Please check whether the X-axis motor cable is connected incorrectly or loose.
Please check whether the X-axis motor adapter cable is connected incorrectly or loose.
Please check whether the pin of the X-axis motor adapter plate is bent or loose. If the pin of the X-axis motor adapter board is indeed damaged, you need to raplace a new adapter board.
For specific replacement guide, please refer to: X-axis motor adapter board replacement guide
(1) Use S2.5 allen key to remove the two screws securing the bottom plate. Then unplug the cooling fan cable and remove the bottom plate.