I saw damage once online that was caused by someone spraying the screen with water that then dripped downward to the connections & LED's that then (once current was applied) caused a reaction that corroded the contacts. I could see how this might look like what you're seeing depending upon what is corroded.
In any case, my first guess is that it's not fixable other than to replace the panel....and if the TV is more than a couple years old I would be inclined to have this be a replacement of the TV.
User interface engineers: Always try to think in terms of putting in "un-do"s and not confirmation dialogs on every single question! Good grief! We're STILL doing this junior level newbie nonsense in 2015?????