Ninebot Max G30 3-Phase Power cables shortened at controller PCB level

[dijamk]

Hello fellow users,
As many might be aware, the 3-phase power cables going between the controller and motor often fuse together and in the process the phases get shortened with another at controller level. The wheel spins freely when spun by hand when the motor is not connected to such a faulty controller but as soon as the motor is connected to this faulty controller, the wheel movement feels restricted.
My best guess here is that some of the internal components on the controller PCB get fried due to phase shortening. Any inputs on how to diagnose and troubleshoot would be appreciated.

 

[n1mbu5]

Hello fellow users,
As many might be aware, the 3-phase power cables going between the controller and motor often fuse together and in the process the phases get shortened with another at controller level. The wheel spins freely when spun by hand when the motor is not connected to such a faulty controller but as soon as the motor is connected to this faulty controller, the wheel movement feels restricted.
My best guess here is that some of the internal components on the controller PCB get fried due to phase shortening. Any inputs on how to diagnose and troubleshoot would be appreciated.

Inspect mosfet's on the pcb. One of them is broken.

 

[dijamk]

Inspect mosfet's on the pcb. One of them is broken.

tank you for the reply. is there any post or tutorial on how to do it?

 

[n1mbu5]

tank you for the reply. is there any post or tutorial on how to do it?

 

[dijamk]

thank you, this helps

 

[ph3x]

As this is a german forum, please use a translator (deepl.com, google ...) for your postings - thanks.

Nachdem die Frage beantwortet ist, mach ich hier mal zu.