Related Manuals for LG 37LT75
Summary of Contents for LG 37LT75
- Page 1 Internal Use Only website:http://biz.LGservice.com LCD TV SERVICE MANUAL CHASSIS : LD74A MODEL : 37LT75 37LT75-ZA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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Page 2: Table Of Contents
BLOCK DIAGRAM...................26 EXPLODED VIEW .................. 34 EXPLODED VIEW PARTS LIST ..............35 REPLACEMENT PARTS LIST ............... 36 SVC. SHEET ....................Copyright © 2007 LG Electronics. Inc. All right reserved. - 2 - 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 © 2007 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes... - Page 4 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...
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Page 6: Specification
Back Light 18 EEFL 32" 20 EEFL 37" 20 CCFL 42" Display Colors 16.7M (16,777,216) Coating 3H, AG Copyright © 2007 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes... - Page 7 59.94 HDTV 720p 1920*1080 31.25 50.00 HDTV 1080i 1920*1080 33.75 60.00 HDTV 1080i 1920*1080 33.72 59.94 HDTV 1080i Copyright © 2007 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
- Page 8 Input 1920*1200 60Hz Ë 1600*1200 60Hz Display 1920*1080 66.647 59.988 138.625 WUXGA Reduced Blanking Timing 7-1. EDID Data (RGB-PC) Copyright © 2007 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
- Page 9 Input 1920*1200 60Hz => No Signal 1920*1080 66.647 59.988 138.625 WUXGA Reduced Blanking Timing DTV mode => 1080P Display Copyright © 2007 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
- Page 10 8-2. HDMI EDID Data [HDMI1] [HDMI2] Copyright © 2007 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
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Page 11: Adjustment Instruction
1. Application Range 4.1. EDID Data Item Condition Hex(16) Data This spec. sheet is applied to all of the LD74A chassis manufactured at LG TV Plant all over the world Manufacturer ID 1E6D Version Digital : 1 2. Specification Revision Digital : 3 2.1 Because this is not a hot chassis, it is not necessary to use... - Page 12 [Fig.1 Color Bar Signal] 5) Auto-RGB OK means the adjustment is completed. 3) Press IN-START key on R/C for adjustment. Copyright © 2007 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
- Page 13 *Color temperature standards according to CSM and Module the others, check the back light on. Cool 11,000k Medium 9,300k Warm 6,500k Copyright © 2007 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
- Page 14 3) Press the IN-START key on R/C for adjustment. 4) Press ths TURBO-PICTURE Key on R/C for adjustment [Fig. 8 Color Bar Signal] Copyright © 2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
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Page 15: Troubleshooting
AC voltage marking on manual. When ST-BY 5V does not operate, replace Power Board. Copyright © 2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes... - Page 16 Is normal the output voltage after Is normal the VSC normal operation: remove P900, P901 of VSC Board? Board? Replace VSC Board Copyright © 2007 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
- Page 17 Reconnect the LVDS Is the LVDS cable in P1901. cable normal? Is the IC700 (FLI8548) Replace the VSC Output normal? Copyright © 2007 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
- Page 18 Operates the FIL8548 IC(IC700)? Board? Replace FIL8548 IC(IC700). Is normal the Ctrl Replace Ctrl B/D. Board of Module? Copyright © 2007 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
- Page 19 Block A Is normal the Is normal the Input voltage, IIC Replace IC FIL8548? Communication and HV sync? Copyright © 2007 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
- Page 20 Is normal the Input voltage, IIC Replace IC HDMI002 (IC1004)? Communication and HV sync? Same as Block A Copyright © 2007 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...
- Page 21 (8) In the case of becomes unusual display from SCART2 mode Is Video input Check the input source. of A/V jack normal? (J1201) Same as Block A Copyright © 2007 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
- Page 22 Check the signal before (except HDMI, CXA2069 refer to circuit diagram DTV,RF) is no sound? Replace VSC BD Copyright © 2007 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...
- Page 23 NEC64015A Is it ok? Is it ok? change time shift mode from off to on Replace VSC BD Copyright © 2007 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...
- Page 24 Are they ok? Check MSP(IC1300), Change the ICs Audio AMP(IC1301) Is it ok? Is it ok? Replace VSC BD Copyright © 2007 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...
- Page 25 (IC 100), NEC61151F(IC1600) NEC64015A(IC1901) Is it ok? Change HDD Replace VSC BD Is it ok? Copyright © 2007 LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...
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Page 26: Block Diagram
BLOCK DIAGRAM Copyright © 2007 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes... - Page 27 Copyright © 2007 LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...
- Page 28 Copyright © 2007 LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...
- Page 29 Copyright © 2007 LG Electronics. Inc. All right reserved. - 29 - LGE Internal Use Only Only for training and service purposes...
- Page 30 Copyright © 2007 LG Electronics. Inc. All right reserved. - 30 - LGE Internal Use Only Only for training and service purposes...
- Page 31 Copyright © 2007 LG Electronics. Inc. All right reserved. - 31 - LGE Internal Use Only Only for training and service purposes...
- Page 32 Copyright © 2007 LG Electronics. Inc. All right reserved. - 32 - LGE Internal Use Only Only for training and service purposes...
- Page 33 MEMO Copyright © 2007 LG Electronics. Inc. All right reserved. - 33 - LGE Internal Use Only Only for training and service purposes...
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Page 34: Exploded View
X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 34 - LGE Internal Use Only Copyright LG Electronics. Inc. All right reserved. Only for training and service purposes... -
Page 35: Exploded View Parts List
Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes... -
Page 36: Replacement Parts List
Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes... - Page 37 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 38 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 39 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 40 Aug., 2007 P/NO : MFL38458103 Printed in Korea...