My TV too.
After the update my screen remains black. Back light is on and the TV is working. I can start Netflix, play content, hear it, adjust volume etc, but not matter what I do, I cannot get it to display a picture at all.
I have tried soft resetting by unplugging it for 30 minutes, holding the power button for 60 seconds etc. Nothing works.
It's this TV.
I can't even download a firmware to attempt a manual update.
LG 55 NanoCell™ Smart TV: 55SM8600PVA | LG South Africa
How does one fix this?