Have a Samsung plasma Tv. (PS50Q97HD) managed to get it working with some repairs to PWR supply board. I then added some small fans to the Y sustain and X sustain boards to improve cooling. The Tv now powers on jingle is heard but No picture or sound. Ordered a replacement S/H tested Y sustain board,fitted it green light light at bottom of board, still no picture or sound. Got a replacement S/H tested Y buffer board, fitted it ,still no picture or sound. At know time when trouble shooting and Tv turned on did I hear the high frequency sound usually emitted firing Y sustain or X sustain. Any ideas where to look or troubleshoot Thanks jason
