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LG 37LF2500 Service Manual
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LG 37LF2500 Service Manual

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LCD TV
SERVICE MANUAL
CHASSIS : LD91A
MODEL : 37LF2500
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL50326818 (0904-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
37LF2510
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
37LF2500-ZA
37LF2510-ZB
Printed in Korea

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  • Page 1 North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LCD TV SERVICE MANUAL CHASSIS : LD91A MODEL : 37LF2500 37LF2500-ZA MODEL : 37LF2510 37LF2510-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL50326818 (0904-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ....................2 PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ..............9 EXPLODED VIEW .................. 14 SVC. SHEET ....................Copyright ©2009 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Product Safety

    An other abnormality exists that must be corrected before the receiver is returned to the customer. Copyright ©2009 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...
  • Page 4 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 Copyright ©2009 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only...
  • Page 5 CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. Copyright ©2009 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Specification

    877.0 (H) x 516.8 (V) x 55.5 (D) Pixel Pitch 0.42675 mm(D) Back Light EEFL Display Colors 1.06Billion(FHD LGD),16.7M (others) Coating 3H, AG Copyright ©2009 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 HDTV 1080i 1920x1080 33.75 60.00 HDTV 1080i 1920x1080 33.72 59.94 HDTV 1080i 1920x1080 56.250 HDTV 1080p 1920x1080 67.5 HDTV 1080p Copyright ©2009 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 HDCP 1280*1024 63.595 60.0 108.875 SXGA HDCP 1600*1200 74.07 59.98 130.375 UXGA HDCP 1920*1080 66.647 59.988 138.625 WUXGA HDCP Copyright ©2009 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...

  • Page 9: Adjustment Instruction

    3. Click “Read” tab, and then load download file (XXXX.bin) by clicking “Read” fi lexxx.bin Copyright ©2009 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 4) RGB (PC : 1024 x 768 @ 60hz) 5) HDMI 6) PC Audio In * Display and Sound check is executed by Remote control. Copyright ©2009 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 C0. (when R/G/B Gain are all C0, it is the FULL Dynamic Range of Module) Copyright ©2009 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 ⓔ Checksum: Changeable by total EDID data. ⓕ Vendor Specific(HDMI) INPUT MODEL NAME(HEX) HDMI1 67030C001000B82D HDMI2 67030C002000B82D HDMI3 67030C003000B82D Copyright ©2009 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 Confirm whether is normal or not when between power board's ac block and GND is impacted on 1.5kV(dc) or 2.2kV(dc) for one second Copyright ©2009 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...

