To fix or repair mic problem on Samsung G355H, 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.
If the Microphone is okay, clean the mic’s terminal contact pads. Refer to the solution below and do some check and test procedures.
Samsung Galaxy Core 2 G355H MIC jumper ways
Samsung Galaxy Core 2 G355H MIC jumper ways

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