LED LCD TV Repair Guide

ⓒ LG Electronics. Inc.2008

LED LCD TV Repair GuideNew models 2009

Applicable to model numbers xxLH9000

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LGE3369A

IC100

RGB

COMPONENT

F-SCART

AV3

BUF_TS_CLK/ERR/SYN/DATA[0]

AV_CVBS_IN

COMP_Y/Pb/Pr

SC1_CVBS_IN

SC2_CVBS_IN

DSUB_ R/G/B

74LVC541ABufferIC502

CI S

lot

FE_VMAIN

FE_TS_DATA[0:7] CI_MDI[0:7]

H-SCART

SC1_R/G/B

FE_ VOUT

DTV/MNT_VOUT

MAX3232CDRIC403

SPDIF SPDIF_OUT

DSUB_H/VSYNC

CI_TS_DATA[0:7]

CI_Data[0:7] PCM_D[0:7]

PCM_A[8:14]

AUDIO IN (PC)

DGB_TX/RX

DDR2 SDRAM(1Gb)IC300

NAND FlashIC102(64MB)

USB

PCM_A[0:7]

SDDR_D[0:15]

TDDR_D[0:15]

SDDR_A[0:12]

MP6211DHIC402

USB Power

TDDR_A[0:12]

USB1_DM/DP

Serial FlashFor BootIC103

HDMI 1/2/3 Rear : 3

LGE7329AIC900

PanelLED

200Hz

TMDS351PAGRIC604

TMDS[0:7]HDMI_CEC

HPD 5V_HDMI

I2C

1. LH9000-ZA Block Diagram

TDFW-G235DTU1200

74LCX244BufferIC501

PCM_A[0:7]

CI_ADDR[0:7]

LVDS

EEPROMIC105

I2C

SPI_CK/CS/D0/D1

Side AV

USB0_DM/DP

HDMI 4 Side

AUDIO Out (Head Phone)

RS-232C

DDR2 SDRAM(512Mb)IC301

Digital amp(NTP3100L)

IC701

I2S L/R

TMDS[0:7]HPD, 5V_HDMI

Audio SwitchIC702

AUDIO Out (B/T Headset)

LG5110IC3502

LVDS

Local Key

LED A’ssy

IR & RGB Sensor

DDR2 SDRAM(512Mb)

IC1000/IC1001

EEPROMIC3504

Serial FlashIC902

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Contents of LED LCD TV Standard Repair Process

No. Error symptom (High category) Error symptom (Mid category) Page Remarks

1 No video/Normal audio 1

2 No video/No audio 2

3 Video error, Picture broken/ Freezing 3

4 Color error 4

5

A. Video error

Vertical/Horizontal bar, residual image, light spot, external device color error 5

6 No power 6

7B. Power error Off when on, off while viewing, power auto

on/off 7

8 No audio/Normal video 8

9C. Audio error

Wrecked audio/ discontinuation/ noise 9

10 No response in remote controller, key error 10

11D. Function error

External device recognition error 11

12 E. Noise Circuit noise, mechanical noise 12

13 F. Exterior error Exterior defect 13

First of all, Check whether there is SVC Bulletin in GCSC System for these model.www.te

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Normal audio

Y

N

Move to No video/No audio

No videoNormal audio

Check Back LightOn with naked eye On

Y

N

Check Power Board12v,5v etc.

Normal voltage

Y

N

Replace Main Board

Repair Power Board or parts

Check Power Board 20V /12V or 24v output

Normalvoltage

Y Replace LED Drive B/D or module

NRepair Power Board or parts

End

Always check & record S/W Version and White Balance value before replacing the Main Board Replace Main Board Re-enter White Balance value

※Precaution

Establisheddate Electronics 6-3

Standard Repair Process

Revised date

2009. 7 .29

1/13

Errorsymptom

A. Video errorNo video/ Audio OK

☞A3☞A1

☞A2

☞A4 & A7

1

First of all, Check whether all of cables between board is inserted properly or not.(Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)

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Normalvoltage?

Check various voltages of Power Board ( 5V,12V,20V or 24V…)

No Video/No audio

Check and replace MAIN B/D

Y

Replace Power Board and repair parts

N End


A. Video errorNo video/ No audio

☞A5


Revised date 2/13

Errorsymptom

2

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A. Video errorPicture broken/ Freezing

Y

N

☞ A6

N

Check RF Signal level

Normal Signal?

Check RF Cable Connection

1. Reconnection2. Install Booster

CheckS/W Version

Booster menuOn→Off: CheckOff→On: Check

S/W Upgrade

Check whether other equipments have problem or not.(By connecting RF Cable at other equipment)

→ DVD Player ,Set-Top-Box, Different maker TV etc`

SVC Bulletin?

