LG LB81D Service Manual

Chassis : lb81d

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LCD TV

SERVICE MANUAL

CHASSIS : LB81D

MODEL : 42LG70YD

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

Internal Use Only

website:http://biz.LGservice.com

42LG70YD-AA

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Summary of Contents for LG LB81D

Page 1: Service Manual
Internal Use Only website:http://biz.LGservice.com LCD TV SERVICE MANUAL CHASSIS : LB81D MODEL : 42LG70YD 42LG70YD-AA 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...................19 EXPLODED VIEW .................. 21 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: 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 © 2008 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 © 2008 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
Page 6: Specification
2) Humidity : ~ 80 % LGE Spec 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 59.8 84.75 WXGA 1366*768 47.56 59.6 84.75 WXGA 1280*1024 63.595 60.0 108.875 SXGA 1920*1080 66.647 59.988 138.625 WUXGA Copyright © 2008 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
Page 8 148.500 HDTV 1080P 50Hz HDCP 1920*1080 67.433 59.94 148.352 HDTV 1080P HDCP 1920*1080 67.500 148.500 HDTV 1080P HDCP Copyright © 2008 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
Page 9: Adjustment Instruction
“AC Power” off. filexxx.bin 6) After putting “AC Power” on and check updated version on your TV. Copyright © 2008 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
Page 10 MODEL : 209 in Pattern Generator(480i Mode) Pattern : 65 in Pattern Generator (MSPG-925 Series, MPSG-1025D) - 7 color bar. Copyright © 2008 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
Page 11: Edid Data
* Don’t push The “IN STOP KEY” after completing the function 20 58 2C 25 C4 8E 21 inspection. 00 00 00 00 00 Copyright © 2008 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
Page 12 EDID data storage EEPROM automatically when you push down “power only” key, download progress is not needed. Copyright © 2008 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
Page 13 E2PROM by 128(80h)-byte 20 : SCART1 30 : SCART2 40 : Component 60 : RGB 90 : HDMI Copyright © 2008 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
Page 14 PC. (128th Data is the CheckSum of 127-bytes data : That’s OK if the value of adding 128-bytes Data is Zero) START Data 1 Data 128 STOP Copyright © 2008 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
Page 15: Troubleshooting
After checking thoroughly all path once again, You should decide to replace Main Board or not. Copyright © 2008 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
Page 16 After checking thoroughly all path once again, You should decide to replace Main Board or not. Copyright © 2008 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
Page 17 After checking thoroughly all path once again, You should decide to replace Main Board or not. Copyright © 2008 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
Page 18: Hdmi Doesn't Display
After checking thoroughly all path once again, You should decide to replace Main Board or not. Copyright © 2008 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
Page 21: Exploded View
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent 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. - 21 - LGE Internal Use Only...
Page 31 Jun,, 2008 P/NO : MFL47147102 Printed in Korea...

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