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When it shuts off and the green power light goes off, press both the menu and input buttons on the front of the set (not the remote) and hold both for about five seconds and release.
Power light will blink a two digit error code like 2 blinks and then 3 blinks and repeat it several times.
This is a V20 chassis and if it shuts down it should trigger an error; note if no error the power light should blink 1, 2 pause and repeat it several times---this is no error found.
I would unplug the set for a few minutes (this clears the error buffer) and turn on again and wait for failure; you must push menu and input and hold for at least 5 seconds and let both go.
IF no error code this is a model made around 2002 (date will be on back of set) and it must display some error code.
If you find none I can suggest looking for any signs of Glycol leaks inside the set. If you need to know what to look for let me know and I will tell you.
Again: All models after 2000 (and some before) have the error buffer.
The next time it shuts down (I presume the green power light goes off) do the self check this model has, on front of set press and hold both the menu and input buttons for at least five seconds and release both.
Power light will blink a 2 digit error code like : 1 blink, 2 blink and repeat it several times.
1,2 is no error detected but there are other codes.
I believe your model is a PTK188 can you look for the chassis number off the tag on the back, and I may be able to help you locate a manual, but the older RCA / Proscan / GE need the chassis number
Sometims several capacitors start going bad giving you the audio problem, but I don't remember the set turning itself off. That could be a secondary problem around the flyback transformer which may have a bad solder connection. I would check that first. Otherwise, I would be tempted to go with HDTV.
A television!
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