LG 49UJ740V Schematic

Internal Use Only

LED TV

SERVICE MANUAL

CHASSIS : UD71P

MODEL : 49UJ740V 49UJ740V-ZA

CAUTION

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

P/NO : MFL69902506 (1703-REV00)

CONTENTS

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

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

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

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

SOFTWARE UPDATE ............................................................................ 10

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

EXPLODED VIEW .................................................................................. 19

DISASSEMBLY GUIDE........................................................................... 20

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 UD71P chassis.

2. Requirement for Test

Each part is tested as below without special notice. (1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C (2) Relative Humidity: 65 % ± 10 % (3) Power Voltage

: Standard input voltage (AC 100~240 V, 50/60 Hz) * Standard Voltage of each products is marked by models.

(4) Specification and performance of each parts are followed

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

(5) The receiver must be operated for about 20 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

- Wireless : Wireless HD Specification (Option)

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(PAL Market-36Countries)/CIS + Morocoo(Africa)

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

- DVB-T2*

2 Broadcasting system

3 Channel coverage

4 Receiving system

5 Head phone out

6 HDMI Input (4EA) HDMI1, HDMI2, HDMI3, HDMI4

7 SPDIF out (1EA) SPDIF out

8 USB (3EA) EMF, For SVC (download)

9 Ethernet Connect(1EA) Ethernet Connect STP cable.

10 PCMCIA Card slot (1EA) PCMCIA slot

- DVB-C

- DVB-S/S2*

(2) Analogue TV

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

- SECAM L

(1) Digital TV

1) DVB-T/T2

- VHF III : 174~230MHz

- UHF IV : 470~606MHz

- UHF V : 606~862MHz

- S Band II : 230~300MHz

- S Band III : 300 ~470MHz

2) DVB-C

- 46 ~ 890MHz

3) DVB-S/S2

- 950~2150MHz

(2) Analogue TV

- 46~862MHz

Analog : Upper Heterodyne Digital : COFDM, QAM

Antenna, HDMI1, HDMI2, HDMI3, HDMI4, USB1, USB2, USB3

*:Depending on country

▶ DVB-T

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

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

▶ DVB-T2 (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 :

4.0Msymbols/s to 7.2Msymbols/s

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

▶ DVB-S/S2

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

Only for training and service purposes

- 7 -

5. External Input Format

5.1. 2D Mode

(1) HDMI Input (DTV)

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

1 640*480 31.469 59.94 25.125 SDTV 480P

2 640*480 31.5 60.00 25.125 SDTV 480P

3 720*480 15.73 59.94 13.500 SDTV 576P

Spec. out but display4 720*480 15.75 60.00 13.514 HDTV 720P

5 720*576 15.625 50.00 13.500 HDTV 720P

6 720*480 31.47 59.94 27.00 HDTV 720P

7 720*480 31.5 60.00 27.027 HDTV 1080I

8 720*576 31.25 50.00 27.00 HDTV 1080I

9 1280*720 44.96 59.94 74.176 HDTV 1080I

10 1280*720 45.00 60.00 74.25 HDTV 1080P

11 1280*720 37.50 50.00 74.25 HDTV 1080P

12 1920*1080 28.125 50.00 74.25 HDTV 1080P

13 1920*1080 33.72 59.94 74.176 HDTV 1080P

14 1920*1080 33.75 60.00 74.25 HDTV 1080P

15 1920*1080 26.97 23.976 63.296 HDTV 1080P

16 1920*1080 27.00 24.000 63.36 HDTV 1080P

17 1920*1080 33.71 29.97 79.120 UDTV 2160P

18 1920*1080 33.75 30.00 79.20 UDTV 2160P

19 1920*1080 56.25 50.00 148.50 UDTV 2160P

20 1920*1080 67.432 59.94 148.350 UDTV 2160P

21 1920*1080 67.50 60.00 148.50 UDTV 2160P

22 1920*1080 135.00 120.00 297.00 UDTV 2160P(DVB)

23 1920*1080 135.00 119.88 296.703 UDTV 2160P

24 1920*1080 112.5 100.00 297.00 UDTV 2160P

25 3840*2160 53.95 23.98 296.703 UDTV 2160P

26 3840*2160 54.00 24.00 297.00 UDTV 2160P

27 3840*2160 56.25 25.00 297.00 UDTV 2160P

28 3840*2160 61.43 29.97 296.703 UDTV 2160P

29 3840*2160 67.50 30.00 297.00 UDTV 2160P

30 3840*2160 112.50 50.00 594.00 UDTV 2160P(DVB)

