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1st thing, call Sony. If they won't do anything, check the connections for the panel which is usually just a big ribbon cable and the a separate power connector or 2, clean the contacts. If everything checks out then it will be hard to determine if it is your panel or the board (TPMS Chip?) without another one just like it.
I have watched 2 DLP TV's die. My Samsung (first thing I ever bought on credit) and a Sony I found at the dump. They both had bad DLP chips, the Samsung had it replaced once under recall. We just bought a Samsung LCD, we shall see how long that lasts. It's a nice looking TV even on my dated sources.
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