TV Repair Guide LCD

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Short Description

Guia de reparacion de TV LCD...

Description

APORTADO POR:

LCD Television Repair Guide Handbook

General

1. ‘13 LCD TV layout structure Overview

JUAN CARLOS RODRIGUEZ

Driver Board Power Board

Main Board

Woofer Speaker

Local Key

T con Board

WiFi Board

IR

RF Board

1

Repair Method by Symptoms

3-1. No Power Check(Flow Chart)

☞Page 5

☞Page 6~7

Check Front Display LED light Status

Power LED On?

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

“DC Power on” by pressing Power Key with Remote controller

Y

Operation OK?

N

Measure voltage “Power On” line with Tester

Voltage OK? N (3.3V)

Replace Power B/D

Y

N

Check Power cord was inserted properly

Replace Main B/D Y Measure voltage for each output of Power B/D Voltage OK? (3.5V)

inserted properly OK?

Y

N N Voltage OK? (12V,3.5V)

※ Check ST-BY 3.5V Measure votage 3.5V pin with Tester

Close

Y

Replace Main B/D

N



☞Page 6~7 Replace Power B/D

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

Replace Power B/D

Output

Voltage Variable range

3.5V 3.325V~3.675V (ST-BY) 12V 11.4~12.6V 24V 21.6V~27V 2

Repair Method by Symptoms Direct LED Power Board

3-2. No Power Check(check method) 1. 2. 3. 4.

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

JC

24 Pin (Power Board ↔ Main Board)

3.3V

Edge LED Power Board

JCR

3.5V

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)

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-Dim LED : N.C

21

12V

22

PWM Dim #1

24

Error-out

23

N.C • Lamp SCANNING Model: PWM Dim #2

The “LED” refers only to the type of lighting source used to illuminate the LCD pixels in the television 1. 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

Repair Method by Symptoms

3-2. No Power Check(Check method) 24 Pin (Power Board ↔ Main Board)

`13 Model LA Series

Direct LED Power Board

3.3V

JCR Edge LED Power Board

3.5V

1

Power on(3.3V)

2

Inverter On/off(3.3V)

3

ST-BY(3.5V)

4

PWM Dim #1

5

ST-BY(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 18 Pin (Power Board ↔ Main Board)

1

Power on(3.3V)

2

Inverter On/off

3

ST-BY(3.5V)

4

PWM Dim #1

5

ST-BY(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

4

Repair Method by Symptoms

3-3. No Power Check(Power Pin Description)

Pin No.

Items

Description of service and functions

24

ERROR

23

NC

22

P-DIM

The CPU automatically adjusts the brightness, based on the wave pattern of elements communicated (for each picture mode)

20

A-DIM

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

18

INV ON/OFF

17,19,21

12V

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

1

Power On

The Inverter or HV signals whether the Lamp Turn-on functions normally Null terminals

Signals for Inverter, controlled by MICOM Power Supply to Main Board/Module

Sound IC B+ Voltage A Voltage required to turn Multi Voltages ON, Input by MICOM(Voltage: 3.3V) 5

Repair Method by Symptoms

4-1. No Picture Check(Flow Chart)

Case1. No Picture with audio working condition Case2. No Picture with audio not working condition 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,,,) ☞Page 10~12 No Picture Case 1

Sound Working properly

Check Back Light whether “On ”or off with naked eye

Y

N

Back light “On”

Y

Check Power Board 12V, 3.5V line

Check Voltage 12V, 3.5V

N

Y

Replace module

N

Check Power Board 24v output No Picture with Sound not working conditon

Repair Power Board or parts

Case 2 Voltage OK?