31 3840*2160 134.865 59.94 593.407 UDTV 2160P

32 3840*2160 135.00 60.00 594.00 UDTV 2160P

33 4096*2160 53.95 23.98 296.703 UDTV 2160P

34 4096*2160 54.00 24.00 297.00 UDTV 2160P

35 4096*2160 56.25 25.00 297.00 UDTV 2160P

36 4096*2160 61.43 29.97 296.703 UDTV 2160P

37 4096*2160 67.50 30.00 297.00 UDTV 2160P

When HDMI1,2,3 UHD DEEP COLOUR ON

When HDMI1,2,3,4 UHD DEEP COLOUR ON

Only for training and service purposes

- 8 -

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

38 4096*2160 112.50 50.00 594.00 UDTV 2160P

39 4096*2160 134.865 59.94 593.407 UDTV 2160P

40 4096*2160 135.00 60.00 594.00 UDTV 2160P

(4) HDMI Input (PC)

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

1 640*350 31.46 70.09 25.17 EGA

2 720*400 31.46 70.08 28.32 DOS

3 640*480 31.46 59.94 25.17 VESA(VGA)

4 800*600 37.87 60.31 40.00 VESA(SVGA)

5 1024*768 48.36 60.00 65.00 VESA(XGA)

6 1360*768 47.71 60.01 84.75 VESA(WXGA)

7 1152*864 54.34 60.05 80.00 VESA

8 1280*1024 63.98 60.02 109.00 SXGA Support to HDMI-PC

9 1920*1080 67.50 60.00 158.40 WUXGA(Reduced Blanking)

10 3840*2160 54.00 24.00 297.00 UDTV 2160P

11 3840*2160 56.25 25.00 297.00 UDTV 2160P

12 3840*2160 67.50 30.00 297.00 UDTV 2160P

13 4096*2160 53.95 23.97 296.70 UDTV 2160P

14 4096*2160 54.00 24.00 297.00 UDTV 2160P

When HDMI1,2,3,4 UHD DEEP COLOUR ON

Only for training and service purposes

- 9 -

SOFTWARE UPDATE

1. USB

(1) Insert the USB memory Stick to the USB port. (2) Automatically detect the SW Version and show the below

message

(3) Click [YES]: initiate the download and install of the update.

(4) Click [Check Now]: move to “About This TV” page for

update.

(5) TV is updating.

2. NSU

(1) Menu -> All Settings -> General -> About This TV

(2) Click [CHEK FOR UPDATES] : system check newest

version

(3) Click [DOWNLOAD AND INSTALL] (4) TV is updating

(6) After finished the update, below Pop-up appear.

(7) Click [Yes] : TV will be DC OFF -> ON (8) After TV turned on, Check the updated SW Version and

Tool Option.

Only for training and service purposes

- 10 -

(5) After finished the update, below Pop-up appear

(6) Turn OFF the TV and On. Check the updated SW Version

and Tool Option

OCP

1.5A

Audio 1 AM P

(NTP7515D)

IC101

M16+

IF (+/-)

USB1 (3.0)

OPTIC

LAN

DDR3 2133 X 16

(512MB X 2EA)

HDMI1 (2.0)

HDMI2 (2.0)

HDMI3 (2.0)

SYSTEM EEPROM

(256Kb)

USB2 (2.0)

USB3 (2.0)

eMMC

(4GB)

Sub Micom

(RENESAS

R5F1000G)

DDR3 2133 X 16

(512MB X 2EA)

X_TAL

24MHz

I2S Out

H/P

AV

R

E

A

R

S

I

D

E

R

E

A

R

(H)

HP

AMP

SPDIF OUT

BLUTOOTH

IR / KEY/EYE

WIFI

SUB

ASSY

IR

KEY

Tuner : I2C 5

I2C

CVBS/SIF

COMP

(ARC)

X_TAL

32.768kHz

OCP

1.5A

OCP

1.5A

Component Spec Out in North America

HDMI4 (2.0)

Tuner

(H-NIM)

1. SOC Block Diagram

BLOCK DIAGRAM

Only for training and service purposes

- 11 -

M16+

AN31 [DMD_ADC_INP]

AN32 [DMD_ADC_INN]

TDJN-G501D

[+3.3V_LNA_TU] 3

+3.3V_TUNER

[I2C_SCL5_TU] 1

[I2C_SDA5_TU] 2

[IF_AGC_TU] 5

FILTER

IF_P

IF_N

IF_AGC

ADC_I_INP

ADC_I_INN

I2C_SCL5

I2C_SDA5

AH25[SCL5]

