If you found some rust carbon or water damages then it can also be cause of Nokia C5-03 mic problem to solve and fix mic problem in Nokia C5-03 clean all the rust and carbon with electronics cleaner and apply hot air to make it dry.
In above diagram you can see a mic ( microphone ) and some red color lines. These lines are pointing the parts that are used in microphone mic functions in Nokia C5-03.
Check all these tracks and paths with meter and if any of them is missing apply jumpers as shown in above diagram.
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