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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
101/140
4. TROUBLE SHOOTING
START
Is Pin3 of Q200 low
at KEY_BL_EN = high ?
NO
Check Q200
Are all LEDs
Working?
NO
YES
Check the soldering
each R and LED
Backlight will work
properly.
NO
Replace or resolder
component
CHECKING FLOW
YES
CIRCUIT
4.14 KEY backlight Trouble
.
u
1
.
0
4
6
2
C
VA
21
4
0
0
2
Q
1
2
3
VA
21
5
R
24
6
75
K
2
.
1
2
2
2
R
8
0
2
A
V
T
A
B
V
R
24
5
75
VA
20
9
0
0
2
D
L
1
0
2
D
L
2
0
2
D
L
3
0
2
D
L
R
24
4
75
R
24
3
75
N
E
_
L
B
_
Y
E
K
D
E
L
Y
E
K
Содержание GD350
Страница 1: ...Service Manual Model GD350 Internal Use Only Service Manual GD350 Date JANUARY 2010 Issue 1 0 ...
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