LG 37LV370S Service Manual
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LG 37LV370S Service Manual

LG 37LV370S Service Manual

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LED LCD TV

SERVICE MANUAL

CHASSIS : LD12B
MODEL : 37LV370S
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67002312 (1103-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
37LV375G/S/W
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
37LV370S-ZB
37LV375G/S/W-ZC
Printed in Korea

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Summary of Contents for LG 37LV370S

  • Page 1: Service Manual

    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 : LD12B MODEL : 37LV370S 37LV370S-ZB MODEL : 37LV375G/S/W 37LV375G/S/W-ZC CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL67002312 (1103-REV00) Printed in Korea...
  • Page 2 SPECIFICATION ..................4 ADJUSTMENT INSTRUCTION ..............8 BLOCK DIAGRAM.................. 14 EXPLODED VIEW .................. 15 SCHEMATIC CIRCUIT DIAGRAM .............. Copyright © 2011 LG Electronics. Inc. All rights 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 © 2011 LG Electronics. Inc. All rights reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Specification

    1) Performance: LGE TV test method followed 2) Demanded other specification - Safety : CE, IEC specification - EMC :CE, IEC Copyright © 2011 LG Electronics. Inc. All rights reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 Antenna, AV1, AV2, AV3, Component, RGB, HDMI1, HDMI2, HDMI3, USB 12 USB (1EA) JPEG, MP3 For SVC (download) DivX HD Copyright © 2011 LG Electronics. Inc. All rights reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
  • Page 6 VESA(XGA) 1280*768 47.78 59.87 79.5 WXGA 1360*768 47.72 59.8 84.75 WXGA 1920*1080 66.587 59.93 138.625 WUXGA FHD model Copyright © 2011 LG Electronics. Inc. All rights reserved. - 6 - LGE Internal Use Only Only for training and service purposes...

  • Page 7: Hdmi Input

    48.363 60.00 65.00 VESA(XGA) HDCP 1360*768 47.72 59.8 84.75 WXGA HDCP 1920*1080 67.5 60.00 138.625 WUXGA HDCP/FHD model Copyright © 2011 LG Electronics. Inc. All rights reserved. - 7 - LGE Internal Use Only Only for training and service purposes...

  • Page 8: Adjustment Instruction

    - At success Download, check the OK(3) - Start CI+ Download, Push the (4) - Check the OK or NG.(5) Copyright © 2011 LG Electronics. Inc. All rights reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 Input the Factory model name(ex 42LD450-ZA) or Serial 0x03 25 number like photo. 0x04 6E 0x05 2D 0x06 51 ⓔ2 0x07 00 Copyright © 2011 LG Electronics. Inc. All rights reserved. - 9 - LGE Internal Use Only Only for training and service purposes...

  • Page 10: White Balance Adjustment

    1) Surrounding Temperature : 25 ºC ± 5 ºC 2) Warm-up time: About 5 Min 3) Surrounding Humidity : 20 % ~ 80 % Copyright © 2011 LG Electronics. Inc. All rights reserved. - 10 - LGE Internal Use Only...
  • Page 11 W/B Adj. must begin as start command “wb 00 00” , and finish as end command “wb 00 ff”, and Adj. offset if need. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 11 - LGE Internal Use Only...
  • Page 12 - Internal Pressure TEST = POWER CORD GND & LIVE & NEUTRAL • LEAKAGE CURRENT: At 0.5 mArms Copyright © 2011 LG Electronics. Inc. All rights reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 1) Push "IN-START" key in service remote control. 2) Select "Tool Option 1" and Push “OK” button. 3) Push in the number. (Each model has their number.) Copyright © 2011 LG Electronics. Inc. All rights reserved. - 13 - LGE Internal Use Only...

  • Page 14: Block Diagram

    BLOCK DIAGRAM Copyright © 2011 LG Electronics. Inc. All rights reserved. - 14 - LGE Internal Use Only Only for training and service purposes...