  • Page 14: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 SCHEMATIC DIAGRAM MAIN 1 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 AUDIO OUT LVDS OUT AUDIO IN Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 DDR2 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 INTERFACE USB DOW N STREAM USB DOW N STREAM Fi b e r Op t i c Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 PCMCIA Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 HDMI Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 Block diagram Main Block - 19/22/26/32/37/42LH2000 - 32/37/42/47LH3000 Block Diagram Block Diagram - 32/37/42/47LH4000 LCD Panel BUF_TS_CLK/ERR/SYN/DATA[0] LVDS (10 bit) CI_TS_DATA[0:7] Reset 74LX1G14C KIA7027 PCM_D[0:7] CI_DATA[0:7] FE_TS_DATA[0:7] CI_MDI[0:7] (IC108) (IC101) Serial Flash Schmitt Trigger Voltage Detector IC103 CI_ADDR[0:7] PCM_A[0:7] For Boot Serial Flash IC104 FE_VMAIN...
  • Page 24 Block diagram M+S T-Con Block Only for 37LH4000 *M+S : Main B/D + T-con B/D 37 GIP Block Diagram 37 GIP Block Diagram To Left LCD Panel To Right LCD Panel VCC VDD mini-LVDS Wafer P VCOM P-Gamma IC BUF16821 GAMMA IC402 GVST...
  • Page 25 Block diagram M+S T-Con Block Only for 42/47LH4000 *M+S : Main B/D + T-con B/D 42/47 Normal Block Diagram 42/47 Normal Block Diagram To Left LCD Panel To Right LCD Panel mini-LVDS Wafer P VCOM P-Gamma IC BUF16821 GAMMA IC402 DDR_A_D[0:15] FRC_3.3V DDR2 SDRAM...
  • Page 26 Contents of LCD TV Standard Repair Process Error symptom (High category) Error symptom (Mid category) Page Remarks No video/Normal audio No video/No audio Video error, video lag/stop A. Video error Color error Vertical/Horizontal bar, residual image, light spot, external device color error No power B.
  • Page 27 Standard Repair Process Established A. Video error 2008. 3 .05 Error date LCD TV symptom No video/ Normal audio Revised date 1/13 First of all, Check whether all of cables between board is inserted properly or not. (Main B/D Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,) Replace Main Board No video Normal...
  • Page 28 Standard Repair Process Established A. Video error 2008. 3 .05 Error date LCD TV symptom No video/ No audio Revised date 2/13 Check various Check and Normal voltages of Power No Video/ replace voltage? Board ( 5V,12V,20V No audio MAIN B/D or 24V…) Replace Power Board and repair...
  • Page 29 Standard Repair Process Established A. Picture Problem 2008. 3 .05 Error date LCD TV symptom Picture broken/ Freezing Revised date 3/13 . By using Digital signal level meter . By using Diagnostics menu on OSD Check RF Signal level ( Menu Setup Diagnostic) - Signal strength (Normal : over 50%) - Signal Quality (Normal: over 50%) Check whether other equipments have problem or not.
  • Page 30 Standard Repair Process Established A. Video error 2008. 3 .05 Error date LCD TV symptom Color error Revised date 4/13 Other Module Replace module Check Check color by input Replace and replace -External Input T-Con Color Color Color Color Link Cable -COMPONENT Replace Main B/D Board...
  • Page 31 Standard Repair Process Established A. Video error 2008. 3 .05 Error date LCD TV symptom Vertical / Horizontal bar, residual image, Revised date 5/13 light spot, external device color error LGD Module Only Other Module Vertical/Horizontal bar, residual image, light spot Replace T-Con Board Replace And Adjust VCOM...
  • Page 32 Standard Repair Process Established B. Power error 2008. 3 .05 Error date LCD TV symptom No power Revised date 6/13 DC Power on Replace Check Power LED Normal Check Power by pressing Power Key Power Power LED operation? On ‘”High” On Remote control .
  • Page 33 Standard Repair Process Established B. Power error 2008. 3 .05 Error date LCD TV symptom Off when on, off while viewing, power auto on/off Revised date 7/13 Check outlet Check Power Off Check A/C code Error? Normal? Replace Main B/D Mode Abnormal Check for 3 wave length...
  • Page 34 Standard Repair Process Established C. Audio error 2008. 3 .05 Error date LCD TV symptom No audio/ Normal video Revised date 8/13 Check user Check audio B+ No audio Normal menu > 20V or 24V of Screen normal voltage Speaker off Power Board Cancel OFF and describe Replace Power Board and repair parts...
  • Page 35 Standard Repair Process Established C. Audio error 2008. 3 .05 Error date LCD TV symptom Wrecked audio/ discontinuation/noise Revised date 9/13 Wrecked audio/discontinuation/noise is same after “Check input signal” compared to No audio Wrecked audio/ Check and replace Discontinuation/ Check audio speaker and Noise for B+ Voltage (20V or 24V)
  • Page 36 Standard Repair Process Established D. General Function Problem 2008. 3 .05 Error date LCD TV symptom Remote control & Local switch checking Revised date 10/13 1. Remote control (R/C) operating error Replace Main B/D Check & Repair Check R/C itself Check B+ 5V Check IR Normal...
  • Page 37 Standard Repair Process Established D. Function error 2008. 3 .05 Error date LCD TV symptom External device recognition error Revised date 11/13 Check technical Check External Input and information Signal Technical input Component Replace Main B/D input? - Fix information information? Recognition error signal...
  • Page 38 Standard Repair Process Established E. Noise 2008. 3 .05 Error date LCD TV symptom Circuit noise, mechanical noise Revised date 12/13 Replace inverter <With Inverter Module> Identify Check Circuit nose location of noise type noise <Without Inverter Module> Replace LIPS B/D Mechanical Check location noise...
  • Page 39 Standard Repair Process Established F. Exterior defect 2008. 3 .05 Error date LCD TV symptom Exterior defect Revised date 13/13 Module Zoom part with Replace module Adjust VCOM exterior damage damage Cabinet Replace cabinet damage Remote controller Replace remote controller damage Stand Replace stand...
  • Page 40 LCD TV Repair Process Index - Trouble shooting by input block (Component level check) Symptom (L) Input Block Page Remark Power Problem Power-up Boot fail No OSD Digital TV Analog TV Video Problem AV (Scart / CVBS/ S-Video) 7~12 Component RGB(D-SUB) 14~15 HDMI...

