Samsung SGH-E360 - Speaker Part Troubleshooting

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Flow Chart of Troubleshooting
7-12
7-6. Speaker Part(Melody)
Check the U604
Pin 3, 15
Speaker does not work
Check the U603 Pin 5
(EAR1)
Check the U603 Pin 1 (LOUD_EN),
Resolder U604
No
Yes
No
Check the U300
Yes
U300 pin 17,18 ≒ 1.8V?
(When U300 operate)
Resolder U300
No
No
END
Check LCD MODULE
SPK+, SPK-
=Operate
Check the board to board
Connector
Is Speaker working?
Change the Speaker
No
Yes
Yes
Yes
Yes