/TX
X930025Mhz
IC9300
SW9300
P7501 P7500
IC9100L9100
IC9102
L9102
L9101
IC9103
A-CA
C
D9101
D9102IC9302
L9301
IC8901IC8900 L8904
3
2 1
3
2 1
Q8004Q8005
Q8001
Q8003
IC8008
IC8007
L8905IC8903IC8902
L8012IC8002 IC8001
IC8003
L8015
IC8005
P8000
L8010L8009
P9000Gamma
IC605IC603IC301
IC302
L8004 USB1
54MHz X1001
USB2
IC700
IC300Q300
TU700TDVJ-H031F
18. IF p17. IF n16. IF AGC15. Reset14. 3.3V13. 1.26V12. GND11. CVBS10. NC 9. SIF
8. NC 7. SDA 6. SCL 5. NC 4. NC 3. 5V
2. NC 1. NC
HP
HDMI
D8310
ComponentComposite
IC8000
Digital Video
Analog Video
Tuner B+
Tuner DataTuner Clock
Audio
A2 A1
C
R- R+ L- L+
-
42LE5500 Main (Front Side) Component Voltages
IC300 Earphone Amp IC700 (+1.26V_TU) IC8002 (D1.8V) IC8005 (+3.3V_NORMAL) IC8902 (+1.26V_MEMC) IC9102 DC to DCPin Pin Regulator Pin Regulator Pin Regulator Pin Regulator Pin HVDD T-CON[1] 0V [1] 0V (Gnd) [1] 5V [1] 0V (Gnd) [1] 0V (Gnd) [1] 0V (Gnd)[2] 0V [2] 1.26V (Out) [2] 3.34V (In) [2] 11.8V (In) [2] 11.8V (In) [2] 11.72V (In)[3] 0V [3] 3.3V (In) [3] 1.8V (Out) [3] 0V (Gnd) [3] 0V (Gnd) [3] 11.72V (In)[4] 0V [4] Gnd [4] 0.8V [4] 0.8V [4] 3.25V[5] 0V IC1000 SOC Reset [5] Gnd [5] 0.86V [5] 0.7V [5] 3.2V[6] 3.3V Pin Generator [6] 0.9V [6] 3.36V (PWR On/Off2 Ctl) [6] 3.36V (PWR On/Off2 Ctl) [6] 0V[7] 3.3V [1] 3.32V (In) [7] 0.9V [7] 3.36V (Out) [7] 1.3V (Out) [7] 0V
[8] (-1.8V) [2] 0V (Gnd) [8] 1V [8] 3.36V (Out) [8] 1.3V (Out) [8] 11.7V[9] (-0.8V) [3] 3.3V (Out) [9] 2.38V [9] 0V (Gnd)
[10] Gnd [10] 3.36V (PWR On/Off1 Ctl) IC8007 Power Det Gen IC8903 (+3.3V_MEMC) [10] 1.13V[11] 0.9V IC8000 5V Regulator Pin (+12V and +3.5V) Pin Regulator [11] 0V (Gnd)[12] 1.8V Pin for USB IC8003 (+5V_NORMAL) [1] 0V (Gnd) [1] 0V (Gnd) [12] 0V (Gnd)[13] 3.3V [1] 11.79V (In) Pin Regulator [2] 3.6V (In) [2] 11.8V (In) [13] 0V (Gnd)[14] 3.3V [2] 5V (Out) [1] 0V (Gnd) [3] 3.5V (Out) [3] 0V (Gnd) [14] 7.7V[15] Gnd [3] 5V (Out) [2] 11.8V (In) [4] 0.8V [15] 7.7V (HVDD)[16] 0V [4] 10.5V [3] 0V (Gnd) IC8008 Power Det Gen [5] 0.8V [16] 0V (Gnd)
[5] 3.3V [4] 0.8V Pin (+24V) [6] 3.36V (PWR On/Off2 Ctl)IC301 Switched [6] 0.8V [5] 0.86V [1] 0V (Gnd) [7] 3.3V (Out) IC9300 Reset for
Pin 5V for USB 2 [7] 4.99V [6] 3.37V (PWR On/Off2 Ctl) [2] 3.6V (In) [8] 3.3V (Out) Pin LG5111[1] Gnd [8] 0V (Gnd) [7] 5V (In) [3] 3.7V (Out) [1] 3.32V (In)[2] 5V (In) [8] 5V (In) IC9100 P-GAMMA [2] 0V (Gnd)[3] 5V IC8001 D1.2V and A1.2V IC8800 (+1.8V_AMP) Pin Chip [3] 3.34V (Out)[4] 3.3V Pin Regulator IC8004 A2.5V Regulator Pin Regulator [1] 3.3V[5] 3.3V [1] 0V (Gnd) Pin for USB [1] 0V (Gnd) [2] 0V (Gnd) IC9302 (1.8V_L/Dimming)[6] 5V (Out) [2] 3.3V [1] n/c [2] 1.8V (Out) [3] 3.3V (In) Pin Regulator[7] 5V (Out) [3] 0V (Gnd) [2] 3.26V (In) [3] 3.295V (In) [4] 0V (Gnd) [1] 0V (Gnd)
[8] n/c [4] 1.2V [3] 3.26V (In) [5] 6.8V [2] 11.8V (In)[5] 3.3V [4] n/c IC8901 (+1.5V_MEMC) [6] 6.8V [3] 0V (Gnd)
IC302 Switched [6] n/c [5] n/c Pin Regulator [7] 15.3V [4] 0.8VPin 5V for USB 1 [7] 4.46V [6] 2.55V (Out) [1] 0V (Gnd) [8] 15.3V [5] 0.76V[1] Gnd [8] 3.3V [7] 0.8V [2] 1.5V (Out) [9] n/c [6] 3.34V (PWR On/Off2 Ctl)( ) ( )[2] 5V (In) [9] 3.3V [8] 0V (Gnd) [3] 3.3V (In) [10] 13.47V [7] 1.8V (In)[3] 5V [10] 3.3V [11] 12.75V [8] 1.8V (In)[4] 3.3V [11] 1.2V Q8005 INV_ON Q8306 HDMI [12] 11.8V[5] 3.3V [12] Gnd Pin Driver Pin Det [13] 10V D9101 VGH/VDD[6] 5V (Out) [13] 3.3V B 0V (INV ON) En B 0V [14] 5.96V Pin Rectifyer[7] 5V (Out) [14] 0.8V C 3.1V (Out) C 3.3V [15] 4.06V A 15.4V
[8] n/c E Gnd E Gnd [16] 15.3V AC 22.2V[17] 0V C 27.4V (VGH)
Q300 Earphone Mute Q8003 PANEL_VCC Q8200 IR Buffer Q8307 HDMI [18] 2.96VPin L Out Pin Control 2nd Driver Pin 2nd Pin Det [19] 2.33V D9102 VGL/VCC
