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Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/
Cost for repair and the part isn't worth it old chap, especially when the holidays are coming around the corner and retailers are hurting for business. Why not get a lighter LCD or plasma tele with better 1080 resolution then stress over trying to save this old dog? Off to the heap with it is what I say.
I have a KV-27V55 and when I turn the TV on the picture and sound is good for about 30 minutes and then the picture goes off, but the sound is still on. It will come back on after a while. What do I do?