LG 42SL90QD Service Manual
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LG 42SL90QD Service Manual

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See also: Owner's Manual
LED LCD TV

SERVICE MANUAL

CHASSIS : LB91L
MODEL : 42SL90QD
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL60020331 (0909-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42SL90QD-AA
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

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Summary of Contents for LG 42SL90QD

  • Page 1: Service Manual

    Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LED LCD TV SERVICE MANUAL CHASSIS : LB91L MODEL : 42SL90QD 42SL90QD-AA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL60020331 (0909-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    PRODUCT SAFETY ................. 3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ..............9 BLOCK DIAGRAM.................. 13 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: Safety Precautions

    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: Servicing Precautions

    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

    973.2 (H)x 566.2 (V)x 11.9(B)/25.5 mm(D) Pixel Pitch 0.4845 (H)x 0.4845 (V) Back Light Color Depth 1.06B Colors (10bit) Coating Copyright © 2009 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 33.75 60.00 HDTV 1080i 1920x1080 33.72 59.94 HDTV 1080i 1920x1080 56.250 HDTV 1080p 1920x1080 67.43/67.5 59.94/60 HDTV 1080p Copyright © 2009 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 1024*768 48.363 60.00 1280*768 47.78 59.87 1360*768 47.72 59.8 1280*1024 63.595 60.00 1920*1080 66.587 59.93 1366*768 47.13 59.65 Copyright © 2009 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...

  • Page 9: Adjustment Instruction

    If “Error” is displayed, Check connection between computer, jig, and set. 3) Click “Read” tab, and then load download file (XXXX.bin) by clicking “Read”. Copyright © 2009 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 * Display and Sound check is executed by Remote control. * Caution : Not to push the INSTOP key after completion if the function inspection. Copyright © 2009 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only...
  • 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: Auto Download

    MODEL NAME(HEX) - Analog EDID : Pin3 exists 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 (LG TV) - Digital EDID : Pin3 exists • Never connect HDMI & D-sub Cable at the same time.

