This one absolutely fits,
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This review is from: Electrified 915P049020 Replacement Lamp with Housing for Mitsubishi TVs - 150 Day Electrified Warranty (Electronics)
This replacement is a perfect plug and play compatible match for the Mitsubishi model WD-65831 DLP.
DLP's require that the owner anticipates bulb replacement. Our WD-65831 requires a new projector bulb about every year. If you own a DLP, you will need to plan on a replacement bulb just like one anticipates the burned out bulb in an office projector. Keep an extra in reserve. If you notice that the image starts to dim on the TV, bulb replacement is near. The bulbs can also suddenly blowout with a high voltage arc contained within the fire proof housing. The lamp for large format DLP's demands significant voltage. You should note that the TV has a power kill switch built into the access plate to insure the plate is replaced before the bulb can be energized.
Bulb module replacement has been a nightmare for this Mitsubishi model. There is the slightest difference in the mechanical mating of a replacement module to TV among advertised/specified replacements. Several replacements are advertised as a fit for this model but none have connected until this replacement. Prior to this unit, I had found no housing replacement fit at all ... 4 bulbs expired in the original housing. This one curiously has a red paint dot highlighting the fit key. I've previously had to transfer the bulb to the original housing on every occasion and it is patience wracking requires a third hand.
This replacement works!
... now it's time to get a 65" LCD
It died after 31 days. Peculiar. DOA I might understand. Burn out after infant mortality is rare. The bulb was an Osram. Amazon made good on the return.
The TV has always been prone to bulb blow after brown-outs with transient spikes that degrade the 850w filament. I have high $$$ voltage protection but no APU able to sustain the TV's current draw. I've replaced at least 5-6 bulbs and suspected that sooner or later a catastrophic blow-up would blow glass through the internal fan and optics. That's exactly what happened this time. I've declared Mitsubishi 65" DLP dead. I'm done with this early generation 'big screen' technology. The LCD/LED/Plasma options for a true 65" replacement that I built the hole around is problematic with the new external sizes. The 60" class is too small, the 70" class is too big for now.