tv repair guide lcd

LCD TelevisionRepair Guide Handbook

REX

Texto tecleado

APORTADO POR:

Woofer Speaker

Power Board

Main Board

Driver Board

General 1. ‘13 LCD TV layout structure Overview

JUAN CARLOS RODRIGUEZ

1

T con Board

Local Key

IRWiFi

Board RF Board

Power LEDOn?

Y

N Y

N

Check Power cordwas inserted properly

ReplacePowerB/D

Measure voltage for each output of Power B/D

N

Replace Main B/D

Y

- Stand-By: Red light or Turn Off- Power on Condition: Turn Off

OperationOK?

Voltage OK?(3.5V)

Voltage OK?(3.3V)

☞Page 6~7Measure voltage“Power On” linewith Tester

“DC Power on”by pressing Power Keywith Remote controller

CheckFront DisplayLED light Status

☞Page 5

Repair Method by Symptoms 3-1. No Power Check(Flow Chart)

2

N

Y Replace Main B/D

N

Y

Replace Power B/D

N

Replace Power B/D

※

insertedproperly

OK?

Voltage OK?(3.5V)

Voltage OK?(12V,3.5V)

Close☞Page 6~7

-DC Power on: Switch on the TV with local key or remote controller-AC Power on: Switch on the TV with power supply(outlet)

Check ST-BY 3.5VMeasure votage3.5V pin with Tester

<Power Pin Voltage Spec>

Output VoltageVariable range

3.5V(ST-BY) 3.325V~3.675V

12V 11.4~12.6V24V 21.6V~27V

Check the ST-BY(3.5V) and Power on(3.3V)

24 Pin (Power Board ↔ Main Board)

1 Power on(3.3V) 2 24V

3 24V 4 24V

5 GND 6 GND

7 GND 8 GND

9 ST-BY (3.5V) 10 ST-BY (3.5V)

Direct LEDPower Board

<Check Power on (3.3V) and ST-BY(3.5V)> 1. Power Sequence : AC IN→ST-BY3.5V→P-ON→12V,24V→INV ON2. ST-BY3.5V: Power Board → Main Board Micom IC/Power LED /IR Voltage3. 24V: Power Board → Main Board Sound IC /LED Driver Voltage4. 12V: Power Board → Main Board /Module Voltage

3.3V

Repair Method by Symptoms 3-2. No Power Check(check method)

JC

3

9 ST-BY (3.5V) 10 ST-BY (3.5V)

11 ST-BY (3.5V) 12 ST-BY (3.5V)

13 GND 14 GND

15 GND 16 GND

17 12V 18 Inverter On/off

19 12V 20 Lamp : A-DimLED : N.C

21 12V 22 PWM Dim #1

23 N.C• Lamp SCANNINGModel: PWM Dim #2

24 Error-out

Edge LEDPower Board

The “LED” refers only to the type of lighting source used to illuminate the LCD pixels in the television1. Direct LED: Direct type term refers to televisions that use a full panel of LEDs to illuminate the pixels.2. Edge LED: Edge LED,means the LEDs that illuminate the pixels are located only on the edges of the set.

3.5V

JCR

`13 Model LA Series 24 Pin (Power Board ↔ Main Board)

1 Power on(3.3V) 2 InverterOn/off(3.3V)

3 ST-BY(3.5V) 4 PWM Dim #1


7 GND 8 GND

9 24V 10 24V

11 GND 12 GND

13 12V 14 12V

15 12V 16 24V

17 GND 18 GND

<Check Power on (3.3V) and ST-BY(3.5V)>


3.3V

Repair Method by Symptoms 3-2. No Power Check(Check method)

4

17 GND 18 GND

19 GND 20 GND

21 GND 22 L/DIMO_VS

23 L/DIM0_MOSI 24 L/DIM0_SCLK18 Pin (Power Board ↔ Main Board)

1 Power on(3.3V) 2 Inverter On/off



7 GND 8 GND

9 24V 10 24V

11 GND 12 GND

13 12V 14 12V

15 12V 16 24V

17 GND 18 GND

Edge LEDPower Board

3.5V

JCR

Pin No. Items Description of service and functions

24 ERROR The Inverter or HV signals whether the Lamp Turn-on functions normally

23 NC Null terminals

22 P-DIM The CPU automatically adjusts the brightness, based on the wave pattern ofelements communicated (for each picture mode)

