LG 43LT340C0TB Owner’s Manual

CONFIDENTIAL

LED TV

SERVICE MANUAL

CHASSIS : LB9KB / LG9KB

MODEL : 43LT340C0TB

43LT340C0GB

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL71433001 (1904-REV00)

CONTENTS

CONTENTS .............................................................................................. 2

SAFETY PRECAUTIONS ........................................................................ 3

SERVICING PRECAUTIONS ................................................................... 4

SPECIFICATION ...................................................................................... 6

SOFTWARE UPDATE .............................................................................. 9

BLOCK DIAGRAM ................................................................................. 10

EXPLODED VIEW .................................................................................. 11

DISASSEMBLY GUIDE .......................................................................... 13

TROUBLE SHOOTING GUIDE ................................................ APPENDIX

- 2 -

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Exploded View. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.

General Guidance

An isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks.

It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation.

If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with the specified.

When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1 W), keep the resistor 10 mm away from PCB.

Keep wires away from high voltage or high temperature parts.

Before returning the receiver to the customer,

always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to be sure the set is safe to operate without damage of electrical shock.

Leakage Current Cold Check(Antenna Cold Check)

With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on position, connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1 MΩ and 5.2 MΩ. When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer.

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet.

Do not use a line Isolation Transformer during this check. Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity. Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to

0.5 mA. In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer.

Leakage Current Hot Check circuit

- 3 -

SERVICING PRECAUTIONS

CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the

SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conict between the

following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First.

General Servicing Precautions

1. Always unplug the receiver AC power cord from the AC power source before;

a. Removing or reinstalling any component, circuit board

module or any other receiver assembly.

b. Disconnecting or reconnecting any receiver electrical plug

or other electrical connection.

c. Connecting a test substitute in parallel with an electrolytic

capacitor in the receiver. CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device (DVM, FETVOM, etc) equipped with a suitable high voltage probe. Do not test high voltage by "drawing an arc".

3. Do not spray chemicals on or near this receiver or any of its assemblies.

4. Unless specied otherwise in this service manual, clean

electrical contacts only by applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable non-abrasive applicator; 10 % (by volume) Acetone and 90 % (by volume) isopropyl alcohol (90 % - 99 % strength)

CAUTION: This is a ammable mixture. Unless specied otherwise in this service manual, lubrication

of contacts in not required.

5. Do not defeat any plug/socket B+ voltage interlocks with which receivers covered by this service manual might be equipped.

6. Do not apply AC power to this instrument and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed.

7. Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead. Always remove the test receiver ground lead last.

8. Use with this receiver only the test xtures specied in this

service manual.

CAUTION: Do not connect the test xture ground strap to any

heat sink in this receiver.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES

devices are integrated circuits and some eld-effect transistors

and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by static by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static type solder removal device. Some sol-

der removal devices not classied as “anti-static” can generate electrical charges sufcient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate

electrical charges sufcient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your

foot from a carpeted oor can generate static electricity sufcient to damage an ES device.)

General Soldering Guidelines

1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will maintain tip temperature within the range or 500 °F to 600 °F.

2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead.

3. Keep the soldering iron tip clean and well tinned.

4. Thoroughly clean the surfaces to be soldered. Use a mall wirebristle (0.5 inch, or 1.25 cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners.

5. Use the following unsoldering technique

a. Allow the soldering iron tip to reach normal temperature.

(500 °F to 600 °F) b. Heat the component lead until the solder melts. c. Quickly draw the melted solder with an anti-static, suction-

type solder removal device or with solder braid.

CAUTION: Work quickly to avoid overheating the circuit board printed foil.

6. Use the following soldering technique. a. Allow the soldering iron tip to reach a normal temperature

(500 °F to 600 °F)

b. First, hold the soldering iron tip and solder the strand

against the component lead until the solder melts.

c. Quickly move the soldering iron tip to the junction of the

component lead and the printed circuit foil, and hold it there only until the solder ows onto and around both the component lead and the foil. CAUTION: Work quickly to avoid overheating the circuit board printed foil.

d. Closely inspect the solder area and remove any excess or

splashed solder with a small wire-bristle brush.

