LG 43LH54 Schematic

Internal Use Only

LED TV

SERVICE MANUAL

CHASSIS : LD67T

MODEL : 43/49LH54** 43/49LH54**-ZA/ZD

CAUTION

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

P/NO : MFL69473201 (1603-REV01)

CONTENTS

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

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

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

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

ADJUSTMENT INSTRUCTION ............................................................. 10

BLOCK DIAGRAM ................................................................................. 16

EXPLODED VIEW .................................................................................. 17

ASSEMBLY / DISASSEMBLY ............................................................... 18

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

Only for training and service purposes

- 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 Schematic Diagram and 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

Only for training and service purposes

- 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.

Only for training and service purposes

- 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.

Only for training and service purposes

- 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 LD67T chassis.

2. Requirement for Test

Each part is tested as below without special notice.

1) Temperature : 25±5°C (77±9°C), CST : 40±5°C

2) Relative Humidity : 65±10%

3) Power Voltage : Standard input voltage (AC100~240V@ 50/60Hz) Standard Voltage of each product 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

3. Test method

1) Performance: LGE TV test method followed

2) Demanded other specification

- Safety : CE, IEC specification

- EMC : CE, IEC specification

4. Model General Specification

No. Item Specication Remarks

DTV & Analog (Total 40 countries)

DTV (MPEG2/4, DVB-T) :39 countries

Albania/Algeria/Austria/Belarus/Belgium/Bosnia/Bulgaria/Croatia/Czech/ Denmark/Estonia/Finland/France/Germany/Greece/Hungary/Ireland/Italy/ Kazakhstan/Latvia/Lithania/Luxemburg/Macedonia/Morocco/Netherlands/ Norway/Poland/Portugal/ Rumania/ Russia/ Serbia/ Slovakia/ Slovenia/ Spain/Sweden/ Switzerland/ Turkey/ UK/ Ukraine

1 Market

(PAL Market-40 Countries)

EU/CIS

DTV (MPEG2/4, DVB-T2): 9 countries

UK/Denmark/Sweden/Finland/Norway/Ireland/Ukraine/Kazakhstan/ Mongolia

DTV (MPEG2/4, DVB-C): 39 countries

Albania/Algeria/Austria/Belarus/Belgium/Bosnia/Bulgaria/Croatia/Czech/ Denmark/Estonia/Finland/France/Germany/Greece/Hungary/Ireland/Italy/ Kazakhstan/Latvia/ Lithania/Luxemburg/Macedonia/Morocco/Netherlands/ Norway/Poland/Portugal/ Rumania/ Russia/ Serbia/ Slovakia/ Slovenia/ Spain/Sweden/ Switzerland/ Turkey/ UK/ Ukraine

DTV (MPEG2/4,DVB-S): 29 countries

Italy/Germany/France/Spain/Netherlands/Belgium/Luxemburg/Greece/ Czech/ Austria /Hungary/Swiss/Croatia/Turkey/Slovenia/Poland/Portugal/ Morocco/Latvia/Estonia/Lithuania/Rumania/Bulgaria/Russia/Slovakia/Bosnia/Serbia/Albania/ Belarus

Supported satellite : 22 satellites

HISPASAT 1C/1D, ATLANTIC BIRD 2, NILESAT 101/102, ATLANTIC BIRD 3, AMOS 2/3, THOR 5/6, IRIUS 4, EUTELSAT-W3A, EUROBIRD 9A, EUTELSAT-W2A, HOTBIRD 6/8/9, EUTELSAT-SESAT, ASTRA 1L/H/M/KR, ASTRA 3A/3B, BADR 4/6, ASTRA 2D, EUROBIRD 3, EUTELSAT-W7, HELLASSAT 2, EXPRESS AM1, TURKSAT 2A/3A, INTERSAT10

Only for training and service purposes

- 6 -

No. Item Specication Remarks

46 ~ 862 Mhz (Maximum number of storable programmes : 2000)

950 ~ 2150 Mhz (Maximum number of storable programmes : 6000)

VHF III: 174 ~ 230 Mhz UHF IV: 470 ~ 606 Mhz UHF V: 606 ~ 862 Mhz

S Band II : 230 ~ 300 Mhz S Band III : 300 ~ 470 Mhz (Maximum number of storable programmes : 2000)

46 ~ 862 Mhz (Maximum number of storable programmes : 2000)

* : only DVB-T2/C/S2 support models

External antenna impedance : 75 Ω

► 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

Broadcasting system

2

(Programme coverage,Band)

3 Receiving system

(1) Analogue TV

- Terrestrial/Cable

1) PAL/SCEAM B/G, D/K, I SECAM L

(2) Digital TV

- Satellite DTV

1) DVB-S/S2*

- Terrestrial

1) DVB-T/T2*

- Cable

1) DVB-C

Analog : Upper Heterodyne Digital : COFDM, QAM

► DVB-C

- Symbolrate : 4.0 Msymbols/s to 7.2 Msymbols/s

- Modulation : 16QAM, 64-QAM, 128-QAM and 256-QAM

► DVB-S

- symbol rate DVB-S2 (8PSK / QPSK) : 2 ~ 45 Msymbol/s DVB-S (QPSK) : 2 ~ 45 Msymbol/s

- viterbi DVB-S mode : 1/2, 2/3, 3/4, 5/6, 7/8 DVB-S2 mode : 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10

4 Scart Jack (1EA) PAL, SECAM

Component & AV

5

Common port (1EA)

