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Flow Chart of Troubleshooting
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7-12
7-7. Speaker Part
Speaker does not work
Check the supply voltage
of U504.
Is the L504 = 3.8V ?
Check the VBAT or replace L504
No
Yes
Is the D-Amp(U504)
output working?
Check R551 and 552
Resolder R551/R552 or replace U504
No
Yes
END
Is Speaker working?
Change the S MIC module
No
Yes
Yes
Check the connection
status of HDC704
Re-insert the connector (HDC704)
No
Yes