Guide de d%e9pannage Des TV Plasma LG

8/6/2019 Guide de d%e9pannage Des TV Plasma LG

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PDP One Point Repai r GuideDP One Poin t Repa ir Guide1.. 40 ~ 420 ~ 42 Inc h Prac t i c ench Prac t i ce2.. 60 Inch Prac t i ce0 Inc h Prac t i ce


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LG Electronics/DND QA Gr2/70

1. 40 ~ 42 Inch 42 Inch

P6

P4

Y-Board

cause : bad connection betweenY-Board

# 1, 2 drive board Connector pin

422 PDP Flicker andDP Flicker and No Raster Troubleshootingo Raster Troubleshooting Guideuide

Rework should

be done

Y-Driver Board


3/70


amplified amplified

: outside Leg

: inside Leg

P 6, P 4 both are the first pin, whenwiring, it should be done as picture

shown.

(bend the wire to Y-Driver B/D not

to Y-B/D . If not there can be noise)

Dont be confused with Pin number

Improved since Dec,2001.

P 4

P 6


4/70LG Electronics/DND QA Gr4/70

Be sure not to m isconnect the line.See the picture precisely and then connect jump wire at the exact point



Intermittent no-mage/image error while watchingX CAVBASX CANVAS

The screen is intermittenty disappeared . LED is green screen is distorted weiderly (happened 2 a day)CANVASX

cause : bad connection between Y-Board and #1, 2 pin ofY-Drive Board Connector

troubleshooting : connect bad linking between Y-Board &Y-Drive with jump wire (all 4 parts)

see working instruction(revised since Dec,2001. 1)

normal



No PowerX CANVAS

No Power( in ST-BY mode, but no LED)

CANVASX

normal

Check the power supply & main power S/W onCheck EMI board fuse (check the rated capacity )

Be sure to use rated fuse.Fuse 15 A



No RasterX CAVBAS

when Powers on, after 2 ~ 3 sec, its off( LED changing green into red )

CANVASX

normal

CHECK : remove STB and operate monitor individually.(check STB defect or Monitor defect )When using ANALOG STB, check STB onlyMN-42PZ10 only STB : RN-BA11Remove each Boards power supply connector and check the power is off.When the power is not off,replace the related board.



No PictureX CANVAS

no picture (LEDs green)

CANVASX

normal

Core checkpoint : remove STB and operate monitor individually.(check whether STBs a defect or monitors one)With monitor defect, check VSC and then Controller Board.

Troubleshooting : replace VSC Board



Address Bar ( Horizontal Bar )

X CANVAS CANVASX

no image (LEDs green) normal

Y-Drive Board ( Bottom )

Cause : Y-Drive ( Bottom ) defectTroubleshooting : Y-Drive (lower part) replacementThis problem is shown in the bottom of screen,So it is caused by Y-Drive


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Address Bar ( Horizontal Bar )

X CANVAS CANVASX

no image (LEDs green) normal

Y-Drive Board ( Top )Cause : Y-Drive Board (upper part) defectTroubleshooting : Y-Drive Board replacement


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No PictureX CANVAS

no image (LEDs green)

CANVASX

normalPD501 Connector

cause : PD-501 Connector contact point defecttroubleshooting : PD-501 Connector replacement(with PD-501 Connector contact point defect,Various defect symptoms can be seen)


12/70


High frequency noise (Bee sound)

X CANVAS CANVASX

normal picture with high frequency noise (bee) normal

Open C8139 rightlead and then

wire R8164 rightlead

C8178 0.22uF

electrolyticcapacitor insertion

SMPS is supposed to operatewith high frequency sosmall noise is not consideredas a defect.Power (SMPS) Board1. C8178 0.22/50V add2. Open C8139 right lead,and then connect it toR8164 right lead.Improved since Nov,2001

#. Slight noise is not a defect and write down explanation


13/70


No picture in right-2/5 areaX CANVAS CANVASX

normalo picture in the right-2/5 area

X-Board ( Left ) power supply checkX-Board ( Left )Connector checkX-Board ( Left ) replacement


14/70


Address Bar (Vertical )X CANVAS CANVASX

normaltripe in right-2/5 area

X-Board ( Left ) power supply checkX-Board ( Left ) Connector checkX-Board ( Left ) replacement


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No picture in left 3/5 of the screenX CANVAS CANVASX

normaleft 3/5 of screen with vertical stripes

X-Board ( Right ) power supply checkX-Board ( Right )Connector checkX-Board ( Right ) replacement


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Address Bar (Vertical )X CANVAS CANVASX

normaleft 3/5 of screen with vertical stripes.