Y

Replace Inverter or module End

N Repair Power Board or parts

☞Page 10~12 Check Power Board 3.5V,12V,24 line

Voltage OK? N Replace Power Board

Y

Check and replace MAIN B/D

Output End

Voltage Variable range

3.5V 3.325V~3.675V (ST-BY) 12V 11.4~12.6V 24V 21.6V~27V 6

Repair Method by Symptoms

4-2. No Picture Check(Check Power Pin) Screen (LK, LW)

JUAN CARLOS RODRIGUEZ

Check the DC 24V, 12V, 3.5V 24 Pin (Power Board ↔ Main Board) - 공통

NC 12V 12V 12V GND GND 3.5V 3.5V GND GND 24V ON/OFF

ERROR P-DIM A-DIM INVON GND GND 3.5V 3.5V GND GND 24V 24V





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)

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

A-Dim

21

12V

22

PWM Dim

23

N.C (only Lamp SCANNING Model : PWM Dim #2)

24

Error-out

7

Repair Method by Symptoms

4-2. No Picture Check(Check Power Pin) Screen (LM)



Check the DC 24V, 12V, 3.5V

Direct LED Power Board

24 Pin (Power Board ↔ Main Board) - 공통

24V

JCR

3.5V

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)

11

ST-BY(3.5V)

12

ST-BY(3.5V)

13

GND

14

GND

15

GND

16

N.C (Only LPB : V-sync)

17

12V

18

Inverter On/off

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

12V 8

Repair Method by Symptoms

4-2. No Picture Check(Check Power Pin) Screen (LA)

JUAN CARLOS RODRIGUEZ Check the DC 24V, 12V, 3.5V Direct LED Power Board

18 Pin (Power Board ↔ Main Board)

24 Pin (Power Board ↔ Main Board) 1

Power on

2

Inverter On/off

1

Power on

2

Inverter On/off

3

3.5V

4

PWM Dim #1

3

3.5V

4

PWM Dim #1

5

3.5V

6

PWM Dim #2

5

3.5V

6

PWM Dim #2

7

GND

8

GND

7

GND

8

GND

9

24V

10

24V

9

24V

10

24V

11

GND

12

GND

11

GND

12

GND

13

12V

14

12V

13

12V

14

12V

15

12V

16

24V

15

12V

16

24V

17

GND

18

GND

17

GND

18

GND

19

GND

20

GND

21

GND

22

L/DIMO_VS

23

L/DIM0_MOSI

24

L/DIM0_SCLK

9

Repair Method by Symptoms

4-3. No Picture Check(Check LED Driver 24V )

Check the DC 24V and Inverter on Direct LED Power Board

Edge LED Power Board

P202

P203

1~5

24V

1~5

12V

6~10

GND

6~10

GND

11

Error

12

Inverter ON( 3.3V)

13

A-dim

14

P-dim

10

Repair Method by Symptoms

5-1. No Sount Check(Flow Chart)



☞Page 15~16 No sound

Check User menu  speaker off

Speaker Off

N

Check Voltage (24V)

Check audio B+ 24V of Power Board

Y

N

Replace Power Board

Cancel OFF

Check Speaker Cable Disconnection

Y

N Disconnection

Replace main Board

End

Y

Replace Speaker

11

Repair Method by Symptoms

5-2. No Sount Check(Troubleshooting) ‘13 LA Series

Main Board Power Board



24 Pin (Power Board ↔ Main Board) Power on INV ON 1 2 3.5V PDIM#1 3 4 3.5V PDIM#2 5 6 GND GND 7 8 24V 24V 9 10 GND GND 11 12 12V 13 12V 14 24V 15 12V 16 GND 17 GND 18



JUAN CARLOS RODRIGUEZ

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)

12

Repair Method by Symptoms

6. Picture Error Check(Flow Chart)

Vertical/Horizontal bar, residual image, light spot

6. Picture Error

Board Check method Replace Module

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

☞Page 62

☞ Page 31 Screen OK? N Replace module

Y

Check external device connection condition

Y Good? N Request repair for external device

Check and replace Link Cable

N Screen OK? Y End

N

Replace Main B/D

Screen OK? Y End

Check Test pattern

13

Repair Method by Symptoms Category

Main B/D

Main B/D

Main B/D

Main B/D

Items

IC

IC

IC

IC

Failure

Picture distortion

Picture distortion

Picture distortion

Picture distortion

7-1. Sysmptoms List(Main Board) Cause

Conditions

Failure in I2C communication between MICOM and Main IC

Picture occasionally cracked by the soldering on Main IC

Picture cracking due to poor soldering on Main IC

R-color noise caused by poor soldering on Main IC

14

Repair Method by Symptoms Category

Main B/D

Main B/D

Main B/D

Main B/D

Items

IC

IC

Failure

Picture distortion

Picture distortion

IC

Static screen

IC

No sound

7-1. Sysmptoms List(Main Board) Cause

Conditions

Mosaics generated from poor inside Main IC

Picture cracking from poor service of an element inside Main IC

Screen frozen from a poor feature in Main IC

No sound due to a poor feature in Audio IC

15

Repair Method by Symptoms

7-1. Sysmptoms List(Main Board)

