Q7FN 55" Green tint on screen

The problem may be that the white ribbon cable inside the TV is dirty (oxidation and dust). The fix ... wipe down and clean the connecting points. Clean away any dust, dirt, and oxidation. Consider disconnecting and cleaning any other ribbon cables inside your Q7FN.

Almost same problem on my samsung tv

Same problem

The issue seems to be a systemic problem with the display technology itself. ie, Samsung rushed something to market and its eating itself alive. Like the early SuperAMOLED displays in phones. The fix is to gather all the affected peoples together, gather your evidence, and sue Samsung as a class action (like the refrigerator owners had to do for the POS ice maker that had two settings, overflow and freeze the mechanism into a solid block, and off).

Im not sure what causes it, probably some sort of burn in of the imaging layers. I imagine its due to the near uv/hyper blue illumination pixels baking the green lcd shutters. Thats right, qled doesnt mean an actual led panel like you would assume! Another point for Samsung making trash first gen products, and outright defective appliances....

PS - anyone saying its a signal issue and to clean the cables or whatever didnt even bother looking at the images before talking out their ass. Or in other words, their morons addicted to adding their 2 cents rather than understanding the issue.