LG 32LJ510B Schematic

CONFIDENTIAL

LED TV

SERVICE MANUAL

CHASSIS : LD76H

MODEL : 32LJ51** 32LJ51**-ZA/ZC

CAUTION

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

P/NO : MFL69739903 (1704-REV00)

CONTENTS

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

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

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

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

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

EXPLODED VIEW .................................................................................. 12

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

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

- 2 -

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

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

General Guidance

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

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

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

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

Keep wires away from high voltage or high temperature parts.

Before returning the receiver to the customer,

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

Leakage Current Cold Check(Antenna Cold Check)

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

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet.

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

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

Leakage Current Hot Check circuit

- 3 -

SERVICING PRECAUTIONS

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

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

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

General Servicing Precautions

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

a. Removing or reinstalling any component, circuit board

module or any other receiver assembly.

b. Disconnecting or reconnecting any receiver electrical plug

or other electrical connection.

c. Connecting a test substitute in parallel with an electrolytic

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

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

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

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

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

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

of contacts in not required.

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

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

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

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

service manual.

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

heat sink in this receiver.

Electrostatically Sensitive (ES) Devices

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

devices are integrated circuits and some eld-effect transistors

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

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

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

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

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

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

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

electrical charges sufcient to damage ES devices.

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

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

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

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

General Soldering Guidelines

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

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

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

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

5. Use the following unsoldering technique

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

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

type solder removal device or with solder braid.

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

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

(500 °F to 600 °F)

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

against the component lead until the solder melts.

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

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

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

splashed solder with a small wire-bristle brush.

- 4 -

IC Remove/Replacement

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

Removal

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

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

Replacement

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

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

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

"Small-Signal" Discrete Transistor Removal/Replacement

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

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

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

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

Power Output, Transistor Device Removal/Replacement

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

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

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

4. Insert new transistor in the circuit board.

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

6. Replace heat sink.

Diode Removal/Replacement

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

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

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

4. Securely crimp each connection and solder it.

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

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

Circuit Board Foil Repair

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

At IC Connections

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

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

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

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

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

At Other Connections

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

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

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

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

Fuse and Conventional Resistor Removal/Replacement

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

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

- 5 -

SPECIFICATION

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

.

1. Application range

This specification is applied to the LED TV used LD76H chassis.

3. Test method

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

- Safety : CE, IEC specification

- EMC : CE, IEC specification

2. Requirement for Test

Each part is tested as below without special notice. (1) Temperature : 25°C ± 5°C (77°C ± 9°C), CST : 40°C ± 5°C (2) Relative Humidity : 65 % ± 10 % (3) Power Voltage : Standard input voltage (AC100~240V@ 50/60Hz) Standard Voltage of each product is marked by models (4) Specification and performance of each parts are followed

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

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

the adjustment

4. Model General Specification

No. Item Specication Remarks

DTV & Analog (Total 40 countries)

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

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

1 Market

(PAL Market-40 Countries)

EU/CIS

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

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

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

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

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

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

Supported satellite : 22 satellites

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

- 6 -

No. Item Specication Remarks

(1) Analogue TV

- Terrestrial/Cable

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

(2) Digital TV

- Satellite DTV

1) DVB-S/S2*

46 ~ 890 Mhz (Maximum number of storable programmes : 2000)

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

Broadcasting system

2

(Programme coverage,Band)

3 Receiving system

- Terrestrial

1) DVB-T/T2*

- Cable

1) DVB-C

Analog : Upper Heterodyne Digital : COFDM, QAM

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

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

46 ~ 890 Mhz (Maximum number of storable programmes : 2000)

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

External antenna impedance : 75 Ω

► DVB-T

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

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

► DVB-T2

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

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

► DVB-C

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

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

► DVB-S

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

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

4 Optical (1EA) SPDIF Only EU

Component & AV

5

Common port (1EA)

6 HDMI Input (2EA) HDMI1/2-DTV Support HDCP

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

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

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

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

- 7 -

No. Item Specication Remarks

CI : UK, Finland, Denmark, Norway, Sweden, Russia,

DVB-T

9 DVB

DVB-C

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

10 Ethernet (1EA) Wired, DMP only Only UK T2 Model for MHEG

Spain, Ireland, Luxemburg, Belgium, Netherland CI+ : France(Canal+), Italy(DGTVi)

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

5. External Input Support format

5.1. Video resolutions (2D)

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

No.

