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2-1-7. Speaker Part
Speaker does not work
Check U314
Pin #1 ≒ 13MHz ?
Yes
Check U314
Pin #32 ≒ 1.8
Pin #15 >= 3.3V ?
Yes
Pin #4 of U314 = High ?
Yes
Are there any signal at the
R300 and R307 ?
Yes
Are there any signal at the
pin #4,5 of SLC101?
Yes
Are there any signal at the
pin #56, 57 of SLC103 ?
Yes
Pin #4 of U126 = Low ?
Yes
Are there any signal at the
pin #5,8 of PAM127 ?
Yes
Are there any signal at the
pin #2, 10 of U110 ?
Yes
Is speaker working ?
Yes
END
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No
No
No
No
No
No
No
No
Check the C131, C133, R104, R105
No
Check the U110 and related
No
2-19
SGH-S400i Flow Chart of Troubleshooting
Check the OSC101
Check the U311
Check the UCD307
Resolder or change
R301, R303, R306, C301, C304
Setting spk_sel : High
Check the U304
Change the FPCB
Check the UCP201
parts
Replace the speaker
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