Solder the replacement microphone to the same joints on the motherboard.

Solder the connection by momentarily placing the tip of the soldering iron against the connection, pressing solder into the connection (melting it), and quickly removing both the solder and the tip of the soldering iron from the connection. The solder should flow around the wire and motherboard for a successful connection.

The black wire must be soldered to the negative joint.

The red wire must be soldered to the positive joint.

The positive and negative signs are indicated on the motherboard as well as in the picture.