1 720*576 15.625 50.00 13.50 SDTV ,DVD 576I

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

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

4 720*576 31.25 50.00 27.00 SDTV 576P

5 720*480 31.50 60.00 27.027 SDTV 480P

6 720*480 31.47 59.94 27.00 SDTV 480P

7 1280*720 37.50 50.00 74.25 HDTV 720P

8 1280*720 45.00 60.00 74.25 HDTV 720P

9 1280*720 44.96 59.94 74.176 HDTV 720P

10 1920*1080 28.125 50.00 74.25 HDTV 1080I

11 1920*1080 33.75 60.00 74.25 HDTV 1080I

12 1920*1080 33.72 59.94 74.176 HDTV 1080I

13 1920*1080 56.25 50.00 148.50 HDTV 1080P

14 1920*1080 67.50 60.00 148.50 HDTV 1080P

15 1920*1080 67.432 59.94 148.352 HDTV 1080P

16 1920*1080 27.00 24.00 74.25 HDTV 1080P

17 1920*1080 26.97 23.94 74.176 HDTV 1080P

18 1920*1080 33.75 30.00 74.25 HDTV 1080P

19 1920*1080 33.71 29.97 74.176 HDTV 1080P

Resolution H-freq (kHz) V-freq (Hz) Pixel clock (MHz) Proposed

Specication

- 8 -

(2) HDMI Input (PC/DTV)

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

PC (DVI) DDC

1 640*350 31.46 70.09 25.17 EGA X

2 720*400 31.46 70.08 28.32 DOS O

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

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

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

6 1152*864 54.34 60.05 80.00 VESA O

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

8 1280*1024 63.98 60.02 108.0 VESA (SXGA) O FHD only

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

DTV

1 640*480 31.46 59.94 25.125 SDTV 480P

2 640*480 31.50 60.00 25.125 SDTV 480P

3 720*480 31.47 59.94 27.00 SDTV 480P

4 720*480 31.50 60.00 27.027 SDTV 480P

5 720*576 31.25 50.00 27.00 SDTV 576P(DVB)

6 1280*720 37.50 50.00 74.25 HDTV 720P(DVB)

7 1280*720 45.00 60.00 74.25 HDTV 720P

8 1280*720 44.96 59.94 74.176 HDTV 720P

9 1920*1080 28.12 50.00 74.25 HDTV 1080I(DVB)

10 1920*1080 33.75 60.00 74.25 HDTV 1080I

11 1920*1080 33.72 59.94 74.176 HDTV 1080I

12 1920*1080 56.25 50.00 148.50 HDTV 1080P(DVB)

13 1920*1080 67.50 60.00 148.50 HDTV 1080P

14 1920*1080 67.43 59.94 148.35 HDTV 1080P

15 1920*1080 27.00 24.00 74.25 HDTV 1080P

16 1920*1080 26.97 23.97 74.175 HDTV 1080P

17 1920*1080 33.75 30.00 74.25 HDTV 1080P

18 1920*1080 33.71 29.97 74.175 HDTV 1080P

(3) DTV Input

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

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

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

(4) USB Input

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

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

- 9 -

IC101

Main SOC

(P1801)

30P HD LVDS wafer

51P FHD LVDS wafer

(P1800)

COMP2_Y+/Pb+/Pr+/L_R_IN or AV_CVBS_IN/L_R_IN

CK+/-, D0+/-, D1+/-, D2+/-_HDMI2

DDC_SCL/SDA_2, HDMI_CEC

Serial Flash

(IC1300)

