I have two minutes before I head home, but I didn't see any common issues for that model, so it may just be an end of life issue. You may have just gotten all the life out of it that you can. It's not going to be worth much, but you can try to sell it on cl for someone for parts.
A little piece of advice - do not ever buy a Mitsubishi TV again. Or a Dynex, or any other crap brand. Samsung, LG, Panasonic are some of the top ones you do want to buy. I will check on this thread tomorow.