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From: falcon@hubcap.clemson.edu (james lysaght)
Newsgroups: sci.electronics
Subject: Re: Sony TV Hi-Pitch squeal
Message-ID: <1991Jun3.163755.825@hubcap.clemson.edu>
Date: 3 Jun 91 16:37:55 GMT
References: <6298@ns-mx.uiowa.edu> <1991Jun3.150425.4892@news.larc.nasa.gov>
Distribution: usa
Organization: Clemson University
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A high pitched squal is a common aging problem in electronics.  The past two
TV's I have owned have had that problem but they lasted closer to 5 years.
I researched the problem (i'm an Electrical Engineer).  My TV is solid state so
I only researched solid state and will only comment on those.  Every solid state TV has a little transistor (little as in microchips) which serves to prevent this squal.  The squal occurrs when, over time, the transistor burns out and no longer functions.  You are correct in saying it is the verticle sweep but you can not stop the verticle sweep oscillation (and still have a picture).  So, the    
remedy...  buy a new TV.  It is cheeper to replace than fix (usually).
Disclaimer.... this all based on the idea that your high pitched squal is the same as my high pitched squael (notice I can't spel squael, squeele, or whatever)
Jim Lysaght