LG 42PC51 Service Manual
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LG 42PC51 Service Manual

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PLASMA TV

SERVICE MANUAL

CHASSIS : PP78A
MODEL : 42PC51
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
website:http://biz.LGservice.com
42PC51-ZB

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Summary of Contents for LG 42PC51

  • Page 1: Service Manual

    PLASMA TV SERVICE MANUAL CHASSIS : PP78A MODEL : 42PC51 42PC51-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ....................2 SAFETY PRECAUTIONS ................3 SPECIFICATION ..................4 ADJUSTMENT INSTRUCTION ..............6 TROUBLE SHOOTING ................16 BLOCK DIAGRAM...................24 EXPLODED VIEW .................. 26 EXPLODED VIEW PARTS LIST ............27 REPLACEMENT PARTS LIST ............... 28 SVC. SHEET ....................PRINTED CIRCUIT DIAGRAM ..............- 2 -...

  • Page 3: Safety Precautions

    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 X-RADIATION, Shock, Fire, or other Hazards.

  • Page 4: Specification

    Plasma Display Panel Aspect Ratio 16:9 PDP Module PDP42X4, Clear Filter RGB Closed Type Operating Environment 1)Temp. : 0~40deg LGE SPEC. 2)Humidity : 0~85% Storage Environment 3)Temp. : -20~60deg 4)Humidity : 0~85% Input Voltage 100-240V~, 50/60Hz Maker : LG - 4 -...
  • Page 5 Module Specification1 (PDP42X4) Item Unit Remark Display area 921.5 (H) * 519.0(V)±0.5 1005 (W) x 597 (H) x 60.7 (D)±1 Outline dimension 1024 (H) x 768(V) Number of Pixels 1Pixel=3RGB Cells Cell pitch 300um (H) x 676um (V) 1Pixel=3RGB Cells RGB closed type Color arrangement 13.8...

  • Page 6: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 1. Application Object LPT Port Driver (LptDrv) Setups : Program Files > Micronas > Visual I2C > Port_Driver These instructions are applied all of the 42” PLASMA TV, *Use for Windows 95/98 : Setup_LptDrv_v0104_9x.exe PP78A Chassis. *Use for Windows 2000/XP : Setup_LptDrv_v0202_XP_2000.exe *Use for Windows NT : Setup_LptDrv_v0104_NT.exe 2.
  • Page 7 (1) Connect the download jig to D-sub jack. (2) Execute ‘Download.vi2c’ program in PC, then a main window will be opened. (3) Double click the blue box and confirm "Bootloader Version" as 42. => Select the "Bootloader.bat" file. (install > VCTP_download > Bootloader) =>...
  • Page 8 (8) Click OK button at the "edit window". (5) Double click the blue box and confirm "Bootloader Version" as 42. (9) Under Downloading process. (10) If download is failed, for example "No acknowledge from slave". Execute download again from(1). (6) Click the "Erase Flash" button. 6-2.Download method 2 (AV Plate Ass’y) (7) Double click the download file low then, "edit"...
  • Page 9 (11) Click OK button at the "edit window". (4) Click "GO" button. If you don’t push the “go”, the Hex file would not be downloaded although the download proceeds normally at first glance. (12) Under Downloading progress. (5) Double click the blue box and confirm "Bootloader Version"...
  • Page 10 (10) Choose the Hex file in folder and execute downloading 7-4. Connection condition with click "open button". (1) IC name and circuit number : VCTP and IC500. (2) Use voltage : 3.3V. (3) SCL : 15pin. (4) SDA : 12pin. (5) Tact time : about 3seconds.

  • Page 11: Adjustment Method

    8. Tool Option Area Option Change Each PCB assembly must be checked by check JIG set. (Because power PCB Assembly damages to PDP Module, especially be careful) 8-1. Profile : Must be changed the option value because being different with some setting value depend on module, inch and market.
  • Page 12 11. EDID 11-5. Sequence of Adjustment (The Extended Display Identification Data ) /DDC download (1) DDC data of Analog-RGB (Display Data Channel) 1) Init the data. 11-1. Profile : To be possible for plug and play. 11-2. Required Test Equipment (1) Adjusting PC with S/W for writing EDID Data.
  • Page 13 3. Month, Year : Controlled on production line ex) Monthly: '03' => '03' Year: '2005' => '0F' 4. Model Name : model name -> LG TV - LG TV 5. Checksum (7EH) -> Changeable by total EDID data. - 13 -...

  • Page 14: Adjustment Mode

    12. Adjustment of White Balance (3) DDC adjustment support command set. Adjustment CMD(HEX) VALUE Detail 12-1. Purpose and Principle for adjustment OO : OFF Aging On/Off FF/00 01 : ON of the color temperature FF : WB Ready (1) Purpose : Adjust the color temperature to reduce the deviation of the module color temperature.

  • Page 15: White Balance

    * Refer to the below case to know what value is fixed. * CASE - First adjust the coordinate much 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.

