Flow Chart of Troubleshooting
9-8. Speaker Part
Speaker does not work
Yes
Check the supply voltage
of U500
Is the U503 =3.8V?
Yes
Is the U500 output
working?
Check R503, R505
Yes
Check the signals of speaker input
OK
Is Speaker working?
Yes
END
No
No
No signal
No
Check the VBAT or replace U500
Resolder R503, R505 or replace U500
Check the circuit related to
melody signal
Change the Speaker
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