Keypad Back Light Trouble - LG KF350 Service Manual

4.9 Keypad back light trouble

Check Points
-Signal path is connected well
FM_ANT
HOOK_DETECT
JACK_TYPE
HSO_L
HSO_R
USB_DP
USB_DM
JACK_DETECT
RPWRON_EN
DSR
UART_TX
UART_RX
FLIP
KEY_BACKLIGHT
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VBAT
LD100
LEWWS44-E
LEWWS44-E LD101
KEY TO MAIN CONNECTOR
2V62_VIO VCHG
4. TROUBLE SHOOTING
R100
KEY_BACKLIGHT
47
R101
47
CN101
1 44
2 43
3 42
4 41
5 40
6 39
7 38
8 37
9 36
10 35
11 34
12 33
13 32
14 31
15 30
16 29
17 28
18 27
19 26
20 25
21 24
22 23
GB042-44S-H10-E3000
- 81 -
VBAT VUSB_USB
MAIN_MIC_P
MAIN_MIC_N
VMIC_P
MAIN_MIC_N
END_KEY
KEY_ROW0
KEY_ROW1
KEY_ROW2
KEY_ROW3
KEY_ROW4
KEY_ROW5
KEY_COL0
KEY_COL1
KEY_COL2
KEY_COL3
KEY_COL5
LGE Internal Use Only