I have measured VS = 209V, VA = 58, VSC = -185, VE = 99. These are the values shown on the sticker, but VE is not on my sticker.
I can get into the service menu. I ran through all the test patterns. MSTAR and Logic.

The system is not always shutting down, so something must be marginal. For instance, I ran the service test patterns in the diagonal scrolling grayscale for 15mins without issue.

Set was manufactured in 2012. I'm trying to diagnose where the problem is. I am assuming it is over-currenting after heating up? Display looks fine until it decides to shutdown. If I keep turning it on, it will eventually refuse to power up and requires unplugging to get it to respond again.

I originally thought there would be some easily detected bad electrolytic capacitors, but I don't see the telltale signs. There might be some very minimal bulging on one of the x buffer board. BN96-22092A (LJ92-01852A).

If I unplug the power feed to the X/Y board (LJ92-01854B), the...

Hello. Just an old sage seeking new knowledge... And consummate cheap-a$$, so I try to fix everything ...