LG 55LH55 Service Manual
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LG 55LH55 Service Manual

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See also: Owner's Manual
LCD TV

SERVICE MANUAL

CHASSIS : LA92B
MODEL : 55LH55
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL58436010 (0904-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
55LH55-UA
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 55LH55

  • 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 LCD TV SERVICE MANUAL CHASSIS : LA92B MODEL : 55LH55 55LH55-UA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL58436010 (0904-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ...............14 TROUBLE SHOOTING ................18 BLOCK DIAGRAM...................29 EXPLODED VIEW .................. 34 SVC. SHEET ....................Copyright 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 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 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. Copyright LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Specification

    Input Voltage AC100 ~240V,50/60Hz Tuning system 4.2 EyeQ-Green Motion Characters. Ambient Calculative Sensor Backlight UI Contrast Brightness Sharpness Color Illumination Illumination Copyright LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 Audio Bit Resolution 32,40,48,56,64,80,96,112,128,160, Kbps 192,224,256,320,384,448,512,576,640 VSB RF Input 75Ω unbalanced, F type Connector input Sync Stable Time Under 3.0 <None>SEC Copyright LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 1) Impress 100%(255Gray Level) full white pattern at the same peak brightness measurement. 2) Measure average brightness in 5 points. Copyright LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 HDTV 1080P 1920*1080 26.97 23.94 74.176 HDTV 1080P 1920*1080 33.75 30.000 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P Copyright LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 HDTV 1080P 1920*1080 26.97 23.94 74.176 HDTV 1080P 1920*1080 33.75 30.000 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P Copyright LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 EDID Block 0, Bytes 0-127 [00H-7FH] Block Type: EDID 1.3 EDID Block 1, Bytes 128-255 [80H-FFH] Block Type: CEA EDID Timing Extension Version3 Copyright LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 EDID Block 0, Bytes 0-127 [00H-7FH] Block Type: EDID 1.3 EDID Block 1, Bytes 128-255 [80H-FFH] Block Type: CEA EDID Timing Extension Version3 Copyright LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 20.0 21.0 Lips 20 11.0 12.0 13.0 Inside Temp.Under 20deg. No operation AC Power Shut Down Voltage Wide Range PSU Copyright LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...

  • Page 14: Adjustment Instruction

    But your downloaded version is High, USB data is automatically detecting 3. Show the message “Copying files from memory” Copyright LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 In-Start Menu 1. Adjust Check. * After Board level adjustment, set volume setting value 0 Copyright LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 00 1f -> Gain adj. complete *(wb 00 20(Start), wb 00 2f(End)) -> Off-set adjustment wb 00 ff -> End white balance auto-adjustment Copyright LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 < step 2> < step 3> < step 4> Green Eye-Check Sensor Data: Backli ght : < step 5> < step 6> Copyright LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...

  • Page 18: Trouble Shooting

    VIDEO TROUBLESHOOTING • VIDEO PATH Half-NIM Tuner Copyright LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 Ex2) A phenomenon of moment flicker a specia lly bright area after changing channel or input mode CATV-3 CATV-2 CATV-3 <After changing channel> <Before changing channel> Copyright LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
  • Page 20 After checking thoroughly all path once again, You should decide to replace LGE7329. Although you replace it, you cannot see normal display, decide to replace Main chip(LGE3159) Copyright LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...
  • Page 21 After checking thoroughly all path once again, You should decide to replace LGE7329. Although you replace it, you cannot see normal display, decide to replace Main chip(LGE3159) Copyright LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 After checking thoroughly all path once again, You should decide to replace LGE7329. Although you replace it, you cannot see normal display, decide to replace Main chip(LGE3159) Copyright LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...
  • Page 23 After checking thoroughly all path once again, You should decide to replace LGE7329. Although you replace it, you cannot see normal display, decide to replace Main chip(LGE3159) Copyright LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...

  • Page 24: Audio Troubleshooting

    AUDIO TROUBLESHOOTING • AUDIO PATH Copyright LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...
  • Page 25 Can you see the normal waveform? After checking audio signal line, Check IC600(NTP-3100L) L606/L607 you should decide to replace item or not. Copyright LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...
  • Page 26 After checking the Power & Select Pin & Etc of this chip Check IC600(NTP-3100L) L606/L607 y ou should decide to replace this or not. Copyright LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...
  • Page 27 After checking audio signal line, Check IC600(NTP-3100L) L606/L607 you should decide to replace item or not. Check the connector & Speaker Copyright LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...
  • Page 28 After checking the Jack, you should decide to replace item or not. Copyright LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...

  • Page 29: Block Diagram

    BLOCK DIAGRAM Half-NIM Tuner Copyright LG Electronics. Inc. All right reserved. - 29 - LGE Internal Use Only Only for training and service purposes...
  • Page 30 I2C Map Copyright LG Electronics. Inc. All right reserved. - 30 - LGE Internal Use Only Only for training and service purposes...

  • Page 31: Power Management

    POWER MANAGEMENT L1200 L1209 L1201 L703 Copyright LG Electronics. Inc. All right reserved. - 31 - LGE Internal Use Only Only for training and service purposes...
  • Page 32 MAIN IC => POWER MANAGEMENT Copyright LG Electronics. Inc. All right reserved. - 32 - LGE Internal Use Only Only for training and service purposes...
  • Page 33 MAIN IC => POWER MANAGEMENT Copyright LG Electronics. Inc. All right reserved. - 33 - LGE Internal Use Only Only for training and service purposes...

  • Page 34: 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. - 34 - LGE Internal Use Only Only for training and service purposes...

  • Page 35: Schematic Diagram

    SCHEMATIC DIAGRAM MAIN IC Copyright 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 IN / OUT F i b e r O p t i c Copyright 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 HDMI Copyright 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 AUDI Copyright 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 POWER Copyright 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 40 TUNER Copyright 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 DDR2 Copyright 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 42 LVDS/ FRC Copyright 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 FRC DDR Copyright 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 44 ETC SUB BOARD I /F USB DOWN STREAM Copyright 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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