My stepper motors shake and whine but don't move I Have used my volt meter current runs through the motor, Then I tested my wires current runs good through it, I looked at my connections they look like the work, My marlin board should work Because my lcd screen works. What else could I be missing.
Could it be fried some place when I first wired it I switched the negative and positive wires then realised what I did and changed it right.
Have you replugged motor connections with the driver board powered up? That often destroys
the driver, steppers are very inductive and cause high-voltage arcing if you disconnect powered-up.
Have you set the correct current for the motor?
Have you checked the two coils are correctly connected to the driver (always use a multimeter to check
which wires connect to each winding before testing - wire colours vary from motor to motor). Bipolar
motors have two windings, call one A and the other B and connect accordingly.