I’m almost done with my first Zynthian build, but having an issue with the MHS35 screen that I had lying around.
I have successfully gotten the display to work with a RPi 4 and the Hifiberry DAC ADC pro. Display, touch, audio out, and USB MIDI all work. However, when I added the official Zynthian Basic Kit V2 the screen won’t work. Fearing I built the Basic Kit wrong, I connected everything to a RasPad v3 to verify. All the encoders, plus the amazingly clicky CherryMX switches I added in place of the Zynscreen buttons, worked perfectly. I haven’t yet wired up the MIDI din ports, so haven’t tested those.
The problem appears to be related to connecting the screen via a cable. I have tried the ribbon cable that came with the Basic Kit as well as a metric shit-ton (technical term) of jumper cables. Neither scenario works. In fact, both cause the Pi to hang on boot.
Because I care not whether I fry this screen, I have tried attaching it to the ribbon cable in both directions. Good news! It didn’t fry anything, but clearly only gets power in one direction.
Zynthian Configuration.pdf (38.9 KB)
Any ideas before I try to solve this problem with money?