AH26[SDA5]

AL24 [CVBS_IN1]

AL31[IF_AGC]

[IF_P] 7

[IF_N] 8

+3.3V_TUNER

1.2Kȳ

[ICVBS] 4

+3.3V_TUNER

TR

33 ȳ

2. Tuner

Only for training and service purposes

- 12 -

M16+

AM24 [CVBS_IN2]

AV_CVBS_IN

AV1

Phone JACK

Component 1

Phone JACK

AV1_CVBS_IN_SOC

AM20 [SOY1_IN]

AN20 [Y1_IN]

AL21 [PB1_IN]

AM22 [PR1_IN]

COMP2_Pb

COMP2_Y

COMP2_Pr

COMP2_SOG2_IN_SOC

COMP2_Y_IN_SOC

COMP2_Pb_IN_SOC

COMP2_Pr_IN_SOC

V

Jack Side SOC Side

SPDIF_OUT

SPDIF OUT

H/P JACK

HP_LOUT_JACK

HP_ROUT_JACK

AM14 [IEC958OUT]

AL15 [AUDA_OUTL]

AM15 [AUDA_OUTR]

SPDIF_OUT_ARC

[PHY0_ARC_OUT]

COMP2/AV_L_IN

COMP2/AV_R_IN

AL18 [AUAD_L_CH2_IN

AM18 [AUAD_R_CH2_IN]

AUAD_L_CH2_IN

AUAD_R_CH2_IN

HP AMP

TPA6138

ARC OUT

(HDMI2)

Front Speaker

MICOM

AMP_RESET

[SCK]

[LRCK]

[DACLRCH]

[I2C_SCL_0/SDA_0]

I2S

[GPIO23]

Audio

AMP

NTP7515

Component/AV Spec. out in Europe

Component Spec Out in North America

AMP_MUTE

(WOOFER_MUTE)

3. Video & Audio IN/OUT

Only for training and service purposes

- 13 -

CEC_REMOTE

MICOM

Port_4

DDC_I2C_4

HDMI_HPD_4

HDCP1.4

HDCP2.2

M16+

LG1313

HDMI 2

(2.0)_V

ARC

HDMI 1

(2.0)_V

CEC_REMOTE

Port_2

DDC_I2C_2

SPDIF_OUT_ARC

HDMI_HPD_2

CEC_REMOTE

Port_1

DDC_I2C_1

HDMI_HPD_1

HDMI2.0

LGE PHY

HDCP1.4

HDCP2.2

HDCP1.4

HDCP 2.2

HDMI2.0

LGE PHY

HDMI2.0

LGE PHY

+5V

HDMI 4

(2.0)_H

HDCP1.4

HDCP2.2

HDMI 3

(2.0)_H

CEC_REMOTE

Port_3

DDC_I2C_3

SPDIF_OUT_ARC

HDMI_HPD_3

HDMI2.0

LGE PHY

+5V

[HDMI2_3_HPD]

[HDMI2_3_SDA]

[HDMI2_3_SCL]

[HDMI2_2_HPD]

[HDMI2_2_SDA]

[HDMI2_2_SCL]

[HDMI2_1_HPD]

[HDMI2_1_SDA]

[HDMI2_1_SCL]

[HDMI2_0_HPD]

[HDMI2_0_SDA]

[HDMI2_0_SCL]

[PHY0_ARC_OUT]

4. HDMI

Only for training and service purposes

- 14 -

IR + Wi-Fi /BT

Wafer 25P

P4000

[UART0_RXD/GPIO106]

USB3.0_1_TX_DP0 / DM0

USB3.0_1_RX_DP0 / DM0

USB3.0_1_DP0 / DM0

[USB3_0_TX0_P / M]

RS232 IC

IC7200

WIFI_DP / DM

MICOM

IC3000

WOL/WIFI_POWER_ON

[USB2_2_DP0 / DM0]

SOC_RX/TX

[USB3_0_DP0 / DM0]

[USB3_0_RX0_P / M]

[USB2_1_DP0 / DM0]

USB2.0_2_DP1 / DM1

USB2.0_3_DP0 / DM0

[USB2_0_DP0 / DM0]

[UART1_RXD / TXD]

Debug Wafer

P202

UART1_RX/TX

JK6200

RS232C phone Jack

SOC_RX/TX

UART wafer

P3401, P3402

SOC_RX/TX

(*) US model only

USB 1

(3.0)_V

USB 2

(2.0)_H

USB 3

(2.0)_H

WIFI_EN

+3.5V_WIFI

OCP BD224G

[GPIO90]