B 0V B 0.679V B 0.02V B 0V [20] 3.3V (In) Pin RectifyerC 3.3V C 0V C 3.4V C 4.18V A (-5V VGL)E Gnd E Gnd E Gnd E Gnd AC (-1.9V)
C 0VQ8001 PANEL_VCC Q8004 PANEL_VCC Q8201 IR Buffer Q8700 Wireless PWR Q8800 AMP_MUTE
Pin Control 1st Driver Pin Switch Pin 1st Dongle Out Turns on Q8701 Pin Pin 25 IC8801B 0V S 11.8V (In) B 0V B 0.66V (0.0V Dongle In) B 0VC 0.68V G 1.8V (Enable) C 3.3V C 0.14V (24V Dongle In) C 3.336VE Gnd D 11.8V (Out) E Gnd E Gnd E Gnd
56 October 2010 42LE5500 LCD-DV
-
October 2010 42LE5500 LCD-DV
42LE5500 Main (Back Side) Layout42LE5500 Main (Back Side) Layout
57
E
C
B A1
C
A2
Q D
MAIN BOARDp/n: EBU60904603
Q901
IC602IC606 IC604
18. IF p17. IF n16. IF AGC15. Reset14. 3.3V13. 1.26V12. GND11. CVBS10. NC 9. SIF
8. NC 7. SDA 6. SCL 5. NC 4. NC 3. 5V
2. NC 1. NC
Digital Video
Analog Video
Tuner B+
Tuner DataTuner Clock
Audio
TU700TDVJ-H031F
Q702
Q701
Rubber
IC8200
IC8401
IC8400Q8304
Q8301D8307
Q8303 Q8300D8309
Q8701IC8700
Q8205
Q8203
Q8305 Q8302D8306
R
u
b
b
e
r
D
S
G
Q200
G
S
B
D
Q8308
D8312
IC8100
IC9000
IC9003
IC9001
Rubber
Rubber
Q8000
Q80021
23
-
42LE5500 Main (Back Side) Component Voltages
IC602 D1.8V IC8400 RGB IC8700 Wireless Q200 (1.8V_HDMI) Q8203 IR Wireless PassPin Regulator Pin H/V Sync Pin Buffer Pin Switch Pin 2nd Driver[1] 0V (Gnd) [1] 1.9V [1] 0V (3.3V Dongle In) S 1.83V (Out) B 0V[2] 3.29V (PWR On/Off1 Ctl) [2] 1.9V [2] 3.3V (0.3V Dongle In) G 3.35V (PWR On/Off2 Ctl) C 3.3V[3] 0.9V (DDR_VTT) [3] 4.4V [3] n/c D 1.83V (In) E Gnd[4] 0.93V [4] 0V [4] n/c[5] 1.83V [5] 0.9V [5] n/c Q701 Tuner SIF[6] 3.38V (In) [6] n/c (4.5V) [6] Gnd Pin (Sound) Buffer Q8205 IR Wireless Pass[7] 1.8V (Out) [7] 0V (Gnd) [7] Gnd B 0.16V Pin 1st Driver[8] 0.91V (DDR_VTT) [8] n/c (4.5V) [8] Gnd C Gnd B 0.6V
[9] n/c (1.9V) [9] n/c E 0.83V C 0VIC8100 EEPROM [10] n/c (1.9V) [10] 0.02V E Gnd
Pin Micro [11] n/c (4.5V) [11] 0V Q702 Tuner Video[1] 0V (Gnd) [12] 0.9V [12] 3.3V Pin (Analog) Buffer Q8300, 2 HDMI 2[2] 0V (Gnd) [13] 0.9V [13] 0V (3.3V Dongle In) B 2.05V Pin Det[3] 0V (Gnd) [14] 5V [14] 3.3V C 2.75V B 4.2V[4] 0V (Gnd) [15] 3.3V E Gnd C 0V[5] 3.37V IC8401 EDID Data [16] 3.3V E Gnd[6] 3.37V Pin PC Q901 FLASH_WP[7] 0V (Gnd) [1] 0V (Gnd) IC9303 EEPROM Pin for IC901 Q8303, 4, 5 HDMI 3[8] 3.37V [2] 0V (Gnd) Pin for LG5111 B 0V (Flash_WP) Pin Det
[3] 0V (Gnd) [1] 0V (Gnd) C 3.36V B 0VIC8200 RS232 [4] 0V (Gnd) [2] 0V (Gnd) E Gnd C 4.2V
Pin Routing [5] 0.7V [3] 0V (Gnd) E Gnd[1] 0V [6] 4.1V [4] 0V (Gnd) Q8000 RL_ON (PWR_On)[2] 0V [7] 4.5V [5] 3.37V Pin 1st Driver Q8308 CEC Remote[3] 0V [8] 4 5V (In) [6] 3 37V B 0 66V Pin HDMI CEC[3] 0V [8] 4.5V (In) [6] 3.37V B 0.66V Pin HDMI CEC[4] 0V [7] 3.34V C 0V [B] 2.72V[5] 0V IC9000 Serial Flash [8] 3.37V (In) E Gnd [G] 2.73V[6] (-5.47V) Pin T-CON [S] 3.27V[7] n/c (5.59V) [1] 0.06V Q8002 PWR_ON [D] 3.37V [8] n/c (0V) [2] 0.67V D8306, 7, 9 5V Pull Up Routing Pin Switch[9] n/c (3.3V) [3] 3.3V (In) Pin HDMI SCL/SDA [1] 3.36V (In) Q8701 IR Wireless Pass
[10] n/c (0.2V) [4] 0V (Gnd) A1 5.04V [2] 0V Pin 2nd Driver[11] n/c (3.3V) [5] 0V C 4.58V [3] 3.3V (Out) G 24.5V (2.3V Dongle I[12] 3.35V [6] 0.34V A2 0V S 24V[13] 0V [7] 3.31V (In) D 0V (24.5V Dongle In)[14] (-5.47V) [8] 3.34V (In) D8312 3.5V Pull Up[15] 0V (Gnd) Pin HDMI CEC[16] 3.37V A1 0V
C 3.26VA2 3.2V
58 October 2010 42LE5500 LCD-DV
-
Main Board X9001 and X9000 Crystal ChecksMain Board X9001 and X9000 Crystal Checks
X9001 IC9001 T-CON Crystal X9000IC9301 TruMotion / Di i C t l1.58V
3.19V p/p
IC9001 T CON Crystal
1.56V2.54V p/pDimming Crystal
1.6V4.86V p/p
1.6V3 27V p/p
Runs when set is On
25Mhz
3.27V p/p12Mhz
Runs when set is On
X9001
X9000
MAIN Board
October 2010 LCD TV 42LE550059
-
