Internal Use Only

website:http://biz.LGservice.com
TELEVISOR A LCD MANUAL DE SERVICIO

CHASIS : LP81A

MODELO : 32LG30R

ATENCIN

32LG30R-MA
Antes de dar servicio al chasis, lea las PRECAUCIONES DE SEGURIDAD en este manual.

CONTENTS

CONTENTS.... 2 SAFETY PRECAUTIONS...3 SPECIFICATION...6 ADJUSTMENT INSTRUCTION...9 TROUBLE SHOOTING...14 BLOCK DIAGRAM...19 EXPLODED VIEW.... 20 EXPLODED VIEW PARTS LIST..21 REPLACEMENT PARTS LIST... 22 SVC. SHEET....
Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

LGE Internal Use Only

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Replacement Parts List. 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 1W), keep the resistor 10mm away from PCB. Keep wires away from high voltage or high temperature parts.
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 1.5K/10watt resistor in parallel with a 0.15uF 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 0.5mA. 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

AC Volt-meter

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 1M and 5.2M. 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.
To Instrument's exposed METALLIC PARTS
Good Earth Ground such as WATER PIPE, CONDUIT etc.

0.15uF

1.5 Kohm/10W

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 conflict 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 specified 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 flammable mixture. Unless specified 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 fixtures specified in this service manual. CAUTION: Do not connect the test fixture 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 field-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

IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat 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. 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. 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.

SPECIFICATION

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

1. Application range

This specification is applied to LP81A chassis.

3. Test method

(1) Performance : LGE TV test method followed (2) Demanded other specification Safety : CE, IEC Specification EMC : CE, IEC

2. Requirement for Test

Each part is tested as below without special appointment. (1) Temperature : 25 5C(77 9F), CST : 40 5C (2) Humidity : 65% 10% (3) Power : Standard input voltage (100-240V~, 50/60Hz) * 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.
4. General Specification(LCD Module)
Item Display Screen Device Specification 26 wide Color Display Module 32 wide Color Display Module Aspect Ratio LCD Module 16:TFT WXGA LCD 32 TFT WXGA LCD Operating Environment 1) Temp. : 0 ~ 40 deg 2) Humidity : 0 ~ 85% Storage Environment 1) Temp. : -20 ~ 60 deg 2) Humidity : 0 ~ 85 % Input Voltage Power Consumption 100-240V~, 50/60Hz Power on (Blue) : LG30/LG50 Power on (White) : LG60 TBD TBD 26 HD 32 HD LG60:St-by Light condition Inch Outline Dimension Pixel Pitch Back Light Outline Dimension Pixel Pitch Back Light LPL(HD) Outline Dimension Pixel Pitch Back Light Display Colors Coating 32 (H) x (V) x (D) 626 x 373 x 43.7 0.1405 x 0.CCFL 760 x 450 x 47.4 0.17025 x 0.CCFL 760 x 450 x 48 0.17025 x 0.EEFL 3H, AG/ 2H, AG LPL, CMO, AUO / Sharp unit mm mm mm mm mm mm mm mm mm [with inverter] [with inverter] Remark [with inverter] Volume: 1/8 volume of sound distortion point 26 HD MAKER :CMO 32 HD MAKER :LPL CPT, CMO, AUO, SHARP LGE SPEC Measurement Result Remark Resolution:1366X768(HD) Resolution:1366X768(HD)
St-By (Red) 1.0 W (All) LCD Module (Maker : AUO, CMO, CPT, LPL, SHARP) Maker CMO(HD)
5. Model Specification(NON EU)
Item Market Broadcasting system Available Channel Specification Central and South America PAL BAND VHF UHF CATV Receiving system Video Input (2EA) AV Output (1EA) S-Video Input (1EA) Component Input (2EA) RGB Input (1EA) HDMI Input 2EA 3EA Audio Input (5EA) RS-232C USB Input PC Audio, Component (2EA), AV (2EA) Remote control, Commercial Divx, MP3, JPEG NTSC 2~13 14~69 1~125 Remark
Upper Heterodyne NTSC, PAL-M/N NTSC, PAL-M/N NTSC, PAL-M/N Y/Cb/Cr, Y/ Pb/Pr RGB-PC, S/W Upgrade HDMI-DTV, Only PCM MODE Rear 1EA, Side 1EA Rear Side (S-Video Priority) Rear Rear LG30 Tool, 32LG60 LG50, LG70 Tool L/R Input Side(1EA)-LG30 Tool only (LG50, LG60, LG70 not Support) Side(1EA) - LG60, LG70 Tool Only (LG30, LG50 Not Support)

ADJUSTMENT INSTRUCTION

1. Application Range
This spec. sheet is applied all of the 32/37/42/47/52 LCD TV, LP81A chassis (HURRICANE 5) by manufacturing LG TV Plant all over the world. (2) Click the connect button and confirm Dialog Box.