SPI_SCK/SDI/SDO/CS

System EEPROM

(IC104)

I2C_SCL/SDA

RXA0+/-~RXA4+/-, RXACK+/-

RXB0+/-~RXB4+/-, RXBCK+/-

AGP

SPK_R

SPK_L

AMP_SCL/SDA

AUD_LRCH,

AUD_LRCK, AUD_SCK

Audio AMP

(IC5600)

Connector

(P5601)

HDMI1

(JK800)

USB

(JK700)

DM/DP

USB1_OCP/CTL

DC-DC, OCP

(IC400)

+5V_USB

NAND FLASH

(IC102)

PCM_A[0:7]

Buffer

IC1902

TS_DATA[0:7]

PCM_DATA[0:7]

EPHY_TP/TN/RP/RN

LAN

(JK2100)

Only UK

COMPONENT

(JK2601)

PCM_A[8:14]

X-tal

TU_SCL / SDA

Tuner

(TU3703)

IF_N, IF_P, IP_S, IM_S, QM_S, QP_S

IF_AGC_S, IF_AGC

LNB_OUT

CI SLOT

(P1900)

REAR

SIDE

TU_CVBS, SIF

DEMOD_SCL/SDA

LNB

(IC2701)

LNB_OUT

HDMI2

(JK801)

SPDIF

Jack

SPDIF

(JK1001)

Only EU

SPDIF_OUT

One KEY, LED_R, IR, I2C_Sensor

CK+/-, D0+/-, D1+/-, D2+/-_HDMI4

DDC_SCL/SDA_4, HDMI_CEC

BLOCK DIAGRAM

1.EU/CIS : T2/C/S2 : LJ51_V/U: LD76H

- 10 -

IC101

Main SOC

(P1801)

30P HD LVDS wafer

51P FHD LVDS wafer

(P1800)

COMP2_Y+/Pb+/Pr+/L_R_IN or AV_CVBS_IN/L_R_IN

CK+/-, D0+/-, D1+/-, D2+/-_HDMI2

DDC_SCL/SDA_2, HDMI_CEC

SPI_SCK/SDI/SDO/CS

I2C_SCL/SDA

RXA0+/-~RXA4+/-, RXACK+/-

RXB0+/-~RXB4+/-, RXBCK+/-

AGP

SPK_R

SPK_L

AMP_SCL/SDA

HDMI1

(JK800)

USB

(JK700)

DM/DP

USB1_OCP/CTL +5V_USB

PCM_A[0:7]

TS_DATA[0:7]

PCM_DATA[0:7]

COMPONENT

(JK2601)

PCM_A[8:14]

CI SLOT

(P1900)

REAR

SIDE

HDMI2

(JK801)

SPDIF

Jack

SPDIF_OUT

TU_SCL / SDA

Tuner

(TU3702)

H/NIM

IF_N, IF_P

IF_AGC

TU_CVBS, SIF

Buffer

IC1902

DC-DC, OCP

(IC400)

Audio AMP

(IC5600)

Connector

(P5601)

AUD_LRCH,

AUD_LRCK, AUD_SCK

One KEY, LED_R, IR, I2C_Sensor

Serial Flash

(IC1300)

System EEPROM

(IC104)

X-tal

NAND FLASH

(IC102)

CK+/-, D0+/-, D1+/-, D2+/-_HDMI4

DDC_SCL/SDA_4, HDMI_CEC

SPDIF

(JK1001)

Only EU

2. EU : T/C : LJ51_0/B : LD76H

- 11 -

A10

700

200

LV1

521

800

500

810

120

900

400

540

720

200A

AR1

ARC1

200T

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.

- 12 -

DISASSEMBLY GUIDE

1. Unlock “1”(1ea), ”2”(3ea) , ”3”(2ea) Screw to separate Back cover Rear

Top using screw driver.

