LG Electronics 425020, 425030, 425010 service manual DTV doesnt display

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DTV doesn￿t display

Check the output data of TU800

Pin 24~34

Can you see the normal signal?

YES

NO

Could you measure voltage of

TU800 & IIC lines? Are they all normal?

YES

You should replace TUNER.

NO

You should check power line

& IIC lines.

Check the output of Main IC(IC100).

NO

Especially you should check

 

The H,V sync and clock.

 

Can you see the normal waveform?

 

YES

 

This board has big problem because Main IC(IC100) have some troubles.

After checking thoroughly all path once again, You should decide to replace Main Board or not.

After checking the Power of Main

IC(IC100) you should decide to replace

Main IC or not.

Copyright © 2007 LG Electronics. Inc. All right reserved.

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LGE Internal Use Only

Only for training and service purposes

 

 

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Contents LCD TV Contents General Guidance Safety PrecautionsElectrostatically Sensitive ES Devices Servicing PrecautionsIC Remove/Replacement Application Range SpecificationSpecification General SpecificationModel General Specification RED Chroma & BrightnessMAX / MIN 更多难得资料请到江南家电维修论坛免费下载! http//bbs.520101.com Component Video Input Y, PB, PR SET Optical FeatureHdmi Input PC Hdmi Input DTVMechanical specification Main PCB check process Adjustment InstructionApplication Range USB Download Calibration Component Total Assembly line processAV SCART1/SCART2/S-VHS/CVBS Hdmi更多难得资料请到江南家电维修论坛免费下载! http//bbs.520101.com Edid Data How to adjust Adjusting the White BalanceGND and resisting pressure test Set the shipping mode In-stopSelect the option by country ISP Download option Adjustment condition Download conditionHow to adjust for downloading USB S/W Download option How to dowunloadTV/CATV doesnt display TroubleshootingDTV doesnt display AV1/2/3 doesnt display Component doesnt display RGB PC doesnt display Hdmi doesnt display LCD Panel Block DiagramExploded View 更多难得资料请到江南家电维修论坛免费下载! http//bbs.520101.com 更多难得资料请到江南家电维修论坛免费下载! 更多难得资料请到江南家电维修论坛免费下载! http//bbs.520101.com Apr