The issue must be inside of the camera, as the interface to the camera is all digital, there is no analog focus drive from the motherboard to the camera, digital image and focus sensor information gets sent to the motherboard, then the motherboard commands the camera lens to move digitally, the camera sensor then commands the lens drive motor using analog signals.
So if the image works, then it must be the software inside the motherboard or the camera sensor cannot communicate control messages properly, which suggests this is a firmware issue.