I've been having a similar problem with a Panasonic 42" projection hdtv purchased for about $2,500 in 2003. Fortunately, I have been bearing the financial burden of the extended warranty offered by Best Buy where I bought the dog. I've renewed the warranty twice now, each time for a year versus the max three year option offered in the paperwork. The power bulb has blown out three times and the cost to me would have been over $1,300 so far, except for the warranty coverage. Annoyingly, the darn unit has to have a filter cleaned every few hundred viewing hours too, but at least I can do that myself.
However, now I find that since the unit is over 5 years old, there is no further renewable option on that warranty. Of course, the paperwork makes no mention of this fact... it only gives a one year, a two year and a three year option at a very high price. So, a $3,000 dollar "investment" is now nothing but a liability----unless I am willing to pay out $500 a year when the bulb gives out.
I;ve neither heard, nor received anything mentioning a class action suit for this particular hdtv but, boy, do I feel like a misled and abused consumer. That's the last Panasonic product I'll ever waste my hard earned money buying.