20 A-DIM The CPU customizes the brightness of Lamp as to each different brightness ofpicture (a serial current wave)

Repair Method by Symptoms 3-3. No Power Check(Power Pin Description)

5

The CPU customizes the brightness of Lamp as to each different brightness ofpicture (a serial current wave)

18 INV ON/OFF Signals for Inverter, controlled by MICOM

17,19,21 12V Power Supply to Main Board/Module

15,16 GND

13,14 GND

11,12 3.5V ST-BY

9,10 3.5V ST-BY

7,8 GND

5,6 GND

2,3,4 24V Sound IC B+ Voltage

1 Power On A Voltage required to turn Multi Voltages ON, Input by MICOM(Voltage: 3.3V)

Y

N

Y

N

Y

N

Replace module

Repair PowerBoard or parts

Check Power Board 24v output

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

Case1. No Picture with audio working conditionCase2. No Picture with audio not working condition

☞Page 10~12Sound

Workingproperly

Back light“On”

CheckVoltage

12V, 3.5V

Check Back Lightwhether “On ”or offwith naked eye

Check PowerBoard 12V, 3.5Vline

No Picture

Case 1

No Picture with Soundnot working conditon

Repair Method by Symptoms 4-1. No Picture Check(Flow Chart)

6

Y Replace Inverteror module

N

Repair PowerBoard or parts

End

Y

Replace PowerBoard

N End

☞Page 10~12

VoltageOK?

Check Power Board3.5V,12V,24 line

Check and replaceMAIN B/D

VoltageOK?

Case 2

No Picture with Soundnot working conditon

<Power Pin Voltage Spec>

Output VoltageVariable range

3.5V(ST-BY) 3.325V~3.675V

12V 11.4~12.6V24V 21.6V~27V

24 Pin (Power Board ↔ Main Board) - 공통


3 24V 4 24V

5 GND 6 GND

7 GND 8 GND

9 ST-BY(3.5V) 10 ST-BY(3.5V)

11 ST-BY(3.5V) 12 ST-BY(3.5V)

Screen (LK, LW)

ERRORP-DIMA-DIMINV-ONGNDGND3.5V3.5VGNDGND24V24V

NC12V12V12VGNDGND3.5V3.5VGNDGND24VON/OFF

Check the DC 24V, 12V, 3.5V

Repair Method by Symptoms 4-2. No Picture Check(Check Power Pin)


7

<LK Series>

<LWSeries>

13 GND 14 GND

15 GND 16 GND


19 12V 20 A-Dim

21 12V 22 PWM Dim

23 N.C(only Lamp

SCANNING Model: PWM Dim #2)

24 Error-out

ERRORP-DIMA-DIMINV-ONGNDGND3.5V3.5VGNDGND24V24V

NC12V12V12VGNDGND3.5V3.5VGNDGND24VON/OFF

24 Pin (Power Board ↔ Main Board) - 공통


3 24V 4 24V

5 GND 6 GND

7 GND 8 GND

9 ST-BY(3.5V) 10 ST-BY(3.5V)

11 ST-BY(3.5V) 12 ST-BY(3.5V)

Screen (LM)<Check power On(3.3V) and DC 24V, 12V, 3.5V>Check the DC 24V, 12V, 3.5VDirect LED

Power Board

24V


8

11 ST-BY(3.5V) 12 ST-BY(3.5V)

13 GND 14 GND

15 GND 16 N.C(Only LPB : V-sync)


19 12V 20 N.C(LPB, Lamp : A-dim)

21 12V 22 PWM Dim #1

23 N.C(only Lamp

SCANNING Model: PWM Dim #2)

24 Error-out

3.5V

24V

12V

JCR

<Check power input voltage and DC 24V, 12V, 3.5V>


1 Power on 2 Inverter On/off

3 3.5V 4 PWM Dim #1

5 3.5V 6 PWM Dim #2


1 Power on 2 Inverter On/off

3 3.5V 4 PWM Dim #1

5 3.5V 6 PWM Dim #2

Screen (LA)