- 4 -

IC Remove/Replacement

Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent at against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above.

Removal

1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts.

2. Draw away the melted solder with an anti-static suction-type solder removal device (or with solder braid) before removing the IC.

Replacement

1. Carefully insert the replacement IC in the circuit board.

2. Carefully bend each IC lead against the circuit foil pad and solder it.

3. Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic coating to the areas).

"Small-Signal" Discrete Transistor Removal/Replacement

1. Remove the defective transistor by clipping its leads as close as possible to the component body.

2. Bend into a "U" shape the end of each of three leads remaining on the circuit board.

3. Bend into a "U" shape the replacement transistor leads.

4. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the "U" with long nose pliers to insure metal to metal contact then solder each connection.

Power Output, Transistor Device Removal/Replacement

1. Heat and remove all solder from around the transistor leads.

2. Remove the heat sink mounting screw (if so equipped).

3. Carefully remove the transistor from the heat sink of the circuit board.

4. Insert new transistor in the circuit board.

5. Solder each transistor lead, and clip off excess lead.

6. Replace heat sink.

Diode Removal/Replacement

1. Remove defective diode by clipping its leads as close as possible to diode body.

2. Bend the two remaining leads perpendicular y to the circuit board.

3. Observing diode polarity, wrap each lead of the new diode around the corresponding lead on the circuit board.

4. Securely crimp each connection and solder it.

5. Inspect (on the circuit board copper side) the solder joints of the two "original" leads. If they are not shiny, reheat them and if necessary, apply additional solder.

3. Solder the connections. CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures.

Circuit Board Foil Repair

Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this condition is encountered.

At IC Connections

To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections).

1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper as absolutely necessary).

2. carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern.

3. Bend a small "U" in one end of a small gauge jumper wire and carefully crimp it around the IC pin. Solder the IC connection.

4. Route the jumper wire along the path of the out-away copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped area and clip off any excess jumper wire.

At Other Connections

Use the following technique to repair the defective copper pattern at connections other than IC Pins. This technique involves the installation of a jumper wire on the component side of the circuit board.

1. Remove the defective copper pattern with a sharp knife. Remove at least 1/4 inch of copper, to ensure that a hazardous condition will not exist if the jumper wire opens.

2. Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern.

3. Connect insulated 20-gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side. Carefully crimp and solder the connections. CAUTION: Be sure the insulated jumper wire is dressed so the it does not touch components or sharp edges.

Fuse and Conventional Resistor Removal/Replacement

1. Clip each fuse or resistor lead at top of the circuit board hollow stake.

2. Securely crimp the leads of replacement component around notch at stake top.

- 5 -

SPECIFICATION

NOTE : Specifications and others are subject to change without notice for improvement

.

1. Application range

This specification is applied to the LED TV used LB9KB / LG9KB chassis.

3. Test method

(1) Performance: LGE TV test method followed (2) Demanded other specification

- Safety : CE, IEC specification

- EMC : CE, IEC specification

2. Requirement for Test

Each part is tested as below without special appointment.

(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C (2) Relative Humidity: 65 % ± 10 % (3) Power Voltage : Standard input voltage (AC 100-240 V~,

50/60 Hz), Standard Voltage of each products is marked by models.

(4) Specification and performance of each parts are followed

each drawing and specification by part number in accordance with BOM.

(5) The receiver must be operated for about 5 minutes prior to

the adjustment.

