Remove the soldered connections to separate the speaker wires from the motherboard.

Remove all black and yellow tape, if necessary, on the motherboard.

Following the red and black wires, coming out of the speaker, to their respective connections on the motherboard will indicate where to solder.

Follow the link below for further soldering information: How To Solder and Desolder Connections.

Soldering irons require a larger amount of heat; use caution when performing this step. Excessive heat can damage parts of your device; do not leave the soldering iron on connections for extended periods of time.