USB_CTL1

+5V_USB_1

OCP BD224G

[GPIO95]

USB_CTL2

+5V_USB_2

OCP BD224G

[GPIO34]

USB_CTL3

+5V_USB_3

[UART0_TXD/GPIO105]

M16+

LG1313

5. USB / Wi-Fi / M-Remote / UART

Only for training and service purposes

- 15 -

[SJ80/UJ75 Main]

13.2V

3.3V Normal

3A

0.9V_CPU DC DC

3A

1.8V IO DC DC

3A

1.5V DDR DC DC

3.5A

0.9V_CORE DC

DC

10A

Tuner_2.5V

2A

ETH

3.5V ST-BY

4A

Japan option

5V Normal

6A

WIFI

Panel_VCC

LNB

MICOM/IR/ETC

SOC-M16P

1.2V DEMOD LDO

2A

0.9V DDR&C4TX

LDO 1.5A

EPI_C4TX_1.2V

LDO 2A

AUDIO AMP. IC

FRONT

6. Power Block

Only for training and service purposes

- 16 -

+3.3V_NORMAL

ZUZr˟

IC102

NVRAM

ZUZr˟

+3.3V_NORMAL

ZZ˟

+3.3V_NORMAL

ZUZr˟

IC5400

NTP7515D(AMP)

100 ˟

TUNER (Demod)

YU^r˟

+3.3V_TU

IC101

M16+

IC3000

R5F100GEAFB(MICOM)

IC6900

LNB

IR / KEY/EYE

XWW˟

ZUZr˟

EYE_I2C_SDA

EYE_I2C_SCL

+3.5V_ST

33pF

Cap Ready

0x56

0x52

0xC

A

0x10

0xA0

Device

addres

s

I2C_SCL4: AJ21[SCL4]

I2C_SDA4: AH21[SDA4]

I2C_SCL1: AK22[SCL1]

I2C_SDA1: AJ22[SDA1]

I2C_SCL3: AH24[SCL3]

I2C_SDA3: AJ24[SDA3]

I2C_SCL0: AK23[SCL0]

I2C_SDA0: AJ23[SDA0]

I2C_SCL2: AH23[SCL2]

I2C_SDA2: AH22[SDA2]

I2C_SCL5: AH25[SCL5]

I2C_SDA5: AH26[SDA5]

Tuner

XUYr˟GOl|P

+3.3V_TU

ZZ˟

47pF

+3.3V_NORMAL

ZUZr˟

Module

P7601 (Vx1 ˀ 51Pin wafer)

IC5300

NTP7515D(AMP)

0x54

100 ˟

33pF

0xC0

7. I2C Map

Only for training and service purposes

- 17 -

24MHz

xTAL

CTOP_GFx_R10

GPUPLL

CORE_PLL

CTOP_FMC_R08/09/10

M0

M1

EMMC

CORE

AUD

ESM

CTOP_GFx_R10[21] ck_mux_pll_sel_m0 : 0: DDR_M0PLL, 1: DDR_M1PLL

DDR_M1PLL

1308MHz(1056MHz)

200MHz

396MHz

552MHz

264MHz

DCO DISP PLL C4Tx

27 MHz 594 MHz

1/n

648 MHz

1

584 MHz

2

208MHz

CTOP_FME0_R13/14/15

CODEC PLL

2016MHz

CPU_PLL

CODEC_PLL

2400MHz

CPUBUS

1308MHz(1056MHz)

528MHz

2616MHz(2112MHz)

GFx

600MHz

1/n

TE

GPU

480MHz

648MHz

CTOP_GFx_R10[19] ck_mux_pll_sel_m1 : 0: DDR_M0PLL, 1: DDR_M1PLL

CTOP_GFx_R10[9:8] ck_mux_pll_sel_esm : 0: CORE_PLL, 1: CODEC_PLL, 2:DDR_M1PLL

CTOP_GFx_R10[17:16] ck_mux_pll_sel_lbus : 0: CORE_PLL, 1: CODEC_PLL , 2:DDR_M1PLL

[27:26] ck_mux_pll_sel_dco : 0: CODEC_PLL, 1: CORE_PLL, 2: DDR_M1PLL

CTOP_GFx_R16/17/18

CTOP_GFx_R00/01/02

CTOP_DPE_R28,29,30

CTOP_GFx_R06/07/08

CTOP_GFx_R10[31:30] ck_mux_pll_sel_core : 0: CORE_PLL, 1: CODEC_PLL, 2:DDR_M1PLL

CTOP_GFx_R10[2:1] ck_mux_pll_sel_emmc : 0: CODEC_PLL, 1: CORE_PLL , 2:DDR_M1PLL

CTOP_GFx_R10[15:14] ck_mux_pll_sel_emmc : 0: CODEC_PLL, 1: CORE_PLL , 2:DDR_M1PLL

1/n

CPU

CTOP_GFx_R03/04/05

DDR_M0PLL

1/

2

1/

2

1/

2

AUD

8. Clock source and frequency inside chip

Only for training and service purposes

- 18 -

400

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.

