If its a DLP with a high pitched or even fan like sound it is the color wheel--Mitsubishi does not sell them as a part---you would have to replace the entire light engine (expensive and may not be available any more on a older set) .
SOURCE: mitsubishi wd-73736 bulbs buzzing noise
The Ballast that ignites the Lamp could cause the Lamp to fail and/or cause a buzzing noise. That being said, the Color Wheel in the Optical Block assembly could also cause a similar symptom. If Mitsubishi would be willing to help with the Lamp cost, I would call a local Mitsubishi repair facility to install it and see if the noise is still there and find out exactly what is causing it. Mitsubishi Customer Service Phone number is 1800-332-2119.
I hope this helps,
Skyassoc
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