2. Specification

1) Because this is not a hot chassis, it is not necessary to use an isolation transformer. However, the use of isolation transformer will help protect test instrument. 2) Adjustment must be done in the correct order. 3) The adjustment must be performed in the circumstance of 255C of temperature and 6510% of relative humidity if there is no specific designation. 4) The input voltage of the receiver must keep 100-220V, 50/60Hz. 5) Before adjustment, execute Heat-Run for 15 minutes at RF no signal.
(3) Click the Config button and Change speed E2PROM Device setting : over the 350Khz

3. S/W program download

3-1. Preliminary steps
(1) Download method 1 (PCB Assy) - HD
(4) Read and write bin file Click (1)Read tab, and then load download file(XXXX.bin) by clicking Read.

f i l ex x x.bi n

(2) Connect the download jig to D-sub jack

3-2. Download steps

(1) Execute ISP Tool program in PC, then a main window will be opened
(5).Click Auto(2) tab and set as below (6).click Run(3). (7).After downloading, check OK(4) message.
(2) f i l ex x x.bi n (4).. OK

Double click

## USB DOWNLOAD 1) Put the USB Stick to the USB socket
(1) Confirmation - We confirm whether 0xF1 (offset), 0xF2 (gain) address of EEPROM 0xBC is 0xAA or not. - If 0xF1, 0xF2 address of EEPROM 0xBC isnt 0xAA, we adjust once more - We can confirm the ADC values from 0x00~0x05 addresses in a page 0xBC * Manual ADC process using Service Remocon. After enter Service Mode by pushing ADJ key, execute Auto-RGB by pushing _ key at Auto-RGB.

4-2. Component input ADC

(1) Component Gain/Offset Adjustment7 - Convert to Component in Input-source - Input the Component ( Which has 720p@60Hz YPbPr signal : 100% Color Bar (MSPG-925F Model: 217/ Pattern: 65 ) into Component.
2) Automatically detecting update file in USB Stick
- Adjust by commanding AUTO_COLOR_ADJUST (0xF1) 0x00 0x02 instruction 3) Select Start Button and press ok button Updating is staring. (2) Confirmation - We confirm whether 0xF3 (offset), 0xF4 (gain) address of EEPROM 0xBC is 0xAA or not. - If 0xF3, 0xF4 address of EEPROM 0xBC isnt 0xAA, we adjust once more. - We can confirm the ADC values from 0x06~0x0B adresses in a page 0xBC. * Manual ADC process using Service Remocon. After enter Service Mode by pushing ADJ key, execute Auto-RGB by pushing _ key at Auto-RGB.

4) Finishing the version updating, you have to put out USB stick and AC Power off. 5) After putting AC Power on and check updated version on your TV.
** TOOL Option, Area Option change and AC off Before PCBA check, you have to change the Tool option, Area option and have to AC off/on (Plug out and in) (If missing this process, set can operate abnormally)

4. ADC Process

* Required Equipments - Remote controller for adjustment - MSPG-925F Pattern Generator
5. TOOL Option, Area Option change
(1) Profile : Must be changed the option value because being different with some setting value depend on module maker, inch and market. (2) Equipment : adjustment remote control. (3) Adjustment method The input methods are same as other chassis.(Use INSTART Key on the Adjust Remocon.) (If not changed the option, the input menu can differ the model spec.) * Refer to Job Expression of each main chassis assy (EBTxxxxxxxx) for Option value * Never push the IN-STOP KEY after completing the function inspection.
4-1. Method of Auto RGB Color Balance
- Convert to RGB PC in Input-source - Input the PC 1024x768 @ 60Hz 1/2 Black & White Pattern(MSPG-925F model:60, pattern:54) into RGB. - Adjust by commanding AUTO_COLOR_ADJUST(0xF1) 0x00 0x02 instruction.

