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LG 52LG50FD Service Manual
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LG 52LG50FD Service Manual

LG 52LG50FD Service Manual

Chassis : lj82b
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See also: Owner's Manual
LCD TV
SERVICE MANUAL
CHASSIS : LJ82B
MODEL : 52LG50FD
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Internal Use Only
website:http://biz.LGservice.com
52LG50FD-SA

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Summary of Contents for LG 52LG50FD

  • Page 1 Internal Use Only website:http://biz.LGservice.com LCD TV SERVICE MANUAL CHASSIS : LJ82B MODEL : 52LG50FD 52LG50FD-SA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION..............11 TROUBLE SHOOTING ................21 BLOCK DIAGRAM...................49 EXPLODED VIEW .................. 50 SVC. SHEET ....................Copyright 2008 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 2008 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...
  • Page 4 Copyright 2008 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 2008 LG Electronics. Inc. All right reserved. - 5 - 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 : ~ 85 % Copyright 2008 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 Standard 9300 Warm 6500 Color Distortion, DG 10.0 Color Distortion, DP 10.0 Color S/N, AM/FM 43.0 Color Killer Sensitivity Copyright 2008 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 Standard 9300 Warm 6500 Color Distortion, DG 10.0 Color Distortion, DP 10.0 Color S/N, AM/FM 43.0 Color Killer Sensitivity Copyright 2008 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 60.020 108.00 VESA (SXGA) 1280*1024 79.976 75.025 VESA (SXGA) 1600*1200 75.00 60.00 VESA (UXGA) 1920*1080 67.5 138.5 HDTV 1080P Copyright 2008 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P 1920*1080 56.25 50.000 148.5 HDTV 1080P 1920*1080 28.125 25.000 74.25 HDTV 1080P Copyright 2008 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...

  • Page 11: Adjustment Instruction

    – 13Ch, or Cross hatch pattern – 09Ch) then it can appear image stick near black level Copyright 2008 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 3.3 << 10P WAFER >> PIN MAP Copyright 2008 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 Copyright 2008 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
  • Page 14 Copyright 2008 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 Copyright 2008 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 - ad 00 10: Adjust 1080p Comp1/RGB(Change the mode just a second. and adjustment action) - ad 00 90: End of the adjustment Copyright 2008 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 - It will operate in the DOS mode LCD TV SET (or Digital Board) Pic.3) For write EDID data, setting Jig and another instruments. Copyright 2008 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 BC See Working Guide if you want more information about EDID communication. Copyright 2008 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 O Using CS-210 Equipment. (9 CH) • Contrast value: 216 Gray COOL CA-210 0.276±0.002 0.283±0.002 MEDIUM CA-210 0.285±0.002 0.293±0.002 WARM CA-210 0.313±0.002 0.329±0.002 Copyright 2008 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
  • Page 20 6.3 Temperature Threshold • Threshold Down Low 20 • Threshold Up Low • Threshold Down High 70 • Threshold Up High Copyright 2008 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...