901

902

951

952

800

120

521

121

LV2

540

571

LV1

530

570

820

500

200A

200

700

A10

Only for training and service purposes

- 19 -

AR2

DISASSEMBLY GUIDE

Detach tape

1. After Screw Disassemble, please remove B/C from Module

- Screw : 15 ea

1 1 1

2. Detach Tape

1

2

1

Only for training and service purposes

- 20 -

3. Remove all sort of cable

4. IR assy, WiFi PCB assy disassembly

Remove IR cable and Disassemble Latch (1ea)

3

Disassemble screw (1ea) and Remove wi-fi cable

Only for training and service purposes

- 21 -

5. Screw disassembly

4

-Screw : 9 ea

6. Speaker disassembly

Only for training and service purposes

- 22 -

7. Screw disassembly

-Screw : 8 ea

6

5

6

Only for training and service purposes

- 23 -

TROUBLE SHOOTING GUIDE

LGE Internal Use Only

Contents of Standard Repair Process

LGE Internal Use Only

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

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

5

6

7

8 9 Wrecked audio/discontinuation/noise 9

10 11

12

A. Video error

B. Power error

C. Audio error

D. Function error

No video/Normal audio 1

Vertical/Horizontal bar, residual image, light

spot, external device color error

No power 6 Off when on, off while viewing, power auto

on/off No audio/Normal video 8

Remote control & Local switch checking 10

MR15RA operating checking 11

Wifi operating checking 12

5

7

13 External device recognition error 13 14 E. Noise Circuit noise, mechanical noise 14 15 F. Exterior error Exterior defect 15

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

Standard Repair Process

LGE Internal Use Only

Error

symptom

A. Video error

No video/ Normal audio

Established

date

Revised date

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

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

☞A18 ☞A1

N

Y

Check Back Light On with naked eye

☞A18

On

Check Power Board 13.2V output

Normal voltage

Repair Power Board or parts

Y N Check Power

Y

N

Board

13.2V etc.

Replace Inverter or module

Normal

voltage

N

Repair Power Board or parts

End

Y

Replace T-con/Main Board or module

No video Normal audio

Normal

audio

Move to No video/No audio

1/15

※Precaution

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

☞A4 & A2

Replace Main Board

1

Re-enter White Balance value

Standard Repair Process

LGE Internal Use Only

Error

symptom

No Video/ No audio

☞A18

Check various voltages of Power Board (13.2V…)

A. Video error

No video/ No audio

Normal

voltage?

Replace Power Board and repair parts

Y

N

Check and replace MAIN B/D

Established

date

Revised date

End

2/15

2

Standard Repair Process

LGE Internal Use Only

☞ A3

Check RF Signal level

Normal

Signal?

N

Check RF Cable

Connection

1. Reconnection

2. Install Booster

Y

Error

symptom

A. Video error

Picture broken/ Freezing

Established

date

Revised date

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

( Advanced→ Channels→ Channel Tuning→ Manual Tuning → Check the Signal )

- Signal strength (Normal : over 50%)

- Signal Quality (Normal: over 50%)

Check whether other equipments have problem or not.

(By connecting RF Cable at other equipment)

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

☞ A4

Normal

Picture?

N

Y

S/W Version

Check

SVC

Bulletin?

Y

N

Check

Tuner soldering

N

Y

3/15

Close

Normal

Picture?

Y

Close

N

Contact with signal distributor

or broadcaster (Cable or Air)

3

S/W Upgrade

Normal

Picture?

Y

Close

N

Replace

Main B/D

Standard Repair Process

LGE Internal Use Only

☞A6

Check color by input

-External Input

-COMPONENT

-AV

-HDMI

☞A8

Check Test pattern

Error

symptom

Color

error?

N

Check error color input mode

A. Video error

☞ A7

※ Check

and replace

Y

Link Cable (EPI or Vx1 Cable) and contact condition

External Input/

Component

error

Color error

Color

error?

N

Check external device and cable

Y

Replace Main B/D

Established

date

Revised date

External device

/Cable

normal

N

Color

error?