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6. EDID (The Extended Display Identification Data ) /DDC (Display Data Channel) download
* Caution Use the proper signal cable for EDID Download

6-1. EDID DOWNLOAD

* Caution: - Never connect HDMI & D-SUB Cable at the same time. - Use the proper cables below for EDID Writing For RGB EDID For HDMI EDID
- Detail EDID Options are below (A, B, C, D, E, F) A. Product ID B. Serial No: Controlled on production line C. Month, Year: Controlled on production line: ex) Monthly: Year: D. Model Name(Hex):
Model name Model Name(HEX) LG TV 00 FC 00 4C 0A 20
E Checksum: Changeable by total EDID data

6-2. HDCP SETTING

(High-Bandwidth Digital Contents Protection) - Connect D-sub Signal Cable to D-Sub Jack - Input HDCP key with HDCP-key- in-program - HDCP Key value is stored on EEPROM(AT24C64) which is From 0x80 addresses of 0xA0 page - AC off/ on and on HDCP button of MSPG925 and confirm whether picture is displayed or not of using MSPG925 - HDCP Key value is different among the sets., Condition GSM Digital : 1 Digital :03 Data 1E6D
* EDID Data Item Manufacturer ID Version Revision
7. Adjustment of White Balance
7-1. Purpose and Principle for adjustment of the color temperature
- Purpose : Adjust the color temperature to reduce the deviation of the module color temperature. - Principle : To adjust the white balance without the saturation, Fix the one of R/G/B gain to C0 and decrease the others.

* LP81A HD Model EDID <Analog : 128bytes>
7-2. Adjustment mode : Two modes of Cool and Warm
(Medium data is automatically calibrated by the Cool data) * Required Equipment - Remote controller for adjustment - Color Analyzer : CA100+ or CA-210 or same product (ch:9) - Auto W/B adjustment instrument(only for Auto adjustment)
<HDMI 1 : 256bytes> / <HDMI 2 : 256bytes> The data is same without Physical address
7-3. Connecting diagram of equipment for measuring (For Automatic Adjustment)
-> Physical address(F) : HDMI 1 -> 10, HDMI 2 -> 20

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(1) Enter the adjustment mode of DDC - Set command delay time : 50ms - Enter the DDC adjustment mode at the same time heatrun mode when pushing the power on by power only key - Maintain the DDC adjustment mode with same condition of Heat-run (Maintain after AC off/on in status of Heat-run pattern display) (2) Release the DDC adjustment mode - Release the adjust mode after AC off/on or std-by off/on in status of finishing the Hear-run mode - Release the Adjust mode when receiving the aging off command(F00) from adjustment equipment - Need to transmit the aging off command to TV set after finishing the adjustment. - Check DDC adjust mode release by exit key and release DDC adjust mode (3) Enter the adjust mode of white balance - Enter the white balance adjustment mode with aging command(F3, 00, FF) * Luminance min value is 200cd/m2 in the cool mode (For LCD)
(3) x > target , y < target 1) First decrease B, so make y a little more than the target. 2) Adjust x value by decreasing the R (4) x < target , y > target 1) First decrease B, so make x a little more than the target. 2) Adjust x value by decreasing the G
- Standard color coordinate and temperature when using the CA100+ or CA210 equipment
Mode Color coordinate X Cool Warm 0.2760.002 0.3130.002 Y 0.2830.002 0.3290.002 11,000K 0.000 6,500K 0.003 Temp uv

** DDC Command set **

Adjustment Aging On/Off Input select CMD(HEX) ADR F3 F00 VALUE FF/00 0x10 : TV 0x20 : AV1 detail FF : ON / OO : OFF
7-4. Adjustment of White Balance
(for Manual adjustment) (1) Adjustment mode : Two modes (Cool and Warm) (Medium data is automatically calibrated by the Cool data) (2) Color analyzer(CA100+, CA210) should be used in the calibrated ch by CS-1000(LCD : CH9, PDP : CH10) (3) Operate the zero-calibration of the CA100+ or CA-210, then stick sensor to the module when adjusting. (4) For manual adjustment, it is also possible by the following sequence. 1) Select white pattern of heat-run by pressing POWER ON key on remote control for adjustment then operate heat run longer than 15 minutes. (If not executed this step, the condition for W/B may be different.) 2) Push Exit key. 3) Change to the AV mode by remote control.(Push frontAV or Input key) 4) Input external pattern(85% white pattern) 5) Push the ADJ key two times (entering White Balance mode) 6) Stick the sensor to the center of the screen and select each items (Red/Green/Blue Gain and Offset) using D/E(CH +/-) key on R/C. 7) Adjust R/ G/ B Gain using F/G(VOL +/-) key on R/C. 8) Adjust two modes (Cool and Warm) (Fix the one of R/G/B and change the others) 9) When adjustment is completed, Exit adjustment mode using EXIT key on R/C. * CASE First adjust the coordinate far away from the target value(x, y). (1) x, y > target 1) Decrease the R, G. (2) x, y < target 1) First decrease the B gain, 2) Decrease the one of the others. - In case of decreasing the x, decreasing the R : fix G - In case of decreasing the y, decreasing the G : fix R