  • Page 41: Power-Up Boot Fail

    Making 2009. 2 . 1 LCD TV Symptom Power-Up Boot Fail 1/34 Revision 26~42LH2000 P800 Pin #7~#10 Check Power connector Replace Power Board 32~47LH3000/LH4000 Voltage Level = 5V ? OK ? P800 Pin #2 Replace MAIN B’D Q801 Voltage level = 5V ? P800 Pin #13, 14 = 12V Replace Power Board P800 Pin #17, 18 = 24V ?
  • Page 42 Making 2009. 2 . 1 LCD TV Symptom Power-Up Boot Fail 2/34 Revision 19~22LH2000 P801 Pin #5~#6 Check Power connector Replace Power Board Voltage Level = 5V ? OK ? P801 Pin #1, 2 = 15V? Replace Power Board MAIN B’D L803 = 3.3V ? Replace MAIN B’D IC801 MAIN B’D L813 = 1.26V ? Replace MAIN B’D IC805...

  • Page 43: No Osd

    Making 2009. 2 . 1 LCD TV Symptom No OSD 3/34 Revision 26~42LH2000 32~47LH3000/LH4000 P800 Pin #13, 14 = 12V Check Power connector Replace Power Board P800 Pin #17, 18 = 24V ? OK ? P800 Pin #20 Replace MAIN B’D Q802 Voltage level = 2V MAIN B’D L1300 = 12V ? Replace MAIN B’D Q806...
  • Page 44 Making 2009. 2 . 1 LCD TV Symptom No OSD 4/34 Revision 19~22LH2000 Check Power connector P801 Pin #1, 2 = 15V? Replace Power Board OK ? P801 Pin #9 Replace MAIN B’D Q802 Voltage level = 2V MAIN B’D L1300 = 12V ? Replace MAIN B’D Q806 Check LVDS Cable Replace Main Board...

  • Page 45: Digital Tv

    Making 2009. 2 . 1 LCD TV Symptom Digital TV Video Problem 5/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check RF Cable MAIN B’D L1201 = 5V ? Replace MAIN B’D IC808 MAIN B’D L1202 = 3.3V ? Replace MAIN B’D IC809 MAIN B’D IC804 Replace MAIN B’D IC804 Pin #2 = 1.2V ? MAIN B’D R1210 Clock ?

  • Page 46: Analog Tv

    Making 2009. 2 . 1 LCD TV Symptom Analog TV Video Problem 6/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check RF Cable MAIN B’D L1201 = 5V ? Replace MAIN B’D IC808 MAIN B’D L1202 = 3.3V ? Replace MAIN B’D IC809 MAIN B’D IC804 Replace MAIN B’D IC804 Pin #2 = 1.2V ? MAIN B’D R1210 Clock ?

  • Page 47: Av (Scart / Cvbs/ S-Video) 7~12

    AV1(Scart CVBS) No Video Making 2009. 2 . 1 LCD TV Symptom Problem 7/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Signal format Is it supported? Check the SCART Cable Check MAIN B’D R1117 MAIN B’D JK1100 Check Replace MAIN B’D JK1100 Video Signal ? Check MAIN B’D C210 Replace Video Signal ?
  • Page 48 AV1(Scart RGB) No Video Making 2009. 2 . 1 LCD TV Symptom Problem 8/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Signal format Is it supported? Check the SCART Cable Replace MAIN B’D JK1100 Check MAIN B’D JK1100 Check MAIN B’D C200 (RED) C201 (GREEN) Replace C202 (BLUE)
  • Page 49 Making 2009. 2 . 1 LCD TV Symptom AV2 No Video Problem 9/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Signal format Is it supported? Check the SCART Cable Check MAIN B’D R1133 MAIN B’D JK1101 Check Replace MAIN B’D JK1101 Video Signal ? Check MAIN B’D C211 Replace MAIN B’D C211 Video Signal ?
  • Page 50 Making 2009. 2 . 1 LCD TV AV3(CVBS) No Video Problem Symptom 10/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Signal format Is it supported? Check the CVBS Cable Check MAIN B’D R400 MAIN B’D JK402 Check Replace MAIN B’D JK402 Video Signal ? Check MAIN B’D C217 Replace MAIN B’D C217 Video Signal ?
  • Page 51 Making 2009. 2 . 1 LCD TV Symptom AV1 No Video Out Problem 11/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Spec (Refer to User Manual) Is it supported? Check the SCART Cable Check MAIN B’D C1107 MAIN B’D JK1100 Check Video Signal ? Check the Trouble Shooting Guide Check MAIN B’D R1205 Analog TV No video...
  • Page 52 Making 2009. 2 . 1 LCD TV Symptom AV2 No Video Out Problem 12/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Spec (Refer to User Manual) Is it supported? Check the SCART Cable Check MAIN B’D C1122 MAIN B’D JK1101 Check Video Signal ? Replace MAIN B’D IC 100...

