LG 37LG3000 Service Manual
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LG 37LG3000 Service Manual

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LCD TV

SERVICE MANUAL

CHASSIS : LD84A
MODEL : 37LG3000
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Internal Use Only
website:http://biz.LGservice.com
37LG3000-ZA

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  • Page 1: Service Manual

    Internal Use Only website:http://biz.LGservice.com LCD TV SERVICE MANUAL CHASSIS : LD84A MODEL : 37LG3000 37LG3000-ZA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ...............13 TROUBLE SHOOTING ................18 BLOCK DIAGRAM...................23 EXPLODED VIEW .................. 24 SVC. SHEET ....................Copyright © 2007 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 © 2007 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 © 2007 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 © 2007 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Specification

    Back Light 37" 16 Lamp EEFL LG3000 42" 18pcs, Straight type Display Colors 16.7M (16,777,216) Coating 3H, AG Copyright © 2007 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 SPDIF out Earphone out (1EA) Antenna, AV1, AV2, AV3, Component, RGB, HDMI1, HDMI2, HDMI3 USB (1EA) For service only Copyright © 2007 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 3) The values specified are at approximate distance 40Cm from the LCD surface 4) Ta= 25°C, Vcc=12.0V, VIVN=24.0Hz, VBRT=3.3V, Timing:60Hz(typ.value) 5) Measurement condition : Set the value of VBRT to maximum luminance of white. Copyright © 2007 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only...
  • Page 9 84.75 WXGA 1280*1024 63.595 60.0 108.875 SXGA FHD Model only 1920*1080 66.647 59.988 138.625 WUXGA FHD Model only Copyright © 2007 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 1280*1024 63.595 60.0 108.875 SXGA FHD Model only, HDCP 1920*1080 66.647 59.988 138.625 WUXGA FHD Model only, HDCP Copyright © 2007 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 Dimension Before Packing 1032.8 293.8 742.3 With Stant After Packing 1330 Product Only SET 23.6 With BOX 28.5 Copyright © 2007 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...

  • Page 12: Adjustment Instruction

    If display "Can’t ", Check connect computer, jig, and set. (2) OK Controllare la frequenza: Usare una frequenza da 200KHz a 400KHz Copyright © 2007 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 2. Select "Tool Option 1" and Push "OK" button 3. Punch in the number. (Each model has their number.) 4. Completed selecting Tool option Copyright © 2007 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only...
  • Page 14 - Enter White Pattern off of service mode, and change off -> on. - Enter "W/B ADJUST" by pushing " " key at "3. W/B ADJUST". Impress Resolution 1080i Copyright © 2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only...
  • Page 15 - Write Serial number by use RS-232. - Must check the serial number at the Diagnostics of SET UP menu. (Refer to below). Copyright © 2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 60 26 36 80 A0 70 38 1F 40 30 20 25 00 C4 8E 21 00 70 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 00 17 Copyright © 2007 LG Electronics. Inc. All right reserved. - 16 -...
  • Page 17 - For the LCD, make sure that the back light is turned on by using no signal and the full white pattern or others. Copyright © 2007 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only...
  • Page 18 - Resisting pressure TEST = between POWER CORD volume +/- key to adjust GND and LIVE & NEUTRAL O LEAKAGE CURRENT: Set to 0.5mArms Copyright © 2007 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 - Check: blank - PORT: Select the Parallel Port to use (LPT1 in general) *caution: Select the EPP as LPT from the ROM BIAS setting. Copyright © 2007 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only...
  • Page 20 Stick from the USB jack. 6) Press the IN-START button of the remote controller to check the upgraded S/W version. Copyright © 2007 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...

  • Page 21: Troubleshooting

    Main IC(IC100) have some troubles. After checking thoroughly all path once again, You should decide to replace Main Board or not. Copyright © 2007 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 Main IC(IC100) have some troubles. After checking thoroughly all path once again, You should decide to replace Main Board or not. Copyright © 2007 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...
  • Page 23 Main IC(IC100) have some troubles. After checking thoroughly all path once again, You should decide to replace Main Board or not. Copyright © 2007 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...
  • Page 24 Main IC(IC100) have some troubles. After checking thoroughly all path once again, You should decide to replace Main Board or not. Copyright © 2007 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...
  • Page 25 Main IC(IC100) have some troubles. After checking thoroughly all path once again, You should decide to replace Main Board or not. Copyright © 2007 LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...

  • Page 26: Hdmi Doesn T Display

    Main IC(IC100) have some troubles. After checking thoroughly all path once again, You should decide to replace Main Board or not. Copyright © 2007 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...

  • Page 27: Block Diagram

    BLOCK DIAGRAM PCM_CD_ON TS_Parallel PCM_ADD PCM_DATA TS_Serial SPDIF Out Head phone Out Side_Y/C/V/L/R TV Tuner Copyright © 2007 LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...

  • Page 28: Exploded View

    EXPLODED VIEW - 28 - Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 Feb., 2008 P/NO : MFL41037108 Printed in Korea...

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