Festool OSC 18 stopped working

[ErikNi]

Bought a OSC that did not start at first.
Spent 2 days cleaning the circuit board and coils and got the machine running again with no missounds.
Took her for a spin and after about 2 minutes it shut down and I cant get it to work again.
Took it apart again but I cant seem to fins the problem.
Rotates about 1/10 while turning the switch on.
Anything comes to mind/any ideas?

 

[niallsmart]

Haven't had this one open ... is it a brushed motor? If so the obviously the brushes are the first thing to check. If they are good, then fully test the armature. If all that checks out replace the controller?

 

[ErikNi]

Haven't had this one open ... is it a brushed motor? If so the obviously the brushes are the first thing to check. If they are good, then fully test the armature. If all that checks out replace the controller?

It's a brushless motor.
And I'm happy to inform you that I managed to find the problem and it's up and running again
If you guys end up with a broken OSC try remove the solders/soldering?
Underneath the soldering I found rust on the circuit board.
Wiped it off and that fixed it in an instant.

 

[Chainring]

Is the OSC new to you but purchased used?