Have replaced Lamp and still does same thing.

Panasonic DLP TV Bulbs

Make sure its an original Osram or Philips bulb inside the housing. If its a cheap lamp it will act this way. If it is an original lamp, then you may have a power supply issue. It shouldn't affect your TV but you may want to try resetting the lamp timer by following the instructions that came with the lamp.

TY-LA1001 Timer reset

While pressing the VOL- button on the projection display, hold down the number 0 button on the remote control at the same time for more than 5 seconds.

chk this link....

http://www.techlore.com/forum/thread/19563/Pioneer-SD-533HD5-Green-light-flashes-then-back-to-standby/

Likely an AKAI DLP made actually by Samsung. All 3 lights blinking is lamp failure. You can fix yourself with owner's manual.

Is the picture quality good if it is then the lamp is ok try to reset the lamp timer if you haven't all ready. I think that the problem is coming from the ballast board this is the power source to the lamp, with time this part starts to ware out and starts to get weak. that is the reason your lamp does not stay on

Power board is bad.. I had the same issue.

I would suggest replacing the Lamp

you need to test the lamp with a ohm meter, to see if its working correctly

Most likely needs a new lamp. Easily done yourself.

Did you let the green light flash for about 70 seconds? It goes thru a self check when plugged in and takes a little time

We have the same DLP set and had the same problem. The Color Wheel, P/N BP96-00250A, a $200 part needs replacement to eliminate your problem.