Lg Plasma...Fallas y Soluciones

PDP One Point Repair GuidePDP One Point Repair Guide

1.1. GeneralGeneral2.2. 40 ~ 50 Inch Practice40 ~ 50 Inch Practice3.3. 60 Inch Practice60 Inch Practice

PCB Pattern Short

1. Check after X-Board change

2. Do shortage check neighboring pins of FPC* connector

3. Check soldering condition of defect pin

4. Scan the pattern connected to defect pin with Microscpoe

Change X board

Symptom Cause Countermeasure

CHECK PointCHECK Point

*FPC : Flat Pin Connector

Red Bar at left lower

(Bad X-Board PCB)

2/88 LG Electronics / DND / QA Gr.

Red & Green pin of left lower 4th FPCshort

Defect Point : Short on the PCB just above connector

PCB

1. Cause : Short by solder bridge - Can not observe with naked eye - When connector open, pattern is OK

G R

Change X-Board

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 output stage and PCB pattern.

4. If no problem, check the connector lead board.


Check PointCheck Point


Bottom Right 6th FPC R/B Short

Pattern Short by connector miss insert Re-insert the Connector



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 output stage and PCB pattern.

4. If no problem, check the connector lead board.


SHORT

ADD Electrode short at R,G,B Rasteror White Screen(Different color display)

Foreign Material(Iron powder)in the Connector

Insulation tape

Gap

Apply silicon on the Connector lead ←Pay attention to a capillary symptom

↓

X-Board Tape Rework

1. Trace defected line

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




OPEN

1. Outbreak during heat run2. ADD Electrode open at one color Raster or White screen(No discharge)

Interfere with mechanicalstructure when Moduleassembling

Keep horizontal, orcan be defected

Cold soldering atConnector

Use Connector fixing iron plate ⇒ Keep the contact point horizontal when interfere with mechanical parts

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

Electrode line.

FPC connector Rework




ADD Pattern

Connected minutely and open slowly as time passes

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

ADD open

Replace the Panel




Panel Electrode

ACFFPC

Electrode

Open Electrode(16)

Resistance A

Resistance B

ADD Electrode openat Green Raster

~

~

1. ADD pattern of PAD siden open2. Width : 10 um

Resistance A Resistance B

16pin

1,3,15,17,19pin

1.2Ω 6.0Ω

1.0 ~1.2Ω 2.2~2.4Ω

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

Replace the Panel

* The difference of ADD open and Short ? ADD open : Black vertical bar at Raster ADD short : Different color vertical bar at Raster

CountermeasureSymptom & Cause



< Raster > < White >

ADD short at raster screen and ADD open atwhite screen appear at some area after 20minute HeatRun.

Con 1 Con 2

Control board

X-board

Solder bridge

1. Check the 5V(Logic voltage) input to DC-DC → If it is lower than 5V, it makes similar problem2. 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

Change Control Board




Driver clock line at X Driver Board is designed to operate in A and B group

Short circuit at clock line of Drive IC

If problem at input stage, several lines are defected at one point

Replace the X Board of defected point

PCB pattern shortShort

CLK LE

X-DRV IC

SN74ACT541

U1

R264R258

Change X-BOARD




<X-board>

1. Check the connection condition of the Connector.

2. Check the cold soldering.

X driverchip

(SN755851PJ)

1

64

Module

ChipResistors

4X16 = 64 data

16 clock

line1line2

line3line4

connector



ChangeX Board

ElectrodePattern

PCB pattern is connected minutely → Foreign material when photo resisting


Vertical bar in every 20mm

Resistance between 186 pin of U3 and 7 pin of U300 is 62 Ω Normal condition : 2Ω

Because of foreign material in Via hole at U300 side

U3ALTERA Chip

U300DRAM

Via hole

186pin PIN 7pin PIN

Control board

1. Measure the resistance of Via holes between U3 and U300 at Control Board and compare with that of normal.(Normal : 2~3 Ω)2. Resistance increases as temperature rises.

Change Control Board




- Open circuit between pin 7 of U200 and pin 7 of U7- Resistance between two pins varies from 19 ohm ~ 45Kohm

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

2. Check the resistance of VIA holes of suspect ICs

Replace Control Board




D1 D3 D4 PROM(U40)

FPGA

D1 D3 D4 PROM(U40)

FPGA

CONTROL BOARD

* For normal operation, PROM program should be downloaded to FPGA, and each PROM has corr- espondent FPGA. See left picture.