2

1

2

2. Unlock Pull the upward with using snap (Push “A”).

3 3

- 13 -

3. Separate Connectors “3” from Main and Module & SPK

3

4. Unlock “4”(10ea) Screw to separate “5”(Main PCB) using screw driver

5

4

- 14 -

4

5. Separate “6” Speaker (2ea)

6 6

6. Unlock “7”(4ea) Screw to separate “8”(Vesa Supporter), “9”(Vesa &Stand

Supporter) using driver

7

8

9

7

8

9

7

- 15 -

7. Completed

- 16 -

TROUBLE SHOOTING GUIDE

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

1

A. Video error

No video/Normal audio 1

2 No video/No audio 2

3 Tuning fail, Picture broken/ Freezing 3, 4

4 Color error 5

5

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

6

B. Power error

No power 7

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

C. Audio error

No audio/Normal video 9

9 Wrecked audio/discontinuation/noise 10

10

D. Function error

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

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

Contents of Standard Repair Process

Y

N

Move to

No video/No audio

No video

Normal audio

Check Back Light

On with naked eye

Check LVDS 12 V

of Main B/D

Replace T-con B/D

or Module

Replace Main

B/D or Repair parts

Check Main B/D to LED Back light Voltage

Replace Module

Replace Main

B/D or Repair parts

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

Replace Main Board Re-enter White Balance value

※Precaution

☞A4 ☞A1

☞A2

☞A3 & A6

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

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

Normal

Audio

On

Y

N

Normal

Voltage

Normal

Voltage

Y

N

Error Symptom

A. Video Error

Established date

1/14

Content

No video / Normal audio

Revised date

Standard Repair Process

N

Check voltage 19V

of Adaptor

No video /

No audio

Replace Main

B/D or Repair parts

Replace Adaptor

Normal Voltage

Error Symptom

A. Video Error

Established date

2/14

Content

No video / No audio

Revised date

Standard Repair Process

☞A13

N

Y

☞ A5

Check RF Signal level

Check RF Cable

Connection

1. Reconnection

2. Install Booster

Check

S/W Version

S/W Upgrade

Check whether other equipments have problem or not.

(By connecting RF Cable at other equipment)

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

Replace

Main B/D

Check

Tuner soldering

Y

. By using Digital signal level meter

. By using Diagnostics Setting on OSD

( Setting → Customer Support(red button on remote control) → Signal Test )

- Signal strength (Normal : over 50%)

- Signal quality (Normal : over 50%)

Y

Contact with signal distributor or broadcaster (Cable or Air)

N

☞ A6

End

Normal

Signal

Normal

Picture

Normal

Picture

Normal

Picture

SVC

Bulletin

End

Normal

Picture

Error Symptom

A. Video Error

Established date

3/14

Content

Tuning fail, Picture broken/freezing

Revised date

Standard Repair Process

Y

N

Y

N

Y

☞ A5

Check RF Signal level

Check

S/W Version

S/W Upgrade

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

Y

Replace satellite setting

(match with installed ANT)

N

Y

☞ A6

Check satellite setting.

- Check LNB frequency

- Check satellite

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

Contact with signal

distributor

or broadcaster

(Cable or Air)

N

Check

Tuner soldering

Replace

Main B/D

Normal

Picture

Normal

Picture

Normal

Setting

SVC

Bulletin

Normal

Signal

End

Error Symptom

A. Video Error

Established date

4/14

Content

Tuning fail, Picture broken/freezing

Revised date

Standard Repair Process

Y

N

Y

N

Color

error

Check and replace Link

Cable

(LVDS) and contact condition

Replace Main B/D

Check error

color input

mode

Check color by input

- External Input (COMPONENT/AV/HDMI)

Check external

device and

cable

Replace Main B/D

☞A7

N

Replace module

Request repair

for external

device/cable

Check Test pattern

☞A10

☞ A8 / A9

End

Color

error

Color

error

External

device/

Cable

Normal

Error Symptom

A. Video Error

Established date

5/14

Content

Color error

Revised date

Standard Repair Process

N

Y

External

Component,

Input

HDMI

error

N

Y

N

Y

Check external

device

connection

condition

Check and

replace Link

Cable

Replace

Module

Check color condition by input

- External Input (Component/AV/HDMI)

Vertical/Horizontal bar, residual image, light spot

Request repair

for external

device

☞A10

External device screen error-Color error

Connect other external

device and cable

(Check normal operation of

External Input, Component

and HDMI by connecting

Jig, pattern Generator,

Set-top Box etc.

