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Tv won’t power on and screen flickers between blue and black

Model Un70tu700df was not a choice, so I am putting it here. When I turn this tv on, a dark blue screen shows, then it turns black and the tv appears to turn off. Then, the red light blinks a few times and the dark blue screen turns on, then turns black. It will continue to cycle like this until I turn the tv off. If I turn it back on, the blue/black cycle starts again

I have unplugged it, held the power button for 60 seconds, unplugged everything attached to it, but is still cycles blue/black. Any thoughts?

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Hi all, model UE50MU6120k I have the same issue as above, removed the back panel powered on i can see lights power on through the holes in the metal casing. Light stay on foe 2 seconds or so then go dim for 2 seconds the brighter for 2 seconds the appear to power off or rest for around 10 seconds. Any help please cheers

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@humbug the dark blue light etc. sounds like the backlight. I would start by unplug the TV by the power board and remove the back panel. Now unplug the cable from the power board to the main board. Then plug the power cord back into the power board. Do you see your backlight coming on through the little holes in the sheetmetal of the LCD panel?

If yes, then we know the issue is not a backlight and Samsung considers this a test for the power supply. Next you want to unplug the set again. Reconnect the main board. Connect the power back to your TV and turn it on. The you need a multimeter and measure the voltages on the connector for the main board cable. The expected voltages are printed on the board. Let us know what you get on those.

Also, take some good pictures of your boards and the complete backside of the TV. Post thoise with your Question. that will allow us to see what you see. It puts us all on the same page in the same book :-)

My suspicion right now, is a bad main board. It is your main board that tells the power board what to turn on. It tells the LCD panel when and what to display where. All very simplified of course. For now, just a suspicion and we need to check things out.

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After researching the model and serial number, we realized that the tv is still under warranty. A repair person is on the way.

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Hi oldturkey03 coukd you please help me out

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Hi oldturkey03.

Could you please help me out. I have the same issue as the other user but I'm out of warranty. I'm new to this site so bare with me. I have taken the back off the t.v and unplugged the power from the main board and the back lights are on. Not sure on the multi meter reading as I haven't tried that. Is there anything else to try or do you suggest replacing the main board?

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Same issue here no warranty Samsung wants $250 to look at it

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@dalindamefford what model and exactly what symptoms does it have? What have you checked?

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Humbug will be eternally grateful.
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