M620/G510 burnt controller issues

[said]

Hi there, I have a burnt controller on my M620/G510 Ultra. Everything was fine, and I was enjoying my rides with it. Last October, on a local ride after a bigger bunny hopp the whole bike went dead. Pushing out of the valley and back home was a great workout with a double battery setup...
Thinking it was the controller itself, I order a new one (4 month shipping). After putting it back together and connecting all the cables, nothing happened. I then realised i forgot the display plug. UART green rounded plug. As i plugged it in, there was a little spark at the plug and a loud pop from the motor below. The result is a 2nd dead controller. It burned out exactly on the same spot where the prev. original controller.
Does anybody have or had similar issues before?
Thanks.
Said

 

["A"]

I have had my M620.G510 Ultra since APR 2021, about 800 miles ridden on it zero issues.
But it would be interesting to follow this thread and learn more details.

 

[said]

It might be that I was too hard on the bike.
This was one of my first ride with it. And I blow the shock on it at the end, I did something similar when it died.

 

[HumanPerson]

It might be that I was too hard on the bike.
This was one of my first ride with it. And I blow the shock on it at the end, I did something similar when it died.

Welcome to the forums

 

[HumanPerson]

Check any places wires could have pinched....

 

[said]

Check any places wires could have pinched....

Thanks! It is difficult with this frame and a double battery setup. I could not find anything, but I did not pull out all the way the wiring from the down tube

 

[said]

Update. I found a suspect wire. It looks too clean for me tho.

 

[ericm]

I am newer to ebike repairs. I have a G510/M620 Bafang motor, I regreased the motor and put back together and one wire pinched, I was able to start and ride it, after shutting off it wouldnt start again. I could use some advice on if you think it is just the controller or if I need to replace display or anything else same time. I dont want fry new parts by not replacing everything needed.