Check the DC 24V, 12V, 3.5V




9

5 3.5V 6 PWM Dim #2

7 GND 8 GND

9 24V 10 24V

11 GND 12 GND

13 12V 14 12V

15 12V 16 24V

17 GND 18 GND

19 GND 20 GND

21 GND 22 L/DIMO_VS

23 L/DIM0_MOSI 24 L/DIM0_SCLK

5 3.5V 6 PWM Dim #2

7 GND 8 GND

9 24V 10 24V

11 GND 12 GND

13 12V 14 12V

15 12V 16 24V

17 GND 18 GND

Direct LEDPower Board P203

1~5 12V

6~10 GND

P202

1~5 24V

6~10 GND

Check the DC 24V and Inverter on

Repair Method by Symptoms 4-3. No Picture Check(Check LED Driver 24V )

10

Edge LEDPower Board

11 Error

12 Inverter ON( 3.3V)

13 A-dim

14 P-dim

No sound N

Y

Cancel OFF

Check audio B+ 24Vof Power Board

Y

N

Replace Power Board

<No Sound with Picture working condition>

SpeakerOff

CheckVoltage

(24V)

☞Page 15~16CheckUser menu speaker off

Repair Method by Symptoms 5-1. No Sount Check(Flow Chart)

11

Cancel OFF Replace Power Board

N

Y

Replace Speaker

EndCheck SpeakerCableDisconnection

Replace main BoardDisconnection

‘13 LA Series

24 Pin (Power Board ↔ Main Board)1 Power on 2 INV ON3 3.5V 4 PDIM#15 3.5V 6 PDIM#27 GND 8 GND9 24V 10 24V11 GND 12 GND13 12V 14 12V15 12V 16 24V17 GND 18 GND

①

②

<No Sound/Picture OK >

Power BoardMain Board

Repair Method by Symptoms 5-2. No Sount Check(Troubleshooting)

12

Checking method(direction) when there is no sound

① Check the contact condition of or 24V connector of Main Board

② Measure the 24V input voltage supplied from Power Board(If there is no input voltage, check the connector)


ScreenOK?

N

YCheck externaldeviceconnectioncondition

Y

N

Check andreplace LinkCable

Good?

Y

NScreenOK? Replace Main B/D

Vertical/Horizontal bar, residual image, light spot

Y

N

ReplaceModule

ScreenOK?

☞ Page 31

6. Picture Error

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

Board Check method

Repair Method by Symptoms 6. Picture Error Check(Flow Chart)

13

Replacemodule

EndRequest repairfor externaldevice

☞Page 62

Y

End

Check Test pattern

Category Items Failure Cause Conditions

MainB/D

ICPicture

distortionFailure in I2C communication betweenMICOM and Main IC

MainB/D

ICPicture

distortionPicture occasionally cracked by thesoldering on Main IC

Repair Method by Symptoms 7-1. Sysmptoms List(Main Board)

14

MainB/D

Picturedistortion

MainB/D

ICPicture

distortionPicture cracking due to poor soldering onMain IC

MainB/D

ICPicture

distortionR-color noise caused by poor solderingon Main IC


MainB/D

ICPicture

distortionMosaics generated from poor insideMain IC

MainB/D

ICPicture

distortionPicture cracking from poor service of anelement inside Main IC


15

MainB/D

Picturedistortion

MainB/D

IC Static screen Screen frozen from a poor feature in MainIC

MainB/D

IC No sound No sound due to a poor feature in Audio IC


SpeakerCable

Poorprocessing

Noise insound

A “woong ~” sound from the right Speakercaused by a speared damage in SoundCable

SpeakerSystem

Poorprocessing

Noise insound

A noise and vibration produced from influxof alien materials into Speaker System


16

SpeakerSystem

Poorprocessing

Noise insound


SpeakerSystem

Poorprocessing

Noise insound


FFCCable

Poor contactPicture

crackingPicture cracking around the contour frompoor contact between FFC Cable PINs


