Sorry if this is the wrong place. I have an LCD TV that got a strange single few inch line of light burn in randomly a few years ago. The thing is, the burn in has…migrated? It’s like a good foot and a half lower than where it originally burned in. And it’s changed angle. There’s a small darker spot where it used to be, even. What’s going on? If I give my tv another 10 years will the burn in migrate off screen like it seems to be doing?
Flooded screen with white, looks like this. Top darker spot is where it was at first. 
Potentially it could also be something behind the screen. That could even explain the spot moving if there’s some sort of loose component inside the TV that has moved around over time. Pure speculation though.