My hypothesis is that this is a widespread problem because Tesla went from replacing displays to keep customers happy to stopping all replacement of displays no matter how bad they were (and mine was the worst my service center had ever seen - see pic below).
I think this change of direction occurred because the scale of the problem skyrocketed once news of it spread. Conversely, it is possible Tesla did not know the replacement screens might also yellow and stopped replacement once this became known, but I think this is less likely. Why go through all of the trouble of developing a complex UV light fix that may or may not work long term when you can just fix a few cars with bad displays by dropping in whatever display is being used in new cars rolling off the production line; that is assuming the problem is not widespread and new cars do not have this problem.
Additional evidence for my little hypothesis is that all of the people I know who have Tesla S/X cars 2016-2018 have yellow screens. Granted my statistical sample is puny, but still what are the odds of that unless it is widespread?
So color me hopeful [sigh] but also very skeptical that this UV Fix: (a) will work on all displays no matter how bad the yellowing, (b) that the fix is permanent, and (c) that the fix will not have unintended negative side effects like weakening the adhesive resulting the touch-panel falling off
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