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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.8 Keypad back-light illumination
There are 2 snow white color LEDs on Key FPCB for keypad illumination. Keypad Back-light is
controlled by SM-Power Flash LED port which has constant current control function. The whole
configuration of the SM-POWER Flash LED drivers is shown in below Figure11.
Figure 11 Keypad Back-light LEDs
ICVN0505X150FR
VA100
ICVN0505X150FR
VA101
LEWWS44-E
LD101
R101
47
47
R100
LD100
LEWWS44-E
VBAT
KEY_BACKLIGHT