Pioneer PRO-710HD 64" Rear Projection Television "brightness always poping" Questions

...poping and going off for a while but it always came back on with a loud pop after a few minutes. It hasn't done that in a while but the picture is almost so dark it is un watchable. The trimpots on ...

...brightness would go all wonky and stay bad for several minutes+. Just recently it went pop, and went dead. When turned off at the hard switch and turned back on, it would make the relays click but ...