once you have dis assembled mobile phone look at board vary carefully and check if there is some rust or carbon.Clean
these parts and area with electronics cleaner and leave it to dry for a few mints with hot air.In above diagram all tracks are given in red and blue colors.these tracks show positive and negative paths of mic parts.so check these components and paths with electronics miter and if path missing apply jumpers.
Because mic is attached with board so you can remove it with solding iron by applying much solder on mic and then slip it once it is too hot.And use new mic to fix mic problem in Nokia 110.
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