Table of Contents
Advertisement
4.14 KEY backlight Trouble
CHECKING FLOW
CIRCUIT
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
START
Is Pin3 of Q200 low
at KEY_BL_EN = high ?
YES
Are all LEDs
Working?
YES
Backlight will work
properly.
V
B
A
T
K
E
Y
L
D
2
0
0
L
D
2
0
1
V
A
2
0
8
.
3
Q
2
0
0
2
1
C
2
6
4
0
1 .
u
101/140
- 101 -
4. TROUBLE SHOOTING
4. TROUBLE SHOOTING
NO
Check Q200
NO
Check the soldering
each R and LED
NO
Replace or resolder
component
L
E
D
L
D
2
0
2
L
D
2
0
3
R
2
2
2
K
E
Y
_
B
L
_
E
N
1
2 .
K
LGE Internal Use Only
Advertisement
Table of Contents
