@IdahoCastleman I suspect that you made a connection where the current which is used for the steppers was routed through the board somehow, so a picture of your circuit or an image would be helpful to see whether it can be avoided with the new board. Maybe you connected the ground for step/dir and stepper, which is not necessary with the TB6600 (it's opto coupled) and you had a ground loop. But to see what could be the reason one needs more information about the wiring.