LG 43LH615V-ZE Schematic

Internal Use Only

LED TV

SERVICE MANUAL

CHASSIS : LD66H

MODEL : 43LH60** 43LH60**-ZA/ZB/ZF

43LH615V 43LH615V-ZE

CAUTION

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

P/NO : MFL69504203 (1609-REV03)

CONTENTS

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

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

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

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

USB S/W DOWNLOAD

.............................................................................10

BLOCK DIAGRAM .................................................................................. 11

EXPLODED VIEW .................................................................................. 21

DISASSEMBLY ....................................................................................... 22

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 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 LD66H chassis.

2. Requirement for Test

Each part is tested as below without special appointment. (1) Operating Temperature : 0 °C to 40 °C (2) Operating Humidity : Less than 80% (3) Storage Temperature : -20 °C to 60 °C (4) Storage Humidity : Less than 85% (5) Power Voltage : Standard input voltage (100~240V@ 50/60Hz) Standard Voltage of each product is marked by models (6) Specification and performance of each parts are followed

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

(7) 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

4. Model General Specification

No. Item Specication Remarks

DTV & Analog (Total 37 countries)

DTV (MPEG2/4, DVB-T) : 26 countrie

Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bulgaria, France, Spain, Belgium, Luxemburg, Greece, Czech, Turkey, Morocco, Ireland, Latvia, Estonia, Lithuania, Poland, Portugal, Romania, Albania, Bosnia, Slovakia, Belarus

1 Market EU/CIS(PAL Market-37Countries)

DTV (MPEG2/4, DVB-T2) :11 countries

UK(Ireland), Sweden, Denmark, Finland, Norway, Ukraine, Kazakhstan, Russia, Italy, Croatia, Serbia

DTV (MPEG2/4, DVB-C) : 37 countries

Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bulgaria, France, Spain, Italy, Belgium, Russia, Luxemburg, Greece, Czech, Croatia, Turkey, Morocco, Ireland, Latvia, Estonia, Lithuania, Poland, Portugal, Romania, Albania, Bosnia, Serbia, Slovakia, Belarus, UK, Sweden, Denmark, Finland, Norway, Ukraine, Kazakhstan

DTV (MPEG2/4,DVB-S) : 37 countries

Germany, Netherland, Switzerland, Hungary, Austria, Slovenia, Bulgaria, France, Spain,Belgium, Luxemburg, Greece, Czech, Turkey, Morocco, Ireland, Latvia, Estonia, Lithuania, Poland, Portugal, Romania, Albania, Bosnia, Slovakia, Belarus, UK(Ireland), Sweden, Denmark, Finland, Norway, Ukraine, Kazakhstan,Russia, Italy, Croatia, Serbia

Supported satellite : 35 satellites

ABS1 75.0E, AMOS 4.0W, ASIASAT3S 105.5E, ASTRA 19.2E, ASTRA

23.5E, ASTRA 28.2E, ASTRA 4.8E, ATLANTIC BIRD2 8.0W, ATLANTIC BIRD3 5.0W, BADR 26.0E, DIRECTV-1R 56.0E, EUROBIRD 9A 9.0E, EUROBIRD3 33.0E, EUTELSAT 36 A/B 36.0E,EUTELSAT W2A 10.0E, EUTELSAT W3A 7.0E, EUTELSAT7WA 7.3WEUTELSAT 16.0E, EXPRESS AM1 40.0E, EXPRESS AM3 140.0E, EXPRESS AM33 96.5E, HELLASSAT 39.0E, HISPASAT 1CDE 30.0WHOTBIRD 13.0E, INTELSAT10&7 68.5E, INTELSAT15 85.2E, INTELSAT1R 50.0W, INTELSAT903 33.5W, INTELSAT904 60.0E, NILESAT 7.0W, NSS12 57.0E, THOR 0.8W, TURKSAT 42.0E,YAMAL201 90.0E, OTHER

Only for training and service purposes

- 6 -

No. Item Specication Remarks

(1) Digital TV

- DVB-T/T2

- DVB-C

2 Television system

3 Program coverage

4 Receiving system

- DVB-S/S2 (2) Analogue TV

- PAL/SECAM B/G/I/D/K

- SECAM L/L’

(1) Digital TV

- VHF, UHF

- C-Band, Ku-Band

(2) Analogue TV

-VHF : E2 to E12

-UHF : E21 to E69

-CATV : S1 to S20

-HYPER : S21 to S47

Analog : Upper Heterodyne Digital : COFDM, QAM

► 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 (Model : *L*V*-Z* (T2 only Model))