X-Board ( Right ) power supply checkX-Board ( Right )Connector checkX-Board ( Right ) replacement


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No RedX CANVAS CANVASX

no Red ( B or G ) normal

Be sure not to bend it by force or internalInsulated conductor can be down.

Test Monitor individually.If detect a problem with monitor, check VSC Board.If it has a problem with STB connecting, focus on 25 Pin.Be sure not to connect 5 Pin (AP-EA10) by force

25 Pin Cable P/No : GVZ AP-EA10

1) X B d COF C t ti


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1) X - Board COF Connector separation 42 Inch

When you handle COF CONNECTOR, dont pressure. First release LOCK and separate.If COF CONNECTOR is damaged, you should replace MODULE ASSY. So, be aware of this!! COF Connector

Lift up X-BOARD CONNECTOR and separateCOP CONNECTOR by pulling up.

Lift up the right and left of X-BOARD CONNECTOR.

WarningWarning

When you exchange X-Board, first you should separate COFConnector. Be careful to handle it.COF Connector is attached to Module. When COF Connector isbroken, Module ASSY must be replaced a new one.

When you exchange X-Board, first you should separate COFConnector. Be careful to handle it.COF Connector is attached to Module. When COF Connector isbroken, Module ASSY must be replaced a new one.

2) X B d C t ti


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2) X - Board Connector separation

Lift up each edge of left/right. Lifted condition

Be careful to handle LOCK or it can be broken.When LOCK is broken, replace a new X-BOARD.

WarningWarning

Its easy to separate it by releasing Connector Lock .

Do not pressure or it can be hurt.When LOCK is hurt, replace a new X-BOARD

3) Y Board COF Connector separation


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3) Y - Board COF Connector separation

Pull the white LOCK as shown in arrow

Pull the white LOCK as shown in arrow.

Separate COF CONNECTOR by pulling in the left.

WarningWarning

Be careful to handle LOCK and COF Connector. When LOCK part is damaged, you should replacea new Y-Board. In case of COF Connector, Module Assembly.

4) Z Board COF Connector separation


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4) Z - Board COF Connector separation

Condition in Lock part is pulledSeparate the fixed Screw of Z-Board.Pull out Lock as shown in arrow.

Pull COF Connector as shown in arrow.

Its easy to separate COF on conditionthat Z-Board Screw is separated.In case Z-Board is assembled, its reallyhard to separate.

Be careful not to tear COF Connector.

If COF Connector is torn, replace a new Module Assembly

WarningWarningCOF Connector

5) Connector separation Guide


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5) Connector separation Guide

Push LOCK and pull out

PUSH PUSH PUSH

PULLPUSH PUSH

6) Control Board & VSC Board Connector


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6) Control Board & VSC Board Connector

7) Gas injection (Sealing up) condition


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7) Gas injection (Sealing up) condition

Be sealed up after gas injectionBe sealed up after gas injection

Be careful to handle the sealed-up part after gas injection.If it is broken, the gas escapes. So, replace the Module.

WarningWarning

8) Power off in 2 ~ 3 minutes(Protection)


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8) o e o 3 utes( otect o )

Power is On and off 2~3 minutes.(Protection)

Power is On and off 2~3 minutes.(Protection)

P301 Connector Open Check.P301 Connector Open Check. X - Board Top Right Change.X - Board Top Right Change.OK

P302 Connector Open CheckP302 Connector Open Check X - Board Top Left Change.X - Board Top Left Change.OK

P303 Connector Open CheckP303 Connector Open Check



X - Board Bottom Right Change.X - Board Bottom Right Change.OK

X - Board Bottom Left Change.X - Board Bottom Left Change.OK

Z - Board Change.Z - Board Change.OK

P3, P2 Connector Open CheckP3, P2 Connector Open CheckOK

Y - Board Change.Y - Board Change.

