回答“Spring popped off after tear-down”Hey man, i just bought a wm-4 . And same thing happened. It’s the door spring. Look where the door hinge is and apply the spring in that door hinge hole and the hole next to it by the brown card. You are gonna have to figure it out how to do it. It’s pretty difficult to put back. But it’s worth it. Goodluck.
回答“The stop button is missing, music has a warble sound, help?”Shoott i don’t know thats tuff. I would have to just create something to at least hit the latch in order to stop the music. But the warble sound is most likely the speed of the player. You need to ajust the speed. By the battery comparment you’ll see a brown motherboard and next to the battery component. There is a sliver weird thing standing up. U turn that to ajust the speed . I hopeeeee that helps it' was tuff explaining.
回答“Working fine one minute, then stopped completely.”My advice is to take it apart and see if the switch fell off the green card aka motherboard. This swtich looks weird but it gets hit by the play button causing it to play. But other than that it could be tight belts. The belts are too tight. Those are two things to look at goodluck !