No picture but backlight running

I got this broken TV from a friend who suspect it broke from a lighting strike but not too sure. When i first plugged it in it started and turned on. It would show picture and everything but when you used the remote and selected or moved to different pages or menus it would completely kill the backlight like it was drawing to much current or something, going back or the another menu would make come back as if nothing had happen. This med me think that there was a problem with T-Con Board, i removed it had a look at it then put it back. After doing that the TV all out sudden worked flawlessly except for the internal speakers, no big deal i used the TV with a Bluetooth speaker and watched something to test it for a couple of hours after about 3 hours it completely died. Restarted it and the only thing that happens is that after plugin it in the backlight fires up but no picture and not even the indicator light works. The only thing a noticed when i tested it while it was working was that the CPU and the chips on the T-Con Board was maybe a tad bit on the hot side, but I'm not to sure how hot they should be.

The only thing a can think is broken is power board but i need further assistance to find the fault, what is the next thing to check any specific voltages to check?

TLDR: No picture (not even the logo), [s] backlight starts running by it self after plugin in [s] *not anymore, bad Power Supply Board?

****UPDATE***
Now i don't get anything when pluging it in (no backlight, no indicator etc.), used AI to help me and guide me through the fault finding process, it thinks its the PSU as i get a high PSU_ON signal even when i haven't pushed the power button and still no 12v. Found this service manual.