6 HDMI Input (2EA) HDMI1/2-DTV Support HDCP (LH51/LH52 Series : HDMI Input (1EA)

7 Audio Input (1EA) Component & AV Component & AV’s audio input is used by common port

8 USB (1EA) EMF, Xvid HD, For SVC (download) JPEG, MP3, DivX HD

9 DVB

10 Ethernet (1EA) Wired, DMP only Only UK T2 Model (LH54/LH51/LH52/LH53) : for MHEG

Video Input RCA (PAL, SECAM, NTSC) 4 System : PAL, SECAM, NTSC, PAL60

Component Input (Y/Cb/Cr, Y/Pb/Pr)

DVB-T

DVB-C

DVB-S CI + : Germany (Astra HD+)

Scart 1 Jack is Full Scart and support RF-OUT (analog), EU only

CI : UK, Finland, Denmark, Norway, Sweden, Russia, Spain, Ireland, Luxemburg, Belgium, Netherland CI+ : France(Canal+), Italy(DGTVi)

CI : Switzerland, Austria, Slovenia, Hungary, Bulgaria CI+ : Switzerland(UPC,Cablecom), Netherland(Ziggo), Germany(KDG,CWB), Finland(labwise)

Only for training and service purposes

- 7 -

5. External Input Support format

5.1. Video resolutions (2D)

(1) Component Video Input (Y, CB/PB, CR/PR)

No.

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

Resolution H-freq(kHz) V-freq.(kHz) Pixel clock Proposed

Specication

Only for training and service purposes

- 8 -

(2) HDMI Input (PC/DTV)

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

PC (DVI) DDC

1 640*350 31.46 70.09 25.17 EGA X

2 720*400 31.46 70.08 28.32 DOS O

3 640*480 31.46 59.94 25.17 VESA(VGA) O

4 800*600 37.87 60.31 40.00 VESA(SVGA) O

5 1024*768 48.36 60.00 65.00 VESA(XGA) O

6 1152*864 54.34 60.05 80.00 VESA O

7 1360*768 47.71 60.01 85.50 VESA (WXGA) O

8 1280*1024 63.98 60.02 108.0 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 31.47 59.94 27.00 SDTV 480P

7 720*480 31.50 60.00 27.027 SDTV 480P

8 720*576 31.25 50.00 27.00 SDTV 576P(DVB)

9 1280*720 37.50 50.00 74.25 HDTV 720P(DVB)

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 28.12 50.00 74.25 HDTV 1080I(DVB)

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 56.25 50.00 148.50 HDTV 1080P(DVB)

16 1920*1080 67.50 60.00 148.50 HDTV 1080P

17 1920*1080 67.43 59.94 148.35 HDTV 1080P

18 1920*1080 27.00 24.00 74.25 HDTV 1080P

19 1920*1080 26.97 23.97 74.175 HDTV 1080P

20 1920*1080 33.75 30.00 74.25 HDTV 1080P

21 1920*1080 33.71 29.97 74.175 HDTV 1080P

Don’t insert in manual

spec. out

(3) DTV Input

No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed 3D input proposed mode

1 1280*720 37.50 50 74.25 HDTV 720P Side by Side, Top & Bottom

2 1920*1080 28.125 50 74.25 HDTV 1080I Side by Side, Top & Bottom

(4) USB Input

No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed 3D input proposed mode

1 1920*1080 33.75 30 74.25 HDTV 1080P Side by Side, Top & Bottom, JPS, MPO(Photo)

Only for training and service purposes

- 9 -

ADJUSTMENT INSTRUCTION

1. Application Range

This specification sheet is applied to all of the LED TV with LD67T chassis.

2. Designation

(1) The adjustment is according to the order which is

designated and which must be followed, according to the

plan which can be changed only on agreeing. (2) Power adjustment : Free Voltage. (3) Magnetic Field Condition: Nil. (4) Input signal Unit : Product Specification Standard. (5) Reserve after operation: Above 5 Minutes (Heat Run) Temperature : at 25°C ± 5°C Relative humidity : 65 ±10% Input voltage : 220V, 60Hz (6) Adjustment equipments : Color Analyzer (CA-210 or CA-110),

DDC Adjustment Jig equipment, SVC remote control.

(7) Push the “IN STOP KEY” – For memory initialization.

- Case1 : Software version up

1) After downloading S/W by USB, TV set will reboot automatically

2) Push “In-stop” key

3) Push “Power on” key

4) Function inspection

5) After function inspection, Push “In-stop” key.

- Case2 : Function check at the assembly line

1) When TV set is entering on the assembly line, Push “In-stop” key at first.

2) Push “Power on” key for turning it on.

If you push “Power on” key, TV set will recover channel

information by itself.

3) After function inspection, Push “In-stop” key.

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(5) Click “Auto” tab and set as below. (6) Click “Run”. (7) After downloading, check “OK” message.

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* USB DOWNLOAD (*.epk file download)

(1) Put the USB Stick to the USB socket. (2) Automatically detecting update file in USB Stick.

- If your downloaded program version in USB Stick is Low, it didn’t work.

But your downloaded version is High, USB data is automatically detecting.

(3) Show the message “UPDATING”

3. Main PCB check process

* APC - After Manual-Insert, executing APC

3.1. Boot file Download

(1) Execute ISP program “Mstar ISP Utility” and then click

“Config” tab.

(2) Set as below, and then click “Auto Detect” and check “OK”

message.

If “Error” is displayed, Check connection between

computer, jig, and set.

(3) Click “Read” tab, and then load download file (XXXX.bin)

by clicking “Read”.





(4) Click “Connect” tab. If “Can’t ” is displayed, Check

connection between computer, jig and set.

