LG PRADA KE850 - Keypad Back-Light Illumination

3. TECHNICAL BRIEF
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3.9. Keypad back-light illumination
There are 2 red color LEDs on the Key FPCB for keypad illumination. Keypad Back-light is controlled
by GPIO port of the S-GOLD2.
Figure 14 Keypad Back-light LEDs
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
VA105
EVL5M02200
VBAT
120R101
LD102
R102 120
LED_R
LD101