Question about Mitsubishi VS-50502 50" Rear Projection Television

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Mitsubishi Projection TV Model # VS-50502

The TV has been doing some real wierd things lately. Initially the screen would start to flutter and then the screen would completely black out. If you powered down the unit and waited about 10 minutes before powering back on, then it would seem to be OK until next time (this usually happened once a week). Recently the TV did the same thing, but it powered itself off. Now, I can't get the TV to stay on more than 10-15 seconds. When I try to power it on, it makes this wierd pulsating noise from the back of the unit and then it powers itself off again. It doesn't power up long enough to even get a picture on. Any thoughts on what the problem may be? Could it possibly be a bad power supply? Please help with your expertise.

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  • Needinghelp1 Mar 04, 2008

    The technician that I called in wasn't exactly an expert with rear projection televisions. He was unable to diagnose and fix the T.V. I offered him the comments that were suggested by sedonix and he didn't seem too interested in them (probably because of his inexperience). So, honestly I can't even make a complete conclusion on whether or not the suggestions would have worked.

    But, thanks for responding to my problem. It is much appreciated.

  • dhapp60 Oct 20, 2008

    Same situation use to have periodic picture going dark. now the TV does it after about one minute, but the power and sound stay on.



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The power supply section is having trouble.
Common possibilities are:
- Convergences amps have failed overloading the supply
- High-voltage section (flyback transformer) has failed
(happens sooner or later, about 8 years typical))
- Power surge has popped the power input circuit.
(Fuse, rectifier diodes, turn-on relay etc)
- One of a hundred of electrolytic capacitors has failed short overloading the supply. They dry out with age, are cheap to replace, but hard to find which one it is.
- Or any of many other possibilities.

In short, you need a experianced tech to troubleshoot this.

Posted on Feb 13, 2008


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