Hi Lunatic1120 and welcome to the forums. 
I’m not sure but from the description you’ve given it could be that the backlight has failed.
Something like that can be relatively cheap to repair depending on what type of backlighting is used but unless you’ve the appropriate skills it might be best to hand it over to a TV engineer both to confirm what the problem is and give you an estimate to see if it’s a cost effective repair.
[B]Wombler[/B]