LG 42LB7DF Service Manual

Hide thumbs Also See for 42LB7DF:

Owner's manual (128 pages)

Table Of Contents

Table of Contents

Quick Links

Download this manual See also: Owner's Manual

LCD TV

SERVICE MANUAL

CHASSIS : LJ81A

MODEL : 42LB7DF

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

Internal Use Only

website:http://biz.LGservice.com

42LB7DF-SB

Table of Contents

Summary of Contents for LG 42LB7DF

Page 1: Service Manual
Internal Use Only website:http://biz.LGservice.com LCD TV SERVICE MANUAL CHASSIS : LJ81A MODEL : 42LB7DF 42LB7DF-SB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Page 2: Table Of Contents
PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ...............12 TROUBLE SHOOTING ................20 BLOCK DIAGRAM...................48 EXPLODED VIEW .................. 54 SVC. SHEET ....................Copyright©2007 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©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
2) Humidity : ~ 80 % Storage Environment 1) Temp : -20 ~ 60 deg 2) Humidity : ~ 85 % Copyright©2007 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
Page 7 HDTV 1080P 33.71 29.97 74.176 1920*1080 HDTV 1080P 56.25 50.000 148.5 1920*1080 HDTV 1080P 28.125 25.000 74.25 1920*1080 HDTV 1080P Copyright©2007 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
Page 8 63.981 60.020 108.00 VESA (SXGA) 1280*1024 79.976 75.025 VESA (SXGA) 1600*1200 75.00 60.00 VESA (UXGA) 1920*1080 67.5 148.5 HDTV 1080P Copyright©2007 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
Page 9 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©2007 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
Page 10 Viewing Angle (CR>10) X axis right(ø=0) degree X axis left(ø=180) Yaxis up (ø=90) Z axis down(ø=270) Gray Scale Without DCR With DCR Copyright©2007 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
Page 11 Set password ( Default : 0000 ) Block channel None Movie Rating TV Rating-Children TV Rating-General Audio Block Channel Memory none Copyright©2007 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
Page 12: Adjustment Instruction
EDID(The Extended Display Identification Data) / DDC(Display Data Channel) download Color Temperature(White Balance) Adjustment Make sure RS-232C control Selection Factory output option Copyright©2007 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
Page 13 Supply voltage 3.3-V Operation No connect No connect DATA0 Data to device Data to device Signal ground Signal ground Copyright©2007 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
Page 14 The ByteBlasterMV cable downloads the data from the SOF and/or POF file(s) into the device(s). Copyright©2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
Page 15 0.7V±0.1V p-p correctly) * You must make it sure its resolution and pattern cause every instrument can have different setting. Copyright©2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
Page 16 LCD TV SET (or Digital Board) <Fig.4> For write EDID data, setting Jig and another instruments 6-3. EDID data (Model name = LG TV) (1) HDMI-1 EDID table (4) Analog(RGB) EDID table * See Working Guide if you want more information about EDID communication.
Page 17: White Balance
3) Connect RS-232C cable to set 4) Connect HDMI cable to set 5) Select LA75A Chassis at Adjustment equipment, and adjust. Copyright©2007 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
Page 18 “Option” Menu with “PIP CH-” Button. (3) Select one of these three (USA, CANADA, MEXICO) defends on its market using “Vol. +/-” button. Copyright©2007 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
Page 19 (2) Threshold Up Low (3) Threshold Down High Set ID (4) Threshold Down High Channel Memory RF : 2,3,4,5,6,7,8,9,10,11, 12,13,14,30,51,63 CATV : 15,16,17 Copyright©2007 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
Page 20: Troubleshooting
TROUBLESHOOTING 1. Power-Up Boot Fail 1-1. Block Diagram of Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...
Page 24 TROUBLESHOOTING 3. Digital TV Video 3-1. Block Diagram of Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...
Page 26 TROUBLESHOOTING 4. Analog TV Video 4-1. Block Diagram of Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...
Page 28 TROUBLESHOOTING 5. Component Video 5-1. Block Diagram of Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...
Page 34 TROUBLESHOOTING 8. HDMI Video 8-1. Block Diagram of Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 34 - LGE Internal Use Only Only for training and service purposes...
Page 36 TROUBLESHOOTING 9. All Source Audio 9-1. Block Diagram of Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 36 - LGE Internal Use Only Only for training and service purposes...
Page 38 TROUBLESHOOTING 10. Digital TV Audio 10-1. Block Diagram of Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 38 - LGE Internal Use Only Only for training and service purposes...
Page 40 TROUBLESHOOTING 11. Analog TV Audio 11-1. Block Diagram of Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 40 - LGE Internal Use Only Only for training and service purposes...
Page 42 TROUBLESHOOTING 12. Component / RGB / AV Audio 12-1. Block Diagram of Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 42 - LGE Internal Use Only Only for training and service purposes...
Page 43 TROUBLESHOOTING 12. Component / RGB / AV Audio 12-2. Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 43 - LGE Internal Use Only Only for training and service purposes...
Page 44 TROUBLESHOOTING 13. HDMI Audiol 13-1 Block Diagram of Troubleshooting Copyright©2007 LG Electronics. Inc. All right reserved. - 44 - LGE Internal Use Only Only for training and service purposes...
Page 55 READY READY READY READY EBI_TSIZE1 AC27 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC . EBI_WE0 AC28 D6;10:BA16 EBI_WE1 b EBI_WE1 NAND_P B Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 56 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©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 57 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©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 58 PRINTED CIRCUIT BOARD MAIN (BOTTOM) MAIN (TOP) IR/LED(TOP) CONTROL B/D(TOP) SIDE A/V (TOP) SIDE A/V (BOTTOM) IR/LED(BOTTOM) CONTROL B/D(BOTTOM) Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 59 Dec., 2007 P/NO : MFL41546701 Printed in Korea...

This manual is also suitable for:

42lb7df-sb

LG 42LB7DF Service Manual

Quick Links

SERVICE MANUAL

Summary of Contents for LG 42LB7DF

Page 1: Service Manual

Page 2: Table Of Contents

Page 3: Product Safety

Page 4: Servicing Precautions

Page 6: Specification

Page 12: Adjustment Instruction

Page 17: White Balance

Page 20: Troubleshooting

Page 48: Block Diagram

Page 54: Exploded View

This manual is also suitable for:

LG 42LB7DF Service Manual

Quick Links

SERVICE MANUAL

Related Manuals for LG 42LB7DF

Summary of Contents for LG 42LB7DF

This manual is also suitable for:

Table of Contents