P005, P003 Connector Open CheckP005, P003 Connector Open Check


VSC- Board Change.VSC- Board Change.OK

VSC - Board Change.Sound Output IC Short Check

VSC - Board Change.Sound Output IC Short Check

Power Board ChangePower Board Change

OKPROTECT operation;

When the load voltage is short.

When each voltage doesnt work (in general)

PROTECT operation;

When the load voltage is short.

When each voltage doesnt work (in general)

9) Power off in 2 ~ 3 minutes(Protection)


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) ( )

L813 Cold Solder

Symptom : As soon as the power on,its off in 2 - 3minutes.(PROTECT operation)

Cause : No VS voltageL813 Coil cold soldering.

CheckCheck

Open the Connector connecting to each Board to check the power is off.

if each Board is same, check the Power Board and voltage.

10) ADD BAR inspection and repair


27/70


p p

HEATRUN : WHITE

Press the ADJ KEY and check the position of add bar by changing WHITE orRED or BLUE or GREEN

Top Right Top Left

Bottom Right Bottom Left

MP-40PA10 uses 4 board such as left,right, top and bottom.

Divide the screen in 4 and once you see ADD BAR check COF CONNECTORbetween MODULE and X-BOARD.If there is no defect in COF CONNECTOR replace X-BOARD.But the problem still remains and check the connector between X-BOARD andCONTROL BOARD. And if you cant find defect, check CONTROL.

11) One Point Service Guide


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Symptom : B color 1 Address line Open

Cause : Dented COF

COF is dented


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Symptom : Inferior R Address color

Cause : Inferior DATA output by cold soldering 16 pin of IC14 in X-L-TOP

( Normal waveform after tearing off IC Pin)

Countermeasure : Replace X-L-TOP board.

IC14

Cold Soldering

Abnormal waveform by cold soldering

Normal waveform after tearing off IC pin


30/70


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CheckCheck

The top left part of screen is broken(Top Right X-BOARD)

Symptom Cause Countermeasure

No 5V supply to Top rightX-Board.

Connect 5V line

Check Top right X-BOARD 5V.(If 0V, it happens)

Check 5V line from SMPS to X-BOARD.


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CheckCheck

Pinkish screen in the top left.(Top right X-BOARD)


No Va(70V) supply to Topright X-Board.

Connect 70V line

Check Top right X-BOARD Va(70V).(If 0V, it happens)

Check 70V(Va) line from SMPS to X-BOARD.


33/70


CheckCheck

The 3/5 top left in the screen is blank(Top Right X-BOARD)


Check Top right X-BOARD 12V.( If 0V, it happens )

Check Top right X-BOARD Va(70V).(If 0V, it happens)

Check 12V & 70V(Va) line from SMPS to X-BOARD.

No 12V supply to Top rightX-Board.

No Va(70V) supply to Top

right X-Board.

Connect 12V line

Connect 70V line


34/70


CheckCheck

The 3/5 top right of the screen is blank.(Top left X-BOARD)


No 12V supply to Top leftX-Board.

No Va(70V) supply to Top

left X-Board.

Connect 12V line

Connect 70V line

Check Top left X-BOARD 12V.( If 0V, it happens )

Check Top left X-BOARD Va(70V).(If 0V, it happens)

Check 12V & Va(70V) line from SMPS to X-BOARD.


35/70


CheckCheck

Pinkish screen in the 1/5 top right(Top left X-BOARD)

P1 COF connector on Top leftX-Board is open.

Reassemble it

Check the contact point and Locking of P1 on Top left X-BOARD.



36/70


CheckCheck

The 3/5 bottom left of screen is broken.(BOTTOM RIGHT X-BOARD)


No 5V supply to bottom rightX-Board.

Connect 5V line

Check Bottom right X-BOARD 5V.( If 0V, it happens )



37/70


CheckCheck

The 3/5 bottom left of the screen is Blank.(Bottom Right X-BOARD)


Check Bottom right X-BOARD 12V.( If 0V, it happens )


No 12V supply to bottom rightX-Board.

No Va(70V) supply to bottomright X-Board.

Connect 12V line


38/70


CheckCheck

The 2/5 right of the screen is broken.(Bottom left X-BOARD)


Check Bottom left X-BOARD 5V.( If 0V, it happens )


No 5V supply to bottom leftX-Board.