N

Replace

Main B/D

Check screen condition by input

-External Input (Component/AV/ HDMI)

Request repair for

external device

Check S/W Version

Y

S/W Upgrade

Replace Main B/D

Replace

Module

☞A7

☞ A8/ A9

Check Test pattern

End

Screen

normal

Screen

normal

Screen

normal

Screen normal

Screen

normal

End

Check

Version

Normal Screen

External

Input error

Error Symptom

A. Video Error

Established date

6/14

Content

Vertical/Horizontal bar, Residual Image,

Light spot, External device Color error

Revised date

Standard Repair Process

Y

End

N

Y

N

Y

N

Y

N

Y

Power

LED On

DC Power on

by pressing Power Key

On Remote control

Check Adaptor/

Power cord

was inserted properly

Check

Power LED

Replace

Main B/D

Check ST-BY 3.5V

N

Replace Adaptor or

Replace Main B/D

☞A11

☞A16

Stand-By : Red

Power

LED On

Normal

Voltage

Normal

Operati

on

Error Symptom

B. Power Error

Established date

7/14

Content

No power

Revised date

Standard Repair Process

End

Y

N

Y

N

Y

N

Normal

Voltage

Check Power Off

Mode

Fix A/C cord & Outlet

Replace Main B/D

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

Replace Main B/D

Replace Adaptor

☞A14

☞A13

Status Power off List Explanation

Normal

"POWEROFF_REMOTEKEY" Power off by REMOTE CONTROL "POWEROFF_OFFTIMER" Power off by OFF TIMER "POWEROFF_SLEEPTIMER" Power off by SLEEP TIMER "POWEROFF_INSTOP" Power off by INSTOP KEY "POWEROFF_AUTOOFF" Power off by AUTO OFF "POWEROFF_ONTIMER" Power off by ON TIMER "POWEROFF_RS232C" Power off by RS232C "POWEROFF_RESREC" Power off by Reservated Record "POWEROFF_RECEND" Power off by End of Recording "POWEROFF_SWDOWN" Power off by S/W Download "POWEROFF_UNKNOWN" Power off by unknown status except listed case

Abnormal

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

* Please refer to the all cases which

can be displayed on power off mode.

Adaptor

DC Out

CPU

Abnorm

al

Abnorm

al1

Normal End

Error Symptom

B. Power Error

Established date

8/14

Content

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

Revised date

Standard Repair Process

Replace Adaptor

Error

Check outlet

or A/C cord

N

Y

N

Y

N

Y

N

No audio

Screen normal

Check user

Connection

from Main 

Speaker Cable

Insert wafer SPK Cable

Replace Speaker

or Main B/D

Connec

tion

Error Symptom

C. Audio Error

Established date

9/14

Content

No audio / Normal video

Revised date

Standard Repair Process

☞A15

Normal

Audio

End

N

Y

N

Y

Check and replace

speaker and

connector

Connect and check

other external

device

Check and fix external device

Replace Adaptor

N

Check input signal

-RF

-External Input

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

cable/ANT provider

Check Voltage 19V

of Adaptor

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

Replace Main B/D

☞A13

End

Signal

Normal

Normal Voltage

Normal

Audio

Wrecked Audio/

Discontinuation/

Noise for all audio

Wrecked Audio/ Discontinuation/

Noise only for D-TV

Wrecked Audio/ Discontinuation/

Noise only for Analog

Wrecked Audio/

Discontinuation/

Noise only for External Input

N

Replace Main B/D

Error Symptom

C. Audio Error

Established date

10/14

Content

Wrecked audio / Discontinuation / Noise

Revised date

Standard Repair Process

N

Y

Check R/C itself

Operation

Y

Replace R/C

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

from light in room.

