Solarization.

It’s a much more common problem than many think. So, what does it look like?

There are many symptoms of this strange ailment but the most common are:

Faces on screen are blotchy as if sunburned, or a brown yellowish glow on the shiny areas.
Bright areas on the screen are tinged with a light yellow or brown.

Solarization: A phenomenon in photography in which the image recorded on a negative or on a photographic print is wholly or partially reversed in tone. (From Wikipedia)