This high pitch wine occurs on my Samsung; I can only drown it out by cranking up the volume. If I turn down the volume on the TV, it is still there. It's like there is something vibrating inside the TV. Is this the lamp about to blow? Wondering if there is any solution?
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Check and replace its color wheel. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/
Does the squeal come from the TV cabinet or the speaker? If from the cabinet , it's most likely the Horizontal high-voltage section of the set. Find someone that's good with hand tools,unplug the set from the wall outlet, let it sit for a good 30 minutes. have someone open up the back of the set and dust out and vacuum out any dust from inside the set. Put back together and try it out.
Had the same problem. It quit within about 5 seconds after turning the TV off. Replaced the color wheel and the whine is gone. The picture also looks brighter, which may be due to dusting the projection lens with lens-cleaning compressed air (from a can). The color wheel was about $100 from Samsung parts and it took less than 3 hours to replace. See http://www.jangro.com/a/2006/07/24/samsung-dlp-replace-color-wheel/ for good info, and be sure to read the cautions.
I think its the flyback and its starting to leak. this is a component responsible for the high voltage of your tv set. always observe safety in dealing with this. Have it check by a qualified technician. Good luck!