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Service manuals & datasheets => LCD TV forum => Topic started by: slimjimmy on April 21, 2010,08:21:11

Title: DMTECH LU20DV
Post by: slimjimmy on April 21, 2010,08:21:11

Red led is lit but won't power on - there is no 3.3volt from q806 this is a LM2576-3-3DD.
After changing q806 still no power.
Any help appreciated.
I would also be grateful for a schematic diagram. The chassis number on the PCB is PLVM01.

Title: Re: DMTECH LU20DV
Post by: Turnip on April 21, 2010,12:00:07

Hi,

No shematic, but links suggest P/S caps are a problem. Suggest change any caps found bulgy, and/or do ESR check.

Pic of PS could be useful - Chris.

Title: Re: DMTECH LU20DV
Post by: slimjimmy on April 22, 2010,10:14:21

Thanks for the info Chris.
I have already checked for bulging caps and also replaced some.
Unfortunately I don't know how to upload a photo.