Samsung GT-S3370 - Page 38

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Flow Chart of Troubleshooting
9-10
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9-1-5.
Microphone Part
(
EAR MIC)
P5
C
3
1
4
H
S
E
D
_
B
I
A
S
U
1
9
H
P
H
_
O
U
T
_
L
_
P
T
1
9
L
I
N
E
_
O
U
T
_
R
_
N
T
2
1
H
K
A
IN
0
T
2
2
H
P
H
_
V
N
E
G
R
1
9
L
I
N
E
_
O
U
T
_
L
_
P
R
2
1
H
K
A
I
N
1
R
2
2
H
P
H
_
O
U
T
_
R
_
N
P
1
8
E
A
R
O
N
P
1
9
M
IC
1
P
P
2
1
M
IC
2
N
P
2
2
L
I
N
E
_
I
N
_
R
_
N
P
2
3
E
A
R
O
P
N
1
9
M
IC
1
N
N
2
1
M
IC
2
P
N
2
2
L
I
N
E
_
I
N
_
L
_
P
N
2
3
C
C
O
M
P
M
2
1
R
X
_
I
N
_
U
|G
_
L
B
P
L
2
2
R
X
_
I
N
_
U
_
H
B
2
P
L
2
3
R
X
_
IN
_
G
_
L
B
P
J
2
2
R
X
_
I
N
_
U
|G
_
H
B
1
P
J
2
3
R
X
_
I
N
_
U
|G
_
L
B
M
K
2
2
R
X
_
IN
_
U
_
H
B
2
M
K
2
3
R
X
_
I
N
_
G
_
L
B
M
H
2
2
R
X
_
IN
_
U
|G
_
H
B
1
M
H
2
3
R
X
_
I
N
_
G
_
H
B
P
G
2
3
GPIO_55|GPS_ADCI
F14
R
X
_
I
N
_
G
_
H
B
M
F
2
3
EBI2_A_D_1
D1
EBI2_A_D_2
D2
EBI2_A_D_0
E1
P
W
R
_
D
E
T
_
I
N
C
2
3
T
X
_
O
U
T
_
G
_
L
B
B
2
3
P
A
_
D
A
C
A
1
8
T
X
_
O
U
T
_
U
_
L
B
A
1
9
T
X
_
O
U
T
_
U
_
H
B
2
A
2
0
T
X
_
O
U
T
_
U
_
H
B
1
A
2
1
T
X
_
O
U
T
_
G
_
H
B
A
2
2
HSED_BIAS_1.8V
C
3
1
0
C
3
1
1
S
P
K
_
O
U
T
_
P
S
P
K
_
O
U
T
_
N
R
C
V
_
N
R
C
V
_
P
H
P
H
_
O
U
T
_
L
V
T
H
E
R
M
_
IN
M
IC
1
_
M
S
M
_
N
M
IC
2
_
M
S
M
_
P
R
A
D
I
O
_
L
O
U
T
H
P
H
_
O
U
T
_
R
M
IC
1
_
M
S
M
_
P
M
IC
2
_
M
S
M
_
N
R
A
D
I
O
_
R
O
U
T
V
B
A
T
T
_
I
D
U
9
0
0
_
G
9
0
0
_
R
X
M
U
M
T
S
2
1
0
0
_
R
X
M
U
9
0
0
_
G
9
0
0
_
R
X
P
U
M
T
S
2
1
0
0
_
R
X
P
D
C
S
_
R
X
P
G
S
M
8
5
0
_
R
X
M
P
C
S
_
R
X
M
G
S
M
8
5
0
_
R
X
P
P
C
S
_
R
X
P
P
W
R
_
D
E
T
EBI2_D(1)
EBI2_D(2)
EBI2_D(0)
D
C
S
_
R
X
M
D
C
S
1
8
0
0
_
P
C
S
1
9
0
0
_
T
X
G
S
M
8
5
0
_
G
S
M
9
0
0
_
T
X
EBI2_D(3)
G
S
M
_
P
A
_
P
W
R
_
C
T
L
U
M
T
S
9
0
0
_
T
X
U
M
T
S
2
1
0
0
_
T
X
UCP 300
Microphone does not work
Yes
Check the reference voltage on mic path
Yes
On booting,
HSED_BIAS(R500)
≒
1.8V ?
Yes
No
No
Check UCP300
On calling with ear_mic,
MIC2+(C505)
&
MIC2-(C517)
≒
1.0V?
Yes
On calling with ear_mic,
VBUS_5V(C542)
≒
1.25
V?
No
Yes
Check U501
On calling with ear_mic,
EARMIC_P(L504)
≒
1.25
V?
Yes
No
Change R500 or R502 or L504
Check UCP300
END