Main Board X8100 , X8101 and X1001 Crystal ChecksMain Board X8100 , X8101 and X1001 Crystal Checks
X8100 IC900 BCM Crystal X1001IC8100 Micro Crystal
1.95V3.13V p/p
1.52V781mV p/pEither leg Either leg
1.522.26V p/p
1.3V789mV p/p10Mhz 54MhzEither leg
Runs allThe time
Runs when set is On
MAIN BoardX8100
1.85V p/p 2.82V p/pX8100
X1001X8101
1.75V1.5V Runs allThe time
October 2010 LCD TV 42LE550060
The time
X8101
-
Main Board DC to DC Converter (Voltages for Panel) ChecksMain Board DC to DC Converter (Voltages for Panel) Checks
Location: Top Center of Board
+7.81VHVDD
IC9102
L9100
+16V
IC9102
L9104
Panel 12V
D9101
16VVDD B+ for
IC9102IC9103
L9102
+27VVGH
D9101
Panel 12V
IC9103
-5VVGL
+3.3VVCC
L9101
October 2010 LCD TV 42LE550061
D9102
-
Main Board Additional Panel Voltage ChecksMain Board Additional Panel Voltage Checks
Location: Top Left of Board
P7500P7501
IC9101IC9101Back Side of Board
-4.8V (VDD-ODD)
From IC9101 Pin 21
From IC9101 Pin 19
-4.7V (VST)
From IC9101 Pin 20
From IC9101 Pin 19
October 2010 LCD TV 42LE550062
-4.8V (VDD-EVEN)
-
Main Board Connector P8000 to Power Supply Voltage and Diode CheckMain Board Connector P8000 to Power Supply Voltage and Diode Check
P8000 Main Board" to P201 SMPS"P8000Pin Label STBY Run Diode Check
1 PWR-ON 0V 3.36V Open
2-4 20V 0V 21.27V Open
5-8 Gnd Gnd Gnd Gnd
Odd Pins Front Row 9-12 3.5V 3.57V 3.5V 1.24V13-15 Gnd Gnd Gnd Gnd
16 V-SYNC 0V 0.02V 1.06V
17 12V 0V 11 43V ODiode Mode values taken with all Connectors Removed
17 12V 0V 11.43V Open
18 INV-ON 0V 3.28V 1.62V
19 12V 0V 11.43V Open
20 SCLK 0V 0.09V 1.06V
21 12V 0V 11.43V Open
22 P-DIM 0V 0.38V~3.3V Open
23 L-DIM (SIN) 0V 3.3V 1.05V
24 ERROR Gnd Gnd Gnd
(1) PDIM Pin 22 can vary according to incoming video IRE level, OSD Backlight setting and Intelligent Sensor (room light condition). R 0 37V t 3 3V
24 ERROR Gnd Gnd Gnd
P-DIM13.66V p/p 50IRE
October 2010 LCD TV 42LE550063
Range 0.37V to 3.3V.
-
Main Board Connector P7500 to the Panel Voltage and Diode CheckMain Board Connector P7500 to the Panel Voltage and Diode CheckThere are no Stand-By Voltages for the ConnectorDiode Mode values taken with all Connectors RemovedP7500 Connector Main" to the Panel
Pin Label Run Diode Check
1 Gnd Gnd Gnd
2 GMA1 14.91V Open
3 GMA3 13 5V Open
Pin Label Run Diode Check
21 LV0+ 1.06V 0.9V
22 LV0- 1.27V 1.09V
23 LV1+ 1 4V 0 9V
Pin Label Run Diode Check
41 VDD 15.57V Open
42 VDD 15.57V Open
43 Gnd Gnd Gnd3 GMA3 13.5V Open
4 GMA4 12.78V Open
5 GMA6 11.88V Open
6 GMA7 10.02V Open
7 GMA9 8 02V Open
23 LV1+ 1.4V 0.9V
24 LV1- 1.3V 1.09V
25 LV2+ 1.03V 0.9V
26 LV2- 1.3V 1.09V
27 LVCLK+ 1 16V 0 9V
43 Gnd Gnd Gnd
44 VCOM_IN 6.86V Open
45 VCOM_FB 6.87V Open
46 Gnd Gnd Gnd
47 VST ( 4 7V) 1 5V7 GMA9 8.02V Open
8 GMA10 7.48V Open
9 GMA12 5.99V Open
10 GMA13 4.08V Open
11 GMA15 2 98V Open
27 LVCLK+ 1.16V 0.9V
28 LVCLK- 1.17V 1.09V
29 LV3+ 1.07V 0.9V
30 LV3- 1.27V 1.09V
31 LV4+ 1 02V 0 9V
47 VST (-4.7V) 1.5V
48 VGL (-5V) 0.6V
49 VDD_EVEN (-4.8V) 1.5V
50 VDD_ODD (-4.8V) 1.5V
51 VGI P (VGL) ( 5V) 0 6V11 GMA15 2.98V Open
12 GMA16 2.35V Open
13 GMA18 1.06V Open
14 Gnd Gnd Gnd
15 OPT N 1 06V 2 06V
31 LV4+ 1.02V 0.9V
32 LV4- 1.3V 1.09V
33 LV5+ 1.02V 0.9V
34 LV5- 1.3V 1.09V
35 Gnd Gnd Gnd
51 VGI_P (VGL) (-5V) 0.6V
52 VGI_N (VGH) 27.4V Open
53 CLK6 8V 1.5V
54 CLK5 8V 1.5V
55 CLK4 8V 1 5V15 OPT_N 1.06V 2.06V
16 H_CONV 1.07V Gnd
17 VST_IN 0V 1.06V
18 POL 0.62V 1.06V
19 SOE 0 3V 1 06V
35 Gnd Gnd Gnd
36 VCC 3.3V 1.64V
37 VCC 3.3V 1.64V
38 Gnd Gnd Gnd
39 HVDD 7 81V Open
55 CLK4 8V 1.5V
56 CLK3 8V 1.5V
57 CLK2 8V 1.5V
58 CLK1 8V 1.5V
59 Z OUT 7 7V Open
October 2010 LCD TV 42LE550064
19 SOE 0.3V 1.06V
20 Gnd Gnd Gnd
