I have to agree that this problem should not have been marked as "Solved", and I think the definitive conclusion -- "Yes, you have a logic board failure" -- is not justified by the facts as presented. The Catalina upgrade clearly broke the OP's TouchBar, a pattern of causation that is seen in many other posts around the 'net. The OP was exhaustive in his efforts, so the next logical step was perhaps to resort to Apple, but that's a very different thing from knowing categorically that the mainboard had failed. Also, your "solution" as marked solved nothing. I had two A1706 units with Touch issues. I battled away for over a week on both of them, trying all sorts of voodoo. I really started to believe that both machines had a hardware problem, or at the very least, an EFI firmware problem that only Apple could resolve. One of them sprang to life when I re-seated the flex cable. The other only resolved when I fresh-installed High Sierra. OP's issue was more likely to be a software one. Update (05/30/2020): It...
