Question about Philips 20PT91S 20" TV

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Problems with on/off button

I am having problems with my tv. i bought the tv 1 year ago and I am already having problems. My problem is when I turn on the TV nothing really happens. You can hear it turn on and the light turns on then within 3 to 5 second it turns itself off. I just want to know what should I do replace the tv or should I have it service? I am having problems with my tv. iMy problem is when I turn on the TV nothing really happens. You can hear it turn on and the light turns on then within 3 to 5 second it turns itself off. I just want to know what problem it may be as most of tv mechanics have asked to change Command IC and few times I have already paied to their workshop. But after 1 or 2 months its again happening. from where this problem is arises.

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The regulator is maybe running at more than 127 volts. hook up a variac and run at 100vac and see if the set stays on.
the horizontal output transistor will blow the main fuse and the set will not run at all.
i would send the tv to an authorized philips depot

Posted on May 16, 2009

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Your Problem is the Hot transistor, it is short circuit. Causing the tv to go into protection. I f you say this is the second time the same problem tell the technician who works on the tv to replace all the caps on the collector of the Transistor and check the lopt transformer causing the HOT transisistor to fail thank you

Posted on May 16, 2009

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