curso tv plasma parte 3

7/30/2019 CURSO TV PLASMA PARTE 3

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Red & Green pin of left lower 4th FPCshort

Symptom Cause Countermeasure

Change X-Board

Check Point

Check Point

1. Check the contact status with connector(foreign material, soldering condition)2. Replace X Board and check again.(If OK, X-Board is defected)3. By tracing defected line, check the contact condition of FPC and other connectors, IC outputstage and PCB pattern.4. If no problem, check the connector lead board.


2/21

2/21


Re-insert the Connector Pattern Short by connector missinsert

Bottom Right 6th FPC R/BShort

Check Point

Check Point

1. Check the contact status with connector(foreign material, soldering condition)2. Replace X Board and check again.(If OK, X-Board is defected)3. By tracing defected line, check the contact condition of FPC and other connectors, IC outputstage and PCB pattern.4. If no problem, check the connector lead board.


3/21

3/21


SHORT

X-Board Tape Rework

ADD Electrode short at R,G,BRaster or White Screen(Different color display)

Check Point

Check Point

1. Trace defected line

2. Check the condition of FPC and connector on the X-Board, IC Output stage and Electrodeline.


4/214/21


Keep horizontal, or can be defected

OPENInterfere with mechanicalstructure when Moduleassembling

Cold soldering atConnector

Use Connector fixing iron plateKeep the contact point

horizontalwhen interfere with mechanical

parts

FPC connector Rework

1. Outbreak during heat run2. ADD Electrode open at one color Raster

or White screen(No discharge)

Check PointCheck Point

1. Trace defected line and check the condition of FPC and connector on X-Board, IC Outputstage and Electrode line.


5/215/21


Replace the Panel

Connected minutely and openslowly as time passes

ADD open


1. Replace X Board and check again(Still problem, change the Panel)2. Check the connection status of Panel side.3. Check the connection condition of connector of Panel side and the FPC at upper ACF.

If it is OK, check Panel pad


6/216/21

Symptom & Cause Countermeasure

Replace the Panel

1. Check the connection condition - Press the connector and reconnect2. Check the soldering condition of Connector lead3. Replace X Board and check again; Panel connector side or Circuit connector side

Board defect, in case of one line, check the output stage of Drive IC(Cold soldering/Pattern)If problems in input stage, several lines display

4. Observe the FPC

:X-board Board Board Driver IC / ()4. FPC :FPC * : panel open, ACF migration,, X-Board /Pattern,FPC


* The difference of ADD openand Short ?ADD open : Black vertical

bar at Raster ADD short : Different color

vertical bar atRaster


7/217/21


Change Control Board

1. Check the 5V(Logic voltage) input to DC-DCIf it is lower than 5V, it makes similar problem

2. Check X Board(Open or Short circuit)3. Check the connection condition(conncetion status, foreign material at connector, etc)4. Check the drive IC at X Board(If defected, change the Board)5. Confirm the connection of the connector



8/218/21


Change X-BOARD

Driver clock line at X Driver Board is designed to operate in A and B groupShort circuit at clock line of Drive ICIf problem at input stage, several lines are defected at one pointReplace the X Board of defected point



9/219/21

Countermeasur Symptom Cause

ChangeX Board

PCB pattern is connected minutelyForeign material when photo resisting


1. Check the connection condition of the Connector.2. Check the cold soldering.


10/21

10/21


Resistance between 186 pin of U3and 7 pin of U300 is 62Normal condition : 2

Because of foreign material in Viahole at U300 side Change Control Board

Vertical bar in every20mm


1. Measure the resistance of Via holes between U3 and U300 at Control Board and compare withthat of normal.(Normal : 2~3 )

2. Resistance increases as temperature rises.


11/21

11/21

CountermeasureSymptom Cause

- Open circuit between pin 7 of U200 and pin 7 of U7

- Resistance between two pinsvaries from

19 ohm ~ 45Kohm

Replace Control

Board


1. Observe the symptom during Heat-Run at 45 degree.

2. Check the resistance of VIA holes of suspect ICs


12/21

12/21

1. Because Control data on PROM(U40)doesnt download to FPGA, it cantgenerate control signal to X,Y and Z

Board.

2. Defected ALTERA.

Replace Control BoardReplace PROM


- When Power On, Fan operatesbut No OSD displays- LED(D3) of Control Boarddoesnt operate


1. Check D1, D3 & D4 on Control Board- D1 : ON with 5V- D3 : ON when PROM finishes program download from ALTERA chip- D4 : ON when signal is applied


13/21

13/21


Control Board

Replace Controller board

Touch point(Marked)No signal or at PC mode, dark redraster displays. This is darker thannormal Red signal.

