@lukasv33266 , Thanks for the extra information—it was really helpful. I spoke with the team, and the issue could be anything from a transistor problem on this specific unit to a cable issue. Even if it’s just a cable issue and you can get it to work with a different one, that’s not how we designed it to function (and you deserve a friction-less user experience).
The best course of action is to issue you a replacement. You can start the process by emailing ***support@ifixit.com*** with your order number.
Let them know you spoke with Kris in Community and that we’ve determined a replacement is the best option.