Just got a new TV today and when we turned it on only a little bit of the actual screen displayed while the rest was just blacked out. We let it sit for a bit as it looked like it was just loading the display but then the black part of the screen just started slowly turning white and we have no idea how to resolve this issue.
I would suggest exchanging or returning it. I don't know how ONN is for warranty support, but an exchange at the store is usually far quicker than any warranty work..