Haha, there is no such pin on the motherboard. You can only cut off the speaker at the plug, find a useless earphone, cut it in the middle and plug it into the sound card audio output port, and connect the left and right channel cables of the earphone ( Generally, they are red and green wires, and the yellow wire is the audio ground wire. Don’t worry about it. Just connect them to the two wires of the speaker respectively.