If you find som carbon or water damages in the mother board. Clean these parts with electronics cleaner and apply heat with hot air to make it dry. Much heat can damage the nokia asha 203 mother board.
In diagram above you can see two different color lines these lines are given to identify components that are used in mic function of nokia asha 203.Check all these tracks with meter and if any link is break apply jumpers as given in nokia asha 203 mic repairing diagram above.
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