iPhone 4 Sound Problems
We have had countless enquiries from clients with regards to the iPhone 4 and not being heard whilst making a call. Herewith some information regarding that:
I have had countless clients complaining about the iPhone 4 when making calls, the person on the other side cannot here them, which implies a faulty mic, however when making a voice recording the mic seems to be working just fine, many other websites or blogs might tell you that replacing the “click&charge jack” or even the top noise cancellation mic will take care of this problem.
This is however not true. Through experience I can tell you it might work for a short amount of time but sure enough the problem always recurs. This is because of a faulty audio codec IC on the circuit board, or more correct, shoddy soldering under the IC. The audio IC’s job is to combine the top speaker and mic into a call, whenever one of these components fails during a call, but works when tested independently from each other you can be certain it’s a faulty audio codec IC. If your phone is still in warranty take it back to where it was bought (as this is a manufacturer fault) and they should replace it for you. Alternately, bring it in to one of our stores as we do offer an Audio Codec Replacement Service.
Noel
Cape Town Workshop Manager
iFix South Africa 
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