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My laptop has a combo headphone jack. When I plug a 4-pin headphone/earphone, it works fine, but when I plug in a 3-pin microphone, it doesn't work and no audio comes out.
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If you were to wire a 4 pin audio cable to a 3 pin jack which two wires would be joined? Eg. TP120 jack being replaced with a 3.5mm jack. - Quora
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