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LCD TV
SERVICE MANUAL
CHASSIS : LD03B
MODEL : 42LD750/750N
MODEL :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL62863019 (1002-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42LD790
42LD751
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
42LD750/750N-ZA
42LD790-ZA
42LD751-ZB
Printed in Korea
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Summary of Contents for LG 42LD750
- Page 1 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 : LD03B MODEL : 42LD750/750N 42LD750/750N-ZA MODEL : 42LD790 42LD790-ZA MODEL : 42LD751 42LD751-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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Page 2: Table Of Contents
PRODUCT SAFETY ................. 3 SPECIFICATION ..................4 ADJUSTMENT INSTRUCTION ..............7 BLOCK DIAGRAM...................14 EXPLODED VIEW .................. 15 SVC. SHEET ....................Copyright © 2010 LG Electronics. Inc. All rights 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 © 2010 LG Electronics. Inc. All rights reserved. - 3 - LGE Internal Use Only Only for training and service purposes... -
Page 4: Specification
2) Stable for approximately 60 minutes in a dark environment at 25 ºC. 3) The values specified are at approximate distance 50 cm from the LCD surface. Copyright © 2010 LG Electronics. Inc. All rights reserved. - 4 - LGE Internal Use Only... - Page 5 47.72 59.8 84.75 WXGA 1280*1024 63.595 60.0 108.875 SXGA FHD model 1920*1080 66.587 59.93 138.625 WUXGA FHD model Copyright © 2010 LG Electronics. Inc. All rights reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
- Page 6 59.8 84.75 WXGA HDCP 1280*1024 63.595 60.0 108.875 SXGA HDCP/FHD model 1920*1080 67.5 60.00 138.625 WUXGA HDCP/FHD model Copyright © 2010 LG Electronics. Inc. All rights reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
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Page 7: Adjustment Instruction
- Pattern level : 0.7±0.1 Vp-p - Image 1) Communication Prot connection Connect: PCBA Jig-> RS-232C Port== PC-> RS-232C Port Copyright © 2010 LG Electronics. Inc. All rights reserved. - 7 - LGE Internal Use Only Only for training and service purposes... - Page 8 Po w e r I n p u t Power Input Po w e r Blo ck Liquid Crys tal Row Li ne Copyright © 2010 LG Electronics. Inc. All rights reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
- Page 9 Check the model name Instart menu -> Factory name displayed (ex 42LE7500-ZA) e. Check the Diagnostics (DTV country only) -> Buyer model displayed (ex 42LE7500-ZA) Copyright © 2010 LG Electronics. Inc. All rights reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
- Page 10 ⓔ 0x07 * Address 10/11 and 7F means Manufacture Week and Checksum. So this data will be change. Copyright © 2010 LG Electronics. Inc. All rights reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
- Page 11 -> Only when internal pattern is not available G-Gain Color Analyzer Matrix should be calibrated using CS-1000 B-Gain R-Cut G-Cut Copyright © 2010 LG Electronics. Inc. All rights reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
- Page 12 COOL 0.269 0.273 13000 K 0.0000 MEDIUM 0.285 0.293 9300 K 0.0000 WARM 0.313 0.329 6500 K 0.0000 Copyright © 2010 LG Electronics. Inc. All rights reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
- Page 13 1. RF input: Mono, 1 KHz sine wave signal, 100 % Modulation 2. CVBS, Component: 1 KHz sine wave signal 0.4 Vrms 3. RGB PC: 1 KHz sine wave signal 0.7 Vrms Copyright © 2010 LG Electronics. Inc. All rights reserved. - 13 - LGE Internal Use Only...
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Page 14: Block Diagram
BLOCK DIAGRAM Copyright © 2010 LG Electronics. Inc. All rights reserved. - 14 - LGE Internal Use Only Only for training and service purposes... -
Page 15: Exploded View
X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. LV1 LV2 Copyright LG Electronics. Inc. All rights reserved. - 15 - LGE Internal Use Only Only for training and service purposes... - Page 16 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. BCM3556 & NAND FLASH Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 17 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. BCM3556 AUD_IN/LVDS Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 18 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. BCM3556 VIDEO IN Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 19 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR HONG YEON HYUK THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. DDR Memory Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 20 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. ETC SUB BOARD I/F Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 21 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. ( Full Nim ) Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 22 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 23 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. ETC SUB BOARD I/F Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 24 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. luetooth Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 25 EUROBBTV 2009.06.18 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 26 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR URSA3 120Hz MINI_LVDS THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 27 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 3 120Hz LVDS Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 28 BCM (EUROBBTV) ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. POWER Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 29 GP2_Saturn7M ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MICOM Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 30 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR LEE GI YOUNG THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. HDMI Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 32 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. ETC SUB BOARD I/F Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 33 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. SIDE_AV Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 34 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. IRELESS Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 35 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR KIM JONG HYUN THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. NTP7000 Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 36 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR URSA3 DDR & Power THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 37 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. URSA3 (NO L.D.) Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 38 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. T-Con (NO L.D.) Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
- Page 39 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. T-Con Power Option Copyright © 2010 LG Electronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...