0x21 : AV2 0x40 : Component1 0x41 : Component2 0x60 : RGB 0x90 : HDMI1 0x91 : HDMI2 R GAIN G GAIN B GAIN R GAIN G GAIN B GAIN R GAIN G GAIN B GAIN CSM mode 1A 1A 1A F- C- C- C- C- C- C- C- C- CAUTO ADC F0, 1, 2 COOL NORMAL WARM 0: Offset adjustment 1: Gain adjustment 2: Offset and Gain adjustment EEPROM Read EEPROMWrite E7 Edata EEPROM read EEPROM write GAIN adjustment CSM WARM GAIN adjustment CSM NORMAL GAIN adjustment CSM COOL

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8. DDC command protocol

8-1. Signal TABLE

8-2. E2PROM Data Write

(1) Signal TABLE

Delay 20m
LEN : 84h+Bytes CMD : E8h ADH : E2PROM Slave Address (A0,A2,A4,A6), Not 00h (Reserved by BufferToEEPROM) ADL : E2PROM Sub Address(00~FF) Data : Write data Delay : 20ms (2) Command Set
Adjustment contents EEPROM WRITE CMD(hex) E8h LEN 94 (84+n)h Details 16-Byte Write n-byte Write
* Purpose 1) EDID write : 16-byte by 16-byte, 8 order (128-byte) write(TO 00 7F of EEPROM Page A4). 2) FOS Default write : 14-mode data write (SyncFlags, HPeriodH, HPeriodL, VtotalH, VtotalL, SrcHTotalH, SrcHTotalL, SrcHStartH, SrcHStartL, SrcVStartH, SrcVStartL, HsyncPhase). 3) Random Data write : write the appointment Address of E2PROM. (3) E2PROM Data Read 1) Signal TABLE

Delay 150ms

128 Bytes

2) COMMAND SET

Adjustment contents CMD(hex) ADH(hex) ADL(hex) EEPROM READ E7 A80 A80 A80 A80 Details 0-Page 0~7F Read 0-Page 80~FF Read 1-Page 0~7F Read 1-Page 80~FF Read 2-Page 0~7F Read 2-Page 80~FF Read 3-Page 0~7F Read 3-Page 80~FF Read
* Purpose : To read(84h) the appointment Address of E2PROM by 128(80h)-byte

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TROUBLESHOOTING

1. No power

(1) Symptom
1) It is not discharged minutely from module. 2) Light does not come into the front LED.

(2) Check process

Is the power cord plugged in?

Plug in the power cord.

Are the line filter and PSU connected?
Connect the cable.(SC100)
Is the fuse of PSU normal? (F101)

Replace the fuse.

Is it connected that PSU and P1100 in Main B/D?

Connect a cable P1100.

After all cables connect is removed to PSU, the AC voltage marking is authorized on manual. When ST-BY 5V is not operated. replace PSU.

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2. No Raster
1) No OSD and image occur at screen. 2) It maintains the condition where the front LED is green.
Does minute discharge at Module? No No Is output the normality Low/High voltage except Stand-by 5V?

Is the inverter / VaVs on?

Replace the Power board.

Yes Yes Check the LCD Module
Is the link cable normal?
Reconnect Panel line cable. (HD : P403, FHD : P402)
Is the IC801s output normal?

Replace the VSC.

3. Unusual display from RF mode
Is video output of the Tuner normal? (Check TU500_Pin13) Is the input voltage normal?(Check Pin3) No Yes Check the power.
Is the I2C communication normal? (Check Pin9, Pin10)

No Check the Tuner.

Block A
Is the LVDS Cable connected? well Yes No Cable inserts well.