Only for training and service purposes

- 10 -

(4) Updating is starting.

(5) Updating Completed, The TV will restart automatically in 5

seconds.

(6) If your TV is turned on, check your updated version and

Tool option. (Explain the next stage)

* If downloading version is more high than your TV have,

TV can lost all channel data. In this case, you have to channel recover. If all channel data is cleared, you didn’t have a DTV/ATV test on production line.

* After downloading, have to adjust TOOL OPTION again.

(1) Push "IN-START" key in service remote control. (2) Select "Adjust Check" and Push “OK” button. (3) Push in the number. (Each of models has their number) (4) Completed selecting Tool option.

3.2. ADC Process (Optional) : If ADC processes as OTP, There is no

need to proceed internal ADC.

(1) Enter Service Mode by pushing “ADJ” key.

(2) Enter Internal ADC mode by pushing “►” key at “10. ADC

Calibration”

Caution: Using ‘P-ONLY’ button of the Adjustment R/C,

power on TV.

ADC Calibration Protocol (RS232)

NO Item CMD 1CMD 2Data 0

Enter

Adjust

MODE

ADC

adjust

Adjust ‘Mode

In’

ADC

Adjust

A A 0 0 When transfer

the ‘Mode In’, Carry the command.

A D 1 0 Automatically

adjustment (The use of a internal pattern)

- Adjust Sequence

▪ aa 00 00 [Enter Adjust Mode] ▪ xb 00 40 [Component Input ] ▪ ad 00 10 [Adjust 480i & 1080p Comp] ▪ aa 00 90 End Adjust mode

Required equipment : Adjustment R/C.

3.3. EDID Download

(1) After enter Service Mode by pushing “ADJ” key. (2) Enter EDID D/L mode. (3) Enter “START” by pushing “OK” key.

3.4. EDID data

(1) 2D HD Model HDMI EDID data

0 1 2 3 4 5 6 7 8 9 A B C D E F

00 00 FF FF FF FF FF FF 00 1E 6D

ⓒ

10 20 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 01 01 30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70 40 36 00 40 84 63 00 00 1E 64 19 00 40 41 00 26 30 50 18 88 36 00 40 84 63 00 00 18 00 00 00 FD 00 3A 60 3E 1E 53 10 00 0A 20 20 20 20 20 20 70 80 02 03 22 F1 4E 10 1F 04 93 05 14 03 02 12 20 21 90 22 15 01 26 15 07 50 09 57 07 A0 B0 00 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 C0 20 C2 31 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E D0 96 00 A0 5A 00 00 00 18 02 3A 80 18 71 38 2D 40 E0 58 2C 45 00 A0 5A 00 00 00 1E 00 00 00 00 00 00 F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26

ⓓ

ⓕ

01 1D 80 18 71 1C 16 20 58 2C 25 00 A0 5A

(2) 2D FHD Model HDMI EDID data

0 1 2 3 4 5 6 7 8 9 A B C D E F

00 00 FF FF FF FF FF FF 00 1E 6D

ⓒ

10 20 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80 30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C 40 45 00 A0 5A 00 00 00 1E 66 21 50 B0 51 00 1B 30 50 40 70 36 00 A0 5A 00 00 00 1E 00 00 00 FD 00 3A 60 3E 1E 53 10 00 0A 20 20 20 20 20 20 70 80 02 03 22 F1 4E 10 9F 04 13 05 14 03 02 12 20 21 90 22 15 01 26 15 07 50 09 57 07 A0 B0 31 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 C0 20 C2 31 00 00 1E 02 3A 80 18 71 38 2D 40 58 2C D0 45 00 A0 5A 00 00 00 1E 01 1D 00 BC 52 D0 1E 20 E0 B8 28 55 40 C4 8E 21 00 00 1E 00 00 00 00 00 00 F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26

ⓓ

ⓕ

01 1D 80 18 71 1C 16 20 58 2C 25 00 20 C2

Detail EDID Options are below

ⓐ Product ID

MODEL NAME HEX EDID Table DDC Function

HD/FHD Model 0001 01 00 Analog/Digital

ⓑ Serial No: Controlled on production line.

Monthly : ‘01’ → ‘01’, Year : ‘2016’ → ‘1A’ fix

ⓓ Model Name(Hex): Refer to the ASCII Code Table.

Cf) TV set’s model name in EDID data is below.

MODEL NAME MODEL NAME(HEX)

LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20

20 20 20 20 20 20 (LG TV)

ⓐ ⓑ

ⓓ

01

ⓕ

ⓐ ⓑ

ⓓ

01

ⓕ

ⓔ

Caution : Never connect HDMI cable when EDID

downloaded.

Only for training and service purposes

- 11 -

* ASCII Code

ⓔ Checksum: Changeable by total EDID data.(2D)

EDID C/S data HD FHD

HDMI HDMI

check sum

(Hex)

ⓕ Vendor Specific

1) HD/FHD Model(2D)

INPUT MODEL NAME(HEX)

HDMI1 67 03 0C 00 10 00 80 1E

HDMI2 67 03 0C 00 20 00 80 1E

Block 0 73 3F

Block 1 5B (HDMI1) 25 (HDMI1)

4B (HDMI2) 15 (HDMI2)

3.5. Function Check

(1) Check display and sound

■ Check Input and Signal items. (cf. work instructions)

1) TV

2) AV (SCART / CVBS)

3) COMPONENT (480i)

4) HDMI * Display and Sound check is executed by Remote

control.

Caution : Not to push the INSTOP KEY after completion if

the function inspection.