Module Panel Vertical barsVertical bars caused by a irregular featurein the Panel


Repair Method by Symptoms 7-2. Sysmptoms List(Module)

17


Module Panel Dark screen Screen getting partially dark by a defectinside the Panel


Module Driver B/D Dark screenScreen getting partially dark by a failure inMODULE DRIVER B/D

Module Panel Vertical barsVertical bars caused by a poor feature inthe Panel


18

Module Driver B/D1/3 part of

Screen gettingdark

1/3 part of Screen (left/center/right) gettingdark due to a defective feature in DriverB/D

Module Panel Alien materialsInflux of alien materials into the Moduleduring the assembling process


ModuleConnector

s1/2 of Picture

crackingPicture cracking from contamination byforeign materials inside a connector

Module Panel Dark screen Screen getting dark from a defect in LEDunit inside the Panel


19

Module Panel Vertical barsVertical bars caused by a defective featurein the Panel

Module Panel Vertical barsVertical bars caused by a defective featurein the Panel


Module PanelScreen partially

too brightScreen partially getting too bright from afailure in LED inside the Panel

Module PanelAlien materials

insideMoisture inflow into the product


20

Module Panel Film separation Film separation from defective processing

Processing failure

Processingfailure Shipment

setting failureWith the Shipment setting inapplicable,Shipment is made only in a control mode


T-ConB/D

EOSVertical bars

evenly spacedDamage in Electrical Over Stress

T-ConB/D

EOSVertical bars

evenly spacedDamage in Electrical Over Stress


21

T-ConB/D

Vertical barsevenly spaced

T-ConB/D

EOSPicture

distortionPoor features in T-CON

T-Con

B/DIC

Picture

distortion

Picture cracking from a poor feature in

T-CON IC


T-ConB/D

ICPicture

distortion

Picture cracking from a poor feature in 3DFormatter IC

T-ConB/D

ICPicture

distortion

Picture cracking from contaminationaround 3D Formatter IC


22

T-ConB/D

ICPicture

distortion

Picture cracking from an error in BootData

T-ConB/D

ICPicture

distortion

Picture cracking from an error in BootData


T-Con

B/DIC

Picture

distortion

Picture cracking due to desquamation of

FRC IC

T-Con

B/DIC

Picture

distortion


FRC IC


23

T-Con

B/D

Picture

distortion


FRC IC


LVDSCable

Poorcontact

Picturedistortion

Picture cracking along the contour frompoor contact between LVDS Cable PINs

LVDSCable

Poorcontact

Picturedistortion

Picture cracking from poor contactbetween LVDS Cable PINs

Repair Method by Symptoms 7-3. Sysmptoms List(LVDS Cable)

24

LVDSCable

Poorcontact

Picturedistortion

Picture cracking along the contour frompoor contact between LVDS Cable PINs


FFCCable

Poorcontact

Picturedistortion

Picture cracking along the contourcaused by poor contact between FFCCable Pins

Processing failure

Processingfailure

Shipmentsetting failure

With the Shipment setting inapplicable,Shipment is made only in a control mode

Repair Method by Symptoms 7-3. Sysmptoms List(FFC Cable, Cabinet, etc)

25

Cabinet ICM Filter Desquamationof ICM Filter

Some space made Inside from tear-off ofICM Filter caused by a external shock

Cabinet DamageVibration and

noise inSpeaker System

Speakers shaking from some damage inthe Cabinet Speaker Boss

Mosaic Patterns Picture Distortion

Repair Method by Parts 8. Main Board Check (Symptoms)

26

Mosaic Patterns Picture Distortion

Picture Smear

1. Symptoms : Screen color smearing intermittently

2. Cause of failure : Link cable contact fault

<Check Point> <Repiar method>

1. Check RGB pattern with ‘ADJ Key through SVC Remote

2. Link cable by gently tapping the contact area on thesymptoms of hand Checked

3. Link cable disassembly and re-assemble

4. Check whether the screen display is normal.

Repair Method by Parts 8. Main Board Check (One-Point Repair)

