High Sierra's External Display bug heats Macbook's, damaged my Retina Screen, what can I do? After installing High Sierra, I noticed GPU related slowness, I initially sought help here: What could cause a cumulative slowness that manifests itself as high WindowServer CPU usage in High Sierra? - But later on stumbled onto this: https://discussions.apple.com/thread/8150105 and easily verified that the issue is related to external displays

Before an external display is connected, the GPU temp is around 55C under use, immediately after an external display is connected, the temperature jumps to 75-80C's (no apps used)

Very recently, I noticed this darkening on my Retina screen, I deduct it's a side effect of the constantly hot temperatures: https://imgur.com/a/Q6bnz



Ironically it's been 3 weeks since my warranty expired

On one hand, I want to solve the technical issue, preferably without re-installing the OS

On the other hand, the hardware damage is pretty saddening, but I'm guessing nothing can be done about it since the issue is assumably not widespread
The “stadium lighting” you show is usually a backlight issue where the voltage or lamps are not to spec. 

It’s highly unlikely that a thermal situation would cause that, but I don’t want to say there’s no chance or you’re wrong unless I could examine the whole Mac.

100C on many internal parts is just fine, so your reported ranges don’t seem at all out of line - especially on 2016 and newer MacBook Pro.