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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
Can you scoping some
sound signal at TP3
Change the TP4
NO
YES
YES
make some sound or
voice to MIC
Work well?
END
YES
Start
TP1 is 1.8V?
Change the Main B’d
NO
Make a call
4. Trouble Shooting
(BB)
4.13.4 Microphone for main MIC
Can you scoping some
sound signal at TP2?
Check 80pin Conn.
Or Change the SUB PCB
NO
YES
4.13.4.1 Normal Mode
Main Microphone path as below:
MIC1
Æ
U400(Analog S/W)
Æ
80pin Conn -> C207
Æ
MSM7227
139P
TP
DNI
C1
MIC401
4
3
2
1
P
G1
G2
O
MIC_BIAS
MIC_1P
MIC1_VGND
SMD, TOP
SUMY0010609
+VPWR
0.1u
C400
U400
9
4
6
3
5
2
7
1
8
10
1B0
1A
1B1
S1
2B0
2A
2B1
S2
GND
VCC
MIC_SEL
MIC_P
MIC_1P
MIC_2P
MIC1_VGND
MIC2_VGND
MIC_VGND
8
H
6
F
5
F
0
1
J
0
1
H
9
H
0
1
C
0
1
B
9
C
9
B
8
F
8
E
7
F
7
E
7
C
7
B
6
C
5
C
6
B
5
B
P
I
_
R
_
E
N
I
L
N
I
_
R
_
E
N
I
L
P
I
_
L
_
E
N
I
L
N
I
_
L
_
E
N
I
L
P
1
C
I
M
N
1
C
I
M
P
2
C
I
M
N
2
C
I
M
P
I
X
U
A
N
I
X
U
A
P
O
_
E
N
I
L
N
O
_
E
N
I
L
P
O
_
1
R
A
E
N
O
_
1
R
A
E
T
U
O
X
U
A
R
_
H
P
H
L
_
H
P
H
P
M
O
C
C
S
A
I
B
_
C
I
M
F
E
R
V
_
H
P
H
MIC_BIAS
C201
47p
u1
20
2
C
u1.
0
30
2
C
u1.
0
40
2
C
50
2
C
u1.
0
u1.
0
60
2
C
u1.
0
70
2
C
u1
80
2
C
C210
0.1u
C211
22u
33p
C7
39p
C223
MIC_VGND|GND
D
N
G
V
_
C
I
M
R_
OI
D
U
A_
MF
L_
OI
D
U
A_
MF
N
O_
E
NI
L
P
O_
E
NI
L
P_
V
C
R
N_
V
C
R
L_
H
P
H
R_
H
P
H
P
CI
M_
R
A
E
P_
CI
M
n
i
p
5
E
o
t
e
s
o
l
C
TP4
TP
TP1
TP2
Содержание GD88O
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