39 HVDD 7.81V Open
40 HVDD 7.81V Open
59 Z_OUT 7.7V Open
60 Gnd Gnd Gnd
-
Main Board Connector P7501 to the Panel Voltage and Diode CheckMain Board Connector P7501 to the Panel Voltage and Diode CheckThere are no Stand-By Voltages for the ConnectorDiode Mode values taken with all Connectors RemovedP7501 Connector Main" to the Panel
Pin Label Run Diode Check
1 Gnd Gnd Gnd
2 Z_OUT 7.7V Open
3 CLK1 8V 1 5V
Pin Label Run Diode Check
21 HVDD 7.81V Open
22 HVDD 7.81V Open
23 Gnd Gnd Gnd
Pin Label Run Diode Check
41 Gnd Gnd Gnd
42 SOE 0.3V 1.06V
43 POL 0 62V 1 06V3 CLK1 8V 1.5V
4 CLK2 8V 1.5V
5 CLK3 8V 1.5V
6 CLK4 8V 1.5V
7 CLK5 8V 1 5V
23 Gnd Gnd Gnd
24 VCC 3.3V 1.64V
25 VCC 3.3V 1.64V
26 Gnd Gnd Gnd
27 RV0+ 1 07V 1 09V
43 POL 0.62V 1.06V
44 VST_IN 0V 1.06V
45 H_CONV 1.07V Gnd
46 OPT_N 1.06V 2.06V
47 Gnd Gnd Gnd7 CLK5 8V 1.5V
8 CLK6 8V 1.5V
9 VGH 27.4V Open
10 VGH (-5V) 0.6V
11 VGH ODD (-4 8V) 1 5V
27 RV0+ 1.07V 1.09V
28 RV0- 1.12V 0.9V
29 RV1+ 1.13V 1.09V
30 RV1- 1.23V 0.9V
31 RV2+ 1 13V 1 09V
47 Gnd Gnd Gnd
48 GMA18 1.06V Open
49 GMA16 2.35V Open
50 GMA15 2.98V Open
51 GMA13 4 08V Open11 VGH_ODD (-4.8V) 1.5V
12 VGH_EVEN (-4.8V) 1.5V
13 VGL (-5V) 0.6V
14 VST (-4.7V) 1.5V
15 Gnd Gnd Gnd
31 RV2+ 1.13V 1.09V
32 RV2- 1.22V 0.9V
33 RVCLK+ 1.17V 1.09V
34 RVCLK- 1.18V 0.9V
35 RV3+ 1 08V 1 09V
51 GMA13 4.08V Open
52 GMA12 5.99V Open
53 GMA10 7.48V Open
54 GMA9 8.02V Open
55 GMA7 10 02V Open15 Gnd Gnd Gnd
16 VCOM_FB 6.87V Open
17 VCOM_IN 6.86V Open
18 Gnd Gnd Gnd
19 VDD 15 57V Open
35 RV3+ 1.08V 1.09V
36 RV3- 1.27V 0.9V
37 RV4+ 1.12V 1.09V
38 RV4- 1.22V 0.9V
39 RV5+ 1 13V 1 09V
55 GMA7 10.02V Open
56 GMA6 11.88V Open
57 GMA4 12.79V Open
58 GMA3 13.5V Open
59 GMA1 14 91V Open
October 2010 LCD TV 42LE550065
19 VDD 15.57V Open
20 VDD 15.57V Open
39 RV5+ 1.13V 1.09V
40 RV5- 1.22V 0.9V
59 GMA1 14.91V Open
60 Gnd Gnd Gnd
-
Main Board P8200 to (Ft. IR/Intelligent Sensor) Voltage and Diode CheckMain Board P8200 to (Ft. IR/Intelligent Sensor) Voltage and Diode Check
P8200 Connector "MAIN Board" To P100 "IR Board" P8200 1
Pin Label STBY Run Diode Check1 (1) SCL 3.56V 3.5V Open2 (1) SDA 3.56V 3.5V Open3 Gnd Gnd Gnd Gnd4 KEY 1 3.32V 3.3V 1.9V5 KEY 2 3.29V 3.3V 1.9V6 3.5V_ST 3.56V 3.47V 1.24V7 Gnd Gnd Gnd Gnd8 LED_LOGO 0V 0V Open9 (2) IR 1 63V 1 6V O9 (2) IR 1.63V 1.6V Open
10 Gnd Gnd Gnd Gnd11 +3.3V_Normal 0V 3.34V 0.52V12 LED R/BUZZ 0V 0V Open12 LED_R/BUZZ 0V 0V Open
(1) Clock pulses only present when Intelligent Sensor is turned on. (3.7V p/p)(2) IR pulses (1.6V p/p)
October 2010 LCD TV 42LE550066
Diode Mode values taken with all Connectors Removed
-
Main Board Connector P8800 to Speakers Voltage and Diode CheckMain Board Connector P8800 to Speakers Voltage and Diode CheckQ8800
Amp MuteQ8800 (Mute) Active Low. Normal 3.3V Collector to Pin 25
IC8800Amp 1.8V
P8800 CONNECTOR "Main" to "Speakers"
Use speaker out to test for defective Audio Amp IC8801Note: (Normal, Audio B+) Mute
Pin 25
Pin LABEL SBY Run Diode Check1 SPK-R(-) 0V 10.62V Open2 SPK-R(+) 0V 10.62V Open3 SPK L( ) 0V 10 62V O
Audio B+21 3V
IC8801
3 SPK-L(-) 0V 10.62V Open4 SPK-L(+) 0V 10.62V Open
21.3VPins 49-52
(1)(1)
October 2010 LCD TV 42LE550067
Diode Mode values taken with all Connectors RemovedP8800
-
Main JK8700 Wireless Media Box Dongle Jack (Voltage and Diode Check)Main JK8700 Wireless Media Box Dongle Jack (Voltage and Diode Check)
Pin Label STBY Run Diode Check
JK8700 "MAIN Board" To "Wireless Media Box Dongle"
Wireless Media Box DonglePin Label STBY Run Diode Check1-6 *20.3V 0V 20.3V 0.98V
7 Detect 0V 0.3V 0.98V
8 Interrupt 0V 3.3V 1.2V JK8700J k
Wireless Media Box Dongle must be plugged in for
these voltages.