  • Page 16: Troubleshooting

    TROUBLESHOOTING 1. No power (1) Symptom 1) Minute discharge does not occur at module. 2) Front LED does not activate. (2) Press check Start Check Is the power cord Plug in the power cord plugged in? Connect the cable. Are the line filter and Plasma(CN1) PSU connected? Is the correct fuse for...
  • Page 17 2. Protect mode (1) Symptom 1) After lighting once it does not discharge minutely from the module. 2) The relay falls.(there is an audible “Click”.) 3) The color of the front LED turns from green to red. (2) Follow check Start Check Is the output the normal Low/High Is the Power Board...
  • Page 18 3. No Raster (1) Symptom 1) No OSD or image are displayed on the screen. 2) The front LED remains green. (2) Follow check Start Check Does Is output the normal Replace the Is the inverter minute discharge Low/High voltage except Power board.
  • Page 19 5. In the case of an unusual display in rear AV mode. Is video input of the A/V jack normal? Check the input source. (Check R172) Sam as Block A 6. In the case of an unusual display in Side AV mode. Is the video input Check the input source.
  • Page 20 8. In the case of an unusual display in SCART 1 mode. Is the video input Check the input source. of the A/V jack normal? (Check R172) Sam as Block A 9. In the case of an unusual display in SCART 1_RGB mode. Is the video input of the A/V jack normal?(Check...
  • Page 21 11. In the case of an unusual display in component 1 mode. Is the video input of the A/V jack Check the input source. normal? (Check R248, R249,R250) Change IC(IC500) 12. In the case of an unusual display in component 2 mode. Is the video input of the A/V Jk202 Check the input source.

  • Page 22: No Sound

    14. No Sound (1) Symptom 1) LED is green. 2) There is a picture but no sound. (2) Follow check Set speaker on Is the speaker Is there sound in any in the menu. mode? Is the speaker Is there no sound Check the Speaker Download the EDID data.

  • Page 23: Hdmi Mode

    15. HDMI mode Is only video Download EDID data each port. normal? 1. Check TV input mode. (HDMI 1 port support HDMI and DVI. So if you input DVI signal and PC audio from phone jack, You can hear PC audio.) Is only audio 2.

  • Page 24: Block Diagram

    BLOCK DIAGRAM - 24 -...
  • Page 25 MEMO - 25 -...

  • Page 26: Exploded View

    EXPLODED VIEW - 26 -...

  • Page 27: Exploded View Parts List

    Hand Insert PCB Assembly, SUB M.I PP78A 42PC5R-ZB.SKD . H4 PREAMP HAND INSERT EAY32808901 SMPS, AC/DC YPSUJ014A 100VTO240V 400W 50 TO 60HZ UL/CSA/CE/TUV 42INCH XPOWER DISPLAY PSU LG.. EAM35012703 Filter, AC Line IF2-N06CEWL2 5.3mH 250VAC 6A 0.22uF 1000pF VDE/CSA/K/CCC 450/130MM CORE ADDTION..

  • Page 28: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2007. 03. 02. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION CAPACITORs C312 0CK103CK51A 0603B103K500CT 10nF 10% 50V Y5P - C316 0CE106WFKDC MVK4.0TP16VC10M 10uF 20% 16V 16MA C100 0CH5101K416 C2012C0G1H101JT 100pF 5% 50V C0G C317 0CK103CK56A 0603B103K500CT 10nF 10% 50V X7R -...
  • Page 29 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C532 0CK332CK56A C1608X7R1H332KT 3.3nF 10% 50V X7R C618 0CK475EF67A C3216X5R1C475MT 4.7uF 20% 16V X5R C533 0CE106WH6DC MVK5.0TP25VC10M 10uF 20% 25V 25MA C619 0CK102CK56A 0603B102K500CT 1nF 10% 50V X7R -5 C534 0CK104CK56A 0603B104K500CT 100nF 10% 50V X7R...
  • Page 30 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C812 0CK103CK56A 0603B103K500CT 10nF 10% 50V X7R - D205 EAH33945901 CDS3C30GTH 30V 50V 120V 1.9A 1W S C813 0CE107WF6DC MVK6.3TP16VC100M 100uF 20% 16V 80 D206 EAH33945901 CDS3C30GTH 30V 50V 120V 1.9A 1W S C814 0CK104CK56A...
  • Page 31 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION AL311 6210TCE002B HB-4M3216-121JT 120OHM 3.2X1.6X1. L807 6210TCE001G HH-1M3216-501JT 500OHM 3.2X1.6X1. AL312 6210TCE002B HB-4M3216-121JT 120OHM 3.2X1.6X1. L808 6210TCE001G HH-1M3216-501JT 500OHM 3.2X1.6X1. AL313 6210TCE002B HB-4M3216-121JT 120OHM 3.2X1.6X1. X300 6202TST001H Crystal, SX-1 27MHZ 30PPM 27MHZ 30PPM 20pF 6210VH0004A...
  • Page 32 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION RESISTORs R140 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10W 160 R141 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10W 160 L402 0RJ0000G676 MCR18EZHJ000_ 0OHM 5% 1/4W 3216 R R153 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1608 R L710 0RH0000D622 MCR10EZHJ000 0OHM 5% 1/8W 2012 R/...
  • Page 33 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R248 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W 1608 R337 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W 1608 R249 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W 1608 R338 0RJ0222D677 MCR03EZPJ220 22OHM 5% 1/10W 1608 R250 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W 1608...
  • Page 34 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R506 0RJ1500D677 MCR03EZPJ151 150OHM 5% 1/10W 1608 R570 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1608 R R508 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W 1608 R573 0RJ2702D677 MCR03EZPJ273 27KOHM 5% 1/10W 1608 R509 0RJ2000D477 MCR03EZPF201 200OHM 1% 1/10W 1608...
  • Page 35 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R807 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1608 R JK200 6612J10031A PPJ209-02 14.0MM 1RX5C STRAIGHT T R808 0RJ2000D677 MCR03EZPJ201 200OHM 5% 1/10W 1608 JK204 6612F00099A PEJ024-01 1P 4P STRAIGHT TR 3.6MM R809 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10W 160...
  • Page 39 PRINTED CIRCUIT BOARD MAIN(TOP) MAIN(BOTTOM) CONTROL(TOP) IR/LED CONTROL(BOTTOM) SIDE A/V(TOP) SIDE A/V(BOTTOM)
  • Page 40 Mar., 2007 P/NO : MFL38559902 Printed in Korea...

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