JCR

27

Color smearing

1. Check RGB pattern with ‘ADJ Key through SVC Remote

2. Link cable by gently tapping the contact area on thesymptoms of hand Checked

3. Link cable disassembly and re-assemble

4. Check whether the screen display is normal.

1. Symptoms : Auto Power On/Off

2. Cause of failure : Main board failure


1.Press Button ‘In-Start Mode’ Key2.Enter ‘Power Off Status’

1.If there are “POWER_OFF_BY_NO_ POLLING” message

2. Replace the main board

3. Check the condition of Screen

*POWER_OFF_BY_NO_POLLING:If there are no communications between micom and Host

CPU for 15second→ Micom will reboot all system

Repair Method by Parts 8. Main Board Check (One-Point Repair)

28

1.If there are “POWER_OFF_BY_NO_ POLLING” message

2. Replace the main board

3. Check the condition of Screen

*POWER_OFF_BY_NO_POLLING:If there are no communications between micom and Host

CPU for 15second→ Micom will reboot all system

P VCC

* P-VCC: A standard voltage to activate the LCDVCC: Usually 3.3V power required to activate Digital ICVDD: A voltage supplied to Source Drive IC for activation of

LCDVGL/VGH: Voltages required to turn TFT Gate on/off

-VGL: TFT Gate on-VGH: TFT Gate off

1.Title: No Display (Only BackLight or multiple vertical bars)

- Sound Normal/CH Volume Control Normally

2. Applied to: LK, LW57, and 65

3. Troubleshooting: As shown below, inspect the P-VCC(12V) B/D inside T-CON

and US1 output voltage.

Upon an abnormal voltage, open and re-check the FFC leading from T-CON to the Module.

Upon recurrence of a same failure, change T-CON or the Module if the voltage is normal.

(Refer to below Normal Voltage)T-Con Board

Repair Method by Parts 9. Module Check(One Point Repair)

JCR

29

Output voltage of US1

PANEL VCC : F1 or C1(12V) VGL : C251 (-6V)VCC : C215 (3.3V)VGH : R271 (28V)VDD : C239 (16V)

A failure condition

VGH

VCC

VGL

VDD

JCRL

JCR

P701 VDD

* P-VCC: A standard voltage to activate the LCDVCC: Usually 3.3V power required to activate Digital ICVDD: A voltage supplied to Source Drive IC for activation of LCDVGL/VGH: Voltages required to turn TFT Gate on/off

-VGL: TFT Gate on-VGH:TFT Gate off

1.Title: No Display (Only BackLight)

- Sound Normal/CH Volume Control Normally

2.Applied to: LW9500, LW9600, andLW9800

3. Troubleshooting:

Check if Back Light is ON and, if it’s ON, re-check T-CON as the following sequence.

Change the Module if the voltage is normal. Change T-CON if voltage abnormal.

T-Con Board T-Con Board

Repair Method by Parts 9. Module Check(One Point Repair) J.CARLOS RODRIGUEZ

30

Input voltage of LVDS Output voltage of IC 401 output

P VCC : P701 48~51 PIN (12V)

P701

P VCCVCC

VDD

VGH VGL

VCC : D403 (3.3 V) VDD : D402 (16V)VGH : D400 (27V) VGL : C450 (-5V)

A failure condition

No picture (Only backlight)

9. Wi-Fi Operating Checking(Flow Chart)Wi-Fi operating error

Check theINSTART menu

Wi-Fi Mac valueis “NG”?

Y

Check & RepairWifi cable

connection

N Check the Wifi waferPin no.1

Y

N ReplaceMain B/D

Close

NormalVoltage

3.3V

☞Page 34

Repair Method by Parts 10-1. Wi-Fi Check(Flow Chart)

31

Change the Wifiassy

Y

Wi-Fi Mac valueis “NG”?