Connect 5V line


39/70


CheckCheck

The 2/5 right part of the screen is blank.(Bottom left X-BOARD )

No 12V supply to bottom leftX-Board.

Connect 12V line

Check Bottom left X-BOARD 12V.( If 0V, it happens )




40/70


CheckCheck

ADDRESS bar appears in the right bottom of the screen.(X-BOARD BOTTOM LEFT)

The connecting of X-Board bottomleft connector is bad.

Reassemble it.

Check connecting of the connector of bottom left X-BOARD.

Reassemble it.

X-BOARD BOTTOM LEFT CONNECTOR

OPEN.


Examples


41/70



42/70


CheckCheck

Screen is divided in top and bottom, and vertical barappears.

Connector(P13) is OPEN orConnecting condition is bad

Reassemble P13.

P13 CONNECTOR contact point inferior CHECK.

P13 CONNECTOR SIGNAL CHEK.

P13 CONNECTOR



43/70


CheckCheck

Screen is broken and has the vertical/horizontal bar.

VSC Board Connector is Open. Reassemble VSC BoardConnector

Check the connector connecting

Reassemble the Connector



44/70


Check

Check

The screen is bluish(Mosaic screen)

Loose VSC Board Connector Reassemble VSC BOARDConnector

Check the connection condition of the Connector.

Reassemble the Connector.



45/70


CheckCheck

The mosaic appears in the screen when it connects to VIDEO Input.(The sensibility of Y-signal is low.)When connected to Component Input, it is O.K.

Bad IC203 Replace IC203(VPC3230D)

Check if X201 on VSC board oscillates.Check Video In/Out of IC203 on VSC board.

IC201(VPC3230D)

Decoder IC


Examples


46/70

LG Electronics/DND QA Gr46/70IC201(VPC3230D) Decoder is inferior

Cause


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CheckCheck

Noise with division of colors

Bad Connector connectingControl Board and VSC B/D.

Contact point and signal condition of Connector Control Board and VSC Board.

Abnormal Normal

Bad Connector

SymptomCause

Countermeasure

Change the Connector

N N i l V i l B


48/70


Name No signal Vertical Bar

Symptom Cause and Countermeasure

Realization

1.Cause : Bad IC2 (DA1)

8cm

When ASIC Chip(IC2 DA1 LGD4001) on Control Board getshigh temperature, you can observe it(In normal temperature its O.K. )

IC2 DA1(Data Arrange) No.162 Pin output is changing

depending on the temperature. abnormal X-Bd Buffer IC

* Room temperature : 2.5V Output (Normal Pin = over 2.8V)

* Heated : 1.5V Output(Normal Pin = 2.7V )

Bad IC2 (DA1)

< Waveform of normal pin>

heated< Waveform of abnormal pin >

heated

DA1

Buffer

DA1

Buffer

Buffer(74ACT541) waveform abnormally narrows.In this case, it is impossible for Flip Flop(74AC574) onX B/D to read data.

2. Countermeasure : Replace IC2


49/70


Name Add Open (Green 1 Line)


1.cause: Add. COF Drive IC inferior

Normal Line Data waveform Open Line Data output waveform

the output of inferior line less than that of the normal LineAdd. COF Drive IC inferior COF inspection : 24V Open check (normal 50V)

Add. COF Drive IC


50/70


Name Vertical bar when Power off/on(Mis-discharge)


Realization

1.PDP Power on Mode external input(regardless of wire/wireless signal but its easy to reenact in wireless

signal)2. Remove Power Cord (Powers off)3.after about 20minutes, insert Power cord(automatically the Powers on and the vertical bar is shown as above)

1.Cause : Control board malfunctions when Power off/on.

2.Countermeasure: Change some parts on Control board.

3.Changing parts : A32_CTRL_03 B/D (Marked on PCB)

-.R14,17,18,21 : 330 ==> 4.7K (Chip Resistor)-.R15,16,19,20 : 22K ==> 4.7K (Chip Resistor)-.C504, 505 : 0.1uF / 50V add (Chip Capacitor)

Control board

2. 60 Inch Power PCB Voltage Adjustment

TP5 GNDWhen replacing PDP module & power board,


51/70


++

DMM

TP5 GND

TP6 VA

VR8401

VA Adjust

VS Adjust

VR8501 TP3GND

TP4VS

Be sure to adjust Power Assy voltage.

