Introduzione
The sound can sometimes get muffled through both earpieces which probably means there is an issue in the speakers. If the speakers themselves are the problem, then there may not be much of a chance of repairing the existing pair. If the speaker is not functioning properly it may need to be replaced altogether.
Strumenti
Ricambi
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Insert new speaker and solder the five wires into corresponding positions onto the new speaker.
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Conclusione
To reassemble your device, follow these instructions in reverse order.