- Cool temp Spec is 13000K

cool med warm

x y x y x y

spec 271 270 286 289 313 329

target 278 280 293 299 320 339

- W/B information

Model information W/B information

Chassis or

Model

LD67T/B/C All All Direct LED O

Connecting picture of the measuring instrument (On Automatic control) : Inside PATTERN is used when W/B is controlled. Connect to

auto controller or push Adjustment R/C P-ONLY Enter the mode of White-Balance, the pattern will come out.

Module Panel Backlight

Type

Using W/B table

4. Total Assembly line process

4.1. White Balance adjustment

■ W/B Equipment condition

CA210 : LED CH 14, Test signal : Inner pattern (80IRE)

■ Above 5 minutes H/run in the inner pattern. (“power on” key

of adjust remote control)

■ If it is executed W/B adjustment in 2~3 minutes H/run, it is

adjusted by Target data

Color

Temper-

ature

Mode Temp Coordinate

spec

Cool 13,000k X=0.271

(±0.002) Y=0.270 (±0.002)

Me-

9,300k X=0.286

dium

Warm 6,500k X=0.313

(±0.002) Y=0.289 (±0.002)

(±0.002) Y=0.329 (±0.002)

Target Chassis

or Model

X=0.278 Y=0.280

X=0.293 Y=0.299

X=0.320 Y=0.339

ALL

Model

(LD67T/

LD67B/

LD67C)

4.1.1. Auto-control interface and directions

(1) Adjust in the place where the influx of light like floodlight

around is blocked. (Illumination is less than 10ux).

(2) Adhere closely the Color Analyzer ( CA210 ) to the module

less than 10cm distance, keep it with the surface of the Module and Color Analyzer’s Prove vertically.(90° +/- 2.5°).

(3) Aging time

-. After aging start, keep the power on (no suspension of

power supply) and heat-run over 5 minutes.

-. Using ‘no signal’ or ‘POWER ONLY’ or the others, check the

back light on.

▪ Auto adjustment Map (using RS-232C to USB cable)

RS-232C COMMAND

[ CMD ID DATA ]

Wb 00 00 White Balance Start Wb 00 ff White Balance End

RS-232C

COMMAND

[CMD ID DATA] MIN

Cool Mid Warm Cool Mid Warm

R Gain jg Ja jd 00 172 192 192 254

G Gain jh Jb je 00 172 192 192 192

B Gain ji Jc jf 00 192 192 172 254

R Cut 64 64 64 128

G Cut 64 64 64 128

B Cut 64 64 64 128

CENTER

(DEFAULT)

MAX

Only for training and service purposes

- 12 -

Caution Color Temperature : Cool, Medium, Warm. One of R Gain/G Gain/ B Gain should be kept on 0xC0, and adjust other two lower than C0. (when R/G/B Gain are all C0, it is the FULL Dynamic Range of Module)

4.1.2. Manual W/B process using adjusts Remote control.

- After enter Service Mode by pushing “ADJ” key,

- Enter White Balance by pushing “►” key at “11. White

Balance”.

If it is not same, then correct it same with BOM and unplug AC cable. For correct it to the model’s module from factory JIG model.

Push The “IN STOP KEY” after completing the function

inspection. And Mechanical Power Switch must be set “ON”.

4.2. IR emitter inspection.

(1) Start 3D pattern inspection. (2) If IR emitter signal is correctly received to IR receiver, the

lamp of IR tester turns on.

4.1.2.1. CASE Cool Mode

First adjust the coordinate far away from the target value (x, y).B (1) x, y >target (2) x, y< target (3) x >target , y< target (4) x< target , y >target

- Every 4 case have to fit y value by adjusting B Gain and then fit x value by adjusting R-Gain

- In this case, increasing/decreasing of B Gain and R Gain can be adjusted.

- How to adjust

(1) if G gain more than 172 Adjust R Gain and B Gain less than 192 (2) if the G gain value be adjusted down to 172 One of the R/B Gain is 254 (3) if G Gain is 172 , More than one of R/B Gain is to be

between 192~254

4.1.2.2. CASE Medium / Warm

First adjust the coordinate far away from the target value(x, y). (1) x, y >target

) Decrease the R, G.

(2) x, y< target

) First decrease the B gain,

) Decrease the one of the others.

(3) x >target , y< target

) First decrease B, so make y a little more than the target.

) Adjust x value by decreasing the R

(4) x < target , y >target

) First decrease B, so make x a little more than the target.

) Adjust x value by decreasing the G

4.3. Outgoing condition Configuration

When pressing IN-STOP key by SVC remote control, Red LED are blinked alternatively. And then automatically turn off. (Must not AC power OFF during blinking)

5. GND and HI-POT Test

5.1. HI-POT auto-check preparation

Check the POWER CABLE and SIGNAL CABLE insertion condition

5.2. HI-POT auto-check

(1) Pallet moves in the station. (POWER CORD / AV CORD is tightly inserted) (2) Connect the AV JACK Tester. (3) Controller (GWS103-4) on. (4) HI-POT test (Auto)

- If Test is failed, Buzzer operates.

- If Test is passed, GOOD Lamp on and move to next process automatically.

5.3. Checkpoint

(1) Test voltage

- Touchable Metal : 3KV / min at 100mA

- SIGNAL : 3KV / min at 100mA (2) TEST time: 1 second. (case : mass production ) (3) TEST POINT

- Touchable Metal => LIVE & NEUTRAL : Touchable Metal.

- SIGNAL => LIVE & NEUTRAL : SIGNAL.

