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LG 42LB9R Service Manual
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LG 42LB9R Service Manual

LG 42LB9R Service Manual

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See also: Owner's Manual
LCD TV

SERVICE MANUAL

CHASSIS : LP78A
MODEL : 42LB9R
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
42LB9R-TD

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Summary of Contents for LG 42LB9R

  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : LP78A MODEL : 42LB9R 42LB9R-TD 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

    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 5.1. Sequence of Adjustment 6. Adjustment of White Balance (1) DDC data of Analog-RGB 6.1 Required Equipment 1) Init the data (1) Remote control for adjustment (2) Color Analyzer (CA-110 or CA-210 or same product) (3) Auto W/B adjustment instrument(only for Auto adjustment) 6.2 Connecting diagram of equipment for measuring (For Automatic Adjustment)

  • Page 16: White Balance

    6.3. Adjustment of White Balance 7. Default Value in Adjustment mode (For Manual adjustment) (Default values maybe modified the module condition) - Operate the zero-calibration of the CA-110 or CA-210, then 7.1. White Balance stick sensor to LCD module when you adjust. - For manual adjustment, it is also possible by the following sequence 1) Select RF no signal by pressing “POWER ON”...

  • 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: No Sound

    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: Hdmi Mode

    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

    DESCRIPTION EAB37526301 Speaker,Full Range, C103A02K1400 ND 7W 8OHM 81DB 160HZ 122 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 ABJ32993203 Cabinet Assembly, 42LB9 LA73A 42" EVE_AUS CABINET ASSEMBLY ACQ33924403 Cover Assembly,Rear, 42LB9R-TD lP78A 42"...

  • Page 28: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2007. 07. 12. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ACCESSORY C815 0CE107WF6DC "Capacitor,AL,Chip" MVK6.3TP16VC100M 100uF MFL37396704 "Manual,Owners" PRINTING USER LP78A BR C816 0CE107WF6DC "Capacitor,AL,Chip" MVK6.3TP16VC100M 100uF MKJ39170806 Remote Controller COMPLEX PA71A 50PBRT W C820 0CE107WF6DC "Capacitor,AL,Chip"...
  • Page 29 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C215 0CK105CF94A "Capacitor,Ceramic,Chip" 0603F105Z160CT 1uF -20 C525 0CK474CH94A "Capacitor,Ceramic,Chip" 0603F474Z250CT 470nF - C216 0CK105CF94A "Capacitor,Ceramic,Chip" 0603F105Z160CT 1uF -20 C526 0CK474CH94A "Capacitor,Ceramic,Chip" 0603F474Z250CT 470nF - C217 0CK105CF94A "Capacitor,Ceramic,Chip"...
  • Page 30 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C625 0CK105DK94A "Capacitor,Ceramic,Chip" 0805F105Z500CT 1uF -20 C837 0CK103CK56A "Capacitor,Ceramic,Chip" 0603B103K500CT 10nF 10 C626 0CK105DK94A "Capacitor,Ceramic,Chip" 0805F105Z500CT 1uF -20 C838 0CK106EF56A "Capacitor,Ceramic,Chip" C3216X7R1C106KT 10uF 1 C627 0CK105DK94A "Capacitor,Ceramic,Chip"...
  • Page 31 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC601 EAN35502001 "IC,Audio Amplifier" TPA3107D2 10TO26V 50mV L509 6210TCE001B "Filter,Bead" HH-1H3216-500JT 50OHM IC600 0IPRP00665A "IC,Bus Controller" TEA6420D 8TO10.2V 8mA L510 6210TCE001B "Filter,Bead" HH-1H3216-500JT 50OHM IC203 0IFA742530B "IC,CMOS"...
  • Page 32 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q602 0TRIY80001A "TR,Bipolar" 2SC3052 NPN 6V 50V 50V R110 0RJ0000D677 "Resistor,Chip" MCR03EZPJ000 0OHM 5% 1 Q603 0TRIY80001A "TR,Bipolar" 2SC3052 NPN 6V 50V 50V R113 0RJ0000D677 "Resistor,Chip" MCR03EZPJ000 0OHM 5% 1 Q701 0TRIY80001A "TR,Bipolar"...
  • Page 33 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R247 0RJ0000D677 "Resistor,Chip" MCR03EZPJ000 0OHM 5% 1 R328 0RJ2001D677 "Resistor,Chip" MCR03EZPJ202 2KOHM 5% R248 0RJ0332D677 "Resistor,Chip" MCR03EZPJ330 33OHM 5% R329 0RJ2001D677 "Resistor,Chip" MCR03EZPJ202 2KOHM 5% R249 0RJ0332D677 "Resistor,Chip"...
  • Page 34 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R508 0RJ1000D677 "Resistor,Chip" MCR03EZPJ101 100OHM 5% R570 0RJ0000D677 "Resistor,Chip" MCR03EZPJ000 0OHM 5% 1 R509 0RJ2000D477 "Resistor,Chip" MCR03EZPF201 200OHM 1% R573 0RJ2702D677 "Resistor,Chip" MCR03EZPJ273 27KOHM 5% R510 0RJ1001D677 "Resistor,Chip"...
  • Page 35 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION CONNECTOR R723 0RJ2002D677 "Resistor,Chip" MCR03EZPJ203. 20KOHM 5 R725 0RJ1000D677 "Resistor,Chip" MCR03EZPJ101 100OHM 5% JK201 6630TGA004K "Connector,DSUB" KCN-DS-1-0089 D-SUB 15 R726 0RJ1000D677 "Resistor,Chip" MCR03EZPJ101 100OHM 5% CN501 6602T25009B "Connector,Wafer"...
  • Page 39 Jul., 2007 P/NO : MFL36696941 Printed in Korea...

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