- 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

► DVB-C

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

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

► DVB-S/S2

- 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

5 SCART(N/A) DELETED

6 Video Input RCA(1EA) PAL, SECAM, NTSC4.43

7 Head phone out

8 Component Input (1EA)

9 HDMI Input (3EA)

10 Audio Input (3EA)

11 SPDIF out SPDIF out

12 USB (2EA) EMF, For SVC (download) JPEG, MP3

13 Ethernet Connect(1EA) Ethernet Connect

14 PCMCIA Card slot (1EA) PCMCIA slot

Antenna, AV, Component, HDMI1, HDMI2, HDMI3, USB1, USB2

Y/Cb/Cr Y/Pb/Pr

HDMI1-DTV HDMI2-DTV HDMI3-DTV

DVI Audio Component AV

4 System : PAL, SECAM, NTSC4.43, PAL60 Hybrid Type

Hybrid Type

L/R Input

Only for training and service purposes

- 7 -

* RF receiving coverage

Digital TV Analogue TV

Televison System DVB-T/T2

DVB-C DVB-S/S2

Programme Coverage VHF, UHF

C-Band, Ku-Band

Maximum number of storable programmes

External Antenna Impedance 75 Ω

DVB-T/T2/C & Analogue TV : 3,000

DVB-S/S2 : 6,000

PAL/SECAM B/G/I/D/K SECAM L/L’

VHF:E2 to E12, UHF : E21 to E69, CATV : S1 to S20, HYPER : S21 to S47

5. External Input Format

5.1. 2D Mode

(1) Component Video Input (Y, PB, PR)

No.

1. 720×480 15.75 60.00 SDTV, DVD 480i

2. 720×480 15.73 59.94 SDTV, DVD 480i

3. 720×480 31.47 59.94 480p

4. 720×480 31.50 60.00 480p

5. 720×576 15.62 50.00 SDTV, DVD 625 Line

6. 720×576 31.25 50.00 HDTV 576p

7. 1280×720 37.50 50.00 HDTV 720p

8. 1280×720 44.96 59.94 HDTV 720p

9. 1280×720 45.00 60.00 HDTV 720p

10. 1920×1080 28.12 50.00 HDTV 1080i

11. 1920×1080 33.75 60.00 HDTV 1080i

12. 1920×1080 33.72 59.94 HDTV 1080i

13. 1920×1080 56.25 50.00 HDTV 1080p

14. 1920×1080 67.43 59.94 HDTV 1080p

15. 1920×1080 67.50 60.00 HDTV 1080p

Resolution H-freq(kHz) V-freq(Hz)

Specication

Only for training and service purposes

- 8 -

(2) HDMI Input (DTV)

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

1. 640*480 31.46 59.94 SDTV 480P SDTV 480P

2. 640*480 31.50 60.00 SDTV 480P SDTV 480P

3. 720*480 15.73 59.94 SDTV, DVD 480I(525I) SDTV, DVD 480I(525I)

Spec. out but display4. 720*480 15.75 60.00 SDTV, DVD 480I(525I) SDTV, DVD 480I(525I)

5. 720*576 15.62 50.00 SDTV, DVD 576I(625I) 50Hz SDTV, DVD 576I(625I) 50Hz

6. 720*480 31.47 59.94 SDTV 480P SDTV 480P

7. 720*480 31.50 60.00 SDTV 480P SDTV 480P

8. 720*576 31.25 50.00 SDTV 576P SDTV 576P

9. 1280*720 44.96 59.94 HDTV 720P HDTV 720P

10. 1280*720 45.00 60.00 HDTV 720P HDTV 720P

11. 1280*720 37.50 50.00 HDTV 720P HDTV 720P

12. 1920*1080 28.12 50.00 HDTV 1080I HDTV 1080I

13. 1920*1080 33.72 59.94 HDTV 1080I HDTV 1080I

14. 1920*1080 33.75 60.00 HDTV 1080I HDTV 1080I

15. 1920*1080 26.97 23.98 HDTV 1080P HDTV 1080P

16. 1920*1080 27.00 24.00 HDTV 1080P HDTV 1080P

17. 1920*1080 33.71 29.97 HDTV 1080P HDTV 1080P

18. 1920*1080 33.75 30.00 HDTV 1080P HDTV 1080P

19. 1920*1080 56.25 50.00 HDTV 1080P HDTV 1080P

20. 1920*1080 67.43 59.94 HDTV 1080P HDTV 1080P

21. 1920*1080 67.50 60.00 HDTV 1080P HDTV 1080P

(3) HDMI Input (PC)