After You finish all adjustments, Press “In-start” button and

compare Tool option and Area option value with its BOM, if it is correctly same then unplug the AC cable.

Only for training and service purposes

- 13 -

6. Model Name & Serial Number Download

6.1. Model name & Serial number

(1) Press “Power on” key of service remote control.(Baud rate

: 115200 bps) (2) Connect USB to RS232 Signal Cable to USB Jack. (3) Write Serial number. (4) Must check the serial number at the Diagnostics of SET

UP menu. (Refer to below).

6.2. Signal TABLE

CMD LENGTH ADH ADL DATA_1 . . . Data_n CS DELAY

CMD : A0h LENGTH : 85~94h (1~16 bytes) ADH : EEPROM Sub Address high (00~1F) ADL : EEPROM Sub Address low (00~FF) Data : Write data CS : CMD + LENGTH + ADH + ADL + Data_1 + … + Data_n Delay : 20ms

a. Press the ‘In start’ key of ADJ remote control. b. Go to the menu ‘6.Model Number D/L’ like below photo. c. Input the Factory model name(ex 32LV3400-ZG) or Serial

number like photo.

d. Check the model name Instart menu → Factory name

displayed (ex 49LH540V-ZA)

e. Check the Diagnostics (DTV country only) → Buyer model

displayed (ex 49LH540V-ZA)

6.3. Command Set

No. Adjust mode CMD(hex) LENGTH(hex) Description

1 EEPROM WRITE A0h 84h+n n-bytes Write

* Description FOS Default write : <7mode data> write Vtotal, V_Frequency, Sync_Polarity, Htotal, Hstart, Vstart, 0, Phase Data write : Model Name and Serial Number write in EEPROM.

(n = 1~16)

6.4. Method & notice

(1) Serial number D/L is using of scan equipment. (2) Setting of scan equipment operated by Manufacturing

Technology Group. (3) Serial number D/L must be conformed when it is produced

in production line, because serial number D/L is mandatory

by D-book 4.0

Manual Download (Model Name and Serial Number)

If the TV set is downloaded By OTA or Service man, Sometimes model name or serial number is initialized.( Not always)

There is impossible to download by bar code scan, so It

need Manual download.

7. MAC Address & CI+ Key Download

7.1. MAC Address

7.1.1. Equipment & Condition

▪ Play file : Serial.exe ▪ MAC Address edit ▪ Input Start / End MAC address

7.1.2. Download method

7.1.2.1. Communication Prot connection

Connection : PCBA (USB Port) USB to Serial Adapter (UC-232A) RS-232C cable PC(RS-232C port)

Caution: LJ21* chassis support only UC-232A driver.

(only use this one.)

Only for training and service purposes

- 14 -

7.1.2.2. MAC Address & CI+ Key Download

▪ Set CI+ Key path Directory at Start Mac & CI+ Download

Programme

▪ Com 1,2,3,4 and 115200 (Baudrate)

7.3. LAN PORT INSPECTION(PING TEST)

GP4_LOW

▪ Port connection button click(1) ▪ Push the (2) MAC Address write. ▪ At success Download, check the OK (3) ▪ Start CI+ Key Download, Push the (4) ▪ Check the OK or NG



7.2. LAN Inspection

7.2.1. Equipment & Condition

▪ Each other connection to LAN Port of IP Hub and Jig

7.3.1. Equipment setting

(1) Play the LAN Port Test PROGRAM. (2) Input IP set up for an inspection to Test Program. *IP Number : 12.12.2.2

7.3.2. LAN PORT inspection (PING TEST)

(1) Play the LAN Port Test Program. (2) Connect each other LAN Port Jack. (3) Play Test (F9) button and confirm OK Message. (4) Remove LAN CABLE.

7.2.2. LAN inspection solution

▪ LAN Port connection with PCB ▪ Network setting at MENU Mode of TV ▪ Setting automatic IP ▪ Setting state confirmation

- If automatic setting is finished, you confirm IP and MAC

Address.

Only for training and service purposes

- 15 -

BLOCK DIAGRAM

1. EU/CIS : T2/C/S2 : Model LH54/LH53 : LD67T

Only for training and service purposes

- 16 -

EXPLODED VIEW

IMPORTANT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and 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.

901

411

500

902

400

800

401

LV1

521

540

A10 700

A2

Set + Stand

120

200

Only for training and service purposes

- 17 -

530

820

■ 43LH54

oint press the latch assembly

(1) Assemble guide

ASSEMBLY / DISASSEMBLY

1.

Assemble rear cover

2 2

2

3

2

Rear Cover

2

2.

Insert the Screw ᐮ,ᐯ

3.

Assemble Joy Stick Cover

4.

Insert the Screw ᐱ

※ P

② 3*5.5, SCREW TORQUE : 4 ~ 7Kgf.cm ③,⑤ 4*10, SCREW TORQUE : 5 ~ 7Kgf.cm

2

5 5

-R\6WLFN&RYHU

4

Assembly JOYSTICK and 10P HARNESS

Fix JOYSTICK

Only for training and service purposes

- 18 -

(2) Disassemble guide

5 5

Remove JOYSTICK Cover

-R\6WLFN&RYHU

2 2

2

3

2

4

Disassembly JOYSTICK and 10P HARNESS

1.

2

2.

3.

4.