Check R/C Operating

When turn off light

in room

Check & Replace

Baterry of R/C

Check & Repair

Cable connection

Connector solder

Check 3.5V

On Main B/D

☞A16

N

Check Voltage 19V of Adaptor

☞A13

Check IR

Output signal

N

Y

Replace

IR B/D

N

☞A16

Replace

Main B/D

Y

☞A16

End

Normal

Operating

Normal Voltage

Normal

Signal

Normal

Operating

Normal

Operating

End

Error Symptom

D. Function Error

Established date

11/14

Content

Remote control & Local switch checking

Revised date

Standard Repair Process

N

Y

N

Y

Check technical information

- Fix information

- S/W Version

Y

Check input

signal

Check and fix

external device/cable

Replace Main B/D

Fix in

accordance

with technical

information

Signal

Input

Technical

information

External Input and

Component

Recognition error

HDMI

Recognition error

Error Symptom

D. Function Error

Established date

12/14

Content

External device recognition error

Revised date

Standard Repair Process

Y

N

Check location

of noise

Identify

nose type

Replace Main Board

Check location

of noise

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

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

※ Mechanical noise is a natural phenomenon and apply the 1st level description. When the customer does not agree, apply the process by stage.

※ Describe the basis of the description in

“Part related to nose” in the Owner’s Manual.

Circuit

noise

Mechanical

noise

Error Symptom

E. Noise

Established date

13/14

Content

Circuit noise, Mechanical noise

Revised date

Standard Repair Process

or

Replace module

Zoom part with exterior damage

Replace cabinet

Replace remote control

Replace stand

Standard Repair Process

Module

damage

Cabinet

damage

Remote

Control

damage

Stand

damage

Error Symptom

F. Exterior Defect

Established date

14/14

Content

Exterior defect

Revised date

Contents of Standard Repair Process Detail Technical Manual

No. Error symptom Content Page Remarks

1

A. Video error_ No video/Normal audio

Check LCD back light with naked eye A1 2 LED driver B+ measuring method A2 3 Check White Balance value A3 4 Power voltage measuring method A4 5

A. Video error_ No video/Video lag/stop

TUNER input signal strength checking method A5 6 Version checking method A6

7

A. Video error_Color error

Connection diagram A7

8

Check Link Cable (LVDS) reconnection condition

A8 A9

9

Adjustment Test pattern - ADJ Key A10

10 11

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

Connection diagram A8

12 Check Link Cable (LVDS) reconnection condition

A8

A9 13 Adjustment Test pattern - ADJ Key A10 14

Defected Type caused by T-Con/ Inverter/ Module

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

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

16

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

Exchange Module itself (1) A-4/5

17 18 Exchange Module itself (2) A-5/5

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

No. Error symptom Content Page Remarks

19

B. Power error_No power

Check front display LED A11 20 Check power input Voltage & ST-BY 3.5V A12 21 Checking method when power is ON A13 22 Power voltage measuring method A4

