You can try to swap the motor wires of other axes to the y-axis to see if the motor is running normally.
You can also exchange the drive board to try it out.
You can check this by doing this: http://www.geeetech.com/forum/viewtopic.php? f=17&t=17038
If there is no problem with the motor, you can check the tightness of the belt for proper adjustment;
Check if the bearing and pulley are issued (the card can be lubricated for lubrication)
I hope this can help you.
