Original post by: hitpatel2 ,
Hey here are a couple of things you can check. Get a can of air and blow into the mic, to clean it. If that does not work, you can open the back of the Dsi and check to make sure the mic is still plugged in. It plugs into the motherboard next to the Wifi board. If that is fine, then you need to replace the mic. It is a very difficult job.