My samsung tv keeps turning off...

The TV may be overheating. In the old days, you could remove the rear cover and blow the dust out to fix an overheating problem. I'm not sure if that would work on the modern smart TVs.

Please provide the model number. There are a number of different possibilities based upon the model. In general, I would look for capacitors on the power board for signs of bulging at the top. This would be the simplest to see and fix. If bulged, replace them. If not, with the model number I should be able to provide some additional things to check.

My 8yr old TV was turning off and on about every 20 seconds. The red standby light and backlight were on (as seen in a dark room), but the screen was black. I removed the main (logic) board and locally slowly heated the largest chip (integrated circuit) to about 200C for a few minutes with a hot air gun (see 'reflowing mainboard' videos on youtube). On re-assembly, it all worked again.

After a few years, the solder cracks around chips that get hot ie the big chips often with heatsinks. Re-heating the solder to about melting point reseals those cracks. The job takes about 1hr and requires moderate DIY skills.

Sometimes TV's fail due to faulty bulging capacitors in the power supply board, but mine were fine as were the voltage outputs, so 'reflowing' the solder can be thought of as a last resort. If this job looks too daunting, try taking it to a repair cafe.

In my case the factory installed motherboard burned out after 3/4 yrs of use. As opposed to buying a new TV or employing Samsung repair, which seems to be the only thing the Samsung rep was interested in (samsung “consultant” wanted $200 for just coming out to assess the problem), i hired a general tv repair man. He assesed the problem quickly, ordered me a new motherboard and installed it. Total cost $300 Canadian and the picture is superior to than when i initially purchased the TV, colors both richer and deeper suggesting that the motherboard installed superior to the initial factory part motherboard. I have a much better TV for only $300 now.

I found the answer to fix this!!! Hello, my Samsung curved 55” 2017 model 4K TV was doing the same thing. The TV would turn itself on and off every five seconds nonstop. The little red LED light at the bottom of the TV was flickering really dimly nonstop as well. I bought a new power cord from Amazon that cost about eight dollars and now my TV is working as it should. I hope this helps and saves everyone a lot of money.

I have a Samsung UN55FH6003f with an overheating problem. When I plug in the TV, it works fine for about 45 minutes and then turns off and immediately turns back on. The off/on process continues but at shorter intervals. Many pieces on the main board are hot to the touch.

When I remove the back of the TV and improve air circulation the problem disappears and the TV can stay on indefinitely.

Tom

His need mother bord