Three hall elements = hall effect sensors. They control the commutation.
If the display blanks and the motor coasts to a stop, the over-current protection circuit is being tripped.
This is a picture of the sensors - the windings are on the other side of the board. This should show enough detail that you can trace the wires connected to the sensors to allow you to test them without opening the motor.
http://fidelisanalog.com/wp-content/uploads/sites/3/2017/09/IMG_1634.jpg
If the display blanks and the motor coasts to a stop, the over-current protection circuit is being tripped.
This is a picture of the sensors - the windings are on the other side of the board. This should show enough detail that you can trace the wires connected to the sensors to allow you to test them without opening the motor.
http://fidelisanalog.com/wp-content/uploads/sites/3/2017/09/IMG_1634.jpg