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Summary of Contents for LG 32LT75/76
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Page 1: Service Manual
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 : LD74A MODEL : 32LT75/76 32LT75/76-ZA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. -
Page 2: Table Of Contents
ADJUSTMENT INSTRUCTION ...............10 TROUBLE SHOOTING ................14 BLOCK DIAGRAM...................23 EXPLODED VIEW .................. 28 REPLACEMENT PARTS LIST ............... 30 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...
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Page 6: Specification
HDMI Input (2EA) HDMI-PC HDMI-DTV & SOUND Audio Input (4 EA) PC Audio, Component, AV (2EA) L/R Input 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 HDTV 1080P 50Hz 1920*1080 67.433 59.94 148.352 HDTV 1080P PC mode -> 1920*1080 60Hz Display 1920*1080 67.500 148.500 HDTV 1080P 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...
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Page 10: Adjustment Instruction
(1) ANALOG (128 bytes) This spec. sheet is applied to all of the LD74A chassis manufactured at LG TV Plant all over the world. 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F... - Page 11 (Vol.+) key to operate the set , then it becomes automatically. 5) Auto-RGB OK means the adjustment is completed. Copyright © 2007 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
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Page 12: White Balance
R/C IN-START -> Enter the mode of White-Balance, the pattern will come out. Copyright © 2007 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes... - Page 13 R e s e t T o S e t S c a r t R G B ( D V R ) Copyright © 2007 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
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Page 14: Troubleshooting
After removing the cables, connect them to the Power Board(except the SC101 connection cable), and change the AC voltage marking to manual. When ST-BY 5V does not operate, replace the Power Board. Copyright © 2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only... - Page 15 Is the LVDC cable Reconnect the LVDS cable in P1901 normal? Is the IC700(FLI8548) Replace the VSC. Output normal? Copyright © 2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
- Page 16 IC(IC700) operate? normal? Replace the FIL8548 IC(IC700) Is the Ctrl Board of Replace the Ctrl B/D. Module normal? Copyright © 2007 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
- Page 17 Are the R,G,B input and H,V Check the input source. Sync of the J1100 normal? Same as Block A Copyright © 2007 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
- Page 18 (8) In case of an unusual display in SCART2 mode Is the Video input of the Check the input source. A/V Jack(J1201) normal? Same as Block A Copyright © 2007 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
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Page 19: In Case Of No Sound
Is the IC1301 for specific input? CAX2069 refer to circuit diagram (STA335BW) operating normally? (except HDMI,DTV,RF) Replace the VSC B/D. Copyright © 2007 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes... -
Page 20: Dvr Function
Is it ok? (IC100). Check STI5100 IC(IC100), Replace STI5100 IC(IC100) NEC61151F(IC1600), NEC61151F(IC1600) NEC64015A(IC1901). NEC64015A(IC1901). Is it ok? Replace VSC Board. Copyright © 2007 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes... - Page 21 Are they ok? Check MSP(IC1300), Change the ICs. Audio AMP(IC1301) Is it ok? Is it ok? Replace VSC B/D. Copyright © 2007 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
- Page 22 Check STI5100 IC(IC100), NEC61151F(IC600) Connect cable well. NEC64015A. Is it ok? Change HDD. Replace VSC B/D Is it ok? Copyright © 2007 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...
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Page 23: Block Diagram
BLOCK DIAGRAM 1. IDTV DVR Copyright © 2007 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes... - Page 24 FMIGNT( DVB - CI/ Cab le Card I/ O read St ro b e) MPENC_TS__D [ 0 : 7] MPENC_TS__CLK MPENC_TS__VAL IRQ1 MPENC_TS__SYN IRQ2 MPENC_RESET_ST Copyright © 2007 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...
- Page 25 AV2_Lin/ Rin J1201 J1201 DVR_L/ R MC33078 MC33078 Lin5/ Rin5 Sid e AV Sid e AV P1400 P1400 Copyright © 2007 LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...
- Page 26 DDC_SDA_0 / DDC_SCL_0 J1000 HDMI JACK + 5VST IC1002 SDA_HDMI_1 / SCL_HDMI_1 AT24C028 DDC_SDA_1 / DDC_SCL_1 J1000 HDMI JACK Copyright © 2007 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...
- Page 27 MEMO Copyright © 2007 LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...
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Page 28: Exploded View
X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright 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. LGE Internal Use Only Only for training and service purposes...
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Page 30: Replacement Parts List
Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes... - Page 31 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 32 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 33 Aug., 2007 P/NO : MFL39435601 Printed in Korea...
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