Samsung SGH-P400 Service Manual page 22

6. Speaker Part
There is no sound from Speaker
Is the terminal of Speaker
Yes
The pin#4
of U400 is
"Low"
No
Check U400
O.K.?
Yes
Are there any signals
at the C220,C227?
The type of sound
from the Speaker is
Yes
Is there any
signals
at the pin#5 pin#7
of U400?
pin#7 of U400?
Check U401
Yes
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SGH-P400 Flow Chart of Troubleshooting
No
No
Check LCD or Replace CN200
Yes
Melody
Is there any signals
at the pin#2 and
pin#10 of U400?
No No
Yes
END
3-11
Replace the Speaker
No
Yes
The pin#4 of
U400 is
"High"
No
Check U700