Can you please share where abouts on the scooter the circuit board you mentioned is located.
I'm having a similar problem with mine and cannot find the board. I've taken the panel where the charge pin is located but can't seem to see a board underneath.
I find mine only turns off when fully braking if the battery if fully charged when i try to brake......
In my head its because theres nowhere for the "regen" power to go if the battery is fully charged. But i'm not electrical engineer.