Do a search for "Home Theater Spot", it's a forum where I found a lot of info on TV's. I know my rear projection TV had a couple of adjustments that had to do before the convergence adjustment.
One thing I would do is clean the lenses and mirror. If the mirror is dusty it will really screw with the picture. Just be aware they use first surface mirrors which means the coating is on the front side of the glass and easily scratched. Be gentle and use toilet paper on some other soft wipe to clean the mirror.