  • Page 21: Troubleshooting

    TROUBLESHOOTING Copyright 2008 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 Voltage Level 1.2V Check X200 Clock Replace X200 54MHz Check R154 Clock Maybe BCM3553 has troubles. 33MHz Replace IC101 Flash Memory Copyright 2008 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...
  • Page 23 Copyright 2008 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...
  • Page 24 Maybe BCM3553 has problems #33(TXAC-) , #32(TXAC+) , #17(TXBC-) , #16(TXBC+) Replace Cable Check LVDS Cable Check PDP/LCD Module Control board Copyright 2008 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...
  • Page 25 Copyright 2008 LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...
  • Page 26 Redownload PLD file or replace R1102 (Typ. 74.25MHz), R1100, R1101 Check BCM7412 Input Clock Replace it R107 (27MHz) Maybe BCM3553(IC100) has problems Copyright 2008 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...
  • Page 27 Copyright 2008 LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...
  • Page 28 Replace IC808 or check L800 5V Check CVBS signal power IC808 #8 Pin Check CVBS signal Replace it C658 Maybe BCM3553(IC100) has problems Copyright 2008 LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...
  • Page 29 Copyright 2008 LG Electronics. Inc. All right reserved. - 29 - LGE Internal Use Only Only for training and service purposes...
  • Page 30 L700, L701. L702 / L704, L705, L706 Check signal Replace it C638, C639, C640 / C628, C629, C630 Maybe BCM3553(IC100) has problems Copyright 2008 LG Electronics. Inc. All right reserved. - 30 - LGE Internal Use Only Only for training and service purposes...
  • Page 31 Copyright 2008 LG Electronics. Inc. All right reserved. - 31 - LGE Internal Use Only Only for training and service purposes...
  • Page 32 Replace L708 / Q701 / Q702 / Q703 Check L708 Voltage Level 9V Check Signal Replace it C635, C636, C637 Maybe BCM3553(IC100) has problems Copyright 2008 LG Electronics. Inc. All right reserved. - 32 - LGE Internal Use Only Only for training and service purposes...
  • Page 33 Copyright 2008 LG Electronics. Inc. All right reserved. - 33 - LGE Internal Use Only Only for training and service purposes...
  • Page 34 C651 (Composite), C648 / C649 (S-Video) (Rear) Replace it C652 (Composite), C659 / C660 (S-Video) (Rear) Maybe BCM3553(IC100) has problems Copyright 2008 LG Electronics. Inc. All right reserved. - 34 - LGE Internal Use Only Only for training and service purposes...
  • Page 35 Copyright 2008 LG Electronics. Inc. All right reserved. - 35 - LGE Internal Use Only Only for training and service purposes...
  • Page 36 Replace it Power & I2C Signal (#5, #6) Check IC601 Clock Signal Replace it Maybe BCM3553(IC100) has problems #26, #27 Copyright 2008 LG Electronics. Inc. All right reserved. - 36 - LGE Internal Use Only Only for training and service purposes...
  • Page 37 Copyright 2008 LG Electronics. Inc. All right reserved. - 37 - LGE Internal Use Only Only for training and service purposes...
  • Page 38 L508, L509, L510, L511 Check Connector Replace connector P500 Replace speaker Check speaker Maybe NTP3000 has problems. Replace it Copyright 2008 LG Electronics. Inc. All right reserved. - 38 - LGE Internal Use Only Only for training and service purposes...
  • Page 39 Copyright 2008 LG Electronics. Inc. All right reserved. - 39 - LGE Internal Use Only Only for training and service purposes...
  • Page 40 Check video output trouble shooting Follow procedure All source audio trouble Maybe BCM3553 internal audio DSP shooting has problems. Replace it Copyright 2008 LG Electronics. Inc. All right reserved. - 40 - LGE Internal Use Only Only for training and service purposes...
  • Page 41 Copyright 2008 LG Electronics. Inc. All right reserved. - 41 - LGE Internal Use Only Only for training and service purposes...
  • Page 42 Replace it R726 / C665 Follow procedure All source audio trouble Maybe BCM3553 audio block has shooting problems. Replace it Copyright 2008 LG Electronics. Inc. All right reserved. - 42 - LGE Internal Use Only Only for training and service purposes...
  • Page 43 Copyright 2008 LG Electronics. Inc. All right reserved. - 43 - LGE Internal Use Only Only for training and service purposes...
  • Page 44 Replace it or IC502 R548 / R549 / R550 Check Audio clock Replace it R134 Maybe BCM3553 has problems Copyright 2008 LG Electronics. Inc. All right reserved. - 44 - LGE Internal Use Only Only for training and service purposes...
  • Page 45 Copyright 2008 LG Electronics. Inc. All right reserved. - 45 - LGE Internal Use Only Only for training and service purposes...
  • Page 46 Power & I2C Signal (#5, #6) Follow procedure All source audio trouble Maybe BCM3553 audio block has shooting problems. Replace it Copyright 2008 LG Electronics. Inc. All right reserved. - 46 - LGE Internal Use Only Only for training and service purposes...
  • Page 47 Copyright 2008 LG Electronics. Inc. All right reserved. - 47 - LGE Internal Use Only Only for training and service purposes...
  • Page 48 - USB power could be disabled by inrushing current - In this case, remove the device and try to reboot the TV (AC power off/on) Copyright 2008 LG Electronics. Inc. All right reserved. - 48 - LGE Internal Use Only Only for training and service purposes...

  • Page 49: Block Diagram

    BLOCK DIAGRAM Copyright 2008 LG Electronics. Inc. All right reserved. - 49 - LGE Internal Use Only Only for training and service purposes...

  • Page 50: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright 2008 LG Electronics. Inc. All right reserved. - 50 - LGE Internal Use Only Only for training and service purposes...
  • Page 51 SCHEMATIC DIAGRAM Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 58 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 Copyright LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 Jun., 2008 P/NO : MFL41588002 Printed in Korea...

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