My sweeping robot left/right wheels won't turn, only spin in the same place, what's wrong?

This problem may be caused by the following reasons; first check if the left and right wheels are stuck by foreign substance, and if the SoCkets are loose; if only one wheel does not turn. Please exchange the SoCket to check if the machine still with the same wheel does not turn. If yes, it means the wheel does not rotate is broken and needs to be replaced. If it is not, the motherboard needs to be replaced; The robot starts with leaning to one side, stop and move again or stop after hitting a wall, indicating that the motherboard is broken and needs to be replaced.