Hi!
According to pinout.xyz there should be no conflict between the pHAT DAC and the Display-o-Tron. Did I got this right?
(I’m happy to hunt for a bad solder, but I’d rather not search in vain…)
One of the pin was out of the socket. It works alright now! :)
That’s correct, the pHAT DAC plays nice with quite a lot of boards, Unicorn HAT being one notable exception.