Neighboring Pins of U1(FPGA)

touch


- TV VSC board- Board connector(50 pin) contact point- Control board of Module


14/21

14/21

Symptoms Cause Countermeasure

1. CN1 on Vs Board coldsoldering2. Spark marks between CN1and Vs Board -> It makesthem open

Replace DC-DC 2 board

Vs board1. No Raster(ST-BY LED On)2. Spark noise(Tik-Tik)3. No Vs, Vsetup & Vsc


1. Check Vs, Va with multimeter(No Vs output)2. Separate SMPS Board and VSC Board and check all voltage outputstage

3. Check FET, TR, Diode and Resistor(especially Cement Resistor)4. Observe PCB Pattern and soldering condition with naked eyes


15/21

15/21


1. PCB pattern of OVP circuit is wrong(In some SET)2. The discharging time of Vsetup is long,if Power On again within dischargingtime, this remaining voltage isconsidered as pulse and shut downcontrol circuit

Power toggles(On and Off)

Replace DC-DC2board

Defected SET : OVP Circuit


1. Power On/Off function doesnt work Initial Power On OK2. Power On : - Fan operates normally - No Vsetup & Vsc of Module3. Only Module operate : No Vs,Vsetup & Vsc


16/21

16/21

Definition of Cell Defect


17/21

17/21


18/21

18/21


19/21

19/21

Type

A & B zone : below then 50 mmDefectDistance

B zone (30%)(30%)A zone (70%)(70%)

Total 0 cellNonexting

uishing

N = 0Uncontrollable

N 3(cells/RGB scn)conjunction 2 cell 0

Dark+ Un

-stable


N 2(cells/RGB scn)Total N 6(cells/full

screen)

TotalDefect N 25 cells/full screen

Total 0 cellNon-

extinguishing

Total 5 cellUnstable

Uncontroll

able

N 5 cell / RGB scnDensity : 2cell/ for

each ColorDark

RemarksSpecificationType

Extinguished sizeis less than 50%.

N 6 cell / RGB scnDensity : 2cell/ for

each Color

ignited size is morethan 50%.


Type

A & B zone :below then 100(A)/50(B) mmDefect

Distance

B zone (75%)(75%)A zone (25%)(25%)

N 2(cells/RGB scn)

Nonextinguishing

Total 1cellUncontrollable

N 2(cells/RGB scn)conjunction 2 cell 0Dark


Total N

2(cells/fullscreen)conjunction 2 cell 1


Total 0 cell

Unstable N 4(cells/RGB scn)

Comparison of Specification(III)


20/21

20/21

Comparison of Specification(III)

60 PDP Panel

LG PDP panel has a tight specification of celldefect in comparison with other companiesproduct.

Pi_50

15Uncontrollable0

36LG_60

Dark/unstable

Non-extinguishing

NE_50

35Total

* SS : Normal cells 99.9% of total cells=> It means 3,140 defects will be O.K for 50

DefectDistance

Uncontrollable


Dark+ Un

-stable



screen)



screen)

Pi_50 Spec. of Cell Defect(01/4/25)

Total 0 cellNon-

extinguishing

Total cellUnstable

Uncontrollab

le

N cell / RGB scnDensity : 2cell/ for

each Color Dark

RemarksSpecificationType

extinguished sizeis less than 50%.

N cell / RGB scnDensity : 2cell/ for

each Color

ignited size is more

than 50%.


LGE 60 Spec. of Cell Defect (PDP60WVDN2)

Type

D50 mm, N 1 (D:Semidiameter)

B zone (30%)(30%) A zone (70%)(70%)

Nonextinguishing Total 0 cell

Type

A & B zone :below then 100(A)/50(B) mmDefect

Distance

B zone (%)(%) A zone (%)(%)

N (cells/RGB scn)

Nonextinguishing

Total cellUncontrollable

N (cells/RGB scn)conjunction cell 0Dark

NE_50 Spec. of Cell Defect (MV5501, 01/1/13)

N (cells/RGB scn)conjunction cell 1

Total N (cells/fullscreen)

conjunction 2 cell 1

TotalDefect N cells/full screen

Total 0 cell

Unstable N (cells/RGB scn)

C ll D f t S


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21/21

Cell Defect Spec.

1. Cell Defect Specification

Div. 40 42 60

Zone A - Zone B - Zone A - Zone B - Zone A Zone B Zone

Non ignition DotAnd

Unstable Dot

* N 2 [Cells / RGB scn]Total N 6

[Cells / full scn]* 2cell conjunction point :

N 0* include Unstable dot:

N 3

* N 4 [Cells / RGB scn]To tal N 12



N 6




N 4


[Cells / full scn]

* 2cell conjunction point : N 2

* 3cell conjunction point : N =0

* include Unstable dot: N 7


[Cells / full scn]





[Cells / full scn]




Uncontrollable Dot N=0 N 1 [Cells / RGB scn]Total N 3 [Cells / full scn]

N=0 N 2 [Cells / RGB scn]Total N 6 [Cells / full scn]

N 2 [Cells / RGB scn]Total N 6 [Cells / full scn]

N 3 [Cells / RGB scn]Total N 9 [Cells / full scn]

Non extinguishingDot N=0 N=0 N=0 N=0 N = 0 N = 0

Defect Distance 50mm 50mm D 5cm, N 1 (D:Semidiameter)

; however, include conjunctive cell, N = 0

Total Defect N 21 [Cells / full scn] N 25 [Cells / full scn] N 35[Cells / full scn]

Stain*1 D 5, N 3*D 5, N=0

* 1 D 5, N 3* D 5, N=0

* 1 D 5, N 3 ( Stain Distance : 50 mm)* D>5, N = 0 ( Stain Distance : 50 mm)

curso tv plasma parte 3

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