Keypad Back-Light Illumination - LG Prada KE850 Service Manual

3. TECHNICAL BRIEF

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.
PRECHARGING & KEY BACKLIGHT LED
1
Q101 R124 1.5K
2
2SC5585
3
LED_R
2V85_IO
VBAT VCHG
U107 FSA4157L6X
1 6
S B1
2 5
VCC GND
3 4
A B0
C130
0.1u
Figure 14 Keypad Back-light LEDs
R123 0
KEYBACKLIGHT
- 44 -
VBAT
R102 120 R101 120
LD102 LD101