I assume you meant the front camera assembly, there are two things to check:
- Was the replacement front camera assembly for 5S or for SE? The microphone on these parts are internally different which will not work vice versa if mixed.
- Did you ensure the microphone is seated into the black rubber gasket which sits near the earpiece speaker?
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If the microphone was working before the front camera assembly replacement chances are the replacement part is faulty.
I assume you meant the front camera assembly, there are two things to check:
- Was the replacement front camera assembly for 5S or for SE? The microphone on these parts are internally different which will not work vice versa if mixed.
- Did you ensure the microphone is seated into the black rubber gasket which sits near the earpiece speaker?