- 101 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
LGE Internal Use Only
TEST POINT
CIRCUIT
4.11. 2 Headphone(18 PIN)Trouble)
FB301
FB302
FB303
Q201
U202
U201
U205
C217
R203,C201
R206,C203
R210
FB202
FB201
R202
R201
R213
R214
C224
C232
C204
R217
C220
C205
R204,R205
R215
C228
CN302
U203
C207
+
B
S
U
:
6
)
D
x
T
_
T
R
A
U
(
X
R
/
D
:
7
1
X
T
/
D
:
6
1
N
O
/
R
:
1
1
T
T
A
B
:
0
1
,
9
C
I
M
t
e
s
d
a
e
H
:
2
)
D
x
R
_
T
R
A
U
(
B
S
U
V
:
5
1
D
_
K
C
A
J
:
8
R
_
O
S
H
:
5
-
B
S
U
:
7
L
_
O
S
H
:
4
R
S
D
:
4
1
(25V)
G
H
C
:
3
1
,
2
1
p
0
0
1
3
0
3
C
6
1
3
C
u
7
.
4
N
O
R
W
P
R
X
R
_
T
R
A
U
2
2
3
4
5
6
7
8
9
2
0
3
N
C
1
0
1
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
1
2
0
2
1
2
0
0
0
1
E
-
P
8
1
-
1
4
0
U
G
1
0
8
6
0
0
0
Y
R
N
E
p
7
2
0
0
8
1
2
0
3
B
F
4
0
3
C
R
S
D
G
H
C
V
2
0
3
L
H
n
0
0
1
7
4
6
0
3
R
7
4
5
0
3
R
T
X
E
V
_
3
9
V
2
1u
C308
10K
0
0
8
1
1
0
3
B
F
R302
C332
DNI
C314
1u
T
U
O
10K
R301
1
0
1
7
0
0
0
Y
E
F
S
3
0
3
B
F
R
F
1
0
3
E
1
8
1
0
1
P
F
V
C
I
1
D
N
G
2
D
N
G
N
I
N
I
B
S
U
V
6
0
0
1
_
E
D
O
I
D
_
I
N
D
1
0
3
D
4
0
3
B
F
0
2
2
39p
C312
C313
39p
X
T
_
T
R
A
U
R303
10K
T
A
B
V
R
_
O
S
H
L
_
O
S
H
P
D
B
S
U
1
C
S
U
T
E
D
_
R
S
D
T
C
E
T
E
D
_
K
C
A
J
2
C
S
U
N
O
R
W
P
R
1
_
T
N
A
_
M
F
M
D
B
S
U