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Samsung 65-inch 2160P TV. Released in 2015.

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Samsung TV turns off & on continuously

Samsung - 65" Class (64.5" Diag.) - LED - 2160p - Smart - 4K Ultra HD TV - with High Dynamic

Model # UN65KS8000FXZA

tv Screen Turns On & OFF continuously. Stays on for less than a second.

need help identifying the problem and possible solutions.

I already unplugged for 30 seconds; 1 hour; 24 hours; Several months now.

  • Dust? Dust inside tv compartment… issue developed during house renovations / construction.
  • burned out LED bulbs? Television was a workhorse.
  • Firmware? If so, how do I install updated firmware if I cannot access/see tv menu. Black screen. USB?
  • should I repair Samsung 65 inch Tv or replace it?

Thank you

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Здравствуйте у меня такая же проблема телевизор включается и выключается на 1 сёк, точь в точь как на видео.

Я купил 2 новые платы материнскую и плату питания поставил но ничего не поменялось. В этом случае в чем может быть проблема если ставлю новые платы?


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Hi @robert818 ,

Given the short time that the screen stays on it would be difficult to check if there were still an image there when the screen turned off because of a backlight problem.

Check to see if it is in the backlight circuit.

Disconnect the power from the TV and then remove the back cover and disconnect the cable that runs between the power board and the mainboard.

Reconnect the power to the TV and turn on the TV.

The backlights should come on and stay on.

There will be no picture because the mainboard has been disconnected.

If the backlights are blinking on and off, it may pay to invest in a backlight tester - example only so that it can be determined whether the problem is in the power board or the backlights. If it is in the LED backlight strips then the tester will help to narrow it down to where exactly once access to the LEDs is possible. There are plenty of videos on YouTube that show how to use a TV LED backlight tester.

You could use a DMM to check the voltage at the LED connector on the powerboard but the voltage may just go from normal operating voltage (~80-120V DC) to high voltage (>200V DC) if there is an open circuit in the LED strips. If it goes from operating voltage to <30V DC then it will be the power board. It may be too quick to get a true reading of what is happening on the meter

I’m not quite sure of the exact voltages but the principle will be the same i.e. operating voltage/high voltage - LED strips, operating voltage/low voltage - power board

More likely it will be in the backlights (faulty LED or connection to a strip) but it might be prudent to know this for sure before dismantling the TV to gain access to the LED strips.

if the backlights stay on it could be a mainboard problem

My view is that it is always better to repair if possible and economically viable if only to reduce the amount of e-waste going to landfill.

If you do decide to get a new TV advertise the TV as faulty good for parts to recoup some of the cost towards a new TV.

Working panels especially i.e. not cracked are always in demand as are boards and no doubt it will be snapped up by someone willing to fix it

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Hey @jayeff... We have this same TV (Samsung UN65KS8000FXZA), where there is no picture and the backlight flickers on and off, when powered up. I followed your initial suggestion of disconnecting the cable running from the power board to the main board. The backlight now stays on. What now? Do you know how to troubleshoot the mainboard, too? I would like to diagnose and repair the main board, instead of buying a new one, if possible. Thank you in advance!

Alex D.

Alcoa, TN



With the backlights on i.e. mainboard disconnected from the power board, measure the voltages on the power board connector where the mainboard cable was connected to and check if they are as shown in a table printed on the power board close to the connector.

If those voltages are not as shown then there is a problem with the power board.

If they are all OK then unfortunately I can't help as I would need the schematic of the mainboardto help with further testing and they're not available (or at least I can't find them)


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Robert sera éternellement reconnaissant.
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