Category

Items

Failure

Speaker

Poor

Noise in

Cable

processing

sound

Speaker

Poor

Noise in

System

processing

sound

Speaker

Poor

Noise in

System

processing

sound

of alien materials into Speaker System

Picture

Picture cracking around the contour from

FFC Cable

Poor contact

cracking

Cause

Conditions

A “woong ~” sound from the right Speaker caused by a speared damage in Sound Cable

A noise and vibration produced from influx of alien materials into Speaker System

A noise and vibration produced from influx

poor contact between FFC Cable PINs

16

Repair Method by Symptoms Category

Items

Failure

Module

Panel

Vertical bars

Module

Panel

Vertical bars

Module

Panel

Vertical bars

Module

Panel

Dark screen

7-2. Sysmptoms List(Module) Cause

Conditions

Vertical bars caused by a irregular feature in the Panel

Vertical bars caused by a irregular feature in the Panel

Vertical bars caused by a irregular feature in the Panel

Screen getting partially dark by a defect inside the Panel

17

Repair Method by Symptoms Category

Items

Failure

7-2. Sysmptoms List(Module) Cause

Conditions

Screen getting partially dark by a failure in Module Driver B/D

Dark screen MODULE DRIVER B/D

Module

Vertical bars

Panel

Vertical bars caused by a poor feature in the Panel

1/3 part of Screen (left/center/right) getting 1/3 part of dark due to a defective feature in Driver Module Driver B/D Screen getting B/D dark

Influx of alien materials into the Module Module

Panel

Alien materials during the assembling process

18

Repair Method by Symptoms Category

Module

Items

Failure

7-2. Sysmptoms List(Module) Cause

Conditions

Connector 1/2 of Picture Picture cracking from contamination by s

cracking

Module

Panel

Dark screen

Module

Panel

Vertical bars

Module

Panel

Vertical bars

foreign materials inside a connector

Screen getting dark from a defect in LED unit inside the Panel

Vertical bars caused by a defective feature in the Panel

Vertical bars caused by a defective feature in the Panel

19

Repair Method by Symptoms Category

Items

Module

Panel

Module

Panel

Module

Panel

Processi ng failure

Processing failure

Failure

7-2. Sysmptoms List(Module) Cause

Conditions

Screen partially Screen partially getting too bright from a too bright failure in LED inside the Panel

Alien materials inside

Moisture inflow into the product

Film separation Film separation from defective processing

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

20

Repair Method by Symptoms Category

T-Con B/D

T-Con B/D

T-Con B/D

T-Con B/D

Items

EOS

EOS

EOS

IC

Failure

Vertical bars evenly spaced

Vertical bars evenly spaced

Picture distortion

Picture distortion

7-2. Sysmptoms List(Module) Cause

Conditions

Damage in Electrical Over Stress

Damage in Electrical Over Stress

Poor features in T-CON

Picture cracking from a poor feature in T-CON IC

21

Repair Method by Symptoms Category

T-Con B/D

T-Con B/D

T-Con B/D

T-Con B/D

Items

IC

IC

IC

IC

7-2. Sysmptoms List(Module)

Failure

Cause

Picture

Picture cracking from a poor feature in 3D

distortion

Picture distortion

Picture distortion

Picture distortion

Conditions

Formatter IC

Picture cracking from contamination around 3D Formatter IC

Picture cracking from an error in Boot Data

Picture cracking from an error in Boot Data

22

Repair Method by Symptoms Category

T-Con B/D

T-Con B/D

Items

IC

IC

7-2. Sysmptoms List(Module)

Failure

Cause

Picture

Picture cracking due to desquamation of

distortion

Picture distortion

Conditions

FRC IC

Picture cracking due to desquamation of FRC IC

23

Repair Method by Symptoms

7-3. Sysmptoms List(LVDS Cable)

