Originally Posted by drsyme2
So none of the inputs on the back of the TV work, but the one on the front does. Does that mean anything?
The inputs on the front are composite too, right? The fact that the composite 480 inputs work some of the time and pretty much nothing else works points to the formatter board, the one with all the connectors on it, or the power supply that feeds it. The 480 composite input requires the least processing, if any, to put up a picture, ie it is most likely to be the last surviving function of a bad board.
The power supply however does seem to be feeding the main board and the light engine okay, pointing back to the formatter board.
Your main board, the DM, appears okay because you get bootup, menu, basic remote functions, etc.
Even when you get a bad picture on the composite front input, I suspect you still get a good menu display. Your light engine appears to be good, as well as the ballast.
There's no simple test I can think of that will absolutely condemn the formatter board though, so I don't know if you want to look for one on your own or not. The advantage a repair guy has in a case like this is that he can shotgun it with both a power supply and a formatter board. On the other hand, RCA is not that good about keeping spart parts in stock.