Change the IC(IC801)

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4. Unusual display from rear AV mode.
Is video input of the A/V Jack normal? (Check R8044) No Check the input source.

Same as Block A.

5. Unusual display from Side AV model.
Is video input of the Side A/V Jack normal? (Check R8043) No Check the input source.
6. Unusual display from Side S-Video mode.
Is video input of the S-Video Jack normal? (Check R8041/42) No Check the input source.

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7. Unusual display from component 1 mode
Is video input of the Com1 Jack normal? (Check R8011/12/13)
No Check the input source.

Change IC801.

8. Unusual display from component 2 model
Is video input of the Com2 Jack normal? (Check R8030/32/33)
9. Unusual display from RGB model
Is video input of the Com2 Jack normal? (Check R8035/37/39)

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10. No Sound
1) LED is green 2) Screen display but sound is not output.
All input(mode) is no sound.
Is the speaker on it menu?

Set on speaker in menu.

Download the EDID data.
Is the speaker cable normal?

Check the Speaker cable.

Only AV/COM2/PC input is no sound.
Is the output of IC600 normal?

No Replace IC600

Yes Check the signal after IC600 refer to circuit diagram.
Is IC801 operated normality?

No Replace IC801

No Only RF is no sound. Check the Tuner In/Out.
Is IC601 operated normality?

No Replace IC601

Yes Replace Main B/D.

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RF (Tuner)
MAIN NVM x0.55 PART_I2C x4 LINE OUT LINE OUT CVBS IN Y/C IN x0.55 LINE_MUTE Mstar Romeo LGE6891CD AUDIO_SW LINE IN LVDS x0.55 S_VIDEO_DET LM324 X4 AMP SERIAL FLASH DDR MEM

TUNER_I2C CVBS IN

LINE IN

SIF IN CVBS IN

AV1 in

CVBS OUT

AV out

LINE_MUTE

SideAV in (AV2 in)

DISPLAY MODULE

Y/Pb/Pr IN
x0.55 ROM_I2C DSUB_DDC x0.55 LINE IN UART_Rx/Tx HDMI_SEL PART_I2C SW_RESET I2S OUT MC74HC4066 Audio SW

Comp1 in

Comp2 in

RGB in (D/L)

R/G/B/HS/VS IN

BLOCK DIAGRAM

- 19 TMDS(HDMI in) DDC/HPD/CEC [CEC not through HDMI MUX, direct JACK to MAIN IC] EDID NVM DDC EDID NVM MPEG RX/TX MPEG RESET I2S IN 656 IN

PC Audio in

EDID NVM

RS-232C

MX3232

TMDS(HDMI in)

EDID NVM TMDS(HDMI in)
DDC/HDP/CEC TMDS351PAG HDMI MUX
NTP3000A Digital Audio AMP

DDC/HPD/CEC

PART_I2C SW_RESET 656 IN x4 CVBS OUT TW9910 Sub Decoder

USB(AV I/O, Data I/O)

BD2041 Protect IC
Zoran VADDIS-966XD MPEG Decoder

DDR MEM SERIAL FLASH

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

904 901

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INPUT1 : COMP1/2,RS232C,PC

INPUT2 : CVBS,SIDE AV

RS-232C *ONLY LG30
RD103 R106 220K C115 1000pF READY R134 10K

JK101 PPJ209-02

COMPONENT2
[RD]O_SPRING 3E [RD]CONTACT 4E [RD]1P_CAN2 2E [WH]C_LUG_L 5D [WH]1P_CAN 2D [RD]C_LUG_L 5C [RD]1P_CAN1 2C [BL]C_LUG_L 5B [BL]1P_CAN 2B [GN]O_SPRING 3A [GN]CONTACT 4A [GN]1P_CAN 2A
D119 30V SD05 RD118 30V SD05 RD117 30V SD05 RD116 5.6V RR120 220K R140 10K C114 1000pF READY D115 5.6V RR119 220K R138 10K C113 1000pF READY R139 12K

