Keypad Back Light Trouble - LG GD310 Service Manual

5.9 Keypad back light trouble

Check Points
-Signal path is connected well
VBAT
RPWRON
UART_TX
UART_RX
FLIP
KEY_BACKLIGHT
KEY_COL0
KEY_COL1
KEY_COL2
KEY_COL3
KEY_COL4
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Only for training and service purposes
LD100 LEWWS44-E
2 1
LD101
2 1
LEWWS44-E
KEY TO MAIN CONNECTOR
2V62_VIO
CN101
1
TP_RPWON 2
TP_TX
3
TP_RX 4
5
6
7
8
9
10
11
12
13
14
15
TP_GND
GB042-30S-H10-E3000
- 83 -
TP1
R101
KEY_BACKLIGHT
47ohms
R100
47ohms
VBAT
TP_VBAT
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
5. TROUBLE SHOOTING
MAIN_MIC_P
MAIN_MIC_N
VMIC_N
VMIC_P
END_KEY
KEY_ROW0
KEY_ROW1
KEY_ROW2
KEY_ROW3
KEY_ROW4
KEY_ROW5
LGE Internal Use Only