Could you share the schematics of the control board? The control board came along with the desktop cnc I bought from a vendor. Unfortunately, the nano board got broken and I had to replace it. I don't know the pin positions, so I did the best I could.
The problem is that only one set of pins to connect Stepper motor work. That is, I can plug any steper motor in one particular port, and it would work. Stepper motors connected to other pins/ports don' work.
It is the left-most port on the board. And it only works on passing a G-code for Y-axis. Passing G-code for X & Z axes only make a very mild buzzing sound, but don't vibrate or work.