I bought my DLP (HLP6163W) in 2003 (it is out of warranty now) and I got the dreaded three flashing lights and so bought a new lamp and set that up and everything was working fine for about 15 days and then two days ago while watching cable the screen turned blank (black).
The TV is on (like watching a dark room with very little light in a movie) as I can see a glow throughout the screen so I presume that the lamp is still working, there are no lights (led's) flashing or on in the front on the TV, I can also hear the fans working so I am not sure what's going on.
Based on the recomendation of Barry Watzman from here I opened the back and cleaned it with a can of compressed air but still no change.