Remove the Screw ᐱ

Disassemble Joy Stick Cover

Remove the Screw

Disassemble rear cover

ᐮ,ᐯ

Rear Cover

Only for training and service purposes

- 19 -

■ 49LH54

c d

d c

(1) Assemble guide

1

b

1

a

1

1. Assemble/Fix the REAR COVER + MODULE

1

(When fix the latch, push the Left/Right sides (a→b→c→d)

at the same time).

b

2. Insert the Screw ᐭ,ᐮ

3. Assemble Joy Stick Cover

4. Insert the Screw

ᐭ 3*5.5, SCREW TORQUE : 4 ~ 7Kgf.cm ᐮ 4*10, SCREW TORQUE : 5 ~ 7Kgf.cm

a

ᐮ

2

1

Remove 10P HARNESS

2

1

Assembly JOYSTICK and 10P HARNESS

1

Fix JOYSTICK

Only for training and service purposes

- 20 -

(2) Disassemble guide

2 2

Remove JOYSTICK Cover

-R\6WLFN&RYHU

Disassembly JOYSTICK and 10P HARNESS

c d

1

b

1

a

d c

1

1. Remove the Screw ᐮ

1

2. Disassemble Joy Stick Cover

3. Remove the Screw

b

4. Disassemble rear cover

a

ᐭ,ᐮ

2

1

2

1

Only for training and service purposes

- 21 -

TROUBLE SHOOTING GUIDE

LGE Internal Use Only

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

1

A. Video error

No video/Normal audio 1

2 No video/No audio 2

3 Tuning fail, Picture broken/ Freezing 3, 4

4 Color error 5

5

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

6

B. Power error

No power 7

7 Off when on, off while viewing, power auto on/off 8 8

C. Audio error

No audio/Normal video 9

9 Wrecked audio/discontinuation/noise 10

10

D. Function error

Remote control & Local switch checking 11 11 External device recognition error 12 12 E. Noise Circuit noise, mechanical noise 13 13 F. Exterior error Exterior defect 14

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

Contents of Standard Repair Process

LGE Internal Use Only

Y

N

Move to

No video/No audio

No video

Normal audio

Check Back Light

On with naked eye

Check LVDS 12 V

of Main B/D

Replace T-con B/D

or Module

Replace Main

B/D or Repair parts

Check Main B/D to LED Back light Voltage

Replace Module

Replace Main

B/D or Repair parts

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

Replace Main Board Re-enter White Balance value

※Precaution

☞A4 ☞A1

☞A2

☞A3 & A6

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

(Main B/D ↔ Adaptor, LVDS Cable, Speaker Cable, IR B/D Cable…)

Normal

Audio

On

Y

N

Normal

Voltage

Normal

Voltage

Y

N

Y

N

Error Symptom

A. Video Error

Established date

1/14

Content

No video / Normal audio

Revised date

Standard Repair Process

LGE Internal Use Only

Check voltage 19V

of Adaptor

No video /

No audio

Replace Main

B/D or Repair parts

Replace Adaptor

Normal Voltage

Y

N

Error Symptom

A. Video Error

Established date

2/14

Content

No video / No audio

Revised date

Standard Repair Process

☞A13

LGE Internal Use Only

Y

N

☞ A5

N

Check RF Signal level

Check RF Cable

Connection

1. Reconnection

2. Install Booster

Check

S/W Version

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`

Replace

Main B/D

Check

Tuner soldering

Y

N

Y

. By using Digital signal level meter

. By using Diagnostics Setting on OSD ( Setting → Customer Support(red button on remote control) → Signal Test )

- Signal strength (Normal : over 50%)

- Signal quality (Normal : over 50%)

Y

Contact with signal distributor

or broadcaster (Cable or Air)

N

Y

N

☞ A6

End

Normal

Signal

Normal

Picture

Normal Picture

Normal

Picture

SVC

Bulletin

End

Normal

Picture

Error Symptom

A. Video Error

Established date

3/14

Content

Tuning fail, Picture broken/freezing

Revised date

Standard Repair Process

LGE Internal Use Only

Y

N

☞ A5

Check RF Signal level

Check

S/W Version

S/W Upgrade

Y

N

Y

Check RF signal cable (DVB satellite signal or not) Check whether other equipments have problem or not. (By connecting RF Cable at other equipment) → Set-Top-Box, Different maker TV etc

Y

Replace satellite setting

(match with installed ANT)

N

Y

N

☞ A6

Check satellite setting.

- Check LNB frequency

- Check satellite

- Check Satellite connection (DiSEqC, motor, etc…)

Contact with signal

distributor

or broadcaster

(Cable or Air)

N

Check

Tuner soldering

Replace

Main B/D

Normal

Picture

Normal

Picture

Normal

Setting

SVC

Bulletin

Normal

Signal

End

Error Symptom

A. Video Error

Established date

4/14

Content

Tuning fail, Picture broken/freezing

Revised date

Standard Repair Process

LGE Internal Use Only

Color

error

Y

N

Check and replace Link

Cable

(LVDS) and contact condition

Y

N

Replace Main B/D

Check error

color input

mode

Check color by input

- External Input (COMPONENT/AV/HDMI)

Y

Check external

device and

cable

Replace Main B/D

N

☞A7

N

Y

Replace module

Request repair

for external

device/cable

Check Test pattern

☞A10

☞ A8 / A9

End

Color

error

Color

error

External

device/

Cable

Normal

External

Input

Component,

HDMI

error

Error Symptom

A. Video Error

Established date

5/14

Content

Color error

Revised date

Standard Repair Process

LGE Internal Use Only

N

Y

Check external

device

connection

condition

Y

N

Check and

replace Link

Cable

Y

Replace

Module

Check color condition by input

- External Input (Component/AV/HDMI)

Vertical/Horizontal bar, residual image, light spot

Request repair

for external

device

☞A10

External device screen error-Color error

Connect other external

device and cable

(Check normal operation of

External Input, Component

and HDMI by connecting

Jig, pattern Generator,

Set-top Box etc.

