TV approx 18 months now - so out of warranty, its a Samsung LED UE40D5520. When it is switched on, there is a translucent black bar across the top of the screen, it covers about a third of the height and appears to become less opaque towards the right of the screen. It lasts around 7 to 8 minutes after the TV is turned on, (oddly longer if an Unplug the TV and leave it unplugged for 30 seconds. Next, plug the TV back in, using an outlet you know works (you can test the outlet with another device, like a lamp). Please do not use a surge protector, as they may eventually wear out and stop providing the necessary voltage for your TV. This Samsung QN50Q60TAF TV keeps restarting no matter what I did but after doing some basic troubleshooting I was able to get it going just by taping the rib This new backlight technology can help boost brightness and improve contrast in LCD TVs from Hisense, LG, Samsung, Sharp, Sony, and TCL By James K. Willcox Updated April 28, 2023 .

samsung led tv backlight problems