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I've seen a lot of flyback transformers that produced a high pitched sound. Often, the problem is due to a loose core or a flyback that's not properly seated on the board. You might try resoldering the flyback. If you find out that it's a loose core, you may be able to use silicone to make it more secure. A squealing flyback will usually continue to work other than making an annoying sound.
The sound problem could be anything from bad caps in the audio circuit to a mis-aligned audio stage.
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