End

Y

Replace module

N

Replace Main/T-con B/D

4/15

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

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 color condition by input

-External Input

-Component

-HDMI

☞A8

Check Test pattern

Screen

normal?

N

Replace module

Check external

Y

device connection condition

Normal?

N

Request repair

for external device

External device screen error-Color error

Check screen condition by input

Check S/W Version

Check

version

Y

S/W Upgrade

N

-External Input

-Component

-HDMI/DVI

Component

☞ A7

Check and

Y

replace Link Cable

External

Input

error

Established

date

Revised date

Y

N

Replace Main/T-con B/D

For LGD panel

Replace Main B/D

Screen

normal?

End

For other panel

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.

Screen

normal?

Request repair for external device

N

Y

5/15

Replace Module

N

Screen

normal?

Y

End

Replace Main/T-con B/D

Normal

screen?

End

N

Y

5

HDMI/

DVI

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.

Y

Screen

normal?

N

Replace Main /T-con B/D

Standard Repair Process

LGE Internal Use Only

☞A17

Check Logo LED

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

Error

symptom

Power LED

On?

N

Check Power cord was inserted properly

Normal?

N

Y

Close

Y

Check ST-BY 3.5V

☞A18

B. Power error

No power

DC Power on by pressing Power Key On Remote control

Normal

voltage?

Y

N

Y

Established

date

Revised date

☞A18

Y

N

Check Power On ‘”High”

Replace Main B/D

Normal

operation?

☞A18

Measure voltage of each output of Power B/D

N

Y

Replace Main B/D

Normal

voltage?

Replace Power B/D

OK?

Y

6/15

Replace

Power B/D

Replace Power B/D

6

Standard Repair Process

LGE Internal Use Only

Check outlet

Check A/C cord

Check for all 3- phase power out

Error

symptom

Error?

Y

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

B. Power error

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

☞A19

N

Check Power Off Mode

☞A18

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

※ Caution

Check and fix exterior of Power B/D Part

Abnormal

Established

date

Revised date

CPU

1

Normal

voltage?

N

Replace Power B/D

Replace Main B/D

Y

Replace Power B/D

Replace Main B/D

Normal?

N

7/15

Y

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_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

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

7

Standard Repair Process

LGE Internal Use Only

No audio Screen normal

Error

C. Audio error

symptom

No audio/ Normal video

☞A20 ☞A21+A18

Check user menu > Speaker off

Off

Y

Cancel OFF

Check audio

N

13.2V of Power Board

Established

date

Revised date

Normal voltage

Replace Power Board and repair parts

Y

N

8/15

Check Speaker disconnection

Disconnection

Y

Replace Speaker

8

N

Replace MAIN Board

End

Standard Repair Process

LGE Internal Use Only

Check input signal

-RF

-External Input

signal

Error

symptom

C. Audio error

Wrecked audio/ discontinuation/noise

Established

date

Revised date

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

☞A21+A18

Check audio B+ Voltage (13.2V)

Normal

voltage?

N

Replace Power B/D

Replace Main B/D

N

Y

Signal

normal?

N

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

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

Check and replace speaker and connector

Replace Main B/D

Connect and check other external device

Normal

audio?

9/15

End

Check and fix external device

9

Standard Repair Process

LGE Internal Use Only

Error

symptom

Remote control & Local switch checking

D. Function error

1. Remote control(R/C) operating error

☞A22

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.

operating?

Normal

Y

N

Check & Replace

Baterry of R/C

Normal

operating?

Replace R/C

Check & Repair Cable connection Connector solder

Y

Close

N

Normal

operating?

Y

Close

☞A22

N

Check B+3.5V

On Main B/D

Established

date

Revised date

☞A22

N

Y

Check IR

Output signal

Normal

Voltage?

☞A18

Check 13.2V on Power B/D

Replace Power B/D or

Replace Main B/D

(Power B/D don’t have problem)

10/15

Replace

Main B/D

Normal

Signal?

N

Repair/Replace

IR B/D

Y

10

Standard Repair Process

LGE Internal Use Only

Error

symptom

D. Function error

MR15RA operating checking

2. MR15RA(Magic Remocon) operating error

☞A4

Check the

INSTART menu

RF Receiver ver

is “00.00”?

☞A23

Check & Repair

Y

RF assy

connection

☞A4

RF Receiver ver

is “00.00”?

Check MR15RA

N

itself Operation

N

Close

Normal

operating?

Check & Replace

Battery of

MR15RA

Normal

operating?

N

Y

N

Y

Press the

wheel

Close

Established

date

Revised date

Is show ok

message?