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

1 640 x 350 @70Hz 31.46 70.09 EGA

2 720 x 400 @70Hz 31.46 70.08 DOS

3 640 x 480 @60Hz 31.46 59.94 VESA(VGA)

4 800 x 600 @60Hz 37.87 60.31 VESA(SVGA)

5 1024 x 768 @60Hz 48.36 60.00 VESA(XGA)

6 1152 x 864 @60Hz 54.34 60.05 VESA

7 1280 x 1024 @60Hz 63.98 60.02 VESA(SXGA) FHD only

8 1360 x 768 @60Hz 47.71 60.01 VESA(WXGA)

9 1920 x 1080 @60Hz 67.5 60.00 WUXGA(CEA 861D) FHD only

Only for training and service purposes

- 9 -

USB S/W 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 Lower, it didn’t work. But your downloaded version is Higher, USB data is automatically detecting (Download Version High & Power only mode, Set is automatically Download)

(3) Show the message “Copying files from memory”.

(4) Updating is starting.

(5) Updating completed, the TV will restart automatically

(6) If your TV is turned on, check your updated version and Tool option. (explain the Tool option, 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 "Tool Option 1" and push "OK" key. (3) Punch in the number. (Each model has their number)

Only for training and service purposes

- 10 -

1. M2

BLOCK DIAGRAM

Only for training and service purposes

- 11 -

2. I2C

Only for training and service purposes

- 12 -

3. Power

Only for training and service purposes

- 13 -

4. Tuner

Only for training and service purposes

- 14 -

5. Video & Audio IN

Only for training and service purposes

- 15 -

6. AUDIO OUT

Only for training and service purposes

- 16 -

7. HDMI

Only for training and service purposes

- 17 -

8. Panel Interface

Only for training and service purposes

- 18 -

9. USB 2.0 / WiFi / IR-Key

Only for training and service purposes

- 19 -

10. CI

Only for training and service purposes

- 20 -

Stand Screw

Stand Base

+

Stand Body

500

200

400

540

121

200T

570

411

120

800

530

700

A2

A10

A9

521

LV1

820

900

810

910

AH1

901

902

Stand Screw

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 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.

Only for training and service purposes

- 21 -

DISASSEMBLY

1. Disassemble parts Back Cover

- Disassemble Total Screw No. : 42ea

1

2

1

2

1

3

1

4

- Screw : 13 ea - Screw : 4 ea

5

4

6

“A”

7

4

8

9

13

a

b b

a

b b

Only for training and service purposes

10

8

9

11

10

12

10

- Screw :9 ea

14

15 15

14

13

a

b

a

15

14

15

- Screw : 4 ea

b

- 22 -

TOP

BOTTOM

16







Only for training and service purposes

- 23 -

TROUBLE SHOOTING GUIDE

Only for training and service purposes

LGE Internal Use Only

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

Error

symptom

A. Video error

Video X / Audio O

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 Cable, Speaker Cable, IR B/D Cable…)

☞A9 ☞A1

Video X / Audio O

Audio O

Move to No Video /

No Audio Channel

Y

N

Check Back Light On with Naked eyes

☞A9

Check Power B/D 13V output

On

Normal

Voltage

Repair Power B/D or parts

Y N Check Power B/D

N

13V

Y

Replace Inverter or Module

Normal

Voltage

Repair or Replace Power B/D or parts

Y

N

End

Replace T-con /Main B/D or Module

1/14

※Precaution

Always check & record S/W Version and White Balance value before replace the Main B/D

☞A4 & A2

Replace Main B/D

1

Re-enter White Balance value

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

Video X / Audio X

Error

symptom

☞A9

Check Power B/D 13V output

A. Video error

Video X / Audio O

Normal

Voltage

Repair or Replace

Power B/D or parts

Y

N

Check and Replace Main B/D

Established

date

Revised date

End

2/14

2

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

☞ 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 error

Picture broken / Freezing

. By using Digital signal level meter . By using Diagnostics menu on OSD

( All Settings → Programmes → Programmes Tuning &Settings → Manual Tuning → Check the Signal )

- Signal strength (Normal : over 50%)

- Signal Quality (Normal: over 50%)

Check whether other equipments have problem or not.