N

PIN USB interface

1 Vcc(3.3V)

2 DM

3 DP

4 GND

5 WOW

6 NC

Pin mapClose

1. Symptoms : Wi-Fi disconnection

2. Cause of failure : Caused by bad Wi-Fi Module


1. Check the Wi-Fi Version at INSTART menu- Wi-Fi MAC and IP Address to check an abnormal

Inspection

1. Wi-Fi Module replacement2. Check the wi-fi Version at INSTART menu

- Wi-Fi MAC and IP Address normal checkconnections from main to Wi-Fi module

Repair Method by Parts 10-2. Wi-Fi Check(One Point Repair)

32

1. Wi-Fi Module replacement2. Check the wi-fi Version at INSTART menu

- Wi-Fi MAC and IP Address normal checkconnections from main to Wi-Fi module

10. Camera Operating Checking(Flow Chart)Camera Operating Error


Camera Ver.is “NG”?

Y

Check & RepairCamera cable

connection

N Check the Camera waferP4200 (pin no.2)

Y

N ReplaceMain B/D

Close

CheckVoltage(3.3V)

Repair Method by Parts 11. Camera Check(Flow Chart/Troubleshooting)

33

Change theCamera assy

Y

Camera Ver.is “NG”?

N Close

Y

N

CheckM-Remote

itself Operation

Y

Check & ReplaceBatterry ofM-Remote

Press the‘wheel’

N Turn off/on theset


RF Receiver veris “00.00”?

Y

N

Check RF assyconnection N

Close

NormalOperating?

Is it shown ‘ok’message?

Press thewheel

☞Page 50

ReplaceRF assy Cable

Repair Method by Parts 12-1. Magic Remote Check(Flow Chart)

34

N

N

Replace M4

Press the ‘back’and ‘home’ keyat the same time

about 5secY

Down load the Firmware

* INSTART MENU15.RFRemocon Test3. Firmware

download

Y

Check RF assyconnection

Close

CloseNormal

Operating?

Is it shown ‘ok’message?

Y

☞Page 50

Close

Close

ReplaceRF assy Cable

RF Pairing/Un-Pairing Method

Method Description

RF Pairing

1. Method 1- If un-paired, just press "OK"button.- If paired, press "OK" button after un-pairing.2. Method 2(Repairing)- Press "BACK"button for 5 sec.

▶When pairing, the remote should make a pairingrequest IR signal to TV.

▶When TV receive the IR signal, it should send “pairing request packed" to the RF receiver.

▶ After pairing success, the remote LED shouldblink for some time and TV sends "pairingsuccess pack" back to TV.

▶When remote try's to un-pair, it doesn't careabout state of receiver(stand alone).

Repair Method by Parts 12-2. Magic Remote Check(Pairing/Un Pairing)

35

▶When pairing, the remote should make a pairingrequest IR signal to TV.

▶When TV receive the IR signal, it should send “pairing request packed" to the RF receiver.

▶ After pairing success, the remote LED shouldblink for some time and TV sends "pairingsuccess pack" back to TV.

▶When remote try's to un-pair, it doesn't careabout state of receiver(stand alone).

RFUn-Pairing

Depending on Magic remotePress "HOME/SMART" button and "BACK"button at the same time for 5sec.R/C LED blinks 3times after a few sec's.Then un-paired. To re-pair Press OK button.

▶When remote try's to un-pair, it doesn't care aboutstate of receiver(stand alone).

▶After un-pairing, all pairing information should beerased.

▶After un-pairing, LED should blink 3times.▶The remote just becomes active only in IR mode

control function.

‘13 models -Back/Smart keys

To Register Magic Remote

Press the Wheel(OK) button on the remote control

Pop-up message will appear on screen

When Registration completes, another pop-up message will appear.

Repair Method by Parts 12-3. Magic Remote Check(Register/Unregister)

36

M4 Remote MR13P Remote

To bring up cursor, simply move remote around.

Maximum communication distance:10m or 32.8ft

Unregister Magic Remote Control

• Press the “Home” and “Back” on the

remote fo 5 seconds

• The Red LED at the top of the Remote will

blink 3time

• To re-register the Remote, follow first

procedure

Y

N

Remote control(R/C) operating error

Check R/C itselfOperation Operating

OK?

Y

Check R/C OperatingWhen turn off light

in room

Check & ReplaceBaterry of R/C

Check & RepairCable connectionConnector solder

OperatingOK?

Check B+ 3.5VOn Main B/D

☞Page 52~55

VoltageOK?

N

Check 3.5v on Power B/DReplace Power B/D or

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

Check IROutput signal

NormalSignal?