1. Because Control data on PROM(U40) doesn’t download to FPGA, it can’t generate control signal to X,Y and Z Board.2. Defected ALTERA.

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

•Replace Control Board•Replace PROM

- When Power On, Fan operates but No OSD displays- LED(D3) of Control Board doesn’t operate




Touch point(Marked)

No signal or at PC mode, dark red raster displays.This is darker than normal Red signal.

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

Neighboring Pins of U1(FPGA) touch

Control Board

Replace Controller board




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

1. CN1 on Vs Board cold soldering2. Spark marks between CN1 and Vs Board -> It makes them open

Solder land

Soldering Direction

Solder

Soldering Direction

Soldering point

Vs board

CN1

1. Check Vs, Va with multimeter(No Vs output)

2. Separate SMPS Board and VSC Board and check all voltage output stage

3. Check FET, TR, Diode and Resistor(especially Cement Resistor)

4. Observe PCB Pattern and soldering condition with naked eyes

Replace DC-DC 2 board


Symptoms Cause Countermeasure


17/88

P6

P4

Rework should be done

Y-Driver Board

Y-Board

4242”” PDP Flicker and PDP Flicker and No Raster TroubleshootingNo Raster Troubleshooting Guide Guide

cause : bad connection between Y-Board # 1, 2 drive board Connector pin

42 Inch40 ~ 42 Inch

LG Electronics / DND / QA Gr.

18/88

amplified amplified

① : outside Leg : inside Leg②

•P 6, P 4 both are the first pin, when wiring, 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)

•Don’t be confused with Pin number

•Improved since Dec,2001.

P 4 ①

②

②

①

①

②①

②

①②

②①

P 6


19/88

②

①②

②①

①

②

①

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


20/88

X CANVAS X CANVAS

Intermittent no-image/image error while watching

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

normal

cause : bad connection between Y-Board and #1, 2 pin of Y-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)

CANVASX


21/88

X CANVAS

normal

CANVASX

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

Check the power supply & main power S/W on

Check EMI board fuse (check the rated capacity )

No Power

Fuse 15 A

Be sure to use rated fuse.


22/88

X CANVAS

normal

CANVASX

when Power’s on, after 2 ~ 3 sec, it’s off ( LED changing green into red )

CHECK : remove STB and operate monitor individually. (check STB defect or Monitor defect )

When using ANALOG STB, check STB only MN-42PZ10 only STB : RN-BA11

Remove each Board’s power supply connector and check the power is off.When the power is not off,replace the related board.

No Raster


23/88

X CANVAS

normal

CANVASX

no picture (LED’s green)

Core checkpoint : remove STB and operate monitor individually. (check whether STB’s a defect or monitor’s one)

No Picture

With monitor defect, check VSC and then Controller Board.

Troubleshooting : replace VSC Board


24/88

X CANVAS

normal

CANVASX

no image (LED’s green)

Cause : Y-Drive ( Bottom ) defect

Troubleshooting : Y-Drive (lower part) replacement

Address Bar ( Horizontal Bar )

Y-Drive Board ( Bottom )

This problem is shown in the bottom of screen,So it is caused by Y-Drive


25/88

X CANVAS

normal

CANVASX


Address Bar ( Horizontal Bar )

Y-Drive Board ( Top )

Cause : Y-Drive Board (upper part) defect

Troubleshooting : Y-Drive Board replacement


26/88

X CANVAS

normal

CANVASX


PD501 Connector

No Picture

cause : PD-501 Connector contact point defect

troubleshooting : PD-501 Connector replacement

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


27/88

X CANVAS

normal

CANVASX

normal picture with high frequency noise (“bee”)

High frequency noise (“Bee” sound)

C8178 0.22uF electrolytic capacitor insertion

Open C8139 right lead and then wire R8164 right lead

Power (SMPS) Board

1. C8178 0.22 /50V add2. Open C8139 right lead, and then connect it to R8164 right lead.

Improved since Nov,2001

SMPS is supposed to operatewith high frequency sosmall noise is not considered as a defect.

