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4.19 Keypad Backlight Troubleshooting
Keypad Backlight sequence of KP330 is :
Press the key
KYBD_BACKLIGHT(VA401) go to 0V
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Only for training and service purposes
Start
Press the key
Anode(+) of LD400 is good ?
YES
VA401 is 0V ?
YES
Change the Main board
LD400
VA401
4. Trouble Shooting
Main LED on
NO
Change the Main board
NO
Change the Main board
E K
_ Y
4 R
5 0
+
P V
W
R
1
0 0
h o
4 R
6 0
1
0 0
h o
- 129 -
4. TROUBLE SHOOTING
A B
C
K
L _
G I
T H
L
4 D
0 0
E L
W
W
4 S
P 7
Z A
m
V
L
4 D
1 0
E L
W
W
4 S
P 7
Z A
C I
V
0 L
1 5
m
LGE Internal Use Only
K
B Y
_ D
A B
C
L K
G I
T H
4 A
1 0
1 8
0 0
5 Y
0 0
R F
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Troubleshooting