  • Page 53: Component

    Component No Video/ Making 2009. 2 . 1 LCD TV Symptom No Color Problem 13/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Signal format Is it supported? Check the Component Cable Check MAIN B’D R419 MAIN B’D JK400 Check Replace MAIN B’D JK400 Video Signal ? Check MAIN B’D C209, C215 (Y) C216 (Pb)

  • Page 54: Rgb(D-Sub) 14~15

    Making 2009. 2 . 1 LCD TV Symptom RGB No Video Problem 14/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Signal format Is it supported? Check the RGB Cable MAIN B’D P400 Pin #2 Video signal ? R437 has Vsync ? MAIN B’D P400 Check Replace MAIN B’D P400 R440 has Hsync ? Check MAIN B’D C208 (Video)
  • Page 55 Making 2009. 2 . 1 LCD TV Symptom RGB No Color Problem 15/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Signal format Is it supported? Check the RGB Cable MAIN B’D P400 Pin #3 (BLUE) MAIN B’D P400 Check Replace MAIN B’D P400 Pin #2 (GREEN) Pin #1 (RED) Video signal ?

  • Page 56: Hdmi 16~17

    Making 2009. 2 . 1 LCD TV Symptom HDMI 1~3 All No Video Problem 16/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Signal format Is it supported? Check the HDMI Cable Download EDID Check the ADJUST MENU (Refer to Adjustment Spec) EDID OK ? Replace MAIN B’D IC107 (HDCP KEY) Replace MAIN B’D IC 100...
  • Page 57 HDMI1 or 2 or 3 No Video Making 2009. 2 . 1 LCD TV Symptom Problem 17/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check Signal format Is it supported? Check the HDMI Cable MAIN B’D JACK Check JK600 -> HDMI1 JK601 -> HDMI2 JK602 ->...

  • Page 58: All Input

    Making 2009. 2 . 1 All Source no Audio Problem LCD TV Symptom 18/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check The Speaker Replace Speaker Check Speaker Cable Replace Speaker Cable CHECK MAIN B’D Replace MAIN B’D _ If headphone is connected, Speaker sound doesn’t work.

  • Page 59: Digital Tv

    Making 2009. 2 . 1 Digital TV No Audio Problem LCD TV Symptom 19/34 Revision 26~42LH2000 32~47LH3000/LH4000 Digital TV Video OK ? Replace MAIN B’D IC 100...

  • Page 60: Analog Tv

    Making 2009. 2 . 1 Analog TV No Audio Problem LCD TV Symptom 20/34 Revision 26~42LH2000 32~47LH3000/LH4000 Analog TV Video OK ? Check MAIN B’D Replace MAIN B’D IC100 C231 Signal (SIF) MAIN B’D TU1200 Replace MAIN B’D TU1200 Pin #17 Signal (SIF)

