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Hi you did not include the full model number but i assume it is a DPL projection TV?
If so, those can be expensive to fix as it require a DMD chip change (the one containing the micro mirrors) or the whole light engine.
DLP TV all suffer those eventually, especially those with a color wheel as it make the chip overwork. These days you can have LCD TV of the same size and more and they are lot more reliable.
You can also call Mitsubishi at(###) ###-####and ask them about recall and lawsuit with that kind of technology. They should give you a free repair with new replacement DMD chip or give you a check to compensate.