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TV LOEWE 8784. Died SPP11N60S5 in the power supply. After replacement of the MOSFET the TV worked for a day then next morning it died again on a start. This way were killed 3 MOSFETs. What could be the problem? Please help.

Posted by Sergei Sokolov on

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Donald DCruz

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Possible that when the MOSFET'S were changed the Switch mode oscillations were not proper and so the drivers were driven too much to fail.
It will be best to replace the whole power supply if the mosfets are heating up more than required.
Also replace all the electrolytics and check the SM transformer after the mosfets are replaced and before switch on. Check also the load on the output , if there is any short or leakage on the drive output .

Posted on Aug 04, 2011

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