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LG 42LC51 Service Manual
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LG 42LC51 Service Manual

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LCD TV
SERVICE MANUAL
CHASSIS : LP78A
MODEL : 42LC51
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
e-mail:http://www.LGEservice.com/techsup.html
42LC51-ZA
R
website:http://biz.LGservice.com

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Summary of Contents for LG 42LC51

  • Page 1 LCD TV SERVICE MANUAL CHASSIS : LP78A MODEL : 42LC51 42LC51-ZA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ....................2 SAFETY PRECAUTIONS ................. 3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ..............9 TROUBLE SHOOTING ................17 BLOCK DIAGRAM.................. 25 EXPLODED VIEW .................. 26 REPLACEMENT PARTS LIST ............... 28 SVC. SHEET ....................- 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 Shock, Fire, or other Hazards.
  • Page 4 SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service unit under test. manual and its supplements and addenda, read and follow the 2. After removing an electrical assembly equipped with ES SAFETY PRECAUTIONS on page 3 of this publication. devices, place the assembly on a conductive surface such as NOTE: If unforeseen circumstances create conflict between the aluminum foil, to prevent electrostatic charge buildup or...
  • Page 5 IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through Circuit Board Foil Repair which the IC leads are inserted and then bent flat against the Excessive heat applied to the copper foil of any printed circuit circuit foil. When holes are the slotted type, the following technique board will weaken the adhesive that bonds the foil to the circuit should be used to remove and replace the IC.

  • Page 6: Specification

    SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range (4) Specification and performance of each parts are followed each drawing and specification by part number in This specification is applied to LP78A chassis. accordance with BOM.
  • Page 7 5. Model Specification(EU) Item Specification Remark Market Broadcasting system PAL BG/DK, PAL I/II, SECAM L/L’ Available Channel BAND VHF/UHF C1_C69 CATV S1_S47 Receiving system Upper Heterodyne SCART Input(2EA) PAL, SECAM, NTSC Full Scart 1EA, Harf 1EA Video Input (1EA) PAL, SECAM, NTSC Side AV S-Video Input (1EA) PAL, SECAM, NTSC...
  • Page 8 8. HDMI input (DTV) Resolution H-freq(kHz) V-freq(kHz) Pixel clock(MHz) Proposed 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I) 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I) 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz 720*480 31.47 59.94 27.000 SDTV 480P 720*480 31.50 60.00 27.027 SDTV 480P...

  • Page 9: Adjustment Instruction

    *Use for Windows 95/98 : Setup_LptDrv_v0104_9x.exe This spec sheet is applied all of the 26/32/37/42” LCD *Use for Windows 2000/XP : Setup_LptDrv_v0202_XP_2000.exe TV(LP78A) by manufacturing LG TV Plant all over the world. *Use for Windows NT : Setup_LptDrv_v0104_NT.exe 2. Specification (3) Verification (Start >...
  • Page 10 3) Double click the blue box and confirm "Bootloader Version" as 42. 4) Click the "Erase Flash" button => Select the "Bootloader.bat" file(install > VCTP_download > Bootloader) => Push "OK" 5) Double click the download file low, then "edit" window will be opened =>...
  • Page 11 8) Click OK button at the "edit window". 4) Execute ‘Download.vi2c’ program in PC, then a main 9) Under Downloading process widow will be opened. 10) If download is failed, for example "No acknowledge from slave". Execute download again from(1). (2) Download method 2 (AV Plate Ass’y) 5) Double click the blue box and confirm "Bootloader Version"...
  • Page 12 9) Choose the Hex file in folder and execute downloading 2) Connect Zig to TV using a D-sub cable. with click "open button". 3) Execute ‘Download_CS.vi2c’ program in PC, then a 10) Click OK button at the "edit window" main widow will be opened. 4) Click "GO"...
  • Page 13 7) Double click the download file low then, "edit" window 12) If download is failed, for example "No acknowledge will be opened. from slave", execute download again from (1). 8) Chick the choice button I n the "edit window", then "file 4.3.
  • Page 14 5. EDID (5) Push the Update NVM from File (The Extended Display Identification Data ) /DDC download (Display Data Channel) * Caution - Use the proper signal cable for EDID Download. - Never connect HDMI & D-SUB Cable at the same time. - Use the proper cables below for EDID Writing.
  • Page 15 => Detail EDID Options are below(a, b, c, d, e) 4) Push the “Write Data & Verify”button. And confirm “Yes”. 5) If the writing is finished, you will see the “OK” message. a. Product ID <EDID DATA> 6. Adjustment of White Balance b.
  • Page 16 (3) DDC adjustment support command set 6.4 Input the Shipping Option Data Adjustment CMD(HEX) 1) Push the ADJ key in a Adjust Remote control. Aging On/Off FF : ON / OO : OFF 2) Input the Option Number that was specified in the BOM, into the Shipping area.