ReplaceMain B/D

CheckTuner soldering

Normal Picture?

Y

N

Y

Close

Normal Picture?

YClose

■ Menu→Setup →Booster

. By using Digital signal level meter

. By using Diagnostics menu on OSD( Menu→Setup→Diagnostic)- Signal strength (Normal : over 50%)- Signal Quality (Normal: over 50%)

Normal Picture?

Y

Contact with signal distributoror broadcaster (Cable or Air)

N N

Normal Picture?

Y

Close

N

☞ A7



Revised date 3/13

Errorsymptom

3

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Colorerror?

Y

N

※ Check and replace Link Cable(LVDS) and contact condition

Y

N

Replace Main B/DColorerror?

Check error color input mode

Check color by input-External Input-COMPONENT-RGB-HDMI/DVI

YExternal device/Cablenormal

External Input/Component

error

Check external device andcable

YExternal device/Cablenormal

RGB/HDMI/DVI

error

Check external device and cable

Replace Main B/D

Replace Main B/D

N

N

A. Video errorColor error

☞A8

N

Y

End

Replace module

Request repair for external device/cable

Replace T-Con Board

N

Y

Colorerror?

LGD ModuleOnly

Other Module

Colorerror?

Check Test pattern

☞A11

☞ A10☞ A27



Revised date 4/13

Errorsymptom

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Screennormal?

N

YCheck external deviceconnection condition

Y

N

Check and replace Link Cable

Normal?

Y

NScreennormal? Replace Main B/D

Replace module

Check color condition by input-External Input-Component-RGB-HDMI/DVI

End

Vertical/Horizontal bar, residual image, light spot

Request repair for external device

A. Video errorVertical / Horizontal bar, residual image, light spot, external device color error

☞A14

External device screen error-Color error

External Inputerror

Connect other external device and cable(Check normal operation of External Input, Component, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc.

N

Y

Replace Main B/D

Screennormal?

Check screen condition by input-External Input-Component-RGB-HDMI/DVI

Request repair for external device

Componenterror

RGBerror

HDMI/DVI

Connect other external device and cable(Check normal operation of External Input, Component, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc.

Replace Main B/D

Screennormal?

N

Y

Check S/W Version

Y

NCheckversion

S/W Upgrade

Y

NNormalscreen?

End

Y

N

Replace T-Con Board

LGD Module Only

ReplaceModule

Other Module

Replace modulein abnormal displayingafter exchanging T-Con B'd

End


Revised date 5/13

Errorsymptom


☞A12☞ A13

Check Test pattern

☞ A27

5

Screennormal?

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B. Power errorNo power

Power LEDOn?

Y

N

DC Power onby pressing Power Key On Remote control

Y

NNormal operation?

Check Power On ‘”High”

Check Power cordwas inserted properly

Check Power LED

Replace Power B/D

Measure voltage of each output of Power B/D

N

YNormalvoltage?

Replace Main B/D

N

YOK?

Replace Main B/D

N

Y

Normal? Check ST-BY 5V

Replace Power B/DN

YNormal

voltage?

Replace Power B/D

Y

☞A15

☞A16

☞A17

☞A18



Revised date 6/13

Errorsymptom

※ ’09 years new model apply mechanical power switchto reduce power consumption in stand-by status.If mechanical power switch off→ Doesn’t turn on by remote control→ Doesn’t appear LED light

Please refer to the A21 Page6

. Stand-By: Red

. Operating: Green

Check & RepairMechanical Power switch

on Local control of TV

※☞A19

Close

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B. Power errorOff when on, off while viewing, power auto on/off

Error?N

Y

Check Power OffMode

Fix A/C code & Outlet and describe 3 wave length

Check A/C code

Check for 3 wave length

Check outlet

Replace Main B/DCPUAbnormal

(If Power Off mode is not displayed)Check Power B/D voltage

Y

N

Replace Main B/DNormalvoltage?

