XPS 13 9380 host of issues

I have an xps 13 9380 that started having some issues a while back. Mostly inconsistent power, and some of the USB-C ports would act up (one of them only worked in one orientation?), so I deduced it was the mainboard and replaced it with a refurbished one. The refurbished one worked fine, except the built in speakers wouldn't identify and the trackpad wouldn't register clicks/taps. I figured it was an issue with the refurb board, so I returned it and ordered a brand new board. Now I have that installed and am having the same issues (no built in speakers and no trackpad clicks), along with some general inconsistencies, like if I open the lid past a certain point the system just shuts off and stays in a weird state of being completely dead except the caps lock lights up while holding the power button down. All the internal display cables look visually ok. Amidst all these issues, I have obviously tried restarting it, hard reseting it, changing the CMOS, upgrading Bios and drivers, nothing seems to be fixing anything and I'm nearing my limit with what is now a very expensive paperweight.