  • Page 17: Troubleshooting

    TROUBLESHOOTING 1. No power (1) Symptom 1) It is not discharged minutely from the module. 2) Light does not come into the front LED. (2) Check process Is plug in power Plug in a power cord cord inserted ? Connect a cable. Is the Line Filter and Plasma(CN1), LCD(SC100) PSU connected?
  • Page 18 2. Protect mode (1) Symptom 1) After once shining, it does not discharge minutely from module. 2) The relay falls.(The sound is audible “Click”.) 3) It is converted with the color where the front LED is red from green. (2) Check following Is output the normality Low/High Is the Power Board Replace Power Board.
  • Page 19 3. No Raster (1) Symptom 1) No OSD and image occur at screen. 2) It maintains the condition where the front LED is green. (2) Check following Does Is output the normality Replace the Is the inverter minute discharge Low/High voltage Power board.
  • Page 20 5. In case of becomes unusual display from rear AV mode. Is video input of Check the input source. the A/V jack normal? (Check R172) Sam as Block A 6. In case of becomes unusual display from Side AV mode. Is video input of the A/V jack normal? Check the input source.
  • Page 21 8. In case of becomes unusual display from SCART 1 mode. Is video input of the A/V jack normal? Check the input source. (Check R172) Sam as Block A 9. In case of becomes unusual display from SCART 1_RGB mode. video input of the A/V jack normal?(Check Check the input source.
  • Page 22 11. In case of becomes unusual display from component 1 mode. Is video input of the A/V jack Check the input source. normal? (Check R248, R249,R250) Change IC(IC500) 12. In case of becomes unusual display from component 2 mode. Is video input of the A/V jack Check the input source.
  • Page 23 14. No Sound (1) Symptom 1) LED is green. 2) Screen display but sound is not output. (2) Check following All input(mode) Is the speaker Set on speaker in menu. is no sound. on it men? Is the speaker Only HDMI is Check the Speaker Download the EDID data.
  • Page 24 15. HDMI mode In 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.) 2.

  • Page 25: Block Diagram

    - 25 -...
  • Page 26 - 26 -...

  • Page 27: Exploded View

    Speaker,Full Range, EN1562C-6712 ND 10W 8OHM 82DB 100HZ 193.5 X 42 X 39.9 LUG KOREA TOPTONE EAJ36547901 LCD,Module-TFT, LC420WX6-SLA2 WXGA 42INCH 1366X768 500CD COLOR 72% 16/9 1000:1(DCR 5000:1) 5ms(GTG),Zero RT Pol. 10000K LG PHILIPS LCD ABJ32403510 Cabinet Assembly, 42LC7R-ZA H4 42" CABINET ASSY "02" C/SKD ACQ32247913 Cover Assembly, 42LC7R-ZA LP78A 42"...