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


28/88

X CANVAS

normal

CANVASX

No picture in right- 2/5 area

No picture in the right- 2/5 area

X-Board ( Left ) power supply check

X-Board ( Left )Connector check

X-Board ( Left ) replacement


29/88

X CANVAS

normal

CANVASX

Address Bar (Vertical )

stripe in right-2/5 area

X-Board ( Left ) power supply check

X-Board ( Left ) Connector check

X-Board ( Left ) replacement


30/88

X CANVAS

normal

CANVASX

X-Board ( Right ) power supply check

X-Board ( Right )Connector check

X-Board ( Right ) replacement

left 3/5 of screen with vertical stripes

No picture in left 3/5 of the screen


31/88

X CANVAS

normal

CANVASX

X-Board ( Right ) power supply check

X-Board ( Right )Connector check

X-Board ( Right ) replacement

Address Bar (Vertical )

left 3/5 of screen with vertical stripes.


32/88

X CANVAS

normal

CANVASX

no Red ( B or G )

Be sure not to bend it by force or internal Insulated 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

No Red


33/88

Lift up the right and left of X-BOARD CONNECTOR. Lift up X-BOARD CONNECTOR and separate COP CONNECTOR by pulling up.

When you handle COF CONNECTOR, don’t pressure. First release LOCK and separate.If COF CONNECTOR is damaged, you should replace MODULE ASS’Y. So, be aware of this!!

1) X - Board COF Connector separation

When you exchange X-Board, first you should separate COF Connector. Be careful to handle it.COF Connector is attached to Module. When COF Connector is broken, Module ASS’Y must be replaced a new one.

When you exchange X-Board, first you should separate COF Connector. Be careful to handle it.COF Connector is attached to Module. When COF Connector is broken, Module ASS’Y must be replaced a new one.

WarningWarning

COF Connector

42 Inch


34/88

Lift up each edge of left/right. Lifted condition

2) X - Board Connector separation

It’s 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

WarningWarning

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


35/88

Pull the white LOCK as shown in arrow

Pull the white LOCK as shown in arrow.

Separate COF CONNECTOR by pulling in the left.

3) Y - Board COF Connector separation

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.


36/88

4) Z - Board COF Connector separation

Separate the fixed Screw of Z-Board.Pull out Lock as shown in arrow.

Condition in Lock part is pulled Pull COF Connector as shown in arrow.

It’s easy to separate COF on conditionthat Z-Board Screw is separated. In case Z-Board is assembled, it’s reallyhard to separate.

Be careful not to tear COF Connector.If COF Connector is torn, replace a new Module Assembly

WarningWarning COF Connector


37/88

Push LOCK and pull out

PUSH PUSH PUSH

5) Connector separation Guide

PUSH PUSH PULL


38/88

6) Control Board & VSC Board Connector


39/88

Be 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.

7) Gas injection (Sealing up) condition

WarningWarning

Be sealed up after gas injection


40/88

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.

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

P303 Connector Open CheckP303 Connector Open Check



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

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

Z - Board Change.Z - Board Change.

P3, P2 Connector Open CheckP3, P2 Connector Open Check Y - Board Change.Y - Board Change.

P005, P003 Connector Open CheckP005, P003 Connector Open Check


VSC- Board Change.VSC- Board Change.

VSC - Board Change.Sound Output IC Short Check

VSC - Board Change.Sound Output IC Short Check

Power Board ChangePower Board Change

OK

OK

OK

OK

OK

OK

OK

OKPROTECT operation;

When the load voltage is short.

When each voltage doesn’t work (in general)

PROTECT operation;

When the load voltage is short.

When each voltage doesn’t work (in general)

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


41/88

L813 Cold Solder

Check Check

Open the Connector connecting to each Board to check the power is off.if each Board is same, check the Power Board and voltage.

Symptom : As soon as the power on, it’s off in 2 - 3minutes. (PROTECT operation)Cause : No VS voltage L813 Coil cold soldering.

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


42/88

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 can’t find defect, check CONTROL.

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

10) ADD BAR inspection and repair


43/88

Symptom : B color 1 Address line OpenCause : Dented COF

COF is dented

11) One Point Service Guide


44/88

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


45/88

CheckCheck

The blue spreads on the screen (Mis-discharge) and power off in 2 ~ 3 seconds.If you turn on again, it will be same problem.

