Samsung GT-S3370 Service Manual page 38

Flow Chart of Troubleshooting
9-1-5. Microphone Part (EAR MIC)
Check the reference voltage on mic path
UCP 300
P5 F14
GPIO_55|GPS_ADCI
Microphone does not work
Yes
Yes
On booting,
HSED_BIAS(R500) ≒ 1.8V ?
Yes
On calling with ear_mic,
VBUS_5V(C542)
≒ 1.25V?
Yes
On calling with ear_mic,
EARMIC_P(L504)
≒ 1.25V?
Yes
On calling with ear_mic,
MIC2+(C505) & MIC2-(C517)
≒ 1.0V?
Yes
END
D2
EBI2_A_D_2
D1
EBI2_A_D_1
E1
EBI2_A_D_0
HSED_BIAS_1.8V
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This Document can not be used without Samsung's authorization
No
Check UCP300
No
No
Change R500 or R502 or L504
No
Check UCP300
EBI2_D(3)
EBI2_D(2)
EBI2_D(1)
EBI2_D(0)
9-10
Check U501