LG PRADA KE850 - Keypad Back Light Trouble

5. Trouble shooting
- 91 -
5.9 Keypad back light trouble
Check Points
- Signal path is connected well
- Analog SW is working properly
VA105
EVL5M02200
VBAT
120R101
LD102
R102 120
LED_R
LD101
PRECHARGING & KEY BACKLIGHT LED
3
AB0
4
B1
6
GND
5
1
S
2
VCC
U107 FSA4157L6X
2SC5585
2
3
1
Q101
R127
4.7K
VCHG
R128 100K
R123 0
R124 1.5K
R120 100K
10
R119
0.1u
C130
R121
10K
2V85_IO
VBAT
KEYBACKLIGHT
LED_R