9 Gnd 0V Gnd Gnd
10 n/c 0V 3.3V 1.1V
11 Gnd 0V Gnd Gnd
12 I2C_SCL 0V 3.3V 1.02V
Jack
_
13 I2C_SDA 0V 3.3V 1.02V
14 Gnd 0V Gnd Gnd
15 Wireless_RX 0V 3.3V 1.17V
16 Wi l TX 0V 3 3V 1 22V
1
Diode Mode values taken with all Connectors
Removed
16 Wireless_TX 0V 3.3V 1.22V
17 Gnd 0V Gnd Gnd
18 IR 0.67V 3.3V 1.37V
19-20 Gnd 0V Gnd Gnd
Voltages with Wireless Media Box Dongle plugged in. Use Media Box Dongle side to read voltages. Remove cover, (see Wireless Media Box training manual for details).
*20.3V Switched from Q8701 Drain Back side of the board.Q8701 turned on by Q8700 front side of the board.
October 2010 LCD TV 42LE550068
Q8700 turned on by Microprocessor pin 38.
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FRONT (IR, INTELLIGENT SENSOR and MOVING LED) SECTIONFRONT (IR, INTELLIGENT SENSOR and MOVING LED) SECTION
The Intelligent Sensor and IR board (located on the bottom left as viewed from the rear) contains the IR (Infrared Remote Sensor) and the Intelligent Sensor. This board also connects with the Soft Touch Key Board and the Center LG Logo board. The Center LG Logo lights after power on and the picture appears. Then dims down in about 2 seconds. At power off, it does the reverse.
The IR board receives it operating B+ via CON1 pin 6 (STBY 3.5V).
The IR (Infrared) remote receiver can be measured (1.57V) at pin 9 of connector CON1 or P8200 on the Main board in Stand-By. During run pin 9 reads (1.54V).
The IR pulses (1.6V p/p) CON1 pin 9 are sent to P8200 on the Main board and on to theThe IR pulses (1.6V p/p) CON1 pin 9 are sent to P8200 on the Main board and on to the Microprocessor (IC8101) via pin 16.
The Intelligent Sensor communicates with the Micro/Video Processor IC900 BCM Chip via clock and data lines SCL1 and SDA1 arriving on connector CON1 from P8200 pins 1 and 2 on the Main board.
The Front Power LEDs are controlled by these same Clock and Data lines which communicate with the LED Driver IC U1 on the Soft Touch Key board.
The Key board is routed to the IR board via CON2 and output on CON1 Key 1 and Key 2 lines, y p y y ,(Key 1 pin 4 and Key 2 pin 5). Arriving at P8200 pins 4 and 5 on the Main Board. Then to the Microprocessor 25 and 26 lines.
October 2010 LCD TV 42LE550069
-
Front IR Board (Connections Identified)Front IR Board (Connections Identified)p/n EBR64966201
J2J2To Soft Touch
Key Board(1)
J3 To Center
Logo BoardLogo Board
J1To Main BoardIR and Intelligent
Sensor board
October 2010 LCD TV 42LE550070
-
Front Board Connectors CON1, CON2 and CON3 Voltage and Diode CheckFront Board Connectors CON1, CON2 and CON3 Voltage and Diode Check
J1 "Front IR" to P8200 " MAIN"J2 "Front IR" to Soft Touch Key Board"
Pin Label STBY Run Diode Check1 (1) SCL 3.56V 3.5V Open2 (1) SDA 3.56V 3.5V Open
Pin STBY Run Diode Check1 3.56V 3.47V Open2 0V 1.63V Open
J2 Front IR to Soft Touch Key Board
p
3 Gnd Gnd Gnd Gnd4 KEY 1 3.32V 3.3V 1.9V5 KEY 2 3.29V 3.3V 1.9V
2 0V 1.63V Open3 Gnd Gnd Gnd4 3.56V 3.5V Open5 3.56V 3.5V Open
6 3.5V_ST 3.56V 3.47V 1.24V7 Gnd Gnd Gnd Gnd8 LED_LOGO 0V 0V Open
6 Gnd Gnd Gnd7 3.32V 3.3V 1.9V8 3.29V 3.3V 1.9V
9 (2) IR 1.63V 1.6V Open10 Gnd Gnd Gnd Gnd11 +3.3V_Normal 0V 3.34V 0.52V12 LED R/BUZZ 0V 0V O
Pin STBY Run Diode Check
J3 "Front IR" to LG Logo Board"
12 LED_R/BUZZ 0V 0V Open 1 3.56V 3.47V 1.24V2 Gnd Gnd Gnd3 1.36V 0.6V Open4 G d G d G d
(1) Clock pulses only present when Intelligent Sensor is turned on. (3.7V p/p)
(2) IR pulses (1.6V p/p)
October 2010 LCD TV 42LE550071
Diode Mode values taken with all Connectors Removed 4 Gnd Gnd Gnd
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INVISIBLE SPEAKER SECTIONINVISIBLE SPEAKER SECTION
The 42LE5500 contains the Invisible Speaker system. The Full Range Speakers point downward, so there is no front viewable speaker grill or air ports.