N

Y

Replace

Main B/D

Check screen condition by input

-External Input (Component/AV/ HDMI)

Request repair for

external device

Check S/W Version

Y

N

S/W Upgrade

Y

N

Y

N

Replace Main B/D

Replace

Module

☞A7

☞ A8/ A9

Check Test pattern

N

End

Screen

normal

Screen normal

Screen

normal

Screen normal

Screen

normal

End

Check

Version

Normal Screen

External

Input error

Error Symptom

A. Video Error

Established date

6/14

Content

Vertical/Horizontal bar, Residual Image,

Light spot, External device Color error

Revised date

Standard Repair Process

Y

N

End

LGE Internal Use Only

Power

LED On

Y

N

DC Power on

by pressing Power Key

On Remote control

Y

N

Check Adaptor/

Power cord

was inserted properly

Check

Power LED

Replace

Main B/D

N

Y

Check ST-BY 3.5V

N

Replace Adaptor or

Replace Main B/D

Y

☞A11

☞A16

Stand-By : Red

※

Power

LED On

Normal

Voltage

Normal

Operati

on

Error Symptom

B. Power Error

Established date

7/14

Content

No power

Revised date

Standard Repair Process

End

LGE Internal Use Only

Normal

Voltage

N

Y

Check Power Off

Mode

Fix A/C cord & Outlet

Replace Main B/D

(If Power Off mode is not displayed) Check Adaptor voltage

Y

N

Replace Main B/D

Replace Adaptor

N

Y

☞A14

☞A13

Status Power off List Explanation

Normal

"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 "POWEROFF_UNKNOWN" Power off by unknown status except listed case

Abnormal

"POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal

* Please refer to the all cases which

can be displayed on power off mode.

Adaptor

DC Out

CPU

Abnorm

al

Abnorm

al1

Normal End

Error Symptom

B. Power Error

Established date

8/14

Content

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

Revised date

Standard Repair Process

Replace

Adaptor

Y

Error

N

Check outlet

or A/C cord

LGE Internal Use Only

No audio

Screen normal

Check user

Connection

from Main 

Speaker Cable

N

Y

Insert wafer SPK Cable

Replace Speaker

or Main B/D

Connec

tion

Error Symptom

C. Audio Error

Established date

9/14

Content

No audio / Normal video

Revised date

Standard Repair Process

☞A15

Normal

Audio

End

Y

N

LGE Internal Use Only

Check and replace

speaker and

connector

Connect and check

other external

device

Y

Check and fix external device

Replace Adaptor

N

Y

Check input signal

-RF

-External Input

(When RF signal is not received) Request repair to external

cable/ANT provider

Y

Check Voltage 19V

of Adaptor

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

Replace Main B/D

N

☞A13

End

Signal

Normal

Normal Voltage

Normal

Audio

Wrecked Audio/

Discontinuation/

Noise for all audio

Wrecked Audio/ Discontinuation/

Noise only for D-TV

Wrecked Audio/ Discontinuation/

Noise only for Analog

Wrecked Audio/

Discontinuation/

Noise only for External Input

N

Replace Main B/D

Error Symptom

C. Audio Error

Established date

10/14

Content

Wrecked audio / Discontinuation / Noise

Revised date

Standard Repair Process

LGE Internal Use Only

Y

N

Check R/C itself

Operation

Y

Replace R/C

If R/C operate, Explain the customer cause is interference

from light in room.

Check R/C Operating

When turn off light

in room

Check & Replace

Baterry of R/C

Check & Repair Cable connection Connector solder

Check 3.5V

On Main B/D

☞A16

N

Check Voltage 19V of Adaptor

☞A13

Check IR

Output signal

N

Y

Replace

IR B/D

N

☞A16

Replace

Main B/D

Y

☞A16

End

Normal

Operating

Normal Voltage

Normal

Signal

Normal

Operating

Normal

Operating

End

Y

Error Symptom

D. Function Error

Established date

11/14

Content

Remote control & Local switch checking

Revised date

Standard Repair Process

LGE Internal Use Only

Check technical information

- Fix information

- S/W Version

N

Y

Check input

signal

Y

N

Check and fix

external device/cable

Replace Main B/D

Fix in

accordance

with technical

information

Signal

Input

Technical

information

External Input and

Component

Recognition error

HDMI

Recognition error

Error Symptom

D. Function Error

Established date

12/14

Content

External device recognition error

Revised date

Standard Repair Process

LGE Internal Use Only

Check location

of noise

Identify

nose type

Replace Main Board

Check location

of noise

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

※ 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.