Category

Items

Failure

Cause

LVDS

Poor

Picture

Picture cracking along the contour from

Cable

contact

distortion

poor contact between LVDS Cable PINs

LVDS

Poor

Picture

Cable

contact

distortion

LVDS

Poor

Picture

Picture cracking along the contour from

Cable

contact

distortion

poor contact between LVDS Cable PINs

Conditions

Picture cracking from poor contact between LVDS Cable PINs

24

Repair Method by Symptoms Category

Items

Failure

FFC

Poor

Picture

Cable

contact

distortion

7-3. Sysmptoms List(FFC Cable, Cabinet, etc) Cause

Conditions

Picture cracking along the contour caused by poor contact between FFC Cable Pins

Processi Processing Shipment With the Shipment setting inapplicable, ng failure failure setting failure Shipment is made only in a control mode

Cabinet

Cabinet

ICM Filter

Desquamation Some space made Inside from tear-off of of ICM Filter ICM Filter caused by a external shock

Vibration and Speakers shaking from some damage in Damage noise in the Cabinet Speaker Boss Speaker System

25

Repair Method by Parts

Mosaic Patterns

8. Main Board Check (Symptoms)

Picture Distortion

Picture Smear 26

Repair Method by Parts

8. Main Board Check (One-Point Repair)

1. Symptoms : Screen color smearing intermittently 2. Cause of failure : Link cable contact fault



JCR

1. Check RGB pattern with ‘ADJ Key through SVC Remote 2. Link cable by gently tapping the contact area on the symptoms of hand Checked 3. Link cable disassembly and re-assemble 4. Check whether the screen display is normal.

Color smearing

27

Repair Method by Parts

8. Main Board Check (One-Point Repair)

1. Symptoms : Auto Power On/Off 2. Cause of failure : Main board failure

1.Press Button ‘In-Start Mode’ Key 2.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

28

Repair Method by Parts

9. Module Check(One Point Repair)

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.

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

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

P VCC

 JCR

VDD VCC VGL VGH

PANEL VCC : F1 or C1(12V) VDD : C239 (16V)

A failure condition

 JCRL

VCC : C215 (3.3V)

VGL : C251 (-6V)

VGH : R271 (28V)

Output voltage of US1 29

 J.CARLOS RODRIGUEZ

Repair Method by Parts 1.Title: No Display (Only BackLight)

9. Module Check(One Point Repair)

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

- 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 VDD

P701

VCC P VCC

VGH

VG L

No picture (Only backlight)

A failure condition

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

Input voltage of LVDS

VCC : D403 (3.3 V) VGH : D400 (27V)

VDD : D402 (16V) VGL : C450 (-5V)

Output voltage of IC 401 output

30

Repair Method by Parts

10-1. Wi-Fi Check(Flow Chart)

Wi-Fi operating error

9. Wi-Fi Operating Checking(Flow Chart)

☞Page 34

Check the INSTART menu

Wi-Fi Mac value is “NG”?

N

Check the Wifi wafer Pin no.1

Normal Voltage 3.3V

Replace Main B/D

N

Y

Y Check & Repair Wifi cable connection

Close

Pin map Wi-Fi Mac value is “NG”?

Y Change the Wifi assy

N

Close

PIN

USB interface

1

Vcc(3.3V)

2

DM

3

DP

4

GND

5

WOW

6

NC 31

Repair Method by Parts

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

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 replacement 2. Check the wi-fi Version at INSTART menu - Wi-Fi MAC and IP Address normal check connections from main to Wi-Fi module

32

Repair Method by Parts

11. Camera Check(Flow Chart/Troubleshooting)

10. Camera Operating Checking(Flow Chart) Camera Operating Error Check the INSTART menu

Camera Ver. is “NG”?

N

Check the Camera wafer P4200 (pin no.2)

Y

N

Replace Main B/D

Y

Close

Check & Repair Camera cable connection

Camera Ver. is “NG”?

Check Voltage (3.3V)

N

Close

Y

Change the Camera assy

33

Repair Method by Parts

Check the INSTART menu

RF Receiver ver is “00.00”?

N

12-1. Magic Remote Check(Flow Chart)

Check M-Remote itself Operation

Y

Press the ‘wheel’

N

Replace RF assy Cable

* INSTART MENU15.RF Remocon Test3. Firmware download

Close

Press the wheel

Close

Check & Replace Batterry of M-Remote

☞Page 50

Y Down load the Firmware

Turn off/on the set

Is it shown ‘ok’ N message?

