Speaker Unit Replacement

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De-solder the existing soldered connections and remove the speaker from the rest of the device.
Insert and solder in a working speaker of the same model. Make sure the points where the wire ends connected are consistent with the old speakers.
Note: If you notice that a wire is disconnected, this may be the cause of your problems. Re-solder the connection to fix it.
You can refer to iFixit's guide or this informative video for more information on soldering.

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