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Flow Chart of Troubleshooting
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7-7
7-4. Speaker Part(Melody)
U504(Melody IC)
pin7 & 32 = 2.8V?
Speaker does not work
Check the Clock signal
at
U504 pin1 (13.5MHz)
Check the clock generation circuit
(related to U200 and U504)
END
No
Yes
No
Resolder or replace U200(PMIC)
U504 pin4 ≒ 2.8V?
(When U808 operate)
Resolder UCP100(MSM6250)
Yes
No
U504 pin15
≒ Battery Volt ?
Check the circuit related to
"pin17 & 18" signal
Yes
No
Is Speaker working?
No
Yes
Change the Speaker
Yes
Yes