23

B. Power error_Off when on, off while viewing

POWER OFF MODE checking method A14

24 C. Audio error_No audio/Normal video

Checking method in Setting when there is no

audio

A15

25

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

Remote control operation checking method A16

Contents of Standard Repair Process Detail Technical Manual

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

Standard Repair Process Detail Technical Manual

Power On -> disjoint back case -> check lighting

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A1

Content

Check Back Light On with Naked eye

Revised date

Standard Repair Process Detail Technical Manual

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

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A2

Content

Main Board to LED back light Voltage

Revised date

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

2. Enter into White Balance of item 11

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

Standard Repair Process Detail Technical Manual

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A3

Content

Check White Balance value

Revised date

Standard Repair Process Detail Technical Manual

Check LVDS Voltage 12V

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A4

Content

Power Voltage Measuring Method

Revised date

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

Setting  Programmes  signal test  Select channel

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

Standard Repair Process Detail Technical Manual

Error Symptom

A. Video Error, Video lag/stop

Established date

A5

Content

Tuner Input Signal Strength Checking Method

Revised date

Standard Repair Process Detail Technical Manual

Checking SW version method for remote control for adjustment

Press the IN-START with the remote control for adjustment

Error Symptom

A. Video Error, No Video/Normal Audio

Established date

A6

Content

Version Checking Method

Revised date

Standard Repair Process Detail Technical Manual

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

* Jack spec. : depending on Model

Error Symptom

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

Light spot

Established date

A7

Content

Connection diagram

Revised date

1. Check and replace LVDS Cable

2. Check LVDS connection condition

Standard Repair Process Detail Technical Manual

Error Symptom

A. Video Error, Color Error

Established date

A8/

A9

Content

Check and replace Link Cable(LVDS) and contact condition

Revised date

Standard Repair Process Detail Technical Manual

You can view 10 types of patterns using the ADJ Key

Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..)

4.Video error (Classification of MODULE or Main-B/D)

Error Symptom

A. Video Error, Color Error

Established date

A10

Content

Adjustment Test Pattern – ADJ Key

Revised date

Solder defect, CNT Broken

T-Con Defect, CNT Broken

Solder defect, CNT Broken

Abnormal Power Section

Solder defect, Short/Crack

Abnormal Power Section Solder defect, Short/Crack

Appendix : Exchange T-Con Board (1)

Abnormal Power Section

Solder defect, Short/Crack

Abnormal Power Section

Solder defect, Short/Crack

Fuse Open, Abnormal power section

Noise

GRADATION

Abnormal Display

Appendix : Exchange T-Con Board (2)

Appendix : Exchange the Module (1)

Crosstalk Crosstalk

Press damage Press damage

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

Press damage

Vertical Block

Source TAB IC Defect

Horizontal Block Gate TAB IC Defect

Gate TAB IC Defect

Vertical Line Source TAB IC Defect

Vertical Block

Source TAB IC Defect

Horizontal Block Gate TAB IC Defect

Horizontal line Gate TAB IC Defect

Gate TAB IC Defect

Horizontal Block Gate TAB IC Defect

Appendix : Exchange the Module (2)

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

Standard Repair Process Detail Technical Manual

ST-BY condition: Red

Front LED control :

Setting  Option  Standby Light  On/Off

Error Symptom

B. Power Error, No Power

Established date

A11

Content

Check front Display LED

Revised date

Standard Repair Process Detail Technical Manual

Error Symptom

B. Power Error, No Power

Established date

A12/

A13

Content

Checking Method When Power is ON

Revised date

Check Voltage 19V of Adaptor Power

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

2. Check the entry into adjustment item 3

Standard Repair Process Detail Technical Manual

Error Symptom

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

Established date

A14

Content

Power off Mode checking method

Revised date

Check Connection from Main B/D to Speaker

Standard Repair Process Detail Technical Manual

Error Symptom

C. Audio Error, No Audio/Normal Video

Established date

A15

Content

Checking method in Setting when there is no audio

Revised date

1

GND

2

N/A

3

KEY2

4

+3.5V_ST

5

GND

6

LED_R/BUZZ

7

IR

8

GND

9

I2C_SCL_SENSOR

10

I2C_SDA_SENSOR

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

3. Check the ST-BY 3.5V on the terminal 4

4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog Tester needle moves slowly, and defective when it does not move at all.

Standard Repair Process Detail Technical Manual

①

②

③

④

P4600

< Sub Ass’y>

< Main Ass’y>

Error Symptom

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

Established date

A16

Content

Remote control operation checking method

Revised date

LG 32LJ510B Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual