If you decide to try and take out the back of the nintendo their should be a rectangle with two screws you can use a tec deck screw driver to unscrew them try taking out the card chip thingy that says TWL-003 put it back in if that doesnt help the mic then take out the thingy again and than unscrew the entire back of the DSI Their should be a small wire connected to the mic that leads to the motherboard or the large chip. if the wire is not connected to the motherboard conect in by a little thing at the end of the wire to the little slot if it already is connected than make sure you ran a mic test. If your mic truly is broken then call costomer service and request the manufacturer label and send it in for a repair or take it in to a gamer shop or the store you bought it from.