Keypad Back-Light Illumination - LG KF350 Service Manual

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.
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VBAT
LD100
LEWWS44-E
LEWWS44-E
LD101
Figure 11 Keypad Back-light LEDs
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3. TECHNICAL BRIEF
R100
KEY_BACKLIGHT
47
R101
47
LGE Internal Use Only