One day my DLP just stopped working - 3 blinking lights. So I replaced both the bulb and the ballast. Still no joy.
In fact, the TV would eventually come on but there was no control either on the set or using the remote. It could only be turned off by unplugging it. And, when plugged in, it would immediately go into the power up cycle.
Finally, I found on this forum someone who had a similar experience and solved the problem by using a blow dryer on the DMD board. Out of ideas, I tried it (applied the heat through the silver shield covering board) and it worked. The TV worked great for 4 days. Today, we went to turn it on and it wouldn't power up. Three cycles later and the 3-blinking lights of failure it powered up and it's now working fine. I suspect it's going to start failing again.
Update: TV no longer turns on the 1st time the power button is pressed like it did 5 or 6 days ago. Now, it takes a few cycles and then it boots up and plays fine. In short, it's risky to turn it off because I don't know if the next time it will turn on.
Does anyone know what's happening?