Quote Originally Posted by Lodds View Post
No I never used an earth, the plug has 4 connectors and one of them is left empty (No 4)

My soldering is the best in the world and I'm wondering if there was a short in the plug on the spindle. I didn't see anything when I took it apart could that have caused the damage if it had shorted?
A good photo of the wiring and spindle plug would help, was the plug connected securely as a loose connection can be bad for the vfd.

I take it you meant (not the best) as a dry joint could also cause problems.