Amazon.com: ePartSolution_Replacement Part for Samsung Galaxy S5 G900P Micro USB Charger Charging Port Flex Cable Dock Connector USB Port + Mic Microphone Flex Cable USA : Cell Phones & Accessories
Amazon.com: MMOBIEL Dock Connector Compatible with Samsung Galaxy S5 2014 - Charging Port - Headphone Port/Microphone Replacement - Micro USB - Incl. Screwdrivers : Cell Phones & Accessories
Samsung Galaxy S5 Teardown - iFixit
How To Fix A Samsung Galaxy S5 Sound / Microphone Problem | Android / Smartphones Easy Fix - YouTube
FIX: Samsung Galaxy S5, S7 Microphone Not Working Issue - Any Android
6 problems with the Samsung Galaxy S5 and how to fix them