Hello. I have a PTV835, M/N 9P5034 C103, S/N 55563158. The tv has a high pitched ringing after being on for a while. Turn it off during commercials, Turn it back on and it stops for 5-10 minutes. Then starts again. Also the picture is getting alot of red. Tried adjusting tint and contrast and that. Doesn't seem to help much. 52 inch screen, 9 years old. Hate to get rid of it. Any help would be appreciated. Thanks, AJ