Model number is lg 55ln5790. The screen comes back on if I turn the tv off and then back on.
First thing you need to do is the flashlight test to see if you still have video and no backlights..If you don't have video then its either the Tcon board of main, I would lean more towards the Tcon of the 2...if you see an image with the flashlight then you have issues with the backlight, your TV is an LED type so it could be bad lamps in the panel or you have lost power to the lamps, this TV you have is known for bad lamps in the panel and I'd guess thats where your issue is at. Also your TV does not have a controller board so that was a wrong answer.
Testimonial: "Thanks Larry, your flashlight test worked. It was the back lights. I ordered new back lights and fixed my TV. Thanks so much for the helpful advice."
Most probably a faulty controller board
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