Introduction
If your videos are not recording sound, replacing the microphone will likely fix this.
Tools
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Remove the microphone first from the rubber housing it is located in, after which you will disconnect the wires connecting the microphone to the motherboard from where they are attached on the motherboard. You will then solder the new speakers wires in the same locations on the motherboard as the wires you just removed.
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Conclusion
To reassemble your device, follow these instructions in reverse order.