N

Y

Repair/ReplaceIR B/D

N

ReplaceMain B/D

Y

Close

☞Page 52~55☞Page 52~55

☞Page 10~12

Repair Method by Parts 13. Remote Control Check(Flow Chart)

37

OperatingOK?

Replace R/C

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

Check R/C OperatingWhen turn off light

in room

N

Check 3.5v on Power B/DReplace Power B/D or

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

Repair/ReplaceIR B/D

YClose

P41011 GND

2 KEY1

3 KEY2

4 +3.5V_ST

5 GND

6 LOGO/LED_R

7 IR8 GND

②

③

④

①

Main Board

Repair Method by Parts 13-2. Remote Control Check(Troubleshooting)

38

1.2. Check IR cable condition between IR & Main board.3. Check the st-by 3.5V on the pin no.44. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog Tester

needle moves slowly, and defective when it does not move at all.

①

P48001 3.3V

2 GND

3 RX

4 TX

5 RESET

6 DC

7 DD8 GND

①

③

<LM Series>

Main Board


39

Checking order

1, 2. Check Motion cable condition between Motion assy & Main board.3. Check the 3.3V on the pin no. 1.

②

JCR

P40021 GND

2 KEY1

3 KEY2

4 +3.5V_ST

5 GND

6 LED

7 +3.5V_ST8 GND

①

③

④

<LA Series>

Main Board


40

Checking order

1, 2. Check IR cable condition between IR & Main board.3. Check the st-by 3.5V on the pin no 4,7.4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog

Tester needle moves slowly, and defective when it does not move at all.

①

②

JCR

Error symptom Content

Video Error Colorerror

Adjustment Test pattern - ADJKey

Adjustments method after Repair 16. Tool option setting method after main B/D change(adjustment RGB Pattern)

41

You can view 6 types of patterns using the ADJ Key

Checking item: 1. Defective pixel2. Residual image3. MODULE error (ADD-BAR, SCAN BAR)4. Video error (Classification of MODULE or Main-

B/D!)

Step 1. Check full model name of your TV(Select one)a. Check a label on TV(Side or Rear)

b. Check menu(Non-Smart TV model)- Press(MENU) key on remot- Press((Red) “Customer Support” key on remote- Select “Produce/Service Info”- Check “Model/Type”

Step 2. Upgrade TVa. Make a folder “LG_DTV” on USB driveb. Save the software in “LG_DTV” folder. Make sure file is unzipped before placing in Folderc. Insert USB memory drive into USB port on TV

d. Select “Start” if “TV Software Upgrade” Pop-up appearse. Save the software in “LG_DTV” folder. Make sure file is unzipped before placing in Folderf. Insert USB memory drive into USB port on TV

Note)

Adjustments method after Repair 17. Software Upgrad method with USB Memory

JCR

42

b. Check SETUP(Smart TV model)- Press(Home) key on remot- Select “SETUP”- Move to “SUPPORT”- Select “Product/Service info”- Check “Model/Type”

If current software on TV is same with or newer thanThat on USB drive, TV software Upgrade menu won’t be opend(Some USB memory devices may not be compatible with TV)

Note)

Please wait while the update is copied to TV※ Don’t remove USB drive while this message is displayed※ Don’t unplug TV power cord while this message is displayed

Software upgrade in on progress※ Don’t unplug TV power cord while this message is displayed

After the upgrade is completed, this message is displayedTV will restart automatically in 5 sec, than TV is ready to use

Course title LCD TV Repair Guide Handbook

Category□ Leadership □ Marketing □ Sales ■ CS

□ Manufacturing □ Quality □ Biz. administration

Published on 04/01/2014

Developed by HE CS Technology Support Team

Published by Yongsu kim(e-mail: [email protected])

Updated on 11/02/2014

※ No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical,including photocopying, recording, or by any information storage or retrieval system without written permission from LGE.

tv repair guide lcd

Documents

power sequence

power supplyoutletcheck

power checkcheck method417

power checkcheck methodjc39

power checkflow chart2ny

gnd9 st

remote controllerac

24v17 gnd