Chosen Solution
I bought another nexus 6p from ebay that only said that it wouldn’t turn on at all. I swapped the screen with the digitizer into my phone because I had recently broken my screen and damaged the digitizer trying to take the phone apart to replace the battery. I’ve got it all back together now with a new battery and the new screen and digitizer and it boots and shows the google logo and then asks for my pin code but won’t register any of my touch inputs. Completely unresponsive. Am I screwed? I took it apart again and disconnected the cables and reconnected them but same thing.
Was the screen removed from it’s screen frame from the replacement 6P you bought from eBay to the other screen frame? Or was the logic board just swapped from one board to another? The best way to go about this is to swap the logic boards as this is the quickest way and does not require removing or transferring any other parts such as the charging port, battery or the screen from their respective screen frames.