Symptom Causes Countermeasure

If 15V line voltage reduces below 14V,Mis-discharge occurs and power off because of protection circuit.

Replace PSU(Power Supply Unit)and defective X-Board.

If when Power on, screen shows like above and turn off in 2 seconds, check if turning off or not by disconnectingall X & Y boards.

Defective X-Board


46/88

Check Check

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


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.


47/88

CheckCheck

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


No Va(70V) supply to Top right 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.


48/88

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


49/88

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.


50/88

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.



51/88

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 )



52/88

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 bottom right X-Board.

Connect 12V line


53/88

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


54/88

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 )




55/88

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 CONNECTOROPEN.



56/88

Examples


57/88

CheckCheck

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

Connector(P13) is OPEN or Connecting condition is bad

Reassemble P13.

P13 CONNECTOR contact point inferior CHECK.

P13 CONNECTOR SIGNAL CHEK.

P13 CONNECTOR



58/88

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



59/88

CheckCheck

The screen is bluish(Mosaic screen)

Loose VSC Board Connector Reassemble VSC BOARDConnector

Check the connection condition of the Connector.

Reassemble the Connector.



60/88

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



61/88

IC201(VPC3230D) Decoder is inferior

Examples


62/88

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


63/88

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 it’s O.K. )

IC2 DA1(Data Arrange) No.162 Pin output is changing depending on the temperature. abnormal X-B’d 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) on X B/D to read data.

2. Countermeasure : Replace IC2


64/88

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 검사기 : 24V Open check (normal 50V)

Add. COF Drive IC


65/88

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


Realization

1.PDP Power on Mode external input (regardless of wire/wireless signal but it’s easy to reenact in wireless signal)2. Remove Power Cord (Power’s off)3.after about 20minutes, insert Power cord (automatically the Power’s 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


66/88

X CANVAS X CANVAS

Normal

MODEL : MN-50PZ40S

Check Point : Cable & X-Board

Symptom : ADD Bar(No signal)

Action : Module Control Change

Bottom Center No Picture

50 Inch


67/88

X CANVAS X CANVAS

Normal Bottom Center X-Board

MODEL : MN-50PZ40S

Check Point : X-Board (Bottom)

Symptom : ADD Bar

Action : X Board Change


68/88

X CANVAS X CANVAS

Normal Horizontal Bar

Check Point : Y-Drive Board

Symptom : Horizontal Bar

Action : Y-Drive Board Change & Connector Clean


69/88

++

DMM

TP5 GND

TP6 VA

VR8401

VA Adjust

VS AdjustVR8501 TP3

GNDTP4VS

PFC + PFC -

PFC PACK

VR801

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

When replacing PDP module & power board,Be sure to adjust Power Ass’y voltage.

380V ± 1V

-. Connect DMM + terminal with P814 #1 Pin.-. Turn VR8401 (Va Adj) to adjust the voltage on DMM to Va voltage value marked on panel bottom- right label. (allowable error : ±0.5V )

3. Vs adjustment-. Connect DMM’s + terminal with P803 # 9 Pin.-. Turn VR 8501 (Vs Adj )to adjust the voltage on DMM to Vs voltage value marked on panel bottom-right label.

Power PCB Voltage Adjustment

<SMPS Board>

60 Inch


70/88

Power & no RasterPower & no Raster

AC input check (220V)AC input check (220V)

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 checkWhen SUB S/W on, LED GREEN check

R8538, R8539,R8540OPEN check

R8538, R8539,R8540OPEN check

VS, VA PACK Function checkVS, VA PACK

Function check

each Connector & connection check

each Connector & connection check

Connection Plug with setConnection Plug with set

AC Line Fuse checkAC Line Fuse check

PFC Board R8301,R8302R8303 OPEN check

PFC Board R8301,R8302R8303 OPEN check

FAN function checkFAN function check

Controller BoardVS ON check

Controller BoardVS ON check

R8301,R8302,R8303 replacementR8301,R8302,R8303 replacement

5V MONI, 5V CTL output check5V MONI, 5V CTL output check

Controller Board replacementController Board replacement

Power Supply Section


71/88

Connector between SP & set check

Connector between SP & set check IC601 (MSP3401) checkIC601 (MSP3401) check IC603 (LA4282) checkIC603 (LA4282) check Input jack check

