Recurboy Display not working

Maybe I missed something very obvious. These are just a few components, so I think there should not so many things which could be wrong. My assumption is, that due to the fact that the ADC is not installed, the init routine from the display stucks.
The backlight is working. I measured all the pins to the display, and all of them have proper connection

Am I right, the display should work as soon as the raspberry has booted, or? Or is there something else what I have to do?

Sw is v2.1
I tried also different PIs