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More sets than you might imagine have this kind of problem---I a regular TV it is usually a transformer that is vibrating hard enough to make the sound---the higher pitched sound is just that--a sound.
If this is a direct view(means not a flatscreen and has a Glass Picture tube it will be either the high voltage transformer or one of several smaller transformers.
This can usually be fixed---seen a few so loud the cats in the house run away.
Let me know model number of set for more information.
On chance it has the high voltage transformer I attach a photo of what that looks like.
If it is a high pitched whine or buzz it is likely a transformer vibrating so hard it is making the noise.
There are ways to try to deal with this issue but the set has to be opened and probed to locate where it is coming from--
for example with back off and set on a plastic rod can be used to touch areas and exert slight pressure until the sound changes or goes away--then either replace the part or I have used hot glue etc to stop it.
I had a problem like that so I disabled the tv's onboard tuner (input source)and now we use the cablebox's video and audio out to the video and video in jacks on the TV this will work as long as you have a cable box or sat reciever for your video and audio source and of course your TV must have video and audio inputs so it will work.
There are only 2 moving parts on a dlp tv the color wheel and the fan. The color wheel needs to be replaced about every 4 to 5 years. Some start to make noise and others like mine blow up with a bang. Go to utube to get instructions on how to replace it only cost me for part $100 good luck
The sound is a result of the faulty CRT base, and you will have to replace the base socket. Make sure you by the exact same type of base, and if you are not a techie, get a qualified technician, this is not a costly problem.