Micromax A27 - MIC Fault Diagnosis

14
3.7 MIC fault
Check mic for soldering defect
Unable to record
No sound in microphone
OK
Solder or replace new
micphone
Yes
Check if mic sound hole is
jammed
No
Yes
Clean mic sound hole and
re-assemble mic
No
Replace new mainboard
No
Check mic circuit for fault Yes
Mark the mainboard with
analysis result