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do me a favor, if the set is still together, please remove the back, and find the convergence card... it is on the upper right hand side. Unplug the RED plastic plug ONLY. Now try to turn on the TV. If it turns on, but the picture looks completely out of convergence, then yo uneed to replace the 2 STK392-040 IC's and you will have to test all of the 3.9 ohm resistors on the board. You will usually find 1 or 2 bad. let me know what you find.
I had what may have been a similar problem and even talked to Westinghouse to see what I was doing wrong. Woman suggested there was a problem with the audio output port and suggested I exchange tv for another one. When the new one had the same problem, I discovered that to get audio out requires the volume to be turned way up on the tv (set speaker preference to external only if you don't want sound from tv speakers as well). If you have a digital optical connection on both the tv and the home theater, the sound output is independent from the tv setting and is easier to work with.