(By connecting RF Cable at other equipment)

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

Normal

Picture?

N

Contact with signal distributor

or broadcaster (Cable or Air)

Y

S/W Version

☞ A4

Check

SVC

Bulletin?

Y

S/W Upgrade

Normal

Picture?

Y

Established

date

Revised date

N

Check

Tuner soldering

N

Replace

Main B/D

3/14

Y

Close

3

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

☞A6

Check color by input

-External Input

-COMPONENT

-AV

-HDMI

Error

symptom

Check error color input mode

Color

error?

☞ A7

※ Check the V

Y

x1 or EPI Cable and Connector

And Replace

N

Link Cable

External Input/

Component

error

A. Video error

Color error

Color

error?

N

Check external device and cable

Y

Replace Main B/D

External device

/Cable

normal

N

Established

date

Revised date 4/14

Color

error?

End

Y

Replace module Or T-Con B/D

N

Replace Main/T-con B/D

HDMI

error

Check external

device and cable

4

Request repair

for external

device/cable

N

External device

/Cable

normal

Y

Replace Main/T-con B/D

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

Error

symptom

Vertical / Horizontal bar, residual image,

A. Video error

light spot, external device color error

Vertical/Horizontal bar, residual image, light spot

☞A6

Check the color

- External input

- Component

- HDMI

Screen normal

Replace Module

N

Y

Check the connection of external device

Normal

N

Repair Request

External Device

External device screen error-Color error

External

Input error

Component

error

HDMI/

DVI

Check S/W Version

Check

version

Y

S/W Upgrade

Normal

screen?

Y

End

N

Check screen condition by input

-External Input

-Component

-HDMI/DVI

N

☞ A7

Y

Change Cable

Established

date

Revised date

Screen normal

End

N

Y

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, Component, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc.

- HDMI ULTRA HD Deep Color menu off

Replace Main B/D

Screen

normal?

Y

Request repair for

external device

Y

Screen

normal?

ReplaceModule

N

Replace

Main/T-con

B/D

N

Replace Main /T-con B/D

5/14

N

Screen normal

Y

End

5

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

symptom

☞A8

Check Logo LED

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

Check Power cord

was inserted properly

Error

Power LED

On?

N

Normal?

Y

Close

Y

N

☞A9

※

Check ST-BY Voltage

B. Power error

No power

DC Power on by pressing Power Key

On Remote control

Y

Normal

Y

voltage?

Established

Revised date

☞A9

Normal

operation?

N

Y

☞A9

Measure the each output

voltage of Power B/D

Normal

voltage?

N

date

Check Power On ‘”High”

Y

Replace Main B/D

OK?

Replace Main B/D

Y

6/14

Replace

Power

B/D

N

Replace Power B/D

6

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

Check outlet

Check A/C cord

Check for all 3- phase power out

Error

symptom

Error?

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

B. Power error

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

☞A10

N

Y

Check Power Off Mode

☞A9

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

※ Caution

Check and fix exterior of Power B/D Part

Established

Revised date 7/14

CPU

Abnormal

1

Normal

voltage?

N

Replace Power B/D

date

Replace Main B/D

Y

Replace Main B/D

Normal?

Replace Power B/D

Y

N

End

* Please refer to the all cases which

can be displayed on power off mode.

Status Power off List Explanation

"POWEROFF_REMOTEKEY" Power off by REMOTE CONTROL

"POWEROFF_OFFTIMER" Power off by OFF TIMER

"POWEROFF_SLEEPTIMER" Power off by SLEEP TIMER "POWEROFF_INSTOP" Power off by INSTOP KEY "POWEROFF_AUTOOFF" Power off by AUTO OFF

Normal

Abnormal

"POWEROFF_ONTIMER" Power off by ON TIMER "POWEROFF_20V_DET" Power off by AC OFF "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

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

7

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

No audio Screen normal

Error

C. Audio Error

symptom

Audio X / Video O

☞A11 ☞A12+A9

Check menu > Sound Out set CORRECT output

Correct

N

Set correct output

Check audio B+ 13V

Y

of Power Board

Established

date

Revised date

Normal

voltage

Replace Power Board and repair parts

Y

N

8/14

Check Speaker disconnection

Replace Speaker

8

Y

N

Replace MAIN Board

End Disconnection

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

 abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio

Check input signal

-RF

-External Input signal

Error

symptom

Signal

normal?

