Got a 75s425-75” 4K Roku HDTV Four months ago and while watching tv the screen went black while sound was still playing. We unplugged and plugged back in, we used the so called factory reset (hit the home button 5 times, up arrow once, rewind twice and forward twice) we can tell it rebooted but nothing changed.
When unplugged and plugged back in the screen showed the red Roku background for a split second but it was out immediately, it was more like a flash. This Tv is only 4 months old. I submitted the problem on the Roku website with a copy of my receipt, they say expect a response within 48 hours. I purchased it at Nebraska furniture in Dallas, Tx area.