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Samsung 65” turns on and off black screen

Hey everyone,

Quick question for yeah. I have a 2019 Samsung 65” TV that’s having intermittent issues where screen will appear fine, then after a few minutes it will just go black, get the red dot on bottom of tv that flashes as well as the remote. Tries to cycle but won’t get picture. I took the back off, power board is fine, disconnected main board and I get back light. Tested the main board with FFC cable disconnected and light comes on good so I know it’s fine right to the main board. I tried the tape trick on the FFC cables and will get the screen to work for about an hour then it goes back to black again. I’m wondering if these are the issue as I plug them in and then the back light goes out and on again but as soon as I unplug the FFC the back light stays on and all is good. Are these FFC connections (some call them ribbons) a know issue to cause this black screen or is the main circuit board the culprit? TIA

Update (02/02/25)

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It is as samsung flat screens have this common problem most likely a bad capacitor on the power supply board. If you have any small electronics repair ability, and a soldering tools , you can remove the back off the tv and the power supply board will be a smaller board where the cord connects it ( be sure the tv is unplugged from the power outlet before removing the back ) anyway find the board inside that yhe power cord connects to feel the tops.of the capacitors with your fingers for one with its top bulging or hooved up and look at each capacitor to see if one or more has burnt places on their sides or with anything leaked out the bottom. When you find it replace the bad capacitor put it back together and try it.

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The power supply and main board are fine though I think. I’ve tested voltage and it’s getting correct voltage. What happens is the back light comes on for 2 seconds then goes off and keeps cycling. I’ve tested this issue by unplugging the power board connection from the main board and the back light stays on solid, I then plug the power board back into the main board and unplug the FFC connections from the main board and the lights stay on good. As soon as I plug the FFC connections back in though it would start cycling the lights. It’s so weird. The TV will work 100% fine for a while, then just go dark and nothing works again until you wait a while with everything off (few hours) then it comes back on again and repeats everything. Is the motherboard what gives the tv the screen?

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I do understand what you are saying. However if the power board is not carrying a load and housed up inside the caseing of the tv they may mot be getting hot.

What the problem is in some situations is that when the factories build these tvs they use capacitors and other electronic parts that are maxed out in optimal conditions. They do mot take into consideration that people set the tvs close to the wall and and in corners with less than adequate air flow, how hot peoples home may be etc. so these maxed out parts will over heat and begin to break down and ultimately fail. Radio shack has put together recap kits for individual tvs just for this type of situation.

Also the fact that your tv plays good for awhile, shuts down, takes its time and cools down then will work again for awhile etc.. sounds like the power board is shutting down and allowing itself to cool.

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@tazmaniac_37752 hmmmmm, now you got me thinking! That does make total sense when you say the power board is shutting down cause it’s to hot. So, I will look into that next. Is it pretty obvious to see something broke on that power board? Usually a broken lead? I did exam it for any little mini spark residue (like black soot) or something and it’s actually very clean!

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You will need to look at the capacitor tops especially to see if any are swollen up, and look the capacitors over for melted wrap and where some sort of liquid may have leaked out under them. There is a way to test them to some extent with a multimeter but usually a close visual inspection will yell the tell.

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