Given the fact the external display is working, and replacing the cable didn’t alter anything tells us the internal display logic its self is bad. Just like the MacBook Pro Apple moved the T-CON logic to sit within the main case vs the display lid. This puts it at risk either overheating or the massive number of cables now required
[image|2275375]
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Here’s the guide to replace it [https://www.ifixit.com/Guide/Retina+MacBook+2016+Display+Assembly+Replacement/97303]
Given the fact the external display is working, and replacing the cable didn’t alter anything tells us the internal display logic its self is bad. Just like the MacBook Pro Apple moved the T-CON logic to sit within the main case vs the display lid. This puts it at risk either overheating or the massive number of cables now required
[image|2275375]