10-1-9. Mp3 part
There is no MP3 sound from Earphone
Are there any signal
at the pin #5,7 of IFC400?
NO
Are there any signal
at R410, R411?
NO
Are there any signal
at the pin #10,13 of UCD401?
NO
Are there any signal
at the C407, 417?
NO
Are there any signal
at the PIN #5,6,7?
YES
⑤
Check UCP201
END
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YES
YES
YES
YES
NO
C445 & C446 =1.8V ?
YES
C445 =3.3V ?
YES
10-21
Flow Chart of Troubleshooting
Replace the Earphone
①
Check & Replace ZD403
②
Check & Replace C457, C458
③
Check C416, 417
④
NO
Check U302
⑥
NO
Check Q401