LG GM750 Service Manual page 131
Hide thumbs
Also See for GM750:
- Quick reference manual (298 pages) ,
- User manual (282 pages) ,
- User manual (138 pages)
Table of Contents
Advertisement
4. TROUBLE SHOOTING
4.10.4. Microphone for main MIC
Main Microphone path as below:
MIC
FB506
V
M
C I
_
B
A I
S
M
C I
_
1
N
F
B
5
0
6
M
C I
_
1
P
S
F
B
H
0
0
0
8
1
0
2
D
e
e l
e t
d
R
e
. v
LGE Internal Use Only
C249,C250
MSM7200A
M
C I
5
0
1
1
P
2
G
1
3
G
2
4
O
S
P
U
0
4
1
0
H
R
5
H
P -
B
C
Start
Make a call
MIC_BIAS(C254)
is 1.8V?
YES
make some sound or
voice to MIC
Can you
scoping some
sound signal at
C249,C250?
YES
Work well?
V
M
C I
_
B
A I
S
D
I N
[MSM7200A]
NO
Change the Main B'd
NO
Change the MIC
YES
END
- 132 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
C
1
W
P I
E
R
D
1
Y
M
_
L
R
T
O
U
C
H
_
Y
E
1
Y
P
_
U
R
T
O
U
C
H
_
Y
D
2
X
M
_
L
L
T
O
U
C
H
_
X
E
2
X
P
U
L
T
O
U
C
H
X
Only for training and service purposes
1
Y
D
2
Y
U
2
X
L
1
X
R
Advertisement
Table of Contents
Troubleshooting
