LG 55UF6800-UA has sound and backlight, no picture.
I was recently watching TV and it came up with an update. Ran the update and walked away for a couple hours. I came back and the TV has sound and back light, no picture. No picture with the flashlight test. I have 13 volts at the fuse on the T-Con board, and i replaced the T-Con board but having the exact same issue. One thing i noticed is that when i first apply power to the TV, the back lights come on without hitting the power button and sometimes start flickering. If i turn it off via the power button and back on usually the flickering is gone, but still no picture. I have found if i unplug the 3 wire harness coming from the main board to the T-Con board the flickering always goes away, and starts when i plug it back in. Not 100% where to go next, if it could be the Main board or Power supply board. Also don’t know if the update had anything to do with it, or if it was a coincidence.
Looking for some help how to verify the exact issue before just throwing another board at it.