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

(25Pin cable L,R input check)

Sound power (P806A,B)Cable connection checkSound power (P806A,B)Cable connection check

Sound terminal Voltage check

(32V)

Sound terminal Voltage check

(32V)

F8811 Fuse Opencheck

F8811 Fuse Opencheck

Speaker connection line check

Speaker connection line check

Sound Section


72/88

Abnormal screenAbnormal screen

PC signal inputPC signal input

IC406 ( ADV 7123 ) checkIC406 ( ADV 7123 ) check

IC404 ( FLI2220 ) checkIC404 ( FLI2220 ) check

IC403 ( FLI2220 )check IC403 ( FLI2220 )check

IC201 (VPC3230 ) checkIC201 (VPC3230 ) check

Input jack& Connector check

Input jack& Connector check

IC203 ( CXA2101 ) checkIC203 ( CXA2101 ) check

IC501 ( JAGASM check )IC501 ( JAGASM check )

IC901 (SII 150 ) check)IC901 (SII 150 ) check)

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

Video Signal Section


73/88

X CANVAS

No power ( LED is not on in ST-BY) normal

CANVASX

AC power voltage checkAC power voltage check

Main Power S/W checkMain Power S/W check

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

F8302 Fuse checkF8302 Fuse check

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

No power


74/88

X CANVAS

Disappearing or error while watching

Intermittent image disappearing. LED’s greennormal

Cause : Y-Board VR301 waveform adjustment defect

Troubleshooting : Y-Board VR301 Adjust

See the next instruction(improved since Dec,2001)

Cause : Y-Board VR301 waveform adjustment defect

Troubleshooting : Y-Board VR301 Adjust

See the next instruction(improved since Dec,2001)

CANVASX

On-and-off


75/88

X CANVAS

Automatic off as soon as power is on ( Protect )

Automatic off after 2~3 seconds ( Protect )normal

Cause : X-Board internal IC Short

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

*. Remove X – Board power supply connector to check whether power is off.

CANVASX

X - Board

Auto power off


76/88

X CANVAS

Automatic off after 2 – 3 seconds ( Protect )normal

Cause : Y – Board 220V Line Short

Troubleshooting : Y – Board replacement

*. Remove Y – Board power supply connector to check Whether power is off.

CANVASX

Y - Board

Auto power off

Automatic off as soon as power is on ( Protect )


77/88

X CANVAS X CANVAS

One horizontal line in the top part normal

Y-Board & Y-Drive Board Connector check Y-Board & Y-Drive Board Connector check

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

Y-Drive Board replacementY-Drive Board replacement

Address Bar(Horizontal)


78/88

X CANVAS X CANVAS

Single horizontal bar in the bottom

CANVASX

normal


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




79/88

X CANVAS X CANVAS

Image is on and off. LED’s green normal


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




80/88

X CANVAS X CANVAS

Green dot line on the screen normal

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

Controller Board checkController Board check

Controller Board replacementController Board replacement



81/88

X CANVAS X CANVAS

Address Bar. (Gray Pattern reception)

CANVASX

Address Bar. ( Red Pattern reception )

X-Board COF Drive IC checkX-Board COF Drive IC check

X-Board replacementX-Board replacement

X-Board Connector checkX-Board Connector check

Module ( Panel )replacementModule ( Panel )replacement

Address Bar(Vertical)


82/88

X CANVAS X CANVAS

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

normal

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

X-Board replacementX-Board replacement

X-Board Connector checkX-Board Connector check

Module ( Panel )replacementModule ( Panel )replacement



83/88

X CANVAS X CANVAS

X CANVAS

normal

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

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

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

Address Bar ( Vertical ) & partial no-picture



84/88

X CANVAS X CANVAS

X CANVAS

normal

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


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

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




85/88

X CANVAS X CANVAS

X CANVAS

normal

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

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








86/88

X CANVAS X CANVAS

X CANVAS

normal

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









87/88

X CANVAS CANVASX

normal

CANVASX

Top right 3/10 of the screen with vertical bar Top right 3/10 of the screen with no-picture









88/88

X CANVAS

Top left 3/10 of the screen with vertical bar

CANVASX

normal

CANVASX

Top left 3/10 of the screen with no-picture









Documents

Lg Plasma...Fallas y Soluciones