Mitsubishi WS-55813 menu works, but no other video/sound???

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BenP
Mitsubishi WS-55813 menu works, but no other video/sound???

I recieved this tv from a neighbor, thinking it would be an easy capacitor swap out. After replacing the capacitors, I realized that isn't the problem. In fact, it appears different than other issues I've seen in the forum. My symptoms are:

The tv turns on and after the DM starts up looks fine. I can access the menu and it shows clearly on the screen. But when I try to use any video input, I get only blue screen. The menu still work, but no video image or sound. 

I tried putting a compact flash card in to see if a digital input resolved things, but selecting the compact flash causes the whole screen to flash and lose its vertical/horizontal stability.

I am worried this may be indicative of a bad DM module. If anyone has any ideas that don't include replacing a $1k part, I'd love to know. Thanks.

   -Ben

 

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