  • Page 61: Av / Component / Rgb, Hdmi-Pc/ Hdmi-Dtv 21~26

    Making 2009. 2 . 1 AV1 No Audio Problem LCD TV Symptom 21/34 Revision 26~42LH2000 32~47LH3000/LH4000 AV1 Video OK ? Check the SCART Cable Check MAIN B’D JK1100 Replace MAIN B’D JK1100 MAIN B’D C229 (Right Sound) Replace MAIN B’D IC 100 C230 (Left Sound) signal ? Check MAIN B’D...
  • Page 62 Making 2009. 2 . 1 AV2 No Audio Problem LCD TV Symptom 22/34 Revision 26~42LH2000 32~47LH3000/LH4000 AV2 Video OK ? Check the SCART Cable Check MAIN B’D JK1101 Replace MAIN B’D JK1101 MAIN B’D C2008 (Right Sound) Replace MAIN B’D IC 100 C2009 (Left Sound) signal ? Check MAIN B’D...
  • Page 63 Making 2009. 2 . 1 AV3 No Audio Problem LCD TV Symptom 23/34 Revision 26~42LH2000 32~47LH3000/LH4000 AV3 Video OK ? Check the CVBS Cable Check MAIN B’D JK402 Replace MAIN B’D JK402 MAIN B’D C2011 (Right Sound) Replace MAIN B’D IC 100 C2012 (Left Sound) signal ? Check MAIN B’D...
  • Page 64 Making 2009. 2 . 1 Component No Audio Problem LCD TV Symptom 24/34 Revision 26~42LH2000 32~47LH3000/LH4000 Component Video OK ? Check the CVBS Cable Check MAIN B’D JK400 Replace MAIN B’D JK400 MAIN B’D C2013 (Right Sound) Replace MAIN B’D IC 100 C2014 (Left Sound) signal ? Check MAIN B’D...
  • Page 65 Making 2009. 2 . 1 RGB, HDMI-PC No Audio Problem LCD TV Symptom 25/34 Revision 26~42LH2000 32~47LH3000/LH4000 RGB Video OK ? Check the PC Audio Cable Check MAIN B’D JK401 Replace MAIN B’D JK401 MAIN B’D C2015 (Right Sound) Replace MAIN B’D IC 100 C2016 (Left Sound) signal ? Check MAIN B’D...
  • Page 66 Making 2009. 2 . 1 HDMI-DTV No Audio Problem LCD TV Symptom 26/34 Revision 26~42LH2000 32~47LH3000/LH4000 HDMI Video OK ? Check the ADJUST MENU Download EDID EDID OK ? (Refer to Adjustment Spec) Replace MAIN B’D IC100 Check the HDMI Cable...

  • Page 67: Spdif) 27~30

    Making 2009. 2 . 1 AV1 No Audio Out Problem LCD TV Symptom 27/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check the Trouble Shooting Guide Analog TV Audio OK Analog TV No video Check the SCART Cable Check MAIN B’D JK1100 Replace MAIN B’D JK1100 MAIN B’D R239 (Right Sound) Replace MAIN B’D IC 100...
  • Page 68 Making 2009. 2 . 1 AV2 No Audio Out Problem LCD TV Symptom 28/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check the Trouble Shooting Guide Speaker Audio OK Related to Audio Problem Check the SCART Cable Check MAIN B’D JK1101 Replace MAIN B’D JK1101 MAIN B’D R250 (Right Sound) Replace MAIN B’D IC 100...
  • Page 69 Making 2009. 2 . 1 Headphone No Audio Problem LCD TV Symptom 29/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check the Trouble Shooting Guide Speaker Audio OK Related to Audio Problem Check the Headphone Cable Check MAIN B’D JK700 or JK701 Replace MAIN B’D JK700 or JK701 MAIN B’D R237 (Right Sound) Replace MAIN B’D IC 100...
  • Page 70 Making 2009. 2 . 1 SPDIF No Audio Problem LCD TV Symptom 30/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check the Trouble Shooting Guide Speaker Audio OK Related to Audio Problem Check the SPDIF Cable Check MAIN B’D JK403 Replace MAIN B’D JK403 Check MAIN B’D R230 PWM Signal ? Replace MAIN B’D IC 100...

  • Page 71: Usb No Connect / Remocon 31~33

    Making 2009. 2 . 1 USB No Connect Problem LCD TV Symptom 31/34 Revision 32~47LH4000 Check that the USB Memory & HDD are supported by Spec (Refer to User Manual’s USB cautions) Check MAIN B’D Replace MAIN B’D JK405 JK405 OK ? Check MAIN B’D Replace MAIN B’D IC 100 JK405 Pin #1 5V ?
  • Page 72 Making 2009. 2 . 1 Remote Control Problem LCD TV Symptom 32/34 Revision 26~42LH2000 32~47LH3000/LH4000 Check MAIN B’D P1304 Replace it Wafer & Connector Check IR B’D P1 Wafer Replace IR B’D & Connector...
  • Page 73 Making 2009. 2 . 1 Remote Control Problem LCD TV Symptom 33/34 Revision 19~22LH2000 Check MAIN B’D P1305 Replace it Wafer & Connector IR B’D IC1 Pin #3 Replace IR B’D IC1 Replace MAIN B’D IC100 Voltage 4V Check IR B’D P1 Wafer Replace MAIN B’D IC100 &...

  • Page 74: Intelligent Sensor

    Making 2009. 2 . 1 Intelligent Sensor Problem LCD TV Symptom 34/34 Revision 32~47LH4000 Check MAIN B’D P1304 Replace it Wafer & Connector Check IR B’D P1 Wafer Replace IR B’D & Connector...

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