GSM FIX ALL PROBLEM

This solution covers for Nokia 7230 if the microphone failed or no voice sound can be heard over the receivers mobile phone. This solution is simple guide that lets you trace or check certain components on nokia 7230 PCB board that might cause the problem.
Check and ensure that the microphone module is okay or try to install a new replacement on it.
The solution above showed the components such as the filter coils and 47 ohms resistor if the microphone is okay. Replace these components if found damaged.

Heres the ready made solutions may help to fix and repair on Nokia 7230 if charger no response occurred when  a battery charger is plug-in. Nokia 5800 xpressmusic damaged Power ON-OFF switch jumper ways

Just locate the particular components on the bottom side of the PCB board. From the charger pin positive terminal pads the  voltage feeds across to a chip fuse, filter coil, chip diodes and filter capacitors. Just configure how the voltage line paths flow across to these components and check for continuity and possible short circuit. Replace components if found damaged or busted.