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RCA HD50LPW162 color display all out of wack

This unit is 4 years old this year. I bought it for $500 from a
private party a year ago and have had no significant problems until
last month. The colors on the screen started flickering after the t.v.
had been on a few hours, until eventally it became unwatchable. I
assumed it was a bad lamp and so replaced it. It wasn't until I did
further research when I realized my set didn't have the symptoms for a
blown lamp.
These are the present symptoms: After between a few minutes and up to
an hour of viewing, the picture starts flickering with a whole variety
of colors that sometimes look 'negative'. I can hear the hum from the
fan going in sync with the flickering, intermittenly stuttering then
emitting a high pitched whine, much like the sound you hear when you
first power the set up. Sometimes the screen goes black and the power
light flashes 5x followed by a pause, and then the picture comes back
(still horrible as before). It happens with both cable and video
inputs, though the sound is fine. Sometimes I can turn the set off for
a few minutes and then back on and the picture is great for a few, but
eventually it gets back to the bright, crazy flashing screen. There
are no distortions (warping, etc.).
After looking around, I've seen a ton of problems with the 50"
Sceniums from bad color wheels, to bad light engines, to bad boards.
Does anybody have an idea of what this might be? I called a repair
shop and they were puzzled as well, and insisted they come and do a
$90 service call, delivering it back to the shop if necessary. I told
them that it takes some time for the problem to present itself,
meaning they could be at my house for awhile. I just want to know if
it would be worth the repair. When it works, it works spendidly and
the picture on HD is phenomenal.
I appreciate any thoughts you can send my way. I've attached before
and after photos, not the best quality as they were taken on my phone,
but it gives you an idea of what I'm dealing with.

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STK ics faulty on the main power supply board.replace them all and it should then work properly.

Posted on Nov 05, 2008

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