check all these components that are encircled with pink line.and make jumper to the resistance where a red line is indicated.
and D501 is the ic that is used in mic function for sony ericsson k310i.so please check it also and replace for mic solution.
for more detail and new tips and tricks about this problem keep visiting this page we will update it timely with new diagrams.some related post are also given bellow you can read them also for more information.
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