Keypad Back Light Trouble - LG KF510C Service Manual

5. Trouble shooting

5.9 Keypad back light trouble

Check Points
- Signal path is connected well
- Analog SW is working properly
KEY BACKLIGHT
R700
KEY_BACKLIGHT
R701
2V62_VIO 2V9_VMME
3V1_VIB
MMC_DETECT
MMC_D(0)
MMC_D(1)
MMC_D(2)
MMC_D(3)
MMC_CLK
KEY_ROW0
KEY_ROW1
KEY_ROW2
KEY_ROW3
KEY_ROW4
FLASH_LED_EN
FLASH_LED_TORCH
MAIN_MIC_P
MAIN_MIC_N
C259 C258 C260
0.1u 0.1u 0.1u
LGE Internal Use Only
NUMBER TO SUB CONNECTOR
VBAT
TP1
LD700 LEWWS47PAZ
100ohm
100ohm
LD701
LEWWS47PAZ
TP2
VBAT 2V9_SIM
MAIN TO SUB CONNECTOR
CN200
G1 G2
1 44
2 43
VIB_IN-
3 42
VIB_IN+
4 41
KEY_BACKLIGHT
5 40
KEY_COL0
6 39
KEY_COL1
7 38
KEY_COL2
8 37
KEY_COL3
9 36
BAT_ID
10 35
END_KEY
11 34
SIM_EN
12 33
SIM_IO
13 32
SIM_RST
14 31
SIM_CLK
15 30
SPK_RCV_N
16 29
SPK_RCV_P
17 28
MMC_CMD
18 27
19 26
20 25
21 24
VMIC_P
22 23
G3 G4
C261 C262
0.1u 0.1u
VMIC_P
KEY_ROW0
KEY_ROW1
KEY_ROW2
KEY_ROW3
KEY_ROW4
MAIN_MIC_P
MAIN_MIC_N
SUB TO MAIN CONNETOR
2V62_VIO
3V1_VIB
MMC_DETECT
MMC_D(0)
MMC_D(1)
MMC_D(2)
MMC_D(3)
MMC_CLK
KEY_ROW0
KEY_ROW1
KEY_ROW2
KEY_ROW3
KEY_ROW4
FLASH_LED_EN
FLASH_LED_TORCH
MAIN_MIC_P
MAIN_MIC_N
Copyright © 2008 LG Electronics. Inc. All right reserved.
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VBAT
CN700
1 20
KEY_BACKLIGHT
2 19
KEY_COL0
3 18
KEY_COL1
4 17
KEY_COL2
5 16
KEY_COL3
6 15
BAT_ID
7 14
END_KEY
8 13
9 12
10 11
VBAT 2V9_SIM
2V9_VMME
CN500
G1 G2
1 44
2 43
VIB_IN-
3 42
VIB_IN+
4 41
KEY_BACKLIGHT
5 40
KEY_COL0
6 39
KEY_COL1
7 38
KEY_COL2
8 37
KEY_COL3
9 36
BAT_ID
10 35
END_KEY
11 34
SIM_EN
12 33
SIM_IO
13 32
SIM_RST
14 31
SIM_CLK
15 30
SPK_RCV_N
16 29
SPK_RCV_P
17 28
MMC_CMD
18 27
19 26
20 25
21 24
VMIC_P
22 23
G3 G4
C511 C512 C513
1u
0.1u 0.1u
Only for training and service purposes