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SGH-E400 Flow Chart of Troubleshooting and Circuit Diagrams
4-
5
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5. Microphone Part
6. Speaker Part
Check the reference
voltage on mic path
C418 =2.5V
Reassemblage microphone
NO
resolder or change
C400,R408,R409,R405,R406)
NO
Check U700
NO
YES
YES
Microphone does not work
END
YES
Check the assembled
status of microphone.
Is microphone ok?
Resolder and check the board
to board connector
NO
Check U700
NO
Change or resolder
U700, R205, R206
NO
YES
YES
YES
Speaker does not work
END
Check the connection
status spk to CN200
Check the
R460 = 'High' ?
Check U700, R201, R202
Is speaker ok?
YES
Change Speaker
NO
