Issues with mic not working

Hi,

I have a Samsung S3 mini which has had the usb socket replaced but now the microphone doesn't work when making a phone call, also if recording a video or sound recording it also doesn't capture sound.

I have replaced the mic next to the usb socket (I have tried 3 new mic's) but still no results.

I have replaced many usb sockets in the past and occasionally i'll have a mic stop working but after replacing the mic it's always fine, in this case its not working. Please can anyone offer a suggestion on what may be wrong?

Thanks