How to service brushless motor controller

You know how to repair the brushless motor controller, if you also have doubts on this question, and see it together. About this problem, we want to know, the winding brushless motor controller is not easy to bad, mostly hall element is damaged, then there is the motor controller bearing damage to oil shortage. And if it is a hall element damage wouldn't have changed, in brushless controller can be directly, if it is a rear wheel bearing problems will have to put the motor controller the pick, open the cover easily. Knowledge about how to repair the brushless motor controller, small make up it said so much, if you have questions, welcome to inquire.      Small make up: Candy