Samsung WF45H6300AW/A2 Spin problem

[mmmdaddy]

The motor rotates back and forth very fast while doing a spin test.  It caused the rotor to wear out the plastic around the center hub.  I replaced that and installed a new rotor position sensor.  I then called a tech from APP and he suggusted I replace the control board.  That didn't work.  I tried a known good motor inverter board to no avail.  I checked the wiring to all those mentioned and the vibration sensor.  I am at my wits end.  Help!