This is a fascinating and weird failure mode for a #CRT. Circles like that I would assume are a digital artifact, but the rainbow sheen around the perimeter of each one suggest an analog mechanism.
Ideas, anybody?
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@mkb Kid with a magnifying glass, I think. Saw some similar dots on a bus stop advertising display.
@mkb Something to do with magnets?
@mkb I think this is probably an LCD with heat damage. It can certainly look very similar, and you might think it's a CRT if it has a glass touchscreen over it?
I don't fully understand the mechanism, but heat can somehow damage the liquid crystal in a way to produce near perfect black circles. I think it's either boiling of the liquid crystal damaging it, or delamination, but am not sure.
@mkb some kind of combination of finger grime + very specific spots on a previous version of this UI + heat over time from being run presumably 24/7 in a shoestring environment?
