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It sounds like your lamp is about to die out,this tv lamps are good for 6000-8000 life hours which is a average time of 2-4 years old and with time the picture starts to get darker and darker until one day black screen. Try Encompass .com ; shopjimmy.com
If you have electronics experience - check the power supply and make sure you are getting the correct voltage to your inverter boards and main av board - also do you see any movement on the screen take a flashlight and shine on the screen - if you can see a dark image on the screen check inverter boards and power first.
This is a well-known problem with many Polaroid FP displays. Eventually, the picture will simply go black, rendering the TV useless. The solution is a new control board, ~$400.
that's a picture inside a picture option, and it sounds like the inside picture is set for a blank channel...just go to the menu, and shut off the picture in a picture option..should do the trick..
the tv turns on fine,
but after 5 - 30 min or so, "sometimes MORE " the picture all of a sudden go's black. Sound is ok
it is 100% loose contact problem.
1 please check for any connector or print for loose.
2 in signal processor ic there might be loose.
remember there is no component failure.
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