JK100 PPJ209-02 COMP2_R

COMPONENT1
3E [RD]O_SPRING 4E[RD]CONTACT 2E [RD]1P_CAN2 5D [WH]C_LUG_L
D104 RR108 220K C116 1000pF READY R136 10K 5.6V

COMP1_R

R135 12K

+5V_ST 10 5

RS232C IC101 MAX3232CDR C109 0.1uF C110 0.1uF

JK200 PPJ148-10

SIDE AV
4 JK204 PPJ218-01 4A [YL]O_SPRING SIDE_V

5B 4B 2B 3 2

RC214 100pF 50V READY
[YL]CONTACT [YL]O_SPRING [YL]1P_CAN [WH]C_LUG_L [WH]1P_CAN [RD]CONTACT [RD]O_SPRING [RD]1P_CAN

16 SDA 15 SCL

JP1117

14 NC 13 CEC 12 CLK-

JP1118

DDC_SDA2 DDC_SCL2 CEC TMDS2_RXCTMDS2_RXC+ TMDS2_RX0TMDS2_RX0+ TMDS2_RX1TMDS2_RX1+ TMDS2_RX2TMDS2_RX2+
+5V_HDMI_2 R329 10K R328 10K
13 CEC 12 CLK11 CLK_SHIELD 10 CLK+ 9 DATA08 DATA0_SHIELD
CEC TMDS3_RXCTMDS3_RXC+ TMDS3_RX0TMDS3_RX0+ TMDS3_RX1TMDS3_RX1+ TMDS3_RX2TMDS3_RX2+

+5V_HDMI_3 R352 10K

D302 30V

17 DDC/CEC_GND

JP1116

DDC_SDA3 DDC_SCL3

R376 0

C MMBD301LT1G D304

Q306 BSS83

D B S G

TXCE0+ TXCE1+ TXCE2+ TXCLKE+ TXCE3+ TXCE4+

R431 READY 0

R332 200

CDS3C30GTH

C307 0.01uF 50V READY

HD FHD

CPT LPL 32 sharp

R428 O X X

HPD_S/W_3 TMDS2_RX2+ TMDS2_RX2-

TMDS2_RX1+ TMDS2_RX1-

11 CLK_SHIELD 10 CLK+ 9 DATA08 DATA0_SHIELD 7 DATA0+ 6 DATA15 DATA1_SHIELD 4 DATA1+ 3 DATA22 DATA2_SHIELD 1 DATA2+ 20 JACK_GND 21.

TMDS2_RX0+ TMDS2_RX0-

R351 10K
TMDS2_RXC+ TMDS2_RXCDDC_SCL2 DDC_SDA2 HPD_S/W_2

HDMI3_5V_DET

HDMI2_5V_DET
7 DATA0+ 6 DATA15 DATA1_SHIELD 4 DATA1+ 3 DATA22 DATA2_SHIELD 1 DATA2+

+5V_MULTI +5V_ST

0 R359 READY A1 A2
R407 4.7K FHD RHD TXCO0TXCO1TXCO2TXCLKOTXCO3-
+3.3V 10BIT except for 52 sharp R401 4.7K

D305 KDS184S

KDS184

R402 8BIT or 52 sharp 0

0.01uF

R370 0

R369 0

DC1R019NBH JK303

TXCO4-

R373 0

+3.3V_HDMI_SW

RREADY

JK302 QJ41193-FEE2-7F
**MULTI ITEM 1.24C02-SUB:0IMMRAL014D
R401 4.7K 10BIT X 8BIT(HD) X 8BIT(FHD) 52 sharp X 32 sharp X

R402 X 0 X

R_USE LG50_60_70 L411-*1 0
2.SMD HDMI Jack-SUB:6612B00015B +5V_ST HPD_S/W_1

+5V_HDMI_1

A1 A2 KDS184

L410-*1 0

C312 0.01uF

R345 R0

SPK-N* L G 6

Sound module output

R347 R0

R355 R0

R357 R0
+3.3V +3.3V R371 47K R365 READY 0 R360 4.7K READY
13 L400 C0.1uF EAM38769502
NOT LG60 Q402 2SA1530A-T112-1R NOT LG60 C E B R409 10K READY R410 100

HDMI_SEL1

LC401 470pF NOT LG60

EAM38769502 NOT LG60

HDMI_0+ HDMI_0-

HDMI_1+ HDMI_1-

HDMI_C+ HDMI_C-

JK301 QJ41193-FEE2-7F

HDMI_2+ HDMI_2-

AC_DET

+5V_ST R434 10K NOT LG60 C
3.3K R417 READY B 3.3K R435 NOT LG60

LED_R/PWM

HDMI_SCL HDMI_SDA

Q403 KRC102S NOT LG60 E

CONTROL KEY
NOT LG60 THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
Copyright C 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