  • Page 15: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright LG Electronics. Inc. All rights reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN & NAND FLASH Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN POWER Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR MAIN AUDIO/VIDEO THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR MAIN DDR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR POWER THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MICOM Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR L_DIMMING THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 2010.11.11 BCM35230 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR NON CHB THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR LV7 HDMI THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LV7 COMM JACK Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LV7 ETHERNET Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR LV7 EU COMP/AV THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LV7 EU USB Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LV7 EU LVDS Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LV7 EU TUNER Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LV7 EU SCART Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LV7 EU AMP Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LV7 EU IR Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LV7 EU Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR SMD GASKET THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 Standard Repair Process Copyright ⓒ 2008 by LG Electronics. Inc. No part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without prior written permission of the publisher Copyright ©...
  • Page 40 Always check/record S/W Version and White Balance value before replacing the Main /Digital Re-enter White Balance value Replace Main Board Board Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 41 Normal voltages of Power No Video/ replace voltage? Board No audio MAIN B/D ( 5V,12V,24V…) Replace Power Board and repair parts Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 42 ※ Check expert mode with user remote controller Check and fix Normal Normal ANT signal screen? screen? (Request to cable/antenna provider) Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 43 Replace Main B/D External device Check external RGB/ Replace Main B/D /Cable device and HDMI/DVI normal cable error Color error? Replace module Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 44 Replace Main B/D replace Link normal? -RGB connection Cable -HDMI/DVI condition Replace Request module repair for Check Test mode external RGB screen device Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 45 (Check normal operation of Replace Main B/D normal? External Input, Component, HDMI/ RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 46 ※ For Pacific 2, operation display LED can be off even with ST-BY output of 3.5V → In this case, replace the Digital B/D instead of the Power Board Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl...
  • Page 47 Replace Main B/D voltage? Check Power B/D voltage ※ Caution Replace Power B/D Check and fix exterior of Power B/D/Part Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 48 Speaker off repair parts Board Check Input Signal Cancel OFF and describe Check Replace MAIN Board Disconnection Speaker disconnection Replace Speaker Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 49 Connect and check Normal signal error) other external audio? Check and fix device external device ☞169~171 Check and fix external device Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 50 Reset or replace length effect remote controller Replace Key PCB remote controller battery Request for florescent light replacement or attach mesh cloth Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 51 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote controller Replace remote controller damage Stand Replace stand dent Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 52 After turning on the power and disassembling the case, check with the naked eye, whether you can see light from 6 locations. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 LED Driver B+ 24V measuring method Content 2/33 - 1/13 date Measure the DC 24V supplied to LED Driver from the Power Board. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 24V is provided from the Power Board and supplied to LED Check each voltage output (5V,12V,24V) in the Power Board. Driver PCB. Check the PIN contact condition and connection. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 55 3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 56 Power Board voltage measuring method Content 5/33 - 2/13 date Check each voltage output (3.5V, 12V, 24V) supplied from Power Board to Main Board. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 57 TUNER input signal strength checking method Content 7/33 - 3/13 date Check MENU - SETUP - Support - Signal Test Check Signal Strength and Quality Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 58 * Press the Menu button on the remote remote controller for adjustment controller Enter Auto Channel Press the number button 1,1,1,1,1 HOST menu is displayed on the screen. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 59 1. Press the Menu button on the remote controller 2. Enter into Support -> Picture Test 3. The TV Display Test Image Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 60 Revised Content 9/33 - 4/13 Check Link Cable (LVDS) reconnection condition date Check the contact condition of the Link Cable Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 LCD TV connection diagram (09) Revised Content 12/33 - 5/13 date As the part connecting to the external input, check the screen condition by signal Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 62 1. Press the Menu button on the remote controller 2. Enter into Support -> Picture Test 3. The TV Display Test Image Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 63 Revised Content Check Link Cable (LVDS) reconnection condition 13/33 - 5/13 date Check the contact condition of the Link Cable Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 64 LCD TV symptom date Revised Check front display LED Content 15/33 - 6/13 date ST-BY condition: Red Power ON condition: Blue Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 65 2. Check the connected part with input from the POWER BOARD and whether the fuse is connected. 3. Check the ST-BY DC 3.5V output voltage from the POWER BOARD. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl...
  • Page 66 3. Check the AC-DET (AC) DC3.5V voltage on POWER BOARD. 4. Check the POWER ON High (About DC 1.8V or above) voltage with input from POWER BOARD. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl...
  • Page 67 24V is provided from the Power Board and supplied to LED Check each voltage output (5V,12V,24V) in the Power Board. Driver PCB. Check the PIN contact condition and connection. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...

  • Page 68: Entry Method

    Entry method 1. Press the IN-START button of the remote controller for adjustment 2. Check the entry into adjustment item 3 Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...
  • Page 69 POWER BOARD PIN voltage checking method Content 20/33 - 7/13 date Check the voltage when the Power OFF mode is not shown Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...

  • Page 70: Press The Menu Button On The Remote Controller

    1. Press the MENU button on the remote controller 2. Select the AUDIO function of the Menu 3. Select TV Speaker from Off to On Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...

  • Page 71: Table Of Contents

    1. Press the Menu button on the remote controller 2. Enter into Support -> Sound Test 3. The TV Play the Test Music Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...

  • Page 72: Date

    ③ Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal, the speaker is normal. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl...
  • Page 73 ③ Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal, the speaker is normal. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl...
  • Page 74 Analog Tester needle moves slowly, and defective when it does not move at all. Input voltage terminal: 3.5V_ST (Pin 6) Remote controller receiver terminal: IR (Pin 9) Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Onl Only for training and service purposes...

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