I would suggest verifying motor operation using diagnostics. The tech sheet should be under the top panel and behind the control panel. If it is not there, here is the sequence to get into the cycle. When done, input the keys again to exit the cycle.
Press power button to clear any current cycles.
Note: The display must be blank to proceed.
Disconnect the power for 30 seconds.
Reconnect power and within 30 seconds of
reconnecting power:
Press signal button.
Press delay start button.
Press signal button.
Press delay start button. (The door will lock,
then will display t01.)
Turn the knob until T10 is in the display and press start. The basket should tumble each way. Press start again, then turn the knob until T14 shows and press start. This will advance through the spin speeds and show their RPM in the display. If it still doesn't work, then I would suspect the inverter board as the failure. If it does, then the main control would be more logical.