Chosen Solution
Currently have a Samsung 75in TV (QN75Q7FNAF), but it seems to have a power cycling issue I believe, it turns on and off repeatedly and stays on like a min or two but no display. It makes a sound when starting up when you click a button on the samsung remote but nothing else. I think the backlights are fine cuz you can kinda see it working when its powered on. I haven’t tried replacing the mainboard/power supply, but could replacing one of those fix the issue? I think it would be more likely the mainboard but not entirely sure or could it be a cable that malfunctioned?
@technoob231 … i would start by removing the mainboard connector from the power supply. see if your set powers up and stays on with backlights lit. if it does, you can move on to other boards. if it doesnt, start troubleshooting the backlights and power supply. ensure that the power supply is giving proper voltages at the connector leading to the mainboard. they should be steady and not jumping around. post back with your results for any additional assistance.
TMc798 @technoob231 I do have the same issue here. From what I can read from your situation, your panel could be ok and you might want to change the T-Con which might be unable to drive both working side at the same time. That’s just my impression because I’m no electronics. Best regards,
