Keypad Back-Light Illumination - LG GD310 Service Manual

3.9. 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 © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VBAT
LD100 LEWWS44-E
2 1
LD101
2 1
LEWWS44-E
Figure 12. Keypad Back-light LEDs
R101
KEY_BACKLIGHT
47ohms
R100
47ohms
- 41 -
3. Technical Brief
LGE Internal Use Only