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Sounds like a problem I had with a Polaroid t.v. Take the cover off the back and look for capactors that are buldging on the top. The top should be slightly concave. If they are convex at all, you can buy new one at Radio Shack and replace them for under $5.00
Try bypassing the set's speaker by running an external audio amp. I use my bookcase stereo for audio direct from the satellite receiver and turn the volume off on the TV. Sounds better this way! Could be the audio amp in the TV is going bad or the speaker may be bad and the TV's audio amp goes through a shut down cycle.
Your set is shorted circuit condition. The power supply is making the noise. Unfortunately almost any of the hi current circuits will do this. If picture went out 1st look for video or hi voltage problems.
That is a CTC203 chassis that is VERY difficult to estimate without seeing it... The "squeal" symptom you described indicates that the HOT (horizontal output transistor) has shorted. (Q14401 RCA p/n#242224 (2sd2578)). But I would not stop there... Check also: Q14101 RCA p/n#244223, R14107 p/n#244214 (43 Ohm 1/4 Watt) and really go over the underside of the board for poor solder connections.
Tri State Module can rebuild that board to like new for $100.00 dollars plus shipping. and even if a shop locally did the teardown and re-assembly that's a lot cheaper than the cost of a new TV of comaprable value.
Hope this helps!
The set is what we call squealing because the power supply is sensing a problem and is screaming for help but that could be a good sound for a technician to find the problem fast and correct it inexpensebly.Keep it unplug to prevent more damage.