I'm struggling with the above 65" TV, to be honest I'm not super familiar with TV repairs in general but the power board does seem to be giving me 12v and 19v (actually fluctuates between 18-20v).
Symptom is red standyby LED comes on, pressing power it will blink once, the second blink is brief where protect kicks in and goes back to steady red standby light.
The backlight did very briefly flash on a couple of attempts while probing voltages, I definitely wasn't shorting anything and it doesn't seem like slightly flexing the mainboard makes any difference.
...
Comment