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The tv went off on its own,when you power on the led comes on for seconds and goes off.There is a hissing sound heard from the chopper transformer.i checked powersupply and replaced,STR REGULATOR,OPTO COUPLER,MAINCAP,RECTIER,ERROR AMP and several surge caps in the powersupply.i isolated proccesor ic and the led would come on normal.i checked 5V,8V and 12V regulators and still nothing.all the secondary voltages are missing including the B+.Kindly assist.

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It was not necessry to replace so many parts if you go as per proper procedure.please proceed as 1 isolate horizontal output section from power supply & make power supply ok. 2 if it becomes ok check hor osc,driver&h/output section. 3 if it is ok connect power input to hor.section which was isolated. 4 check for loose contact or print. 5 put on tv .

Posted on Sep 22, 2007


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