Samsung Ace Plus S7500 Mic Not Working
Samsung S7500 Microphone Solution
To fix or repair mic problem on Samsung GT-S7500, you may first check the microphone module using a multimeter or replace it with a new one to securely confirm that the microphone is still working or not damaged.
Samsung Galaxy Ace Plus S7500 Mic Problem Repair Solution
Trace The MIC’s positive connection ( the inner core layer) down to the filter coil and then check also the filter coil and the ESD protection diode. Replace if necessary. Check also the Mic’s grounding lines.