pCP3.22 + Waveshare 3.5 + Justboom Amp Zero

Hello,

I whant to build a small a Bathroom Wifi Radio with an Raspberry Pi 3 + pCP3.22 + Waveshare 3.5 + Justboom Amp Zero.

The following Configurations are still running pretty well :

Config 1:
Raspberry Pi 3 + pCP3.22 + Waveshare 3.5 + Jivelite
I have usesd the Instructions fromnowhinjing
(Thanks to fromnowhinjing)

Config 2:
Raspberry Pi 3 + pCP3.22 + Justboom Zero AMP


Now I whant to combine the Configurations. I use a Stacking Header to put the Waveshare TFT on the Justboom Amp.
But it didn't work :confused:

I think it is a GPIO problem...

Usually, the amplifier should use the following pins:
PIN 1 - PIN 2 - PIN 3 - PIN 4 - PIN 5 - PIN 12 - PIN 17 - PIN 35 - PIN 40

optional:
PIN 16 Rotary
PIN 18 Rotary
PIN 21 Rotary

and the TFT should use:

PIN 2 - PIN 14 - PIN 18 - PIN 19 - PIN 22 - PIN 23 - PIN 24 - PIN 25


Could PIN 18 make the Problem ? According to the Justboom specs. the PIN18 is Optional. Is it possible to disable the Rotary support and is that my solution?

Sorry for my bad Enlish ;)

Thanks,

Horst