Speakerp/n EAB60961501
g p p , p g p
Installed
Top View
Side View
Front View
October 2010 LCD TV 42LE550072
-
INTERCONNECT DIAGRAM (11 X 17 FOLDOUT SECTION)INTERCONNECT DIAGRAM (11 X 17 FOLDOUT SECTION)
This section shows the 11X17 foldouts. Use these pages as a single sheet Quick Reference page when working on this set. It list connectors and their voltages Also tricks and tips for easier troubleshootingtheir voltages. Also tricks and tips for easier troubleshooting.
The Adobe version of this Training Manual allows the viewer to zoom in and out making reading of the small text easier.
If ibl h i ti i t th f ll i I t t Di iIf possible, when printing, print the following Interconnect Diagram using 11X17 paper for easier viewing.
October 2010 LCD TV 42LE550073
-
Q?
D
G S
A-CA
C
MAIN BOARDp/n: EBU60904603
P8200
IC900Video Processor
LGE3549XQ
P8800
Q8200
Q8201
Q8700
IC8300
L8805L8804
HDMISelectIC8801
IC8800
IC9004Q8800
Micro
IC8101
SW1000
SW8100X8100
P
9
0
0
0
n
/
c
X900012Mhz
IC1000IC901
IC9001T-CON
LGE7378A
X930025Mhz
IC9300
SW9300
P7501 P7500 IC9100L9100
IC9102
L9102
L9101
IC9103
A-CA
C
D9101
D9102IC9302
L9301
IC8901IC8900 L8904
3
2 1
3
2 1
Q8004Q8005
Q8001
Q8003
IC8008
IC8007
L8905IC8903IC8902
L8012IC8002 IC8001
IC8003
L8015
IC8005P8000
L8010L8009
P9000Gamma
IC605IC603IC301
IC302
L8004 USB1
54MHz X1001
USB2
IC700
IC300Q300
TU700TDVJ-H031F
18. IF p17. IF n16. IF AGC15. Reset14. 3.3V13. 1.26V12. GND11. CVBS10. NC 9. SIF
8. NC 7. SDA 6. SCL 5. NC 4. NC 3. 5V
2. NC 1. NC
HP
HDMI
D8310
ComponentComposite
IC8000
Digital Video
Analog
Tuner B+
Tuner DataTuner Clock
Audio
A2 A1
C
LAN
X810132.768Khz
IC9301LG5111
42LE5500 INTERCONNECT DIAGRAM
Intelligent SensorIntelligent Sensor
Stand-by
P8200 "MAIN Board" To J1 "IR Board"
Indicates Hot Ground
SMPS TEST 1
P
2
0
1
A
PWR
ON
3 17 511 915 1319 17214 28 612 1016 1420 1822
2324
STBY 3.5V
12V12V
STBY 3.5V 20V20V
20V12V
INV-O
N B
SMPS TEST 2
P
2
0
1
A
PWR
ON
3 17 511 915 1319 17214 28 612 1016 1420 1822
2324
STBY 3.5V
12V12V
STBY 3.5V 20V20V
20V12V
Front pins on connectorare odd numbers.
Front pins on connectorare odd numbers.
To the Panel
Diode Check
9 IR 1.63V Open10 Gnd Gnd Gnd11 3.3V_Normal 0V 0.59V12 LED_BUZZ 0V Open
Pin Label STBY Run
1.6VGnd
3.34V0V
7 Gnd Gnd Gnd Gnd8 LED_LOGO 0V 0V Open
Pin Label STBY Run 1 SCL 3.56V 3.5V Open2 SDA 3.56V 3.5V Open3 Gnd Gnd Gnd Gnd4 Key1 3.32V 3.3V 1.9V5 Key2 3.29V 3.3V 1.9V6 3.5V_ST 3.56V 3.47V 1.24V
Diode Check
P8800 "Main" To "Speakers"Pin SBY Run Diode1 SPK-R(-) 0V 12.3V Open2 SPK-R(+) 0V 12.3V Open3 SPK-L(-) 0V 12.3V Open4 SPK-L(+) 0V 12.3V Open
Label
(1) PDIM Pin 22 can vary according to incoming video IRE level, OSD Backlight setting and then Intelligent Sensor (room light condition) Output from the Video Processor IC900. Range 0.37V to 3.3V.
Front IRIR ReceiverIntelligent
SensorJ1
Front Soft Switch Keys
J3J2
LG Logo
80 IRE32V p/p 120Hz
Note: If a particular area is exhibiting a dimmer backlight level than other areas or the overall brightness seems dim, be sure to first check the customers Menu setting for Backlights. Raise the percentage and see if the overall brightness returns to normal. If not, 1st: Check the P-DIM level, it should rise with the percentage shown on screen. 100%, 3.3V. Follow the P-DIM signal all the way to the Inverter. 2nd: Turn off Local Dimming in the Customers Menu. If the brightness returns to normal, examine the signals required for Local Dimming. (SIN, V-SYNC and SCLK).
Drive Signalsto LED Blocks
5 IRE32V p/p 120Hz
The Panel contains 12 LED Blocks To force a Block to turn on, simple ground the pin providing the 13V source is present.
SMPS TEST 1: To Force Power Supply On.Disconnect P8000 on Main board.(A) Jump pins 9, 10, 11 or 12 (3.5V) to pin 1. (Test Voltage Outputs 12V, 20V to Main and 120V to the Inverter). Remove AC power. Leave the jumper in place.
SMPS TEST 2: (B) Jump pins 9, 10, 11 or 12 (3.5V) to pin 18 (INV-ON). Apply AC power, the Backlights should turn on.
Note; If there is a problem with a load on the Inverter you canRemove AC and Disconnect P205 or P204. When AC is reapplied, the Backlight LEDs should turn on for about 4 seconds and then shut off.