4. Model General Specification

No. Item Specication Remarks

1 Market Asia, Oceania (PAL/DVB Market)

(1) Digital TV : DVB-T/T2, DVB-C

2. Television system

3 Channel Storage ATV / DVB-T/T2 : 2,000EA

4 Television system

(2) Analogue TV : PAL B/B, PAL B/G, PAL D/K,

PAL-I, SECAM B/G, SECAM D/K, NTSC-M

Analog : PAL Digital : DVB

Depending on Model and Country

► DVB-T

- Guard Interval (Bitrate_Mbit/s) : 1/4, 1/8, 1/16, 1/32

- Modulation : Code Rate QPSK : 1/2, 2/3, 3/4, 5/6, 7/8 16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8 64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8

► DVB-T2

- Guard Interval (Bitrate_Mbit/s) : 1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256

- Modulation : Code Rate QPSK : 1/2, 2/5, 2/3, 3/4, 5/6 16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6 64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6 256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6

- 6 -

5. External Input Support Format

5.1. Component input(Y, PB, PR)

No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock Proposed

1 720*576 15.625 50.00 13.5 SDTV ,DVD 576I

2 720*480 15.73 60.00 13.5135 SDTV ,DVD 480I

3 720*480 15.73 59.94 13.50 SDTV ,DVD 480I

4 720*576 31.25 50.00 27.00 SDTV 576P

5 720*480 31.50 60.00 27.027 SDTV 480P

6 720*480 31.47 59.94 27.00 SDTV 480P

7 1280*720 37.50 50.00 74.25 HDTV 720P

8 1280*720 45.00 60.00 74.25 HDTV 720P

9 1280*720 44.96 59.94 74.176 HDTV 720P

10 1920*1080 28.125 50.00 74.25 HDTV 1080I

11 1920*1080 33.75 60.00 74.25 HDTV 1080I

12 1920*1080 33.72 59.94 74.176 HDTV 1080I

13 1920*1080 56.25 50.00 148.50 HDTV 1080P

14 1920*1080 67.50 60.00 148.50 HDTV 1080P

15 1920*1080 67.432 59.94 148.352 HDTV 1080P

16 1920*1080 27.00 24.00 74.25 HDTV 1080P

17 1920*1080 26.97 23.94 74.176 HDTV 1080P

18 1920*1080 33.75 30.00 74.25 HDTV 1080P

19 1920*1080 33.71 29.97 74.176 HDTV 1080P

5.2. RGB Input(PC)

No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed DDC Remark

1 640*350 31.468 70.09 25.17 EGA X

2 720*400 31.469 70.08 28.32 DOS O

3 640*480 31.469 59.94 25.17 VESA(VGA) O

4 800*600 37.879 60.31 40.00 VESA(SVGA) O

5 1024*768 48.363 60.00 65.00 VESA(XGA) O

6 1152*864 54.348 60.053 80.00 VESA O

7 1360*768 47.712 60.015 85.50 VESA (WXGA) O

8 1280*1024 63.981 60.020 108.0 VESA (SXGA) O FHD

9 1920*1080 66.587 59.934 138.5 HDTV 1080P O FHD

10 1920*1080 67.50 60.00 138.5 HDTV 1080P O FHD

- 7 -

5.3. HDMI Input(PC/DTV)

No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark

PC(DVI) DDC

1 640*350 31.468 70.09 25.17 EGA X

2 720*400 31.469 70.08 28.32 DOS O

3 640*480 31.469 59.94 25.17 VESA(VGA) O

4 800*600 37.879 60.31 40.00 VESA(SVGA) O

5 1024*768 48.363 60.00 65.00 VESA(XGA) O

6 1152*864 54.348 60.053 80.00 VESA O

7 1360*768 47.712 60.015 85.50 VESA (WXGA) O

8 1280*1024 63.981 60.020 108.0 VESA (SXGA) O FHD only

9 1920*1080 67.50 60.00 148.5 HDTV 1080P O FHD only

DTV

1 640*480 31.46 59.94 25.125 SDTV 480P

2 640*480 31.50 60.00 25.125 SDTV 480P

3 720*480 15.73 59.94 13.500 SDTV 480I

4 720*480 15.75 60.00 13.514 SDTV 480I

5 720*576 15.62 50.00 13.500 SDTV 576I(DVB)

