I have just started having a similar issue as what this title of this thread describes. Only difference from mine and the OP's issue is that my drivers (A4988) were already connected to the my ramps 1.4 mega 2560 (MKS Gen_L V1.0) and the printer was printing fine for a while then tonight one of my Steppers started to just vibrate. Basically a back and fourth jerking movement. This stepper was my Extruder. I decided to check the stepper so I switched it with one of the axis and it did not do what it was supposed to there. When I ran the homing all the steppers moved hit the endstops dropped down then went back up like normal but then the one with the driver I switched went back don and then back up and kept trying to go up. This is on a Kossel Mini.
So I am wondering if that driver has gone bad. It just vibrates when in the extruder slot yet moves and goes crazy when in a axis slot. I went ahead and ordered a new set of A4988 drivers as the don't cost much but I just wanted inquire about the issue here as well to find out if it is indeed bad. So does it sound like the driver is just bad? I think it may be.
So I am wondering if that driver has gone bad. It just vibrates when in the extruder slot yet moves and goes crazy when in a axis slot. I went ahead and ordered a new set of A4988 drivers as the don't cost much but I just wanted inquire about the issue here as well to find out if it is indeed bad. So does it sound like the driver is just bad? I think it may be.