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8. Level 3 Repair
8-4-10 Microphone Part
No
Microphone does not work.
Yes
Operating Loop back mode
on in Factory mode
Yes
Yes
Yes
Not OK
No
Not OK
Reassembly the MIC Rubber or Remove the abnormal
things
Check the C474 or U401
Replace the MIC400
Check the MIC Rubber on
the REAR
Check the Micbias level at
C474=1.8V
Check the SMD or Crack of
MIC
END
Replace the CODEC U401 or U300