Digital Audio AMP

+16V_NTP C615 0.1uF C617 0.1uF R604 C612 3. 3 35V 330uF C613 0.01uF
+16V_NTP C666 C620 330uF 35V 1000pF R607 3.9

+16V_NTP

C622 1000pF
+1.8V L611 UBW2012-121F EAM38769505 L603 2S DA-8580 2F 1S 1F EAP38319001
D607 READY 1N4148W D606 READY 1N4148W 100V 100V

120OHM

SMAW250-04

UBW2012-121F

R609 3.9
C637 0.1uF C632 0.47uF C636 0.1uF

R624 4.7K

C639 0.01uF R626 3.3 R625 3.3 C638 0.01uF L610 UBW2012-121F EAM38769505

SPK_L-

SPK_L+
+1.8V_AVDD EAM38769505 L615

SPK_RSPK_R+ SPK_LSPK_L+

+1.8V_DVDD

22000pF

UBW2012-121F EAM38769505

READY 30V D601

C616 22000pF

C618 1uF

R608 3.9 C619 1000pF

R610 3.9 C621 1000pF

R623 4.7K

PGND1A_2

PGND1A_1

PVDD1A_2

PVDD1A_1

PVDD1B_2

PVDD1B_1

PGND1B_2

TU500 TAFT-Z703D 1 NC_GND_6

PGND1B_1

OUT1A_2

OUT1A_1

OUT1B_2

OUT1B_1

NON EU TUNER

TU500-*1 TAFT-H703F

NTSC TUNER
NC_1 GND_1 +B[5V] NC_2 RF_AGC TP[33V_OPTION] NC_3 GND_2 DATA CLOCK AS NC_4 V-OUT AFT A-OUT SIF-OUT NC_5 NC_6 NC_7 NC_8
BST1A C608 READY 1uF D602 30V VDR1A /RESET AD VSS_IO CLK_I C642 100pF
NC_2 VDR2A BST2A PGND2A_2 PGND2A_1 OUT2A_2 OUT2A_1 PVDD2A_2 PVDD2A_1 PVDD2B_2 PVDD2B_1 OUT2B_2 OUT2B_1 PGND2B_2
D604 READY 1N4148W 100V 30V D600 READY

Chinese Hotel Option

C624 1uF +16V_NTP C625 C631 22000pF 1000pF R618 3.9 +16V_NTP C635 1000pF +16V_NTP R622 3.9
D605 READY 1N4148W 100V HOTEL_OPT P600 12505WR-09A00
+B[5V] NC_2 RF_AGC TP[33V_OPTION]

R514 0

+5V_TUNER

C521 10uF 16V

Near the pin

SW_RESET I2S_MCLK

+1.8V_AVDD C603 1000pF C601 100pF R600 3.3K +3.3V

C606 1000pF

R601 100

C503 0.01uF

L502 BLM18BD102SN1D READY

10 READY

CLK_O VDD_IO

C507 0.01uF

C510 4.7uF 35V

IC600 NTP3000A

7 NC_GND_DATA 10 CLOCK 11 AS 12 NC_V-OUT 14 AFT 15 A-OUT 16 SIF-OUT 17 NC_NC_NC_NC_SHIELD

AGNDPLL LFM AVDDPLL

10K R648

C626 0.1uF

C629 0.1uF

1S 1F EAP38319001

C643 R627 0.1uF 4.7K
R635 3.3 C647 0.01uF L612 UBW2012-121F EAM38769505

10K R631 HOTEL_OPT

C605 0.1uF

DGNDPLL

L607 2S DA-8580 2F
C644 R628 0.1uF 4.7K C640 0.47uF

C648 0.01uF R636 3.3

SPK_R+

AUDIO_R

HOTEL_OPT
L613 UBW2012-121F EAM38769505

4 SW_RESET 5

RRC501 27pF C502 27pF

R504 4.7K

R508 4.7K

SPK_RAMP_MUTE_HOTEL

6 HOTEL_OPT HOTEL_OPT C669 4.7uF 10V C B HOTEL_OPT Q609 RT1C3904-T112 E SPK_R-_HOTEL SPK_R+_HOTEL 8

+5V_TUNER R518 R0

+1.8V_AVDD C600 10uF 16V C602 0.1uF

DVDDPLL NC_1

SDA_TUNER

L501 UBW2012-121F

R617 3.9 C630 1000pF

R621 3.9 C634 1000pF