I removed the rear wheel with the qs motor 3000w of my nyx bike bought used (2-3 years old) to replace the disc and I also removed everything that was in the frame (batteries, BMS card, wire contactor key, circuit breaker ... ) to replace the shock absorber support screws. It was necessary to take everything out to remove the batteries.
I wrote down each connection and took pictures. I then reconnected the lugs of the controller with the lugs of the display, the BMS card, battery ... everything except the engine that was not yet on the bike.
I turned the key and the display turned on indicating "HALLS" since there was no engine I think. Then I disconnected everything to rearrange the wires and leave room for those of the engine. I connected the 4 pods of the qs motor then the one with several pins. And it is by wanting to connect the red lug of the controller with the + of the batteries that it made a big spark with a "PAF"! Yet there is a circuit breaker. Actually there were 2 or 3 spark in all because I was very surprised the first time and suddenly I could not finish plugging the controller's red lug with the + batteries and I so I had to try again.
Then I decided to disconnect the big red connector of the batteries which is prolonged by the + and the - which they connect to the controller. So I was able to connect the + to the controller without problem. Then I connected the big red female connector with the male, so that the + and the - connected at the same time and there was no spark.
But after turning the key the display lighted up briefly every 2 seconds, it flashed, nothing was displayed, only the backlight.
I let rest all night all disconnected, the next day I retested. The screen was turned on this time, everything was functional as usual, BMS detected, all parameters were the same, functional engine ... Then I cut the contact with the key and I then put it back. The problem came back, the screen flashed again. I let stand 2 hours while disconnected to repeat a test, the screen still flashed. Then I let the night rest and again it worked well, but only once, as soon as I turn off and put in touch it does not work anymore.
Maybe someone have an idea ?
Maybe someone here has a controller test procedure schema ? Since it is no longer under warranty, an expert electronics friend can open it and see where the problem lies if he has the test procedure and can then change the defective component (s) would avoid sending the controller to adaptto.
Thank you for your attention.