Samsung GT-C3520 - Main MIC Working

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Level
3
Repair
8-12
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8-3-5.
Main
M
IC
W
orking
Operate MIC
NG
Pollute
MIC Hole?
YES
Clean up
MIC hole
NO
MIC Break
Down?
NO
Change MIC
YES
MIC FPCB
Soldering?
MIC FPCB
Resoldering
Check
MIC500,L312,
L315,C372,ZD
307,
U304
YES
NO
NO
YES
Replace
the components
Change main PBA