LG KS660 - Keypad Backlight

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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
3.9. Keypad Backlight
There are 2 white color LEDs on Key FPCB for keypad illumination. Keypad Back-light is controlled by
SM-Power BACKLIGHT3 PWM port. The whole configuration of the SM-POWER Flash LED drivers is
shown in below Figure11
.
KEY BACKLIGHT
427
R
021
LD701LD700
VBAT
0
2
1
527R
0
21
727R
627R
02
1
LD703LD702
KEY_BACKLIGHT
< Fig 16. Keypad Back-light LEDs >