PFC + PFC -

PFC PACK

VR801

380V 1V

1. PFC adjustment

-. Select 100% White Pattern signal and warm it up enough.-. Connect DMM with TP PFC+ and TP PFC (GND).-. adjust VR801 to 380V (within 1V ).

2. Va adjustment-. Connect DMM + terminal with P814 #1 Pin.-. Turn VR8401 (Va Adj) to adjust the voltage on DMM to Va voltage

value marked on panel bottomright label. (allowable error :0.5V )

3. Vs adjustment-. Connect DMMs + terminal with P803 # 9 Pin.

-. Turn VR 8501 (Vs Adj )to adjust the voltage on DMM to Vs voltagevalue marked on panel bottom-right label.

Power Supply Section


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Power & no RasterPower & no Raster

PFC Board R8301,R8302R8303 OPEN check

PFC Board R8301,R8302R8303 OPEN check R8301,R8302,R8303 replacement

R8301,R8302,R8303 replacement

Controller BoardVS ON check

Controller BoardVS ON check

When Main S/W ON,ST-BY LED ON check (RED)

When Main S/W ON,ST-BY LED ON check (RED)

When SUB S/W on,LED GREEN check

When SUB S/W on,LED GREEN check

R8538, R8539,R8540OPEN check

R8538, R8539,R8540OPEN check

VS, VA PACKFunction checkVS, VA PACKFunction check

each Connector& connection check

each Connector& connection check

AC input check (220V)AC input check (220V) Connection Plug with setConnection Plug with set

AC Line Fuse checkAC Line Fuse check

FAN function checkFAN function check 5V MONI, 5V CTL output check5V MONI, 5V CTL output check

Controller Board replacementController Board replacement

Sound Section


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Input jack check(25Pin cable L,R input check)

Input jack check(25Pin cable L,R input check)

Connector between SP& set check

Connector between SP& set check IC601 (MSP3401) check

IC601 (MSP3401) check IC603 (LA4282) checkIC603 (LA4282) check

Sound power (P806A,B)Cable connection check

Sound power (P806A,B)Cable connection check

Sound terminalVoltage check

(32V)

Sound terminalVoltage check

(32V)

F8811 Fuse Opencheck

F8811 Fuse Opencheck

Speaker connectionline check

Speaker connectionline check

Video Signal Section


54/70


Abnormal screenAbnormal screen

PC signal inputPC signal input IC501 ( JAGASM check )IC501 ( JAGASM check )

IC406 ( ADV 7123 ) checkIC406 ( ADV 7123 ) check

IC404 ( FLI2220 ) checkIC404 ( FLI2220 ) check

IC403 ( FLI2220 )checkIC403 ( FLI2220 )check

IC201 (VPC3230 ) checkIC201 (VPC3230 ) check

Input jack& Connector check

Input jack& Connector check

IC203 ( CXA2101 ) checkIC203 ( CXA2101 ) check IC901 (SII 150 ) check)IC901 (SII 150 ) check)

P901 ( 21 Pin cable ) checkP901 ( 21 Pin cable ) check

No power


55/70


X CANVAS CANVASX

normalNo power ( LED is not on in ST-BY)

AC power voltage checkAC power voltage check

Main Power S/W checkMain Power S/W check

F8301 Fuse (15A) checkF8301 Fuse (15A) check

F8301 Fuse (15A) replacementF8301 Fuse (15A) replacement

F8302 Fuse checkF8302 Fuse check

On-and-offDisappearing or error while watching


56/70


pp g g

X CANVAS CANVASX

normalIntermittent image disappearing. LEDs green

Cause : Y-Board VR301 waveform adjustment defectTroubleshootng : Y-Board VR301 Adjust

See the next instructon(improved since Dec,2001)

Cause : Y-Board VR301 waveform adjustment defectTroubleshootng : Y-Board VR301 Adjust

See the next instructon(improved since Dec,2001)

Auto power offAutomatic off as soon as power is on ( Protect )


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X CANVAS CANVASX

normalAutomatic off after 2~3 seconds ( Protect )

Cause : X-Board internal IC Short

Troubleshooting: replace the defective X-Board& DC-DC Board

*. Remove X Board power supply connector to checkwhether power is off.

