Mitsubishi Big screen 52" (projection) Screen black?

I have an older projection tv (details listed below) that wont work, well better put the screen doesn't work, the sound is still working. Its kinda big and not worth a whole lot, but would be nice in my bedroom & for the kids when it gets to about 4th or 5th running of the latest rental in 2 days. I can build and fix computers but honestly i have never even had the cover off of any tv before so any help on this would keep me from tossing what is now a very large nightstand. Thanks JS joe4chiefs@comcast.net

**The screen went out slowly, going black at shorter intervals over time, until nothing.
Mistubishi Big Screen TV Model#VS-5041