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5. Microphone Part
Microphone does not work
check the soldered
status of microphone.
Check the reference
voltage on mic path
6. Speaker Part
Speaker does not work
Check the connection
from CN201 to LCD
Check the pin 29 of
U402 and pin 4, 8 of
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SGH-D100/D100A Flow Chart of Troubleshooting and Circuit Diagrams
Yes
Yes
C411 ≒ 2.5 V
Yes
Is microphone ok?
Yes
END
Yes
module
Yes
U401 "High"
Yes
Is speaker ok?
Yes
Is speaker ok?
Yes
END
No
Solder the microphone again
Resolder or change
No
R419, R420, R423
No
Check U701
No
Check the circuit related to
U402,U401
No
Check U601
No
Check U700
No
Change Speaker
2-7
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