Replace Power B/D

Replace Power B/D

N

YNormal? End

※ CautionCheck and fix exterior of Power B/D Part

☞A20

☞A21


Revised date 7/13

Errorsymptom


7

Status Power off List Explanation"POWEROFF_REMOTEKEY" Power off by REMOTE CONTROL"POWEROFF_OFFTIMER" Power off by OFF TIMER"POWEROFF_SLEEPTIMER" Power off by SLEEP TIMER"POWEROFF_INSTOP" Power off by INSTOP KEY"POWEROFF_AUTOOFF" Power off by AUTO OFF"POWEROFF_ONTIMER" Power off by ON TIMER"POWEROFF_RS232C" Power off by RS232C"POWEROFF_RESREC" Power off by Reservated Record"POWEROFF_RECEND" Power off by End of Recording"POWEROFF_SWDOWN" Power off by S/W Download

Normal

"POWEROFF_UNKNOWN" Power off by unknown status except listed case"POWEROFF_ABNORMAL1" Power off by abnormal status except CPU troubleAbnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal

* Please refer to the all cases whichcan be displayed on power off mode.

Abnormal 1

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No audioScreen normal

Check user menu > Speaker off

OffN

Y

Cancel OFF and describe

Check audio B+ 20V or 24V of Power Board

Normalvoltage

Y

N

Replace Power Board and repair parts

Check Speaker disconnection

N

Y

Replace Speaker

Replace MAIN Board End

C. Audio errorNo audio/ Normal video

☞A22 ☞A23

Disconnection


Revised date 8/13

Errorsymptom


8

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→ Wrecked audio/discontinuation/noise is same after “Check input signal” compared to No audio

C. Audio errorWrecked audio/ discontinuation/noise

Wrecked audio/Discontinuation/

Noise for all audio

Check and replace speaker and connector


Noise only for D-TV


Noise only for Analog


Noise only for External Input

Connect and check other external device

N

Y

Normalaudio?

Check and fix external device

Replace Power B/D

N

Y

Normalvoltage?

Check input signal-RF-External Inputsignal

Signal normal?

(When RF signal is not received)Request repair to external cable/ANT provider

Y

Check audio B+ Voltage (20V or 24V)

Replace Main B/D

(In case of External Input signal error)Check and fix external device

Replace Main B/DN

End


Revised date 9/13

Errorsymptom


☞A24

9

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D. General Function ProblemRemote control & Local switch checking

Y

N

1. Remote control(R/C) operating error

Move Power problem

Section

2. Local(Mechanical) switch operating error

Check R/C itself Operation

Normaloperating?

Normaloperating?

Y

Close

Replace R/C

If R/C operate,Explain the customer cause is interferencefrom light in room.

Check R/C OperatingWhen turn off light

in room

Check & ReplaceBaterry of R/C

Check & RepairCable connectionConnector solder

Normaloperating?

Check B+ 5VOn Main B/D

☞A25Normal

Voltage?

Close

N

N

Check 5v on Power B/DReplace Power B/D or

Replace Main B/D(Power B/D don’t have problem)

☞A21

Check IROutput signal

NormalSignal?

N

Y

Repair/ReplaceIR B/D

N

☞A25

ReplaceMain B/D

Y

Y

N

Check R/C Operation

Normaloperating?

Y

Check & RepairCable connectionConnector solder

Normaloperating?

Close

N Check & ReplaceAssembly status(Key PCB + tool )

☞A25

Check KeyOutput signal

Y

Normaloperating?

Close

N NormalSignal?

Repair/ReplaceLocal switch B/D

N

ReplaceMain B/D

Y



Revised date 10/13

Errorsymptom

10

2009 . 7. 29

2009. 9 .01LED LCD TV

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Check technical information- Fix information- S/W Version

N

Y

Technical information?

Check input signal

Signalinput?

Y

N

External Input andComponent

Recognition error

Check and fix external device/cable

RGB,HDMI/DVI, Optical

Recognition error

Replace Main B/D

Replace Main B/DFix in accordance

with technical information

D. Function errorExternal device recognition error


Revised date 11/13

Errorsymptom


11

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Check location of noise

Identify nose type

Circuit noise

Replace LED drive B/D

Replace LIPS B/D

Mechanical noise

Check location of noise

OR

※ When the nose is severe, replace the module(For models with fix information, upgrade the S/W or provide the description)

OR

※ If there is a “Tak Tak” noise from the cabinet, refer to the KMS fix information and then proceed as shown in the solution manual(For models without any fix information, provide the description)

OR

※ Mechanical noise is a natural phenomenon, and apply the 1st level description. When the customer does not agree, apply the process by stage. ※ Describe the basis of the description in “Part related to nose” in the Owner’s Manual.

