My microphone is not function

@praise39050 the very first thing you want to do, is to reboot your phone. That will make sure the failed mic is not related to any software issue.

The main mic is soldered to the charging board, which is separate from the main board. You can go ahead and check the board as well as the components and traces for the mic. Do not forget to check the flex connector and flex cable from the charging board to the main board. Make sure there are no tears, corrosion or any other damage to it.

If you come across things that look different or you have any further questions about, post some good pictures of that with your Question. that way we can see what you see. Adding images to an existing question

If you have not done any micro-soldering or do not have the tools for this, I would consider changing the board since schematics for this phone are not readily available. The cost for the board is low enough to justify the cost. You'd be looking at something like this.

Since iFixit does not yet have any guides for this phone, use something like this video to work on it.

Instructions for this phone are scarce, so 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.