lg 29fu1rnx cw71a

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COLOR TV SERVICE MANUALCHASSIS : CW71A

MODEL: 29FU1RNX MODEL: 29FU1RNX-ZWCAUTIONBEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL33997507

Apr., 2007 Printed in China

CONTENTS

Contents ....................................................................................................2 Safety Precautions....................................................................................3 Control Descriptions ................................................................................4 Specifications............................................................................................7 Adjustment Instructions...........................................................................8 SVC Remocon .........................................................................................15 Trouble Shooting ....................................................................................16 Printed circuit board...............................................................................19 Block Diagram.........................................................................................22 Exploded View.........................................................................................24 Exploded View Parts List .......................................................................25 Replacement Parts List ..........................................................................26 SVC. Sheet...................................................................................................

-2-

SAFETY PRECAUTIONSIMPORTANT SAFETY NOTICEMany electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.

General GuidanceAn isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks. It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation. If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with the specified. When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor 10mm away from PCB. Keep wires away from high voltage or high temperature parts. Due to high vacuum and large surface area of picture tube, extreme care should be used in handling the Picture Tube. Do not lift the Picture tube by it's Neck.

Before returning the receiver to the customer,always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to be sure the set is safe to operate without damage of electrical shock.

Leakage Current Cold Check(Antenna Cold Check)With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on position, connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1M and 5.2M. When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer.

X-RAY RadiationWarning:The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and the Picture Tube. For continued X-RAY RADIATION protection, the replacement tube must be the same type tube as specified in the Replacement Parts List.

To determine the presence of high voltage, use an accurate high impedance HV meter. Adjust brightness, color, contrast controls to minimum. Measure the high voltage. The meter reading should indicate 23.5 1.5KV: 14-19 inch, 26 1.5KV: 19-21 inch, 29.0 1.5KV: 25-29 inch, 30.0 1.5KV: 32 inch If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure.

Leakage Current Hot Check (See below Figure) Plug the AC cord directly into the AC outlet. Do not use a line Isolation Transformer during this check. Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity. Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to 0.5mA. In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer. Leakage Current Hot Check circuit

AC Volt-meter

To Instruments exposed METALLIC PARTS

Good Earth Ground such as WATER PIPE, CONDUIT etc.0.15uF

1.5 Kohm/10W

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DESCRIPTION OF CONTROLS

All the functions can be controlled with the remote control handset. Some functions can also be adjusted with the buttons on the front panel of the set.

Remote control handsetPOWER

MUTE

Before you use the remote control handset, please install the batteries. See the next page. 12 1. POWER switches the set on from standby or off to standby. 2. NUMBER BUTTONS Switches the set on from standby or directly select a number. 13 3. ARC (Aspect Ratio Control) changes the picture format.

11 4 2 5 8 0PICTURE

3 6 9TV/AV MENU

27ARC

3SOUND

4T U R B O

OK

14 4. TURBO PICTURE / SOUND BUTTON (option) selects Turbo picture/sound. 5.D / E (Programme Up/Down) selects a programme or a menu item. switches the set on from standby. F / G (Volume Up/Down) adjusts the volume. adjusts menu settings. OK accepts your selection or displays the current mode.

5

PR VOL PR REW PLAY FF VOL

6FAVOURITESTOP REC

20I/II SSM SLEEP LISTEYE/

15

7 8 9 10 11

PSM MAIN STILL/TEXT

16 6. VCR BUTTONS (option) control a LG video cassette recorder. 17 18 7. I/II 19 selects the language during dual language broadcast.selects the sound output (option).i

INDEX/

Q.VIEW

MIX SIZE

TIME STILL

REVEAL ? MODE M UPDATE

10

8. PSM (Picture Status Memory) recalls your preferred picture setting. 9. SLEEPsets the sleep timer.

10. MAIN STILL/

freezes motion of the picture.

*

(With TELETEXT)

11. TELETEXT BUTTONS (option) These buttons are used for teletext. For further details, see the Teletext section. 12. MUTE switches the sound on or off. 13. TV/AV selects TV or AV mode. switches the set on from standby. -4-

14. MENUselects a menu.

15. LIST displays the programme table. 16. SSM (Sound Status Memory) recalls your preferred sound setting. 17. EYE/(option) switches the eye function on or off.

*

POWER

MUTE

11 4 2 5 8 0PICTURE

123 6 9TV/AV

18. Q.VIEW returns to the previously viewed programme. 19. INDEX/ (option) switches FRONT DISPLAY on or off.

*

27ARC

20. FAVOURITE selects a favourite programme.

3SOUND MENU

13 14T U R B O

* : No function COLOURED BUTTONS : These buttons are used for teletext (onlyTELETEXT models) or programme edit.

4OKPR

5

VOL PR REW PLAY

VOL

FF

6FAVOURITESTOP REC

20I/II SSM SLEEP LISTEYE/

15 16 17 18

7 8 9 10

PSM MAIN STILL/

Q.VIEW

(Without TELETEXT )

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29FU1 series

1. MAIN POWER (ON/OFF) switches the set on or off. 2. POWER/STANDBY INDICATOR illuminates brightly when the set is in standby mode. dims when the set is switched on.

1

2

3 3. MENU selects a menu. 4. OK accepts your selection or displays the current mode. F / G (Volume Down/Up) adjusts the volume. adjusts menu settings. D / E (Programme Up/Down) selects a programme or a menu item. switches the set on from standby. 5. REMOTE CONTROL SENSOR Note : Only use the supplied remote control handset. (When you use others, they will not be able to function.) 6. AUDIO/VIDEO IN SOCKETS (AV IN3) (option) Connect the audio/video out sockets of external equipment to these sockets. S-VIDEO/AUDIO IN SOCKETS (S-AV) Connect the video out socket of an S-VIDEO VCR to the S-VIDEO socket. Connect the audio out sockets of the S-VIDEO VCR to the audio sockets as in AV IN3 (option).7. TURBO SOUND / PICTURE (option) switches Turbo sound or Turbo picture function on or off.

4OK

5PR

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Note : Specification and others are subject to change without notice for improvement.

SPECIFICATIONS

Scope


This specification can be applied to all the Projection television related to CW71A Chassis.

Test Condition

Conduct the test as mentioned below. 1) Temperature: 25 5 (Except, CST 40 5 ) 2) Relative Humidity: 6510% 3) Power voltage : 220VAC 10% (50Hz/60Hz) 4) Use the parts only designated in B.O.M., PARTS SPEC., or drawings. 5) Follow each drawing or spec for spec and performance of parts, based upon P/N of B.O.M 6) Warm up TV set for more than 20min. before the measurement

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lg 29fu1rnx cw71a

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