I can help you out here. This may be a bad red crt(picture tube) If you see curved vertical lines across the screen then it sounds like a shorting crt. You will definetly need a Sony authorized servicer to replace the crt. Get an estimate first. After so many years it's not to uncommon for the crt's to go bad or short. Good Luck
If its a KP65WS500 you can obtain a manual at the following link along with support and probaly figure it out
http://servicemanuals.vstore.ca/
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there is a red out line on picture
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