SOURCE: super high pitch whistle from tv, only powering it off helps.
Shut it off and unplug. You have a serious HIGH VOLTAGE problem that could cause a fire. Professional repair needed.
SOURCE: volumne very low & high pitched back round noise (sony trinitron)
Many Sony sets use a stereo processing integrated circuit (IC) that causes this problem when it goes bad. The part is an SBX-1637-11 and is available from several parts suppliers. One I use a lot is MCM, and their page for this part is here.
Changing the IC is not difficult if you have some experience working with soldering electronic parts. If you're not comfortable with the idea of doing this yourself, a TV shop could do the repair and the cost would be much less than a new set. It would definitely be worth repairing if the picture still looks good to you.
SOURCE: why does my sony trinitron makes a high pitch
It's the flyback transformer. Check for bad connections on the flyback and on horizontal output circuit.
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