  • Page 13: Block Diagram

    BLOCK DIAGRAM 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 2009.05.28 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN_1 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 16 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN_2 MAIN_2 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 17 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. DDR2 DDR2 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 18 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. INTERFACE NTERFACE Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 19 EAX61110501(6)[SL80] 2009.05.28 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 20 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. HDMI HDMI Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 21 2009.05.28 EAX61110501(6)[SL80] ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 22 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. POWER POWER Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 23 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MST7323S(FRC) MAIN Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 24 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MST7323S DDR2 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 25 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. TUNER 11_TUNER Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 27 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 28 Board ( 5V,12V,20V No audio No audio MAIN B/D MAIN B/D or 24V…) Replace Power Board and repair parts Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 29 Contact with signal distributor Normal or broadcaster (Cable or Air) Picture? Check Normal Tuner soldering Picture? Close Replace Main B/D Close Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 30 Request repair for external device/cable RGB/ Check external External device device and Replace Main B/D HDMI/DVI /Cable error cable normal Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 31 (Check normal operation of Main B/D normal? External Input, Component, HDMI/ RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 32 If mechanical power switch off → Doesn’t turn on by remote control → Doesn’t appear LED light Please refer to the A21 Page Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 33 Power off by unknown status except listed case "POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble Abnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 34 Cancel OFF and describe Replace Power Board and repair parts Check Replace MAIN Board Disconnection Speaker disconnection Replace Speaker Replace Speaker Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 35 External Input Connect and check Normal signal error) other external audio? Check and fix device external device Check and fix external device Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 36 Output signal Signal? Connector solder (Key PCB + tool ) Close Close Repair/Replace Move Move Local switch B/D Power problem Section Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 37 RGB,HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical ith t information Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 38 ※ Describe the basis of the description (For models without any fix information, in “Part related to nose” in the Owner’s provide the description) Manual. Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 39 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote controller Replace remote controller damage Stand Replace stand dent Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 40 USB / Remocon Problem USB no connect / Remocon USB no connect / Remocon 31 33 31~33 Intelligent Sensor Intelligent Sensor Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 41 Replace MAIN B’D IC102 Replace MAIN B’D IC103 Replace MAIN B’D Replace MAIN B’D IC100 NAND FLASH Serial Flash IC300, IC301 DDR2 Memory Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 42 MAIN B’D L810 = 12V ? Replace MAIN B’D Q805 Check LVDS Cable Replace Main Board OK ? Replace LVDS Cable Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 43 Replace MAIN B’D IC1103 MAIN B’D L1113 = 1.8V ? Replace MAIN B’D IC1105 MAIN B’D X1101 Clock ? Replace MAIN B’D X1101 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 44 Replace MAIN B’D IC1103 MAIN B’D L1113 = 1.8V ? Replace MAIN B’D IC1105 MAIN B’D X1101 Clock ? Replace MAIN B’D X1101 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 45 Replace MAIN B’D JK402 Video Signal ? Check MAIN B’D C217 Replace Video Signal ? MAIN B’D C217 Replace MAIN B’D IC 100 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 46 Replace MAIN B’D JK404 Video Signal ? Check MAIN B’D C211 Replace Video Signal ? MAIN B’D C211 Replace MAIN B’D IC 100 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 47 C202 (Pr) MAIN B’D C200 or C203 or C201 or C202 Video Signal ? Video Signal ? Replace MAIN B’D IC 100 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 48 C216 (Pr) MAIN B’D C214 or C209 or C215 or C216 Video Signal ? Video Signal ? Replace MAIN B’D IC 100 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 49 MAIN B’D C207 (Vid Replace R2030 (HSYNC) MAIN B’D C207 or R2030 or R2031 R2031 (VSYNC) Replace MAIN B’D IC 100 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 50 C2017 (GREEN) C2017 (GREEN) Replace C2018 (BLUE) MAIN B’D C2016 or C2017 or C2018 Video Signal ? Replace MAIN B’D IC 100 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 51 Adj t EDID OK ? Replace MAIN B’D IC601 (HDCP KEY) Replace MAIN B’D IC 100 Replace MAIN B D IC 100 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 52 MAIN B’D JACK Check JK600 -> HDMI1 JK601 > HDMI2 JK601 -> HDMI2 JK602 -> HDMI3 JK603 -> HDMI4 Replace MAIN B’D IC 100 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 53 L705 Pin #1 Check P700 Cable Replace MAIN B’D IC701 L704 Pin #2 PWM Signal ? Replace MAIN B’D IC 701 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 54 LCD TV Digital TV No Audio Problem Symptom 14/25 Revision Revision Digital TV Video OK ? Replace MAIN B’D IC 100 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 55 Analog TV Video OK ? Check MAIN B’D Replace MAIN B’D IC100 R2046 Signal (SIF) MAIN B’D Replace MAIN B’D IC1102 L1101 Signal (SIF) Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 56 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 C229, C230 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 57 Replace MAIN B’D JK402 MAIN B’D C2008 (Right Sound) Replace MAIN B’D IC 100 C2009 (Left Sound) signal ? Check MAIN B’D C2008, C2009 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 58 Replace MAIN B’D JK402 MAIN B’D C229 (Right Sound) Replace MAIN B’D IC 100 C230 (Left Sound) signal ? Check MAIN B’D C229, C230 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 59 Replace MAIN B’D JK402 MAIN B’D C2013 (Right Sound) Replace MAIN B’D IC 100 C2014 (Left Sound) signal ? Check MAIN B’D C2013, C2014 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 60 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 C2015, C2016 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 61 Check the ADJUST MENU Download EDID EDID OK ? (Refer to Adjustment Spec) Replace MAIN B’D IC100 Check the HDMI Cable Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 62 Check the SPDIF Cable Check MAIN B’D JK403 Replace MAIN B’D JK403 Check MAIN B’D R2305 PWM Signal ? Replace MAIN B’D IC 100 Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 63 JK406 Pin #1 5V ? Check MAIN B’D Replace MAIN B’D IC808 R826 5V ? Check MAIN B’D Replace POWER B’D R848 12V ? Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 64 Check MAIN B’D P5001 Check MAIN B D P5001 Replace it Wafer & Connector Check IR B’D P1 Wafer Replace IR B’D & Connector Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 65 Check MAIN B D P5001 Replace it Wafer & Connector Check IR B’D P1 Wafer Replace IR B’D & Connector & Connector Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

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