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No/Low sound from MIC
Customer Service
No/Low sound from MIC
Check if there's
MIC cover
Yes
*#84666*# and activate echo
loop, measure MIC MK400
voltage is 1.5V、0.7V
NO
Check if inductor B402、
B405 is damaged.
NO
Measure C421\C422 with
multimeter to see if there's
0.5V offset voltage
NO
Resolder or replace
CPU U101 MT6250
END
No
Install the MIC cover
YES
Replace MIC
YES
Replace B402 or B405
YES
Replace
C421\C422
33
Service Manual
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