LG 42LG30 Service Manual
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LG 42LG30 Service Manual

LG 42LG30 Service Manual

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LCD TV

SERVICE MANUAL

CHASSIS : LA85D
MODEL : 42LG30
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
North/Latin America
Europe/Africa
Asia/Oceania
42LG30-UD
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com

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Summary of Contents for LG 42LG30

  • 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 : LA85D MODEL : 42LG30 42LG30-UD CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ..............9 TROUBLE SHOOTING ................15 BLOCK DIAGRAM...................24 EXPLODED VIEW .................. 28 SVC. SHEET ....................- 2 - Copyright LG Electronics. Inc. All right reserved. 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 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 - 4 - Copyright LG Electronics. Inc. All right reserved. 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. - 5 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 6: Specification

    2) Humidity : ~ 80 % Storage Environment 1) Temp : -20 ~ 60 deg 2) Humidity : 0 ~ 85 % - 6 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 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 - 7 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 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 - 8 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Adjustment Instruction

    5. 2HOUR OFF : ON 6. OAD 7. UART DOWNLOAD 8. FACTORY MODE : ON 9. DEBUG MODE : OFF - 9 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 5. 2HOUR OFF : ON 6. OAD 7. UART DOWNLOAD 8. FACTORY MODE : ON 9. DEBUG MODE : OFF - 10 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 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 - 11 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: White Balance

    Gains at 192 and control the other two by reducing them wb 00 ff : End of white balance adjustment from 192. - 12 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Adjustment Of White Balance

    192. 7) The adjustment is done at three white balances of Cool, Medium and Warm. - 13 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 GND - Resisting pressure test = between Power cord GND and Live & Neutral (4) LEAKAGE CURRENT: Set to 0.5mArms - 14 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Troubleshooting

    Replace IC704 & Check IC704 #2 Pin Recheck Voltage Level 2.6V Check X100 Clock Replace X100 12MHz Replace IC103 Flash Memory - 15 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 Check Demodulator Input Clock Replace it X400 X400 (25MHz) Check IC400(LGDT) Output Replace IC400 -. AR401, AR402 Replace Mstar(IC100) Check Mstar LVDS output - 16 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 Check other IC (ex : LGDT, NTP, I/O) Check IIC Line Check CVBS signal Replace Tuner(TU400) TU400 #16 Pin Replace Mstar(IC100) Check Mstar LVDS output - 17 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: Component Video

    C1708, C1709, C1710 C1711, C1712, C1713 Check signal IC903 output Replace IC903 R990, R991, R993 Replace Mstar(IC100) Check Mstar LVDS output - 18 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 Check other set. Check R/G/B signal If no problem, check signal line. R640, R641, R642 Replace Mstar(IC100) Check Mstar LVDS output - 19 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 C635 (Composite), C634 / C633 (S-Video) Check other set. (Rear) If no problem, check signal line. R615 (Composite) (Side) Replace Mstar(IC100) Check Mstar LVDS output - 20 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Replace the defective IC Power & I2C Signal (#5, #6) Check IC802 Clock Signal Replace IC802 Replace Mstar(IC100) #26, #27 - 21 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 Follow procedure digital TV video Check video output trouble shooting guide. Follow procedure All source audio trouble Replace Mstar IC shooting guide - 22 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: Hdmi Audio

    Replace it or re-download EDID data. Power & I2C Signal (#5, #6) Follow procedure All source audio trouble Replace Mstar IC shooting guide - 23 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Block Diagram

    BLOCK DIAGRAM - 24 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 - 25 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 - 26 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 - 27 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 28 - Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Schematic Diagram

    SCHEMATIC DIAGRAM Copyright 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 Copyright 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 Copyright 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 Copyright 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 Copyright 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 Copyright 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 Copyright 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 Copyright 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 Copyright 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 Copyright 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 May., 2008 P/NO : MFL41524414 Printed in Korea...

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42lg30-ud

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