6 720*480 31.469 59.94 27.00 SDTV 480P

7 720*480 31.50 60.00 27.027 SDTV 480P

8 720*576 31.250 50.00 27.00 SDTV 576P

9 1280*720 37.50 50.00 74.25 HDTV 720P

10 1280*720 45.00 60.00 74.25 HDTV 720P

11 1280*720 44.96 59.94 74.176 HDTV 720P

12 1920*1080 28.125 50.00 74.25 HDTV 1080I

13 1920*1080 33.75 60.00 74.25 HDTV 1080I

14 1920*1080 33.72 59.94 74.176 HDTV 1080I

15 1920*1080 56.250 50.00 148.50 HDTV 1080P

16 1920*1080 67.50 60.00 148.50 HDTV 1080P

17 1920*1080 67.432 59.94 148.35 HDTV 1080P

18 1920*1080 27.00 24.00 74.25 HDTV 1080P

19 1920*1080 26.973 23.976 74.175 HDTV 1080P

20 1920*1080 33.75 30.00 74.25 HDTV 1080P

21 1920*1080 33.716 29.976 74.175 HDTV 1080P

Don’t insert in

manual

spec. out

- 8 -

SOFTWARE UPDATE

1. Auto Download

(1) Insert the USB memory Stick to the USB port (2) Automatically detect the SW Version and show the below message (3) Click [YES]: initiate the download and install of the update. (4) After finished the update, below Pop-up appear (5) TV will be DC OFF -> ON (6) After TV turned on, Check the updated SW Version and Tool Option

2. Manual Download

(1) Press the SETTINGS / or (Home) button for more than 5 seconds using the user remote control, programme information will

appear at top left on the screen. (2) Enter a four digit password and press OK button. (The TV is set with the initial password “1-1-0-5”.) (3) Select “TV Manager” - “Ez Download”.

- 9 -

BLOCK DIAGRAM

232C

NAND

Flash 2Gb

Module

LVDS

74.25M

X-tal

24MHz

HDMI2(SIDE)

HDMI1(REAR)

MAX3232

TVLink

RGB

Analog

Tuner

DVB-T2/C/S2orDVB-T2/C

M1APR

CI

Digital

CI

AV/COMP

(RCA jack type)

USB(side)

SPIDIF

AMP

Headphone(side)

Sub Amp

FE_TS_Parallel

Speaker

EXT

LAN

Speaker

- 10 -

EXPLODED VIEW (SET)

IMPORTANT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the EXPLODED VIEW. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.

400

521

120

540

900

800

HP1

530

LV1

820

HS1

500

HW1

121

200T

200A

LED Array Ass’y

700

A10

Set + Stand

200P

- 11 -

ARC1

AR1

EXPLODED VIEW (MODULE)

IMPORTANT NOTICE

MRC use only

* MRC : Module Repair Center

200PPR200P

200PPF

Rear Side

POL(Rear) Optical Sheet

Ass’y

200PC 200SL1 200SR1

- 12 -

POL(Front) Panel

DISASSEMBLY GUIDE

1. Unlock screws (“1”: 5 EA, ”2”: 2 EA, “3”: 1 EA) to separate back cover assembly from module.

Detach the Side AV Label(“4”).

(Push the LATCH)

1

2. Detach the Tape(“5, 6”).

3

1

5

4

1

- 13 -

66

5

3. Separate connectors (“7”) from Main/Power PCB and module.

Separate Speaker(“8”: 2 EA) from module.

7

8

7

8

4. Unlock screw (“9”: 10 EA) to separate from module.

7

9

10

- 14 -

10

9

5. Detach the Insulation Sheet.(“11”).

11

b

a

11

(Disassemble ⓑ→ⓐ)

b

6. Unlock screw(“12”: 4 EA) to separate vesa

Detach the supporter(“13”: 4 EA)

12

13

a

b

11

12

13

b

ⓑ

13

12

- 15 -

ⓐ

(Assemble the screw

after insert ⓐ→ⓑ)

12

13

TROUBLE SHOOTING GUIDE

Contents of Standard Repair Process

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

1 2 No video/No audio 2 3 Picture broken/ Freezing 3 4 Color error 4

5

6

7

8

9 Wrecked audio/discontinuation/noise 10 10 11 External device recognition er ror 12

A. Video error

B. Power error

C. Audio error

D. Function error

No video/Normal audio 1

Ver tical /Hori z ontal bar, residual image, light spot, external device color error

No power 6 Off when on, off while viewi ng , pow er auto

on/off No audio/Normal video 9

Remote control & Local switc h checking 11

5

7,8

12 E. Noise Circuit noise, mechanical noi se 13 13 F. Exterior error Exterior defect 14

First of all, Check whether there is SVC Bulletin i n GSCS System for these model.