N

Wrecked audio/ discontinuation/noise

Y

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

cable/ANT provider

(In case of External Input signal error)

Check and fix

external device

C. Audio Error

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

Established

date

Revised date 9/14

Check and replace speaker and connector

Replace Main B/D

Connect and check

other external device

☞A12+A9

Check audio B+ Voltage (13V)

Normal

voltage?

N

Replace Power B/D

Replace Main B/D

Normal

audio?

Y

N

Y

End

Check and fix external device

9

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

Error

symptom

Remote control & Local switch checking

1. Remote control(R/C) operating error

Check R/C itself

Operation

Check R/C Operating

When turn off light

in room

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

from light in room.

Normal

operating?

N

Check & Replace

Baterry of R/C

Normal

operating?

Replace R/C

Check & Repair

Y

Cable connection Connector solder

Y

N

Close

D. Function Error

☞A13

Check Stan-by

Normal

operating?

Close

N

Voltage On

Y

Established

date

Revised date

☞A13 ☞A13

N

Y

Check IR

Output signal

Main B/D

Normal

Voltage?

☞A9

Check Stan-by voltage on Power B/D

Replace Power B/D or Replace Main B/D

10/14

Replace

Main B/D

Normal

Signal?

N

Repair/Replace

IR B/D

Y

10

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

Error

symptom

2.Wifi operating error

Check the

INSTART menu

☞A4

Wi-Fi Mac value

is “NG”?

☞A15

Check & Repair

Wifi cable

connection

☞A4

Wi-Fi Mac value

is “NG”?

Y

D. Function Error

Wi-Fi operating checking

☞A15

N

Check the Wi-Fi

Wafer pin

Close

Established

date

Revised date

Normal

Voltage?

Y

Close

N

11/14

Replace

Main B/D

Y

Change the Wifi

assy

11

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

Check input signal

Error

symptom

Y

Signal

input?

N

Check and fix

external device/cable

D. Function Error

External device recognition error

Check technical information

- Fix information

- S/W Version

Technical

information?

Y

Fix in

accordance

with technical

information

External Input and

N

Component

Recognition error

DVI, Optical

Recognition error

Established

date

Revised date 12/15

Replace Main B/D

HDMI/

Replace Main B/D

12

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

Identify noise type

Error

symptom

Circuit

noise

Mechanical

noise

Circuit noise, mechanical noise

Check location of noise

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

E. Noise

Established

date

Revised date 13/14

Replace PSU

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

OR

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

13

Standard Repair Process

Only for training and service purposes

LGE Internal Use Only

Error

symptom

Zoom part with exterior damage

F. Exterior defect

Exterior defect

Module

damage

Cabinet

damage

Remote

control

damage

Replace module

Replace cabinet

Replace remote control

Established

date

Revised date 14/14

Stand

dent

Replace stand

14

Contents of Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

No. Error symptom Content Page Remarks

1

A. Video error_ No video/Normal audio

2 Check White Balance value A2

3

A. Video error_ video error /Video lag/stop

4 Version checking method A4

Check back light with naked eye A1

TUNER input signal strength checking method

A3

5 Tuner Checking Part A5

A. Video error _Vertical/Horizontal bar,

6

residual image, light spot

7 A. Video error_ Color error

connection diagram A6

Check Link Cable (EPI) reconnection condition

A7

Exchange Module (1) A-1/2

8 <Appendix>

Exchange Module (2) A-2/2

Contents of Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

No. Error symptom Content Page Remarks

9

Check front display LED A8

B. Power error_ No power

10 Check power input Voltage & ST-BY A9

11

12

13

14

B. Power error_Off when on, off while viewing

C. Audio error_ No audio/Normal video

D. Function error

POWER OFF MODE checking method A10

Checking method in menu when there is

no audio

Voltage and speaker checking method when there is no audio

Remote control operation checking method

A11

A12

A13

15 Wi-Fi operation checking method A14

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

A. Video error_No video/Normal audio

Check back light with naked eye

Established

date

Revised

date

A1

After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations.

