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Put on the headphones, plug in the sound source, play music, then bend the cord 90 degrees with your thumb, straighten the cord, and try to follow the cord down the connector. After the break, the sound sounds very noisy and unstable, you can bend or twist the point again to see if it is a problem. When you find it, you tape it up.
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Slide the tube down the line to try. This shrink tube looks similar to the rest of the cord and can be used to replace the broken part if you break the headset. Now hurry up and use the shrink tube. You can't use the wire after you've welded it.
If you want to repair the broken line of this Apple earphone, you can weld it to a third-party earphone repair professional repair point. You need to cut the wire cover of the broken earphone and then weld the line to repair it before it can return to normal