Question about Haier HTN20R15 TV

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SWITCTHING TRANSISTER C4584 GETS HEATED .BUT NOOPERATION.WHY?

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There is a problem with the "tuning" frequency. There are various capacitors that ensure the transistor actually switches and doesn't spend much time turning on or off and causing heat.
I suspect the switching transformer has a diode on its secondary winding that is leaking and upsetting the tuning.
Hope this helps.

Posted on Nov 15, 2010

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