J2 "IR Board" To "Soft Touch Key Board"Pin STBY Run Diode1 3.45V 3.36V Open2 0V 1.63V Open3 Gnd Gnd Gnd4 3.3V 3.3V Open
5 3.28V 3.28V Open6 Gnd Gnd Gnd7 3.45V 3.36V Open8 3.45V 3.36V Open
Pin STBY Run Diode
1 3.45V 3.0V 1.5V2 Gnd Gnd Gnd3 1.36V 0.64V Open4
Pin STBY Run Diode
J3 "IR Board" To "Center Logo Board"
Gnd Gnd Gnd
SW8100Micro Reset
SW1000Video Reset
SW9300Tru-
Motion Reset
SMPS BOARDp/n: EAY60803101
SK101AC In
2
1
u
F
/
4
5
0
V
2
1
u
F
/
4
5
0
V
2
1
u
F
/
4
5
0
V
2
1
u
F
/
4
5
0
V
2
1
u
F
/
4
5
0
V
16uF/450V
21uF/450V
16uF/450V
+
-
BD101
-
+
D206
IC501
IC502
IC503
Q511
F102 F1005A
250V
1A250V
F1031A
250V
F101
3.15A250V
D601 Q602
L601 L602
D201
D202
D203
D204
P201
P205
P204
R149
RL101
RL102
Q602
IC104IC105
Q207 Inverter
Q203
T102
D601
R149
T501
T101
C EB
CEB
CEB
CE B
Components Inside
Dashed Lineare Hot Ground
F101-F103 Hot GndStby 7.6VRun 396V
120V
LED Power
To the Panel
SCLK Pin 20 P2013.76V p/p
V-SYNC Pin 16 P2013.64V p/p
S-CLK Pin 23 P2013.25V p/p
Local Dimming On
S-CLK Pin 23 P2013.25V p/p
Local Dimming Off
P8000P201 "SMPS" To P8000 "MAIN Board"
Diode
Open
Gnd
1.05V
Open
Open
1.06V
Open
1.62V
Open
1.06V
Gnd
1.24V
Open
Open
Pin Label STBY Run Diode Check24 ERROR 0V 0V 1.45V
23 L-DIM (SIN) 0V 3.3V Open
22 P-DIM 0V 0.38V~3.3V Open
21 12V 0V 11.43V 0.178V
20 SCLK 0V 0.09V Open
19 12V 0V 11.43V 0.178V
18 INV-ON 0V 3.28V Open
17 12V 0V 11.43V 0.178V
16 V-SYNC 0V 0.02V Open
13-15 Gnd Gnd Gnd Gnd
9-12 3.5V 3.57V 3.5V Open
5-8 Gnd Gnd Gnd Gnd
2-4 20V 0V 21.27V 1.10V
1 PWR-ON 0V 3.36V 1.02V
Pin Label STBY Run Diode Check12 02.A 0V 117.8V Open
11 n/c n/c n/c Open
10 02-1C 0V 1V~30V Open
9 02-2C 0V 1V~30V Open
8 02-3C 0V 1V~30V Open
7-6 n/c n/c n/c Open
5 01-3C 0V 1V~30V Open
4 01-2C 0V 1V~30V Open
3 02-1C 0V 1V~30V Open
2 n/c n/c 0V Open
1 01.A 0V 117.8V Open
P204 "SMPS" To The Panel"
Pin Label STBY Run Diode Check12 04.A 0V 120V Open
11 n/c n/c n/c Open
10 04-1C 0V 1V~30V Open
9 04-2C 0V 1V~30V Open
8 04-3C 0V 1V~30V Open
7-6 n/c n/c n/c Open
5 03-3C 0V 1V~30V Open
4 03-2C 0V 1V~30V Open
3 03-1C 0V 1V~30V Open
2 n/c n/c 0V Open
1 03.A 0V 120V Open
P205 "SMPS" To The Panel"
Q901
IC602IC606IC604
Q702Q701
IC8200
IC8401
IC8400Q8304
Q8301
D8307 Q8303Q8300
Q8701IC8700
Q8205Q8203
Q8305Q8302
D8306
DSG
Q200
G
S
B
D
Q8308
D8312
IC8100
IC9000
IC9303IC9101
Q8000 Q80021
2
3
D8309
E
B
C
E
B
C
E
B
C
E
B
C
E
B
C
E
B
C
E
B
C
E
B
C
E
BC
E
BC
E
BC
E
B
C
P204
P205
These drivers ground the LED blocks. (12 Total). If the 120V is present on Pins 1 and 12 of P204 and P205 you can ground these test points to turn on a block.
1V (100 IRE)30V (0 IRE)Gnd
Gnd
120V
120V
120V
120V
n/c
n/c
n/c
n/c
n/c
n/c
*1V~30V LED Drive
*1V~30V LED Drive
*1V~30V LED Drive
*1V~30V LED Drive
*White 100 IRE to Black 0 IRE
INVERTER SECTIONOF THE SMPS
To Speakers
See the Inverter Section Blow Up on the Right
To The Panel
Forcing onA Block of LEDs.
1 VDD-33 3.5V2 VLED-RANGE 0V3 Gnd Gnd4 +12VS 12.44VPin 17-19-21 P2015 Gnd Gnd6 +3.5VS 3.57VPin 9-12 P201
1 INV_ON 3.28VPin 18 P2012 Gnd Gnd3 Gnd Gnd4 SCLK 0.09VPin 20 P2015 FB_STR_VF 1V6 P-DM1 1.9VPin 22 P201
1 Error 0VPin 24 P2012 (L-DIM) SIN 3.3VPin 23 P2013 POWER_ON 3.35VPin 1 P2014 VSYNC_IN 0VPin 16 P2015 Gnd Gnd6 Gnd Gnd
You can also these each of the 12 blocks functionality by grounding the driver output signals. See Forcing on a Block of LEDs on the right.
