running fine for sometime then suddenly just goes pitch black

running fine for sometime then suddenly just goes pitch black

Hi there I have and LG55LB700V-ZG, similar dark screen issues however mine will be running fine for sometimes a few days then suddenly just goes almost pitch black if you get close the image is faint sound is perfect…if I turn it off and back on can sometimes be fine for 20 mins or so and happens again and happens more and more frequently until I leave it alone for a while

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