HELLO TECHS. I HAVE AN RCA PROJECTION TV CHASSIS # PTK195 APPROX SIX YEARS OLD. THE PROBLEM IS WEIRD. IT PLAYS GOOD, BUT SOMETIMES ,JUST ABOUT EVERY OTHER DAY IT HAS A DIFFERENT SOUND. BY THAT I MEAN THE REGULAR AUDIO GOES OUT, AND THEN ANOTHER AUDIO COMES IN WHICH IS A NARRATORS VOICE TELLING THE VEIWERS WHAT IS GOING ON, YOU KNOW LIKE , SAY FOR INSTANCE, THE MAN IS NOW WALKING TOWARD THE WOMAN. NOW THEY ARE TALKING. THE WOMAN SLAPS THE MAN. THE MAN LEAVES. ETC. ETC. IT IS LIKE SOME SORT OF CLOSED CAPTION OR SOMETHING. BUT NO WORDS ARE ON THE SCREEN. AND IF YOU CHANGE CHANNELS SOME HAVE NORMAL SOUND AND SOME HAVE NO SOUND. I HAVE ALREADY TRIED THE CLOSED CAPTION MODES, SAP ETC.WITH NO CHANGE. THE ONLY WAY TO FIX THE PROBLEM TEMPORARY IS TO UNPLUG THE TV OVER NIGHT AND THEN IT WILL WORK FOR A DAY OR SO AND DO IT AGAIN. I KNOW THIS SOUNDS CRAZY, AND I DIDN'T BELEIVE THE CUSTOMER, UNTIL I SEEN IT FOR MY SELF. (PUZZELED TECH)
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I don't mean to joke, but your not watching a documentary are you? If not, I would suspect Secondary Audio Programming, frequency changes, tuner circuitry audio portion. The SAP audio goes from 60 Hz to 12 kHz, which is less than the "regular" audio channel accepting from 50 Hz to 15 kHz. The SAP channel contains mono audio which has been dbx-encoded for noise reduction, to improve the signal-to-noise ratio. Unplugging over night is "resetting" circuit. Processor input changing from 0-2.5v to 5+ v. low to high.
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