OK, Samsung PN64F8500 mavens--here's my tale of woe. Please tell me if you can make sense of it.
We were watching the TV last week, and I reached for the TV remote to adjust the volume. As soon as I touched the remote, the screen went black--no picture, no sound--and the red LED monitoring light started to flash on and off every five seconds or so. We tried unplugging and re-plugging several times, but we just kept getting that slowly flashing LED, and attempting to turn on the TV did nothing to change that response.
I had a tech look at the TV. In phone consultation with Samsung, he tested out the X-main board and power module, and they both tested out OK, so the Samsung guy said that it must be the Y-main. I managed to find a new one on eBay a couple of days ago; earlier today, I installed it. I made some progress--with the new Y-main in place, plugging in the set produced the expected steady-state red LED; but when I powered the set on, I got the flashing that you expect during turn-on, but no picture--just endless turn-on flashing.
My assumption is that maybe when the Y-board went, it somehow took the X board with it--does this sound possible? I'm also assuming that the power module is OK, or I wouldn't be getting the steady power-off LED when the set is plugged in. I have an X board arriving tomorrow, but it's a salvaged, used one--so I have my fingers crossed.
Do you think that panel could have suddenly died all at once? This doesn't seem to make sense--doesn't panel degradation or failure usually come with some big hideous stripe on the screen, not just a black screen? Plus I was getting that weird slowly flashing LED before I changed the Y board--that is now resolved, but still no picture.
Any thoughts about what might be the problem here, and which board might be the culprit? Or could it be the panel?
I'd be grateful for any informed conjecture on this.