Why is my internal mic isn't work?

@esayaslege72376 this of course, could be an issue with the mic having failed. The mic is located on the daughter board.

You can try and replace the board and see if that fixes the mic issue.

You can also follow the Samsung flowchart for the internal Mic issue

To replace the board etc. you can use videos like this one

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Remember,

Repair is War on Entropy!