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5. Trouble shooting
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5.9 Keypad back light trouble
Check Points
- Signal path is connected well
KEY Backlight LED
KTC4075E
2
3
1
EQBN0007601
Q300
I
N
D
5
2
3
R
I
N
D
0
1
2
1
3
R
9
0
3
R
4
2
3
R
0
3
1
3
R
K
0
0
1
L
B
_
Y
E
K
R
_
D
E
L
N
E
_
Y
E
K
TP500
CN501
CN101
KEY LED
0
0
2
2
0
M
5
L
V
E
5
0
1
A
V
T
W
H
1
0
4
-
H
S
1
0
1
D
L
6
0
1
R
0
2
1
2
0
1
D
L
T
W
H
1
0
4
-
H
S
0
2
1
7
0
1
R
T
W
H
1
0
4
-
H
S
3
0
1
D
L
VBAT
8
0
1
R
0
2
1
R
_
D
E
L
TP1
Main FPCB
KEY FPCB
Содержание KP500
Страница 1: ...Service Manual Model KP500 Service Manual KP500 Date October 2008 Issue 1 0 Internal Use Only ...
Страница 119: ... 120 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 127: ... 128 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 147: ...LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 148 ...
Страница 169: ...Note ...
Страница 170: ...Note ...