Y

Close

Is show ok

message?

Y

Turn off/on the

N

set and press

the wheel

N

11/15

Press the Guide

key about 5sec

& Press wheel

Y

Down load the Firmware

INSTART MENU12.RF Remocon Test Select

Receiver Firmware download

 Press OK

Replace

MR15RA

Close

* If you conduct the loop at 3times, change the MR15RA.

11

Standard Repair Process

LGE Internal Use Only

Error

symptom

3.Wifi operating error

Check the

INSTART menu

☞A4

Wi-Fi Mac value

is “NG”?

☞A24

Check & Repair

Wifi cable

connection

☞A4

Wi-Fi Mac value

is “NG”?

Y

D. Function error

Wifi operating checking

☞A24

N

Check the Wifi wafer

N

Close

1pin

Established

Revised date

Normal

Voltage?

Y

Close

date

N

12/15

Replace

Main B/D

Change the Wifi

Y

assy

12

Standard Repair Process

LGE Internal Use Only

Check input signal

Error

symptom

Signal

input?

Y

N

Check and fix

external device/cable

D. Function error

External device recognition error

Check technical information

- Fix information

- S/W Version

Technical

information?

Fix in

accordance

with technical

information

Y

External Input and

N

Component

Recognition error

HDMI/

DVI, Optical

Recognition error

Established

date

Revised date

13/15

Replace Main B/D

13

Standard Repair Process

LGE Internal Use Only

Identify nose type

Error

symptom

Circuit

noise

Mechanical

noise

Circuit noise, mechanical noise

Check location of noise

E. 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.

Replace PSU

OR

Established

date

Revised date

※ 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)

14/15

14

Standard Repair Process

LGE Internal Use Only

Error

symptom

Zoom part with exterior damage

Module damage

Cabinet

damage

Remote

control

damage

F. Exterior defect

Exterior defect

Replace module

Replace cabinet

Replace remote control

Established

date

Revised date

15/15

Stand

dent

Replace stand

15

Contents of Standard Repair Process Detail Technical Manual

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

5 Tuner Checking Part A5

A. Video error _Vertical/Horizontal bar,

6

residual image, light spot

7

A. Video error_ Color error

8 Adjustment Test pattern - ADJ Key A8

9

10 Exchange Main Board (2) A-2/5

11 Exchange Power Board (PSU) A-3/5

Defected Type caused by T-Con/ Inverter/ Module

12 Exchange Module (1) A-4/5

Check LCD back light with naked eye A1

TUNER input signal strength checking method

Connection diagram A6

Check Link Cable (Vx1/EPI) reconnection condition

Exchange Main Board (1) A-1/5

A3

A7

13 Exchange Module (2) A-5/5

Continue to the next page

Contents of Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Continued from previous page

No. Error symptom Content Page Remarks

14

B. Power error_ No power

15 Check power input Voltage & ST-BY 3.5V A10

16

17

18

19

20

21 Wifi operation checking method A16

B. Power error_Off when on, off

while viewing

C. Audio error_ No audio/Normal video

D. Function error

Check front display LED A9

POWER OFF MODE checking method A11

Checking method in menu when there is no audio

Voltage and speaker checking method

when there is no audio

Remote control operation checking method

Motion Remote operation checking method

A12

A13

A14

A15

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Error

symptom

Content

<UJ75>

A. Video error_No video/Normal audio

Check LCD back light with naked eye

Established

date

Revised

date

A1

<43”49”55”>

<60”65”>

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

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 ler for adjustment.

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

2. Enter into White Balance of item 6.

2. Enter into White Balance of item 10.

3. After recording the R, G, B (GAIN, Cut) value of Color Temp

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.

(Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD.

A2

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Error

symptom

Content

A. Video error_Video error, video lag/stop

TUNER input signal strength checking method

Established

date

Revised

date

Advanced Channels  Channel Tuning Manual Tuning

A3

When the signal is strong,

use the attenuator (-10dB, -

15dB, -20dB etc.)

A3

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Error

symptom

Content

A. Video error_Video error, video lag/stop

Version checking method

Established

date

Revised

date

A4

1. Checking method for remote control for adjustment

Version

Press the IN-START with the remote control for adjustment

A4

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Error

symptom

Content

<43”49”55”> <60”65”>

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

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

LGE Internal Use Only

<UJ75>

Error

symptom

Content

Check Link Cable(VX1/EPI) reconnection condition

A. Video error_Color error

Established

date

Revised

date

A7

<43”49”55”>

<60”65”>

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

A7

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Error

symptom

Content

A. Video error_Color error

Adjustment Test pattern - ADJ Key

Established

date

Revised

date

A8

You can view 6 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!)

