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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
LGE Internal Use Only
4.7 LCD Trouble
TEST POINT
CIRCUIT
CN
30
4
FL309
FL306
FL308
FL302
FL305
U304
FB305
R309
TP1
TP2
LCD_WR
LCD_RS
LCD_CS
2
E
D
O
M
F
I
r
o
t
c
e
n
n
o
C
_
D
C
L
1
E
D
O
M
F
I
R317
10K
T
S
R
T
X
E
V
_
3
9
V
2
5
G1
10
G2
1
1
A
_
T
U
O
N
I
2
A
_
T
U
O
N
I
2
3
3
A
_
T
U
O
N
I
4
A
_
T
U
O
N
I
4
1
B
_
T
U
O
N
I
9
8
2
B
_
T
U
O
N
I
3
B
_
T
U
O
N
I
7
4
B
_
T
U
O
N
I
6
9
0
3
L
F
S
R
S
C
2
0
3
L
F
G1
5
G2
10
1
A
_
T
U
O
N
I
1
2
2
A
_
T
U
O
N
I
3
A
_
T
U
O
N
I
3
4
4
A
_
T
U
O
N
I
9
1
B
_
T
U
O
N
I
2
B
_
T
U
O
N
I
8
7
3
B
_
T
U
O
N
I
4
B
_
T
U
O
N
I
6
C328
0.1u
0.1u
4
5
6
7
8
9
C327
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
2
3
0
3
1
3
2
3
3
3
4
3
2
G
1
G
4
G
3
G
1
0
1
1
1
2
1
3
1
4
1
5
1
6
1
8
1
7
1
9
1
2
1
G
L
4
2
1
4
3
3
T
X
A
1
0
6
8
3
0
0
Y
B
N
E
4
0
3
N
C
D315
7
6
4
B
_
T
U
O
N
I
5
0
3
L
F
R
F
1
0
1
R
0
5
1
E
4
8
1
0
1
E
V
C
I
1
0
5
0
1
0
0
Y
E
F
S
5
G1
10
G2
1
1
A
_
T
U
O
N
I
2
A
_
T
U
O
N
I
2
3
3
A
_
T
U
O
N
I
4
4
A
_
T
U
O
N
I
1
B
_
T
U
O
N
I
9
8
2
B
_
T
U
O
N
I
3
B
_
T
U
O
N
I
1
B
_
T
U
O
N
I
2
B
_
T
U
O
N
I
8
7
3
B
_
T
U
O
N
I
4
B
_
T
U
O
N
I
6
R
F
1
0
1
R
0
5
1
E
4
8
1
0
1
E
V
C
I
6
0
3
L
F
G1
5
G2
10
1
A
_
T
U
O
N
I
1
2
2
A
_
T
U
O
N
I
3
A
_
T
U
O
N
I
3
4
A
_
T
U
O
N
I
4
9
1
0
5
0
1
0
0
Y
E
F
S
D314
10K
R318
D312
6
0
0
1
_
E
D
O
I
D
_
I
N
D
K
0
0
1
4
1
3
R
D313
G1
5
G2
10
1
A
_
T
U
O
N
I
1
2
2
A
_
T
U
O
N
I
3
A
_
T
U
O
N
I
3
4
4
A
_
T
U
O
N
I
9
1
B
_
T
U
O
N
I
2
B
_
T
U
O
N
I
8
7
3
B
_
T
U
O
N
I
6
4
B
_
T
U
O
N
I
8
0
3
L
F
D
I
_
D
C
L
2
1
A
T
A
D
_
D
C
L
8
0
A
T
A
D
_
D
C
L
9
0
A
T
A
D
_
D
C
L
1
1
A
T
A
D
_
D
C
L
0
1
A
T
A
D
_
D
C
L
8
0
A
T
A
D
_
L
9
0
A
T
A
D
_
L
0
1
A
T
A
D
_
L
1
1
A
T
A
D
_
L
2
1
A
T
A
D
_
L
3
1
A
T
A
D
_
L
4
1
A
T
A
D
_
L
5
1
A
T
A
D
_
L
0
0
A
T
A
D
_
L
1
0
A
T
A
D
_
L
2
0
A
T
A
D
_
L
3
0
A
T
A
D
_
L
4
0
A
T
A
D
_
L
5
0
A
T
A
D
_
L
6
0
A
T
A
D
_
L
7
0
A
T
A
D
_
L
7
0
A
T
A
D
_
L
6
0
A
T
A
D
_
L
1
D
E
L
M
3
D
E
L
M
D
R
_
D
C
L
5
1
A
T
A
D
_
D
C
L
4
1
A
T
A
D
_
D
C
L
3
1
A
T
A
D
_
D
C
L
R
W
_
D
C
L
S
R
_
D
C
L
S
C
_
D
C
L
C
N
Y
S
V
_
D
C
L
7
0
A
T
A
D
_
D
C
L
6
0
A
T
A
D
_
D
C
L
5
0
A
T
A
D
_
D
C
L
4
0
A
T
A
D
_
D
C
L
0
0
A
T
A
D
_
D
C
L
1
0
A
T
A
D
_
D
C
L
3
0
A
T
A
D
_
D
C
L
2
0
A
T
A
D
_
D
C
L
0
0
A
T
A
D
_
L
1
0
A
T
A
D
_
L
2
0
A
T
A
D
_
L
3
0
A
T
A
D
_
L
4
0
A
T
A
D
_
L
5
0
A
T
A
D
_
L
2
D
E
L
M
D
E
L
M
T
E
S
E
R
_
D
C
L
8
0
A
T
A
D
_
L
9
0
A
T
A
D
_
L
0
1
A
T
A
D
_
L
1
1
A
T
A
D
_
L
2
1
A
T
A
D
_
L
3
1
A
T
A
D
_
L
4
1
A
T
A
D
_
L
5
1
A
T
A
D
_
L
9
0
3
C
u
1
6
2
3
C
p
7
4
5
0
3
B
F
2
0
1
7
0
0
0
H
B
F
S
1
N
P
0
0
1
G
A
5
1
M
L
B
u
1
1
1
3
C
T
A
B
V
p
7
4
2
2
3
C
p
7
4
4
2
3
C
3
3
D
T
E
S
_
N
E
1
1
4
D
N
G
5
N
I
2
1
C
N
u
1
0
1
3
C
2
0
7
8
3
2
0
Y
S
U
E
1
T
-
P
T
I
7
5
1
3
T
A
A
4
0
3
U
+
1
C
0
1
9
-
1
C
+
2
C
7
-
2
C
6
8
P
C
1
1
D
2
D
2
9
0
3
R
K
0
0
1
5
2
3
C
p
7
4
u
1
3
2
3
C
1
D
E
L
M
2
D
E
L
M
3
D
E
L
M
D
E
L
M
L
R
T
C
_
L
B
_
D
C
L
TP2
TP1