Why microphones doesn't work properly

@barakasemwali you are not telling us what it is that makes you say the mic is not properly working. We will need to know if it does not work properly when you make your calls as well as when you record a video etc. If it records video properly then the issue will be a failed mic. The primary mic which is responsible for your headset (regular communication), is located on the sub_board "charging board". Replacing that should fix that mic issue.

Since iFixit does not yet have a guide for that use either something like this video or the Samsung SM A165 Repair Guide Page 72 in that guide will show you how to replace the sub-board

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 issues with their phone. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!