Need a screen
Contact the authorized service center for Mitssubishi. It can't be purchased from open electronic spare part market.
Electro help
I am not sure about your model but a call to Mitsubishi to ask if the set has one or two mirrors would offer a possible explanation---the ones with two mirrors have a small one at the bottom--it gets coated with dust and brightness drops up to 75 percent----other possible reason is the lamp may be nearing the end of its life.
I would have Mitsubishi look to see if this model uses the two mirrors--if that is the case cleaning will cure this--if you find it has two mirrors I can tell you what is involved--on Vacation but do look here--let me know what you find.
SOURCE: Mitsubishi 73"DLP wd-73638 won't turn on after power outage or getting unplugged
In most cases, this can be due to curropted software [firmware]. Contact the authoriized service center for Mitsubishi. Please do not try to update the software by yourself. It is a very skilled work to this set. Gopakumar Gopalan Google
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