- 136 -
4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.15.6 Microphone for main MIC
Main Microphone path as below:
MIC
→
C239,C243
→
U201(audio codec)
→
C214, C219
→
MSM62780
→
MIC feed back gain logic
MSM internal CODEC
Can you scoping some
sound signal at C239,C243?
Change the MIC
NO
YES
YES
make some sound or
voice to MIC
Work well?
END
YES
Can you scoping some
sound signal at C214,C219 ?
Check the U201 or
Change the Main Bíd
NO
Start
MIC_BIAS(C223) is 2.7V?
Change the Main Bíd
NO
Make a call
YES
u
1
9
3
2
C
u
1
3
4
2
C
1
G
2
3
2
G
O
1
P
4
3
-
B
P
-
5
E
H
4
0
2
0
M
P
S
0
0
2
C
I
M
39p
C250
S
A
I
B
C
I
M
_
M
W
N
1
C
I
M
_
M
W
P
1
C
I
M
_
M
W
u
1
9
3
2
C
u
1
3
4
2
C
1
G
2
3
2
G
O
1
P
4
3
-
B
P
-
5
E
H
4
0
2
0
M
P
S
0
0
2
C
I
M
39p
C250
S
A
I
B
C
I
M
_
M
W
N
1
C
I
M
_
M
W
P
1
C
I
M
_
M
W
9
0
2
R
K
0
0
1
u
1
1
2
2
C
A4
VMID
VREF
B5
H3
VXCLK
J1
VXDIN
VXDOUT
J2
J3
VXFS
7
B
PCMCLK
J8
PGND
H9
G9
PVDD
9
D
1
T
U
O
R
9
B
2
T
U
O
R
SCLK
H1
SDIN
G1
E1
2
T
U
O
L
9
A
LRC
H4
MCLK
J6
1
C
I
M
1
C
2
D
N
1
C
I
M
2
C
I
M
1
D
2
E
N
2
C
I
M
4
B
S
A
I
B
C
I
M
MODE_GPIO3
F1
6
B
1
O
N
O
M
2
O
N
O
M
N
I
C
A
P
O
C
A
3
B
J5
ADCDA
T
AGND
A5
A6
A
VDD
BCLK
J4
F2
CSB_GPIO5
H5
DACDA
T
GP1_CLK1
G8
J9
GP2_CLK2
GPIO4
V
R
-
B
E
L
3
5
7
8
M
W
1
0
2
U
1
1
2
R
K
0
0
1
4.7u
C224
9
1
2
C
u
1
0
1
2
R
K
0
0
1
p
3
3
3
2
2
C
u
7
.
4
p
3
3
C213
TP205
C225
4.7u
p
1
5
2
6
8
C
p
1
5
3
6
8
C
u
1
4
1
2
C
u
1
0
2
2
C
N
1
C
I
M
_
M
W
P
1
C
I
M
_
M
W
P
2
C
I
M
_
M
W
N
2
C
I
M
_
M
W
S
A
I
B
C
I
M
_
M
W
2
O
N
O
M
_
M
W
1
O
N
O
M
_
M
W
1
T
U
O
R
_
M
W
2
T
U
O
L
_
M
W
2
T
U
O
R
_
M
W
r
a
e
n
e
c
a
l
P
8
1
W
n
i
p
M
S
M
%
0
1
)
S
S
V
C
E
D
O
C
(
0
0
1
O
I
P
G
_
2
T
A
D
_
C
C
D
S
1
0
1
O
I
P
G
_
3
T
A
D
_
C
C
D
S
6
2
M
9
9
O
I
P
G
_
1
T
A
D
_
C
C
D
S
5
2
F
5
2
M
T15
AC20
AC19
LINE_R_IP
5
0
1
O
I
P
G
_
Y
R
A
M
I
R
P
_
C
N
Y
S
V
_
P
D
M
2
D
A
3
E
A
4
0
1
O
I
P
G
_
A
D
N
O
C
E
S
_
C
N
Y
S
V
_
P
D
M
MIC1N
AF20
MIC1P
AE20
AF21
MIC2N
MIC2P
AF22
MICBIAS
AC21
LINE_L_IN
LINE_L_IP
AC22
LINE_R_IN
HPH_VREF
AA19
EAR1OP
AF18
CCOMP
AA20
AF19
AUXIN
AE19
AUXIP
AA18
AUXOUT
0
1
5
C
p
0
1
5
0
5
C
u
1
.
0
p
9
3
3
5
8
C
p
9
3
2
5
8
C
1
1
5
C
p
0
1
4
5
8
C
p
9
3
p
9
3
1
5
8
C
WM_RXP
WM_MONO2
WM_MONO1
C239, C243
[main MIC]
[audio codec]
[MSM6280]
C214, C219
C223
Summary of Contents for KT610
Page 1: ...Date June 2008 Issue 1 0 Service Manual Model KT610 Service Manual KT610 Internal Use Only ...
Page 233: ...Note ...
Page 234: ...Note ...