Samsung SGH-X640 Service Manual page 32

Flow Chart of Troubleshooting
5. Microphone Part
Microphone does not work
Check the connection
from MIC
Check the circuit
from U200 to MIC
Check the MIC
Yes
Yes
Yes
Yes
END
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
No
Resolder MIC
No
Resolder the R601, R605, R611, R612, R613,
No
Replace the MIC
7-8
C604 and C610