Circuit

noise

Mechanical

noise

Error Symptom

E. Noise

Established date

13/14

Content

Circuit noise, Mechanical noise

Revised date

Standard Repair Process

LGE Internal Use Only

Replace module

Zoom part with exterior damage

Replace cabinet

Replace remote control

Replace stand

Standard Repair Process

Module

damage

Cabinet

damage

Remote

Control

damage

Stand

damage

Error Symptom

F. Exterior Defect

Established date

14/14

Content

Exterior defect

Revised date

LGE Internal Use Only

Contents of Standard Repair Process Detail Technical Manual

No. Error symptom Content Page Remarks

1

A. Video error_ No video/Normal audio

Check LCD back light with naked eye A1 2 LED driver B+ measuring method A2 3 Check White Balance value A3 4 Power voltage measuring method A4 6

A. Video error_ No video/Video lag/stop

TUNER input signal strength checking method A5 7 Version checking method A6

9

A. Video error_Color error

connection diagram A7

10

Check Link Cable (LVDS) reconnection condition

A8 A9

11

Adjustment Test pattern - ADJ Key A10

12 13

A. Video error_Vertical/Horizontal bar, residual image, light spot

connection diagram A8

14 Check Link Cable (LVDS) reconnection condition

A8

A9 15 Adjustment Test pattern - ADJ Key A10 16

Defected Type caused by T-Con/ Inverter/ Module

Exchange T-Con Board (1) A-1/5

17 Exchange T-Con Board (2) A-2/5

18

Exchange LED driver Board (PSU) A-3/5

Exchange Module itself (1) A-4/5

19 20 Exchange Module itself (2) A-5/5

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

LGE Internal Use Only

No. Error symptom Content Page Remarks

21

B. Power error_No power

Check front display LED A11 22 Check power input Voltage & ST-BY 3.5V A12 23 Checking method when power is ON A13 24 Power voltage measuring method A4

26

B. Power error_Off when on, off while viewing

POWER OFF MODE checking method A14

28 C. Audio error_No audio/Normal video

Checking method in Setting when there is no

audio

A15

29

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

remote control operation checking method A16

Contents of Standard Repair Process Detail Technical Manual

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

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Power On -> disjoint back case -> check lighting

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A1

Content

Check Back Light On with Naked eye

Revised date

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Measure DC Voltage applying to LED backlight from Main B/D

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A2

Content

Main Board to LED back light Voltage

Revised date

LGE Internal Use Only

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

2. Enter into White Balance of item 11

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

Standard Repair Process Detail Technical Manual

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A3

Content

Check White Balance value

Revised date

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Check LVDS Voltage 12V

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A4

Content

Power Voltage Measuring Method

Revised date

HD Model : 27 ~ 30 pin FHD Model : 48 ~ 51 pin

LGE Internal Use Only

Setting  Programmes  signal test  Select channel

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

Standard Repair Process Detail Technical Manual

Error Symptom

A. Video Error, Video lag/stop

Established date

A5

Content

Tuner Input Signal Strength Checking Method

Revised date

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Checking SW version method for remote control for adjustment

Press the IN-START with the remote control for adjustment

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A6

Content

Version Checking Method

Revised date

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

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

* Jack spec. : depending on Model

Error Symptom

A. Video Error, Vertical/Horizontal bar, Residual Image,

Light spot

Established date

A7

Content

connection diagram

Revised date

LGE Internal Use Only

1. Check and replace LVDS Cable

2. Check LVDS connection condition

Standard Repair Process Detail Technical Manual

Error Symptom

A. Video Error, Color Error

Established date

A8/

A9

Content

Check and replace Link Cable(LVDS) and contact condition

Revised date

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

You can view 10 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)

Error Symptom

A. Video Error, Color Error

Established date

A10

Content

Adjustment Test Pattern – ADJ Key

Revised date

LGE Internal Use Only

Solder defect, CNT Broken

T-Con 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)

LGE Internal Use Only

Abnormal Power Section

Solder defect, Short/Crack

Abnormal Power Section

Solder defect, Short/Crack

Fuse Open, Abnormal power section

Noise

GRADATION

Abnormal Display

Appendix : Exchange T-Con Board (2)

LGE Internal Use Only

Appendix : Exchange the Module (1)

Crosstalk Crosstalk

Press damage Press damage

Un-repairable Cases In this case please exchange the module.

Press damage

LGE Internal Use Only

Vertical Block

Source TAB IC Defect

Horizontal Block Gate TAB IC Defect

Gate TAB IC Defect

Vertical Line Source TAB IC Defect

Vertical Block

Source TAB IC Defect

Horizontal Block Gate TAB IC Defect

Horizontal line Gate TAB IC Defect

Gate TAB IC Defect

Horizontal Block Gate TAB IC Defect

Appendix : Exchange the Module (2)

Un-repairable Cases In this case please exchange the module.

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

ST-BY condition: Red

Front LED control :

Setting  Option  Standby Light  On/Off

Error Symptom

B. Power Error, No Power

Established date

A11

Content

Check front Display LED

Revised date

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Error Symptom

B. Power Error, No Power

Established date

A12/

A13

Content

Checking Method When Power is ON

Revised date

Check Voltage 19V of Adaptor Power

LGE Internal Use Only

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

2. Check the entry into adjustment item 3

Standard Repair Process Detail Technical Manual

Error Symptom

B. Power Error, Off when on, off whiling viewing

Established date

A14

Content

Power off Mode checking method

Revised date

LGE Internal Use Only

Check Connection from Main B/D to Speaker

Standard Repair Process Detail Technical Manual

Error Symptom

C. Audio Error, No Audio/Normal Video

Established date

A15

Content

Checking method in Setting when there is no audio

Revised date

LGE Internal Use Only

1

KEY2

2

3.5V_ST 3

GND

4

LED_R/BUZZ

5

IR

6

GND

1, 2. Check IR cable condition between IR & Main board

3. Check the ST-BY 3.5V on the terminal 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.

Standard Repair Process Detail Technical Manual

①

②

③

④

P4600

< Sub Ass’y>

< Main Ass’y>

Error Symptom

D. Function Error, No Response in remote control, Key error

Established date

A16

Content

remote control operation checking method

Revised date

LGE Internal Use Only

LG 43LH54, 49LH54 Schematic