Tv screen goes black, has sound,

Michael Hickmott this "go to snow the come straight back, today the tv screen had a brief flicker then went black" while not seeing anything on the screen can be an issue with either the main board or the T-con board. Of course, first try a reset. Disconnect everything that is plugged Tinto your TV. That includes cables box/SAT box/ Firestick etc. Then lastly unplug the TV. Hold the power button down for about a minute. After that connect one video input source. I prefer a local one like a DVD/BR or game console. Then plug the TV in and see if it works as should. If not, it's time to take the back cover off and to take a look at the boards. Check for obvious damaged components (charred, missing or otherwise odd-looking components) on those boards. If needed, we can try and assist you further with this, but we will need to see the boards. Post some good pictures of the boards with your QUESTION. Use this guide Adding images to an existing question - iFixit Repair Guide for that. That way we can see what you see.