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5-5 Microphone Part
Microphone does not work
U400 pin 4, 5 = short?
U619 pin 5 (AVCC)
Check the tension of MIC Module
Flow Chart of Troubleshooting and Circuit Diagrams
Yes
Yes
3.0V?
Yes
Check the circuit
from U618 to MIC1
Yes
Yes
END
No
Resolder U400
No
Check the circuit related to U619
No
Resolder the
R444,R445,R446,R447,
C446,C450,C451
No
Replace the Mic or Mic Holder
5-9
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