- 141 -
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)
Can you scoping some
sound signal at TP2?
Check 80pin Conn.
Or Change the SUB PCB
NO
YES
4.13.4.2 Speaker phone Mode
Main Microphone path as below:
MIC2
Æ
U400(Analog S/W)
Æ
80pin Conn -> C207
Æ
MSM7227
141P
TP
10u
60
4
C
15p
70
4
C
47p
80
4
C
MIC400
4
3
2
1
P
G1
G2
O
MIC_BIAS
MIC_2P
MIC2_VGND
MIC2_VGND
SUMY0010609
SMD, TOP
+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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