E. Noise Circuit noise, mechanical noise

<With LED drive B/D>

<Without LED drive B/D >


Revised date 12/13

Errorsymptom


12

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Replace moduleZoom part with exterior damage

Moduledamage

Cabinetdamage Replace cabinet

Replace remote controllerRemote

controllerdamage

Standdent Replace stand

F. Exterior defectExterior defect


Revised date 13/13

Errorsymptom


13

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Established date

Standard Repair Process Detail Technical Manual

Revised date A1

Error symptom

Content Check LCD back light with naked eye

A. Video error_No video/Normal audio Electronics 6-3

A1

2009 . 7. 29

2009. 9 .01LED LCD TV

Remove back cover Power On Check backlighting at 4 points. Remove back cover Power On Check backlighting at 4 points.

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Electronics 6-3


LED drive B+ 24V measuring method

A. Video error_No video/Normal audio A2

Established date

Revised date

Error symptom

Content

A2

Measure DC 24V applying to LED drive B/D from Power Board.

Output 24V from Power Board -> supply to LED drive B/D.Check Pin contacting statement and connection statement.

LED drive B/D

POWER BOARD

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Electronics 6-3


Check LED drive B/D supply voltage


Established date

Revised date

Error symptom

Content

A3

Check each voltage output (5.2V,12V,24V) from power board.

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Entry method

1. Press the ADJ button on the remote controller for adjustment.

2. Enter into White Balance of item 6.

3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD.

Electronics 6-3


Check White Balance value


Established date

Revised date

Error symptom

Content

A4

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Electronics 6-3


Check LED drive B/D supply voltage


Established date

Revised date

Error symptom

Content

A5


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Check MENU - SETUP - Diagnostics - Signal Strength / Quality

When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.)


TUNER input signal strength checking method

A. Video error_Video error, video lag/stop

A6

Established date

Revised date

Error symptom

Content

Electronics 6-3

A6

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LED LCD TV Version checking method


1. Checking method for remote controller for adjustment

Press the IN-START with the remote controller for adjustment

Version

A7

Established date

Revised date

Error symptom

Content

Electronics 6-3

A7

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LED LCD TV connection diagram (1)

A. Video error _Vertical/Horizontal bar, residual image, light spot

A8

Established date

Revised date

Error symptom

Content

Electronics 6-3

A8

2009 . 7. 29

As the part connecting to the external input, check the screen condition by signal

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Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the MAIN BOARD.


TUNER checking part


A9

Established date

Revised date

Error symptom

Content

Electronics 6-3

A9

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Check Link Cable (LVDS) reconnection condition

A. Video error_Color error

A10

Established date

Revised date

Error symptom

Content

Electronics 6-3

A10

Link Cable Contacting Statement Check Area

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Adjustment Test pattern - ADJ Key


You can view 6 types of patterns using the ADJ Key

Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..)4.Video error (Classification of MODULE or Main-B/D!)

A11

Established date

Revised date

Error symptom

Content

Electronics 6-3

A11

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LED LCD TV connection diagram (1)

A. Video error _Vertical/Horizontal bar, residual image, light spot

A12

Established date

Revised date

Error symptom

ContentLED LCD TV

Electronics 6-3

A12

2009 . 7. 29

As the part connecting to the external input, check the screen condition by signal

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Check Link Cable (LVDS) reconnection condition


A13

Established date

Revised date

Error symptom

Content

Electronics 6-3

A13

Link Cable Contacting Statement Check Area

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Adjustment Test pattern - ADJ Key


You can view 6 types of patterns using the ADJ Key

Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..)4.Video error (Classification of MODULE or Main-B/D!)

A14

Established date

Revised date

Error symptom

Content

Electronics 6-3

A14

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Check front display LED

B. Power error _No powerA2

Established date

Revised date

Error symptom

Content

Electronics 6-3

A15

ST-BY Statement : Red Power ON Statement : White

Led Color Difference

Mechanical Button

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Check power input voltage and ST-BY 5V


Established date

Revised date

Error symptom

Content

Electronics 6-3

A16

Power Check Method

1. Check AC220V Input at Power Code.2. Check for Mechanical S/W ON/OFF.3. Check for connection area and FUSE breaking going to Power

Board

①

②

③

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Checking method when power is ON


Established date

Revised date

Error symptom

Content

Electronics 6-3

A17

Check Method at Power ON

1. Check ST-BY DC 5V Output Voltage at Power Board. 2. Check Power On High Voltage (about more than DC1.8) to Power Board

1

2

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Standard Repair Process Detail Technical ManualB. Power error _No power

A18

Established date

Revised date

Error symptom

Content

Electronics 6-3

A18


POWER BOARD voltage measuring method 2009. 9 .01LED LCD TV

2009 . 7. 29

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Standard Repair Process Detail Technical ManualB. Power error _No power

A19

Established date

Revised date

Error symptom

Content

Electronics 6-3

A19

Checking mechanical button at bottom or back side

If the mechanical button is selected 'OFF', TV doesn't turn on as well as power led offThis button is applied for saving power consumtion at ST-BY status.

