Re: Samsung ue32j5200ak bn94-08318b

when it reboots do you get a flash from the IR receiver led and then the Samsung logo of so most likely is the main pcb, you could try removing one of the two flat cables going from the toon to the panel trying left then right then out put to rule out cell failure but my money would be on the main pcb

Re: LG 60PZ570 main board failure?

For the buzzing it might not make a difference but make sure all the screws are tight especially on the earth tags. I've had similar issues in the past not as loud but not far off as for the main issue I would agree that it looks like a main pcb issue did you change the main board(with hdmiports ect on it) or pcb shown in the vid as the test patterns could be generated in either thus causing a misdiagnosis. Or I could be completely wrong but worth a punt XD