A1

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

A. Video error_No video/Normal audio

Check White Balance value

Established

date

Revised

date

A2

Entry method

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

2. Enter into White Balance of item 13.

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

A2

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

A. Video error_Video error, video lag/stop

TUNER input signal strength checking method

All Settings Channels  Channel Tuning  Manual Tuning Select Channel

Established

date

Revised

date

A3

Signal Strength is too strong : Use attenuator (-10dB, -15dB, -20dB etc.)

Signal Strength is too weak : Use Signal Booster

A3

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

Version

A. Video error_Video error, video lag/stop

Version checking method

Established

date

Revised

date

A4

Press the IN-START with the remote control for adjustment

A4

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

A. Video error_Video error, video lag/stop

TUNER checking part

Established

date

Revised

date

A5

Checking method:

1. Check the signal strength or check whether the screen is normal when the external device is connected.

2. After measuring each voltage from power supply, finally replace the MAIN BOARD.

A5

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

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

connection diagram (1)

Established

date

Revised

date

A6

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

A6

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

Check Link Cable (EPI) reconnection condition

A. Video error_Color error

Established

date

Revised

date

A7

Check the contact condition of the Link Cable, especially dust or mis insertion.

A7

Appendix : Exchange the Module (1)

Only for training and service purposes

LGE Internal Use Only

Vertical abnormal display

Crosstalk

Brightness difference

Press damage

Line Dim

Crosstalk

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

Burnt

A – 1/2

Appendix : Exchange the Module (2)

Only for training and service purposes

LGE Internal Use Only

Angle view Color difference Brightness dot noise Half dead

Brightness difference

Mura

Green Noise on power on/off time

Line Defect

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

A – 2/2

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

B. Power error _No power

Check front Power Indicator

Established

date

Revised

date

A8

ST-BY condition: On or Off

Power ON condition: Turn Off

A8

Standard Repair Process Detail Technical Manual

1

Power

ON/OFF

2

PDIM #2

3

GND

4

D13.2V

5

D13.2V

6

D13.2V

7

A13.2V

8

A13.2V

9

GND

10

GND

11

MS

12

PDIM #1

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

Check the Power output voltage and St-by voltage

B. Power error _No power

Chech the DC 13V.

Established

date

Revised

date

A9

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

B. Power error _Off when on, off whiling viewing

POWER OFF MODE checking method

Established

date

Revised

date

A10

Entry method

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

adjustment

2. Check the entry into adjustment item 3`

A10

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

C. Audio error_No audio/Normal video

Checking method in menu when there is no audio

Established

date

Revised

date

A11

Checking method

1. Press the Setting button on the remote control

2. Select the Sound function of the Menu

3. Select the Sound Out

4. Select TV Speaker

A11

Standard Repair Process Detail Technical Manual

1

Power

ON/OFF

2

PDIM #2

3

GND

4

D13.2V

5

D13.2V

6

D13.2V

7

A13.2V

8

A13.2V

9

GND

10

GND

11

MS

12

PDIM #1

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

②

C. Audio error_No audio/Normal video

Checking Voltage and speaker

①

Established

date

Revised

date

A12

Checking methond when no audio

① Check Main B/D 13V

② Check Power B/D 13V

After connect speaker and contact the output terminal of the speaker with GND, if there is sound ouput

noise, we conclude the speaker works well.

A12

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

Remote control operation checking method

①

Checking order

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

2. Check the st-by 3.5V on the pin 18

D. Function error

②

Established

date

Revised

date

③

A13

P4001

1 +3.4V_WIFI 2 WIFI_DM 3 WIFI_DP 4 GND 5 WOL/WIFI_POWER_ON 6 GND 7 NC 8 GND 9

12 EYE_SDA 13 EYE_SCL 14 GND 15 IR

16 LED_R

17 GND 18 +3.4V_ST 19 KEY2 20 KEY1 21 GND

A13

Standard Repair Process Detail Technical Manual

Only for training and service purposes

LGE Internal Use Only

Error Symptom

Content

①

Wi-Fi operation checking method

D. Function error

②

Established

date

Revised

date

③

A14

P4001

1 +3.4V_WIFI 2 WIFI_DM 3 WIFI_DP 4 GND 5 WOL/WIFI_POWER_ON 6 GND 7 NC 8 GND 9

12 EYE_SDA 13 EYE_SCL 14 GND 15 IR

16 LED_R

17 GND 18 +3.4V_ST 19 KEY2 20 KEY1 21 GND

Checking order

1. Check the IR cable condition

2. Check the Wifi Cable condition

3. Check the voltage 3.4V_WIFI on P4101

A14