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LG 42LM3700 Service Manual

Chassis la21b
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LED LCD TV
SERVICE MANUAL
CHASSIS : LA21B
MODEL : 42LM3700
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67402845 (1208-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42LM3700-UC
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 42LM3700

  • Page 1 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 : LA21B MODEL : 42LM3700 42LM3700-UC CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL67402845 (1208-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    ADJUSTMENT INSTRUCTION ..............9 TROUBLE SHOOTING ................15 BLOCK DIAGRAM .................. 23 EXPLODED VIEW .................. 24 SCHEMATIC CIRCUIT DIAGRAM .............. - 2 - Copyright © LG Electronics. Inc. All rights reserved. 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. - 3 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 4: Specification

    2) Humidity : ~ 80 % Storage 1) Temp : -20 ~ 60 deg Environment 2) Humidity : ~ 85 % - 4 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 1152*864 54.348 60.053 VESA 1360*768 47.712 60.015 85.50 VESA (WXGA) 1920*1080 66.587 59.934 138.5 WUXGA Full HD model Only - 5 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 HDTV 1080P 1920*1080 26.97 23.976 74.176 HDTV 1080P 1920*1080 33.75 30.00 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 Side by Side, Top & Bottom 1920*1080 67.50 60.00 148.5 HDTV 1080P Side by Side, Top & Bottom, Single Frame Sequential - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 8.7. DLNA Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark 1920*1080 33.75 74.25 HDTV 1080P Side by Side, Top & Bottom - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Adjustment Instruction

    (1) Shipment conditions (2) Tool option menu (3) USB Download (S/W Update, Option and Service only) (4) Preset CH Information - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 60 | 3E 1E 53 10 00 0A 20 20 20 20 20 20 00 00 00 FC 70 | 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 00 02 - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 Color Analyzer Probe RS-232C Computer RS-232C RS-232C ※ Pattern Generator Signal Source ※If TV internal pattern is used, not needed - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 Coordinate Mode Temp △uv Cool 0.269±0.002 0.273±0.002 13,000K 0.0000 Medium 0.285±0.002 0.293±0.002 9,300K 0.0000 Warm 0.313±0.002 0.329±0.002 6,500K 0.0000 - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 - GND Test = POWER CORD GND and SIGNAL CABLE GND. - Hi-pot Test = POWER CORD GND and LIVE & NEUTRAL. (4) LEAKAGE CURRENT: At 0.5mArms - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 (2) Select "Tool Option 1" and Push “OK” button. (3) Punch in the number. (Each model has their number.) - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Trouble Shooting

    Check Inverter Control & Error Out Check Power Board or Module P403 18 pin : High P403 24 pin : low Change Module - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 Check CVBS Signal Bad Tuner. Replace Tuner. TU3704 8 Pin Check Mstar LVDS Output Replace Mstar(IC101) or Main Board. - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 Y/PB/PR signal Line Check COMP_DET Signal Replace R1612 or R1613 Check Mstar LVDS Output Replace Mstar(IC101) or Main Board. - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 Replace Jack H/V_Sync/R/G/B Signal Line Check DSUB_DET Replace R1146 or R1147 Check Mstar LVDS Output Replace Mstar(IC101) or Main Board. - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 Check HDMI Signal Replace Main Board If no problem, check signal line Check Mstar LVDS Output Replace Mstar(IC101) or Main Board. - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 Replace connector Check Connector & P501 if found to be damaged. Check speaker resistance Replace speaker. and connector damage. - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Check CVBS Signal Bad Tuner. Replace Tuner. TU3700 8 Pin Follow procedure ‘8. All source audio’ trouble shooting guide. - 21 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 Check JK1102 & Signal Line Replace Jack Follow procedure ‘8. All source audio’ trouble shooting guide. - 22 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: Block Diagram

    BLOCK DIAGRAM - 23 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 24 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 2011.11.16 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. FLASH/EEPROM/GPIO Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 26 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. POWER,IN/OUT,H/W OPT Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 27 2011.07.07 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. TP_NON_EN Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 28 2011/11.14 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR POWER_LARGE THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 29 2011/11/16 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR IR/CONTROL THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 30 10/08/13 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR USB_OCP_DIODE THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 31 2011.10.04 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. HDMI Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 32 2011/09/27 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR RGB-PC/SPDIF THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 33 2011/08/13 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR RS232C_PHONE THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 34 2011/11/14 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR LVDS_LARGE THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 35 2011/06/03 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR DDR_256 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 36 2011.10.11 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR TUNER_NON_EU THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 37 2011/10/04 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR HEADPHONE THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 38 2011.10.04 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. NTP-7500 Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 39 2011.11.02 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. REAR_NON_EU_L Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 40 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR ETHERNET THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 41 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Serial FLASH Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 42 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR MSTAR DEBUG_4PIN THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

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42lm3700-uc