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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.
ANSWERS:
"@kreechur
under usual circumstances I would suggest that this is a main board issue. Since this happened after an update it is possible that this is a failed update. You already replaced the T-con board, you could go ahead and replace the main board and see if that yields any results."
I have repaired this model under warranty many times. As it was a warranty, a replacement panel was shipped. Took out boards from TV and installed them into the new panel. You Tube shows how to replace LEDs. But this can be a complete waste of time. Trust me. Thanks for asking, Matt of Martins TV Repair.
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