Hello.For half a year I experience the same problem with the TV. Periodically, horizontal lines appear on the screen. Lines can intensify for day or two, and then suddenly disappear for 3-4 months. But recently the situation has become worse and now the image is fading to black, sometimes for a couple of seconds, sometimes for a couple of days. LEDs are is still working,but there is no picture from any source and no lines too 
Last time it was 2 month of black screen, than its came back to normal and now working just fine. Primary diagnostics revealed no obvious problems with the power supply. Perhaps a problem with the screen itself? Or maybe this a faulty tcon-main board?
https://youtu.be/uo66GFiBUtk
https://youtu.be/wxb_WU1K0-s
Last time it was 2 month of black screen, than its came back to normal and now working just fine. Primary diagnostics revealed no obvious problems with the power supply. Perhaps a problem with the screen itself? Or maybe this a faulty tcon-main board? https://youtu.be/uo66GFiBUtk
https://youtu.be/wxb_WU1K0-s
Attached Files