Standard Repair Process

☞

Error

symptom

A. Video erro r

No video/ Normal audio

Established

date

Revised date

First of all, Check whether all of cables between board is inserted properly or not.

(Main B/D↔ Power B/D, LVDS or EPI Cable, Speaker Cable, IR B/D Cable,,,)

A18

Replace Inverter or module

Normal

voltage

N

Repair Power Board or parts

End

Replace T-con/Main

Y

Board or module

No video Normal audio

Normal

audio

N

Move to No video/No audio

Y

A1

Check Back Light On with naked eye

A18

Check Power Board 13.2V output

On

N

Normal voltage

N

Repair Power Board or parts

Y

Check Power Board

13.2V etc.

1/14

※Precaution

Always check & record S/W Version and White

Balance value before replacing the Main Board

A4 & A2

Replace Main Board

1

Re-enter White Balance value

Standard Repair Process

☞

Error

symptom

No Video/ No audio

A18

Check various voltages of Power Board (13.2V…)

A. Video erro r

No video/ No audio

Normal

voltage?

Replace Power Board and repair parts

Y

N

Check and replace MAIN B/D

Established

date

Revised date

End

2/14

2

☞

Standard Repair Process

A3

Check RF Signal level

Normal Signal?

N

Check RF Cable

Connection

1. Reconnection

2. Install Booster

Normal

Picture?

Y

Close

Y

N

Error

symptom

A. Video erro r

Picture broken/ Freezing

Established

date

Revised date

. By using Digital signal level meter . By using Diagnostics menu on OSD ( Advanced→ Channels→ Channel Tuning→ Manual Tuning → Check the Signal )

- Signal strength (Normal : over 50%)

- Signal Quality (Normal: over 50%)

Check whether other equipm ents have problem or not.

(By connecting RF Cable at other equipment)

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

A4

N

Y

S/W Version

Normal

Picture?

Contact with signal distributor

or broadcaster (Cable or Air)

Check

SVC

Bulletin?

Y

S/W Upgrade

Normal

Picture?

Y

N

Check Tuner

soldering

N

Replace

Main B/D

Y

3/14

Close

3

※

☞

Standard Repair Process

A6

Check color by input

-External Input

-AV

-HDMI

A8

Check Test pattern

Error

symptom

Color

error?

Check error color input mode

Y

N

External Input/

Component

A. Video erro r

Color error

A7

Check and replace Link Cable (EPI or Vx1 Cable) and contact condition

error

Color

error?

Check external device and cable

N

Y

Replace Main B/D

device/Cable

Established

date

Revised date

External

normal

Y

Color

error?

End

Y

Replace module

N

Replace Main/T-con B/D

4/14

HDMI

error

Check external device and cable

4

N

Request repair

for external

device/cable

N

External

device/Cable

normal

Y

Replace Main/T-con B/D

☞

Standard Repair Process

☞

Error

symptom

Vertical / Horizontal bar, residual image,

A. Video erro r

light spot, external device color error

Vertical/Horizontal bar, residual image, light spot

A6

Check color condition by input

-External Input

-HDMI

A8

Check Test pattern

Screen

normal?

N

Replace module

Y

Check external device connection condition

Normal?

N

Request repair for external device

External device screen error-Color error

Check and

Y

replace Link Cable

A7

Established

date

Revised date

Screen

normal?

End

N

Y

Replace Main/T-con B/ D

For LGD panel

Replace Main B/D

For other panel

5/14

Replace Module

N

Screen

normal?

Y

End

Check S/W Version

Check

version

S/W Upgrade

Normal

screen?