A8

Appendix : Exchange Main Board (1)

LGE Internal Use Only

Solder defect, CNT Broken

T-Con Defect, CNT Broken

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

A - 1/5

Appendix : Exchange Main Board (2)

LGE Internal Use Only

Abnormal Power Section

Solder defect, Short/Crack

Abnormal Power Section

Fuse Open, Abnormal power section

Solder defect, Short/Crack

Abnormal Display

GRADATION

Noise

A - 2/5

GRADATION

Appendix : Exchange Power Board (PSU)

LGE Internal Use Only

No Light

Dim Light

No picture/Sound Ok

A - 3/5

Appendix : Exchange the Module (1)

LGE Internal Use Only

Press damage Press damage

Crosstalk Crosstalk

Press damage

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

A - 4/5

Appendix : Exchange the Module (2)

LGE Internal Use Only

Vertical Block

Source TAB IC Defect

Horizontal Block

Gate TAB IC Defect

Vertical Line

Source TAB IC Defect

Horizontal Block

Gate TAB IC Defect

Vertical Block

Source TAB IC Defect

Horizontal line

Gate TAB IC Defect Gate TAB IC Defect

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

Horizontal Block

Gate TAB IC Defect

A - 5/5

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Error

symptom

Content

ST-BY condition: On or Off Power ON condition: Turn Off

B. Power error _No power

Check front Power Indicator

Established

date

Revised

date

A9

Standard Repair Process Detail Technical Manual

Backlight

Forward Voltage

Symbol

Values

Unit

Min

Typ

Max

65UJ75

V

F

135.8

140.6

150.7 V

dc

60UJ75

124.0

137.1

150.8

55UJ75

110.2

118.2

126.2

49UJ75

105.1

112.7

120.3

43UJ75

97.3

100.8

107.7

LGE Internal Use Only

Error

symptom

Content

B. Power error _No power

Check power input voltage and ST-BY 3.5V

Check the DC 13.2V.

Established

date

Revised

date

A10

Standard Repair Process Detail Technical Manual

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

A11

Entry method

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

2. Check the entry into adjustment item 3

A11

Standard Repair Process Detail Technical Manual

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

A12

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

A12

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Error

symptom

Content

<UJ75>

C. Audio error_No audio/Normal video

Voltage and speaker checking method when there is no audio

②

Established

date

Revised

date

①

A13

Checking order when there is no audio

1.Check the contact condition of or 13.2V connector of Main Board

2. Measure the 13.2V input voltage supplied from Power Board (If there is no input voltage, remove and check the connector)

3.Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch

the GND and output terminal, the speaker is normal.

A13

1 SPK_R-FT

③

2 SPK_R+FT

3 SPK_L-FT

4 SPK_L+FT

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Error

symptom

Content

Remote control operation checking method

D. Function error

Established

date

Revised

date

A14

<UJ75>

① IR & EYE Sensor

IR

LED

Eye

②

Checking order to check remote control

Checking order

1.Check IR cable condition between IR & Main board.( Check picture number① and ②)

2.Check the standby 3.5V on the terminal 16 pin (③)

3.AS checking the Pre-Amp(IR LED light) , the power is in ON condition, an Analog Tester needle should move slowly, otherwise, it’s defective.

③

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18

19

20 21 22 VCC 23 KEY2 24 KEY1 25 GND

Pin name

VCC

USB_DM

USB_DP

GND

WOL/WIFI_ON

VCC

COMBO_RESET

GND

BT_WAKEUP_DEVICE

BT_WAKEUP_HOST

GND GND

EYE_SDA EYE_SCL

GND

IR

LED_R

GND

A14

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Error

symptom

Content

Remote control operation checking method

D. Function error

Established

date

Revised

date

A15

<UJ75>

① Wifi & BT Front

Wifi & BT Rear

Checking order to check motion remote/wifi

Checking order

②

③

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16 17 18

19

20 21 22 VCC 23 KEY2 24 KEY1 25 GND

Pin name

VCC

USB_DM

USB_DP

GND

WOL/WIFI_ON

VCC

COMBO_RESET

GND

BT_WAKEUP_DEVICE

BT_WAKEUP_HOST

GND GND

EYE_SDA EYE_SCL

GND

IR

LED_R

GND

1.Check BT/Wifi cable condition between BT/Wifi assy & Main board.

2.Check the 3.5V on the terminal 22

A15

LG 49UJ740V Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual