Kossel 2020 with Marlin firmware loaded - LCD screen and controls don't work

Hi all,

Thanks to your help, I've finally been able to print a calibration pattern.

I have to print from my computer using Repetier. This is because since I loaded the Marlin firmware, the LCD screen shows a blank screen.
What do I need to do to make the screen work again? This also means the button to control and load the SD card files also does not do anything. I did a file compare and the configuration files look very similar.

It would be helpful to attach your configuration.h
-Olaf

Here is the configuration.h

I've uploaded all my code on github in case you want to see all the files
[github.com]

//#define REPRAP_DISCOUNT_SMART_CONTROLLER

You haven´t defined any LCD controller.
-Olaf

Thank you! that was it. I got confused by the "discount" tag.