- 107 -
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
4.14 key backlight Trouble
TEST POINT
CIRCUIT
R128
R127
R126
R125
R119
R120
R122,R120
T
A
B
V
5
1
6
1
7
1
8
1
9
1
2
0
2
3
4
5
6
7
8
9
G
W
5
4
1
0
2
8
K
X
A
3
0
1
N
C
1
1
1
0
1
2
1
3
1
4
1
1
0
1
0
2
0
0
Y
B
N
E
6
0
6
8
0
0
0
Y
T
D
E
8
0
1
D
D
N
G
0
W
O
R
_
Y
E
K
1
W
O
R
_
Y
E
K
2
W
O
R
_
Y
E
K
3
W
O
R
_
Y
E
K
4
W
O
R
_
Y
E
K
5
W
O
R
_
Y
E
K
2
T
H
G
I
L
K
C
A
B
_
Y
E
K
0
L
O
C
_
Y
E
K
3
T
H
G
I
L
K
C
A
B
_
Y
E
K
1
L
O
C
_
Y
E
K
2
L
O
C
_
Y
E
K
3
L
O
C
_
Y
E
K
4
L
O
C
_
Y
E
K
Y
E
K
R
E
W
O
P
(080728)
Change the R’s value from EDLH0011901(WHITE) TO
EDLH0012504(SNOW WHITE)
R122
R121
130
130
130
R120
LD104
LD109
R126
LD110
130
7
0
1
D
T
A
B
V
6
0
0
1
_
E
D
O
I
D
_
I
N
D
LD103
LD105
130
R125
130
R128
130
R127
LD106
LD101
TWH104-HS
EDLH0012504
130
R119
LD102
2
T
H
G
I
L
K
C
A
B
_
Y
E
K
KEY_BACKLIGHT3