Speaker phone error

When the handphone which use for calling, the receiver can not hear our voice. Investigate and Testing the MIC's component using multitester with step as follows:

• Using manual multitester in scale x l, Connect the positive pole cable and Negative pole cable from multitester in MIC's component feet, it the needle of multitester move so MIC's component in good condition. But if the needle of multitester motion less so we must replaced MIC's component, Because MIC's component was damaged.
• Furthermore we try stripe of MIC's component. For it, we use manual multitester in scale x1 too, Correlate cable of multitester with MIC's interfaces on positive pole and Negative, if the needle move, so the stripe is well, but if needle of multitester motion less, so MIC's stripe is brokened off. We can use system jumper to solve it.
• If the stripe is well, Try to heat audio IC using blower.
• If handphone still dumb, Change audio IC with newly.
• If the handphone still dumb, So problem found in software of handphone.