-
42LE5500 MAIN (FRONT SIDE) SIMICONDUCTORS
IC700 (+1.26V_TU) IC8002 (D1.8V) IC8005 (+3.3V_NORMAL) IC8902 (+1.26V_MEMC) IC9102 DC to DC Q8003 PANEL_VCC Q8700 Wireless PWRPin Regulator Pin Regulator Pin Regulator Pin Regulator Pin HVDD T-CON Pin Control 2nd Driver Dongle Out Turns on Q8701[1] 0V (Gnd) [1] 5V [1] 0V (Gnd) [1] 0V (Gnd) [1] 0V (Gnd) B 0.679V B 0.66V[2] 1.26V (Out) [2] 3.34V (In) [2] 11.8V (In) [2] 11.8V (In) [2] 11.72V (In) C 0V C 0.14V[3] 3.3V (In) [3] 1.8V (Out) [3] 0V (Gnd) [3] 0V (Gnd) [3] 11.72V (In) E Gnd E Gnd
[4] Gnd [4] 0.8V [4] 0.8V [4] 3.25VIC1000 SOC Reset [5] Gnd [5] 0.86V [5] 0.7V [5] 3.2V Q8004 PANEL_VCC Q8700 Wireless PWR
Pin Generator [6] 0.9V [6] 3.36V (PWR On/Off2 Ctl) [6] 3.36V (PWR On/Off2 Ctl) [6] 0V Pin Switch Dongle In Turns on Q8701[1] 3.32V (In) [7] 0.9V [7] 3.36V (Out) [7] 1.3V (Out) [7] 0V S 11.8V (In) B 0.0V[2] 0V (Gnd) [8] 1V [8] 3.36V (Out) [8] 1.3V (Out) [8] 11.7V G 1.8V (Enable) C 24V[3] 3.3V (Out) [9] 2.38V [9] 0V (Gnd) D 11.8V (Out) E Gnd
[10] 3.36V (PWR On/Off1 Ctl) IC8007 Power Det Gen IC8903 (+3.3V_MEMC) [10] 1.13VIC8000 5V Regulator Pin (+12V and +3.5V) Pin Regulator [11] 0V (Gnd) Q8005 INV_ON Q8800 AMP_MUTE
Pin for USB IC8003 (+5V_NORMAL) [1] 0V (Gnd) [1] 0V (Gnd) [12] 0V (Gnd) Pin Driver Pin Pin 25 IC8801[1] 11.79V (In) Pin Regulator [2] 3.6V (In) [2] 11.8V (In) [13] 0V (Gnd) B 0V (INV ON) En B 0V[2] 5V (Out) [1] 0V (Gnd) [3] 3.5V (Out) [3] 0V (Gnd) [14] 7.7V C 3.1V (Out) C 3.336V[3] 5V (Out) [2] 11.8V (In) [4] 0.8V [15] 7.7V (HVDD) E Gnd E Gnd[4] 10.5V [3] 0V (Gnd) IC8008 Power Det Gen [5] 0.8V [16] 0V (Gnd)[5] 3.3V [4] 0.8V Pin (+24V) [6] 3.36V (PWR On/Off2 Ctl) Q8200 IR Buffer D9101 VGH/VDD[6] 0.8V [5] 0.86V [1] 0V (Gnd) [7] 3.3V (Out) IC9300 Reset for Pin 2nd Pin Rectifyer[7] 4.99V [6] 3.37V (PWR On/Off2 Ctl) [2] 3.6V (In) [8] 3.3V (Out) Pin LG5111 B 0.02V A 15.4V
[8] 0V (Gnd) [7] 5V (In) [3] 3.7V (Out) [1] 3.32V (In) C 3.4V AC 22.2V [8] 5V (In) IC9100 P-GAMMA [2] 0V (Gnd) E Gnd C 27.4V (VGH)
IC8001 D1.2V and A1.2V IC8800 (+1.8V_AMP) Pin Chip [3] 3.34V (Out)Pin Regulator IC8004 A2.5V Regulator Pin Regulator [1] 3.3V Q8201 IR Buffer D9102 VGL/VCC[1] 0V (Gnd) Pin for USB [1] 0V (Gnd) [2] 0V (Gnd) IC9302 (1.8V_L/Dimming) Pin 1st Pin Rectifyer[2] 3.3V [1] n/c [2] 1.8V (Out) [3] 3.3V (In) Pin Regulator B 0V A (-5V VGL)[3] 0V (Gnd) [2] 3.26V (In) [3] 3.295V (In) [4] 0V (Gnd) [1] 0V (Gnd) C 3.3V AC (-1.9V)[4] 1.2V [3] 3.26V (In) [5] 6.8V [2] 11.8V (In) E Gnd C 0V[5] 3.3V [4] n/c IC8901 (+1.5V_MEMC) [6] 6.8V [3] 0V (Gnd)[6] n/c [5] n/c Pin Regulator [7] 15.3V [4] 0.8V Q8306 HDMI [7] 4.46V [6] 2.55V (Out) [1] 0V (Gnd) [8] 15.3V [5] 0.76V Pin Det
[8] 3.3V [7] 0.8V [2] 1.5V (Out) [9] n/c [6] 3.34V (PWR On/Off2 Ctl) B 0V[9] 3.3V [8] 0V (Gnd) [3] 3.3V (In) [10] 13.47V [7] 1.8V (In) C 3.3V
[10] 3.3V [11] 12.75V [8] 1.8V (In) E Gnd[11] 1.2V [12] 11.8V[12] Gnd [13] 10V Q8001 PANEL_VCC Q8307 HDMI [13] 3.3V [14] 5.96V Pin Control 1st Driver Pin Det[14] 0.8V [15] 4.06V B 0V B 0V
[16] 15.3V C 0.68V C 4.18V[17] 0V E Gnd E Gnd[18] 2.96V[19] 2.33V[20] 3.3V (In)
42LE5500 MAIN (BACK SIDE) SIMICONDUCTORS
IC602 D1.8V IC8200 RS232 IC8401 EDID Data IC9303 EEPROM Q8000 RL_ON (PWR_On) Q8303, 4, 5 HDMI 3Pin Regulator Pin Routing Pin PC Pin for LG5111 Pin 1st Driver Pin Det[1] 0V (Gnd) [1] 0V [1] 0V (Gnd) [1] 0V (Gnd) B 0.66V B 0V[2] 3.29V (PWR On/Off1 Ctl) [2] 0V [2] 0V (Gnd) [2] 0V (Gnd) C 0V C 4.2V[3] 0.9V (DDR_VTT) [3] 0V [3]