Therefore the position(On or Off) of this mecanical button must be checked before repairingas no power problem.

Mechanical Button

On

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Entry method

1. Press the IN-START button of the remote controller for adjustment

2. Check the entry into adjustment item 3


POWER OFF MODE checking method

B. Power error _Off when on, off whiling viewing

A15

Established date

Revised date

Error symptom

Content

Electronics 6-3

A20

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POWER BOARD PIN voltage checking method

B. Power error _Off when on, off whiling viewing

A21

Established date

Revised date

Error symptom

Content

Electronics 6-3

A21


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Checking method1. Press the MENU button on the remote controller

2. Select the AUDIO function of the Menu

3. Select TV Speaker from Off to On


Checking method in menu when there is no audio

C. Audio error_No audio/Normal video

A16

Established date

Revised date

Error symptom

Content

Electronics 6-3

A22

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Voltage and speaker checking method when there is no audio

C. Audio error_No audio/Normal video

A23

Established date

Revised date

Error symptom

Content

Electronics 6-3

A23

Check Procedure at No Sound

① Check 24V connector contacting point statement of main board.

② Measure 24V input voltage supplied by Power Board (remove connector and check it out if there is no input voltage)

③ Put SPK terminal into tester RX1 -> when touching GND and output terminal, if make CheukCheuk sound, it is OK.

① ②③

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Check Procedure at No Sound

① ② ③

① 24V connector contacting statement of Main Board.

② Measure 24V of input voltage supplied by Power Board (If there is no input voltage, remove connector -> check it out)

③ Put SPK terminal into tester RX1 -> when touching GND and output terminal, if make CheukCheuk sound, it is OK.


A24

Established date

Revised date

Error symptom

Content

Electronics 6-3

Voltage and SPK Check Method at Sound Defect

C. Audio error_Sound distortion/cut

A24

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Remote controller operation checking method

D. Function error_ No response in remote controller,key error

A18

Established date

Revised date

Error symptom

Content

Electronics 6-3

A25

Check Procedure

1. Check DC5V (P402 PIN #6) onto 5V_ST Terminal

2. When checking Pre-Amp at Power On Statement, If an indicator of analogue tester is moving a little, It is OK. But If not, it is Pre-Amp defect.(P402 PIN #8)

Input voltage terminal : 5V_ST, The remote receiving terminal : IR

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The method for checking T-Con B'd

E. Module & T-Con Board Picture

A19

Established date

Revised date

Error symptom

Content

Electronics 6-3

A26

T-Con Board

1) First of all replace T-Con B'd when abnormal displaying in case LGD module

2) Replace module when abnormal displaying constantly after exchanging T-Con B'd

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Solder defect, CNT Broken

T-Con Defect, CNT BrokenT-Con Defect, CNT BrokenT-Con Defect, CNT Broken

Solder defect, CNT Broken Solder defect, CNT Broken

Solder defect, CNT Broken Solder defect, CNT Broken Abnormal Power Section

Solder defect, Short/Crack Abnormal Power Section Solder defect, Short/Crack

Appendix : Exchange T-Con Board (1)

A - 1/5www.te

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Abnormal Power Section Solder defect, Short/CrackAbnormal Power Section

Solder defect, Short/Crack Fuse Open, Abnormal power section

NoiseGRADATION GRADATION

Abnormal Display

Appendix : Exchange T-Con Board (2)

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Appendix : Exchange LED drive Board

No Light Dim Light

Dim Light Dim Light

No picture/Sound Ok

A - 3/5www.te

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Appendix : Exchange the Module (1)

Panel Mura, Light leakage Press damage

CrosstalkCrosstalk Press damage

Panel Mura, Light leakage

Press damage

A - 4/5

Un-repairable CasesIn this case please exchange the module.

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-mag

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Vertical BlockSource TAB IC Defect

Horizontal BlockGate TAB IC Defect

Gate TAB IC Defect Gate TAB IC Defect

Vertical LineSource TAB IC Defect

Vertical BlockSource TAB IC Defect

Horizontal BlockGate TAB IC Defect

Horizontal lineGate TAB IC Defect

Gate TAB IC DefectHorizontal BlockGate TAB IC Defect

Appendix : Exchange the Module (2)

A - 5/5

Un-repairable CasesIn this case please exchange the module.

www.telev

ision

-mag

azine

.co.uk

LED LCD TV Repair Guide

Documents

Transcript of LED LCD TV Repair Guide