  • Page 28: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2007. 03. 24. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ACCESSORY C815 0CE107WF6DC "Capacitor,AL,Chip" MVK6.3TP16VC100M 100uF C816 0CE107WF6DC "Capacitor,AL,Chip" MVK6.3TP16VC100M 100uF MFL37396705 "Manual,Owners" PRINTING USER LP78A BRA C820 0CE107WF6DC "Capacitor,AL,Chip"...
  • Page 29 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C309 0CK103CK56A "Capacitor,Ceramic,Chip" 0603B103K500CT 10nF 10% C549 0CK104CK56A "Capacitor,Ceramic,Chip" 0603B104K500CT 100nF 10 C310 0CC180CK41A "Capacitor,Ceramic,Chip" C1608C0G1H180JT 18pF 5% C550 0CK104CK56A "Capacitor,Ceramic,Chip" 0603B104K500CT 100nF 10 C312 0CK103CK51A "Capacitor,Ceramic,Chip"...
  • Page 30 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C638 0CK105DK94A "Capacitor,Ceramic,Chip" 0805F105Z500CT 1uF -20T D302 0DSIH00028A "Diode,Switching" MC2838-T112-1 1.2V 75V C639 0CK105DK94A "Capacitor,Ceramic,Chip" 0805F105Z500CT 1uF -20T D600 0DSIH00028A "Diode,Switching" MC2838-T112-1 1.2V 75V C642 0CK104CK56A "Capacitor,Ceramic,Chip"...
  • Page 31 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC303 0IPRP00735A "IC,I/O Support Chip" ANX9021 3.3V 60u 17MHZ L706 6200J00005N "Filter,Bead" HH-1M2012-121JT(H:1mm) IC802 0IPMG78341A "IC,LDO Voltage Regulator" "AZ1085S-3.3TR/E1,LF 12V" L707 6210TCE001A "Filter,Bead" HB-1S2012-080JT 8OHM 2X IC803 0IPMG78341A "IC,LDO Voltage Regulator"...
  • Page 32 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q500 0TR102009AM "TR,Bipolar" KRA102S PNP -30V 0V -50 R107 0RH1101D622 "Resistor,Chip" MCR10EZHJ112 1.1KOHM 5% Q501 0TRIH80002A "TR,Bipolar" 2SA1530A-T112-1R PNP -6 R107 0RH3301D622 "Resistor,Chip" MCR10EZHJ332 3.3KOHM 5% Q502 0TRIH80002A "TR,Bipolar"...
  • Page 33 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R206 0RJ0752D677 "Resistor,Chip" MCR03EZPJ750 75OHM 5% 1 R317 0RJ0122D677 "Resistor,Chip" MCR03EZPJ120 12OHM 5% 1 R207 0RJ0752D677 "Resistor,Chip" MCR03EZPJ750 75OHM 5% 1 R318 0RJ0122D677 "Resistor,Chip" MCR03EZPJ120 12OHM 5% 1 R208 0RJ0752D677 "Resistor,Chip"...
  • Page 34 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R401 0RJ3300D677 "Resistor,Chip" MCR03EZPJ331 330OHM 5% R544 0RJ1001D677 "Resistor,Chip" MCR03EZPJ102 1KOHM 5% 1 R402 0RJ3300D677 "Resistor,Chip" MCR03EZPJ331 330OHM 5% R545 0RJ1001D677 "Resistor,Chip" MCR03EZPJ102 1KOHM 5% 1 R404 0RJ7501D677 "Resistor,Chip"...
  • Page 35 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R634 0RJ1003D677 "Resistor,Chip" MCR03EZPJ104 100KOHM 5% SW104 140-313B "Switch,Tact" KPT-1115AM 1C1P 12VDC 0 R635 0RH0000D622 "Resistor,Chip" MCR10EZHJ000 0OHM 5% 1/ SW105 140-313B "Switch,Tact" KPT-1115AM 1C1P 12VDC 0 R636 0RH0000D622 "Resistor,Chip"...
  • Page 39 Mar., 2007 P/NO : MFL36696929 Printed in Korea...

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