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From: kludge@grissom.larc.nasa.gov ( Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: Sony TV Hi-Pitch squeal
Message-ID: <1991Jun3.150425.4892@news.larc.nasa.gov>
Date: 3 Jun 91 15:04:25 GMT
References: <6298@ns-mx.uiowa.edu>
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Reply-To: kludge@grissom.larc.nasa.gov ( Scott Dorsey)
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In article <6298@ns-mx.uiowa.edu> ffang@umaxc.weeg.uiowa.edu (Francis Fang) writes:
>I've got a 2 year old 27" Sony TV that has been great except for recently
>when I've noticed that there is a semi-loud high pitch squeal that accompanies
>the operation of the set. Does anyone out there have any suggestions for
>probable cause?

Bets are that what you are hearing is the vertical sweep oscillator.  If so,
you should be happy that your hearing responds to such high frequency.

Possibilities are that the flyback transformer has begun to vibrate slightly,
or one of the capacitors has begun to vibrate at that frequency.  If you take
a tube puller and put some cotton on it, you should be able to go around and
grab components in the sweep circuit until you find the one that's doing it.
Bets are good that it's on the flyback.

Of course, you could always go to a couple of good, loud rock concerts and
eliminate your high frequency hearing.
--scott