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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
5. TROUBLE SHOOTING
5.9 Keypad back light trouble
Check Points
-Signal path is connected well
VBAT
R100
47ohms
47ohms
R101
R
F
0
5
1
X
5
0
5
0
N
V
CI
0
0
1
A
V
LEWWS44-E
LD101
1
2
4
0
1
A
V
R
F
0
5
1
X
5
0
5
0
N
V
CI
LEWWS44-E
LD100
1
2
KEY_BACKLIGHT
TP_RX
TP_TX
TP_RPWON
GB042-30S-H10-E3000
CN101
16
15
17
14
18
13
19
12
20
11
21
10
22
9
23
8
24
7
25
6
26
5
27
4
28
3
29
2
30
1
VBAT
TP_GND
TP_VBAT
2V62_VIO
KEY_ROW5
KEY_ROW0
KEY_COL3
KEY_COL2
KEY_COL1
KEY_COL0
KEY_ROW4
KEY_ROW3
KEY_ROW2
KEY_ROW1
VMIC_N
UART_RX
UART_TX
RPWRON
VMIC_P
MAIN_MIC_P
FLIP
KEY_BACKLIGHT
END_KEY
KEY_COL4
MAIN_MIC_N
KEY TO MAIN CONNECTOR
TP1
Содержание AR140B
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