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Heres the solution for Nokia 2710 navigation edition when trying  to fix a microphone problem issues.  Its a failure on the hardware which there is no audio sound can be heard over the receivers earpiece speaker. 
This solution simply shows the location of the components where you may  to have a check or replace if found damaged.  In Nokia 2710ne, the cell phone microphone is installed or mounted on the bottom side of the PCB board, and also all of its corresponding circuit components  such as the filter coils or surface mount inductors, chip resistors and chip capacitor were also mounted near to it. 


This also includes the circuit connection line paths (mic ways) for easy tracing procedures. The three lines paths corresponds to the polarity of the audio signals, the red line is for the positive, the blue line  is for negative and the bright green lines correspond as the positive voltage bias of the microphone. If this voltage bias when cut or damaged it will also result to a poor audio signal level or no microphone audio signal.

heres a solution that may help repair a Nokia 3720 classic microphone failure. The solution shown below will help you guide to check and trace the components and tracks for the microphone circuit on Nokia 3720 classic.Nokia 7510s Microphone Failure solution on


before trying to replace a new DigiMic microphone first try to trace the line paths od digimic supply voltage and the DigiMic clock and then the corresponding chip resistors that is mounted near to it, the three resistors has a resistance value of 100 ohms each.