Broken 73'' mitsubishi screen.

Broken, old tech, time for a new one, or it needs a new bulb unit. :>)

https://www.fixya.com/support/r29790007-repairing_own_television

https://www.google.com/search?q=Mitsubishi+TV+DLP+73+review

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Bad DMD chip
call Mitsubishi, they will send one to a servicer at no cost, you will only pay for labor

Contact the authorized service center for Mitssubishi. It can't be purchased from open electronic spare part market.
Electro help

over heating ,faulty electronic parts

I went through the same problem with mine started out as one ended with many Its the optical lamp board cost is $600 and some dollars for a model 73-733

73 inch no power at all I unplug the cord for a couple days plugged it back in and still no power help

Please check the cost of a new screen before you decide to buy one as the cost might be about 70% of the cost of a new TV. Also you have to be very carefully to install again with no warranty. So consider to scrap for spares and invest in a new model with added advantages and warranty.

FAULTY PAOWER SUPLLY CAPICTORS OF INVERTER BOARD ON BACK OF SCREEN

AVERAGE COST OF REPAIR £80 TO £100+

I've never seen a source for replacment LCD or plasma screens for TVs. Effectively the screen is like the chassis of a car; you can buy everything except that as a repair part.

Even if it were available, the cost of the part would be very close to the cost of an entire TV set. Your best bet is to buy the same model with a blown power supply and take that part from yours to make a whole TV.

optical block assembly going bad. repair is pretty costly. try vacuming out the fans. DO NOT USE CANNED AIR!!!! you will blow all the crud into the optical block.