Y

N

Y

Check RF assy connection

Normal Operating?

Normal Operating?

Y

Close

Press the ‘back’ and ‘home’ key at the same time about 5sec

N

Is it shown ‘ok’ message?

Y N Close Replace M4

Close

34

Repair Method by Parts

12-2. Magic Remote Check(Pairing/Un Pairing)

RF Pairing/Un-Pairing Method Method

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.

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

Description ▶When pairing, the remote should make a pairing request 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 should blink for some time and TV sends "pairing success pack" back to TV. ▶When remote try's to un-pair, it doesn't care about state of receiver(stand alone).

▶When remote try's to un-pair, it doesn't care about state of receiver(stand alone). ▶After un-pairing, all pairing information should be erased. ▶After un-pairing, LED should blink 3times. ▶The remote just becomes active only in IR mode control function.

35

Repair Method by Parts

12-3. Magic Remote Check(Register/Unregister) To Register Magic Remote

‘13 models -Back/Smart keys

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.

To bring up cursor, simply move remote around. Maximum communication distance:10m or 32.8ft

Unregister Magic Remote Control • M4 Remote

MR13P Remote

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 36

Repair Method by Parts

13. Remote Control Check(Flow Chart)

Remote control(R/C) operating error

☞Page 52~55 Check R/C itself Operation

Operating OK?

Y

Check & Repair Cable connection Connector solder

N Check R/C Operating When turn off light in room

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

☞Page 52~55 N Operating OK? Y Close

Check & Replace Baterry of R/C

Y Operating OK? N

Replace Main B/D

Check B+ 3.5V On Main B/D

☞Page 52~55 Y Voltage OK?

☞Page 10~12

Check IR Output signal

N

Check 3.5v on Power B/D Replace Power B/D or Replace Main B/D (Power B/D don’t have problem)

Normal Signal?

Y

N

Repair/Replace IR B/D

Close

Replace R/C

37

Repair Method by Parts

13-2. Remote Control Check(Troubleshooting)

Main Board

③ ④

1 2 3 4 5 6 7 8

P4101 GND KEY1 KEY2 +3.5V_ST GND LOGO/LED_R IR GND

② ①

1.2. Check IR cable condition between IR & Main board. 3. Check the st-by 3.5V on the pin no.4 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.

38

Repair Method by Parts

13-2. Remote Control Check(Troubleshooting)

Main Board



1 2 3 4 5 6 7 8

P4800 3.3V GND RX TX RESET DC DD GND



 JCR ②

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

39

Repair Method by Parts

13-2. Remote Control Check(Troubleshooting)

Main Board





1 2 3 4 5 6 7 8

P4002 GND KEY1 KEY2 +3.5V_ST GND LED +3.5V_ST GND

① ②

 JCR

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.

40

Adjustments method after Repair Error symptom

Content

Video Error Color error

Adjustment Test pattern - ADJ Key

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

You can view 6 types of patterns using the ADJ Key Checking item:

B/D!)

1. 2. 3. 4.

Defective pixel Residual image MODULE error (ADD-BAR, SCAN BAR) Video error (Classification of MODULE or Main41

Adjustments method after Repair Step 1. Check full model name of your TV(Select one)

- Press(MENU) key on remot - Press((Red) “Customer Support” key on remote - Select “Produce/Service Info” - Check “Model/Type”

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

a. Check a label on TV(Side or Rear)

b. Check menu(Non-Smart TV model)

17. Software Upgrad method with USB Memory

 JCR d. Select “Start” if “TV Software Upgrade” Pop-up appears e. Save the software in “LG_DTV” folder. Make sure file is unzipped before placing in Folder f. Insert USB memory drive into USB port on TV Note) If current software on TV is same with or newer than That on USB drive, TV software Upgrade menu won’t be opend (Some USB memory devices may not be compatible with TV)

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

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 displayed TV will restart automatically in 5 sec, than TV is ready to use

42

Course title Category

LCD TV Repair Guide Handbook □ Leadership

□ Marketing

□ Sales

□ 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

■ CS

※ 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.

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