X - Board

Auto power offAutomatic off as soon as power is on ( Protect )


58/70


X CANVAS CANVASX

normalAutomatic off after 2 3 seconds ( Protect )

Cause : Y Board 220V Line Short

Troubleshooting : Y Board replacement

*. Remove Y Board power supply connector to checkWhether power is off.

Y - Board

Address Bar(Vertical)X CANVASX CANVAS


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X CANVASX CANVAS

Address Bar. ( Red Pattern reception )ddress Bar. (Gray Pattern reception)

CANVASXX-Board COF Drive IC check-Board COF Drive IC check

X-Board Connector checkX-Board Connector check

X-Board replacementX-Board replacement

Module ( Panel )replacementModule ( Panel )replacement

Address Bar(Vertical)X CANVASX CANVAS


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X CANVASX CANVAS

Intermittent image disappearing. LED is green image distorted (occurring twice a day)

CANVASXX-Board COF Drive IC check-Board COF Drive IC check

X-Board Connector checkX-Board Connector checkX-Board replacementX-Board replacement

Module ( Panel )replacementModule ( Panel )replacement

normal

Address Bar(Horizontal)X CANVAS

X CANVAS


61/70


X CANVASX CANVAS

One horizontal line in the top part normal

Y-Board & Y-Drive Board ConnectorcheckY-Board & Y-Drive Board Connectorcheck

Y-Drive Board ( Top ) Drive IC checkY-Drive Board ( Top ) Drive IC check

Y-Drive Board replacementY-Drive Board replacement


X CANVAS


62/70


X CANVASX CANVAS

normalingle horizontal bar in the bottomCANVASX


Y-Drive Board ( Bottom ) Drive IC checkY-Drive Board ( Bottom ) Drive IC check



X CANVAS


63/70


XX

Image is on and off. LEDs green normal


Y-Drive Board ( Top ) Drive IC checkY-Drive Board ( Top ) Drive IC check



X CANVAS


64/70


XX

normalreen dot line on the screen

VSC Board & Controller Board Connector checkVSC Board & Controller Board Connector check

Controller Board checkController Board check

Controller Board replacementController Board replacement

Address Bar(Vertical)Address Bar ( Vertical ) & partial no-picture

X CANVAS X CANVAS


65/70


X CANVAS X CANVAS

X CANVAS

normal

Central top 4/10 of screen with no-picture

related X-Board Connector checkrelated X-Board Connector check

related X-Board & Controller Board Connector checkrelated X-Board & Controller Board Connector check

related X-Board replacementrelated X-Board replacement

Module (Panel ) checkModule (Panel ) check

Central top 4/10 of the screen with vertical bar

related X-Board power supply voltage checkrelated X-Board power supply voltage check


X CANVAS

X CANVAS


66/70


X CANVASX CANVAS

Bottom left 3/10 of the screen with vertical bar Bottom left 3/10 of the screen with no-picture

Related X-Board power supply voltage checkRelated X-Board power supply voltage checkX CANVAS

Related X-Board Connector checkRelated X-Board Connector check

Related X-Board & Controller Board Connector checkRelated X-Board & Controller Board Connector check

Related X-Board replacementRelated X-Board replacement


normal

Address Bar(Vertical)X CANVAS X

Address Bar ( Vertical ) & partial no-picture

CANVAS


67/70


X X

Bottom right 3/10 of the screen with no-pictureBottom right 3/10 of the screen with vertical bar

related X-Board power supply voltage checkrelated X-Board power supply voltage check X CANVAS





normal


X CANVAS

X CANVAS


68/70


XX

Central bottom 4/10 of the screen with vertical bar Central bottom 4/10 of the screen with no-picture

Related X-Board power supply voltage checkRelated X-Board power supply voltage check X CANVAS





normal


X CANVAS CANVASX


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X S CANVASX

Top right 3/10 of the screen with vertical bar Top right 3/10 of the screen with no-pictureRelated X-Board power supply voltage checkRelated X-Board power supply voltage check CANVASX





normal


X CANVAS CANVASX


70/70


X CANVAS CANVASX

Top left 3/10 of the screen with no-pictureop left 3/10 of the screen with vertical barRelated X-Board power supply voltage checkRelated X-Board power supply voltage check CANVASX





normal

Date post:	08-Apr-2018
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Guide de d%e9pannage Des TV Plasma LG

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