End

N

Y

N

Y

Check screen condition by input

-External Input

-Component

-HDMI/DVI

External

Input

error

Component

error

HDMI/

DVI

5

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.

Connect other external device and cable

(Check normal operation of External Input, Com ponent , RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc.

Screen

normal?

Request repair for external device

Screen

normal?

N

Y

N

Replace Main/T-con B/D

Replace Main /T-con B/D

☞

Standard Repair Process

A17

Check LED

. Stand-By: Red or Turn On . Operating: Turn Off

Check Power cord was inserted properly

Error

symptom

Power

LED On?

N

Normal?

Y

Close

N

Y

B. Power error

DC Power on by pressing Power Key On Remote control

Check ST-BY 3.5V

A18

No power

Y

Normal

Y

voltage?

N

Established

date

Revised date

A18

Y

N

Check Power On ‘”High”

Replace Main B/D

Normal

operation?

A18

Measure voltage of each output of Power B/D

N

Y

Replace Main B/D

Normal

voltage?

Replace Power B/D

OK?

Y

6/14

Replace Power B/D

6

☞

Standard Repair Process

Check outlet

Check A/C cord

Check for all 3- phase power out

Error

symptom

Error?

Y

Fix A/ C cord & Outlet and check each 3 phase out

B. Power error

Off when on, off while viewing, power auto on/off

A19

N

Check Power Off Mode

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

※ Caution Check and fix exterior of Power B/D Part

CPU

Abnormal

1

A18

Established

date

Revised date

Replace Main B/D

Normal

voltage?

Replace Power B/D

Y

N

Replace Power B/D

Replace Main B/D

Normal?

N

7/14

Y

End

7

Standard Repair Process

Error

symptom

Off when on, off while viewing, power auto on/off

B. Power error

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

Power Off list Explanation Action contents

KEYTIMEOUT

1SEC Power OFF

ACDET

5V MNT

CPUABNORMAL If the CPU attempts to reset in case of abnormal operation and Shut Down in case of failure.

NO POLING

CPUCMD

INV_ERROR

ONRF_FAIL RESULT : Reboot, CONDITION : OLED module compensation is running but fails. Check & Change OLED Module

PNWASHFAIL Power off by panel noise wash function fail case. Check & Change OLED Module

RESET When Micom is reset by AC Off

KEY Power off by Local key

OFFTIMER Power off by Off timer

SLEEPTIMER Power off by sleep timer

NOSIG Power off by No Signal

FANSTOP Power off by FAN operation stopped

INSTOP Power off by Instop Key

AUTO OFF Power off by auto off function

RESREC Power off by reserved recording

RECEND Power off when recording stops

SWDOWN Reboot by SW down load function UNKNOWN COMP_END

PNWASHDONE Power off by panel noise wash function complited. (OLED)

Power off when TV is not turned off during a certain time RESULT : micom force to trigger TV power off. CONDITION : When pressing power key while power on/off status, CPU does not response within 8 seconds

Almost the same as Power Off by KEYTIMEOUT. If there is no vaild communication Bet ween CPU and MICOM for more than 5 seconds, the MICOM switcheds off PSU and Records. Power off by 1SEC Power off. In this case, we don’t have information where the malfunction exactly occurred. But in in indicates that CPU had stopped and rebooted. In case of AC Off (It is normal when the power cord is unplugged.) Normal

If there are many ACDETs connected, Power Board is defective

Power off by unstable AC power detect. RESULT : micom check the stable power. CONDITION : When AC on or DC on, stabilization check routine (Power Detect High Check) fail after multi power on.

Power off when receiving no ack. RESULT : TV power off/on (Reboot) CONDITION : There is no I2C response from CPU for 15 seconds.

Power off by main SoC command. Check & Change Main B/D Power off by module error (OLED)

CONDITION : OLED Module send signal to micom

No meaning (same as initial value)

OLED threshold voltage degradation(Compensation) completes.

Established

date

Revised date

8/14

Check & Change Main B/D

Check & Change Power B/D

Check & Change Main B/D

Check & Change OLED Module

Normal Case

8