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Re: RCA F36TF720YX2 TV
The squeal maybe produced by the flyback, It looks like is a common defect on this chassis, but check any other defective part in the horizontal section and the power supply as well.
The fly back part # is 257805 but i would call RCA just to verify it or you can check inside the Tv's lid for that part number.
Check globalsemi.com website.
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if its a hi pitched whine it could be the horizontal output xfmr make sure all solder joints around the xfmr are solid and the xfmr mounts are tight it sounds as if your hearing the 15,750 hz. horiz. signal
Yes + replace the Horiz output transistor = part # 237470.
Then adjust screen control on new IHVT to same position as
original........ + or - a little bit OK. Then reset focus as needed..
Let me know how it goes.....................T.
some electronic components inside your TV had shorted out! you might be hearing a slight CHIRPING! like the sound of crickets! or maybe whining! the sound migth be coming from the transformer/inductor with a shorted component on its output!