OK...wow, it looks like it may finally be my turn!
We were watching a recorded show, and noticed the set was alternately dimming slightly and then going back to normal brightness, then dimming again and the back to normal.
Did it consistently for several minutes while we watched.
So I turned it off, put in my spare bulb/housing, and hit the button to turn it back on, only it wouldn't turn on.
Tried w/three remotes, power button on the side of the TV, dead.
Put other bulb/housing back in, still no go.
Put backup bulb/housing back in, still no go. No noise, no click, no nothing, just sits there dead.
It has been running flawlessly until today since I got it, so I'm thinking something big blew on the main board/power supply...
So - likely need to think about replacing main board, or power supply?
Appreciate any troubleshooting suggestions...I'm letting it sit to cool off right now, and will try again later to see if it powers up. Some months ago I cleared out accumulated dust, etc., so it shouldn't be too dirty/dusty inside.
Maybe time to move on, but it has worked so well, picture is still amazing...