Keypad Back-Light Illumination - LG KE970 Service Manual

3. TECHNICAL BRIEF

3.9. Keypad back-light illumination

There are 2 snow white color LEDs on the KEY FPCB for keypad illumination. Keypad Back-light is
controlled by SM-Power LED port which has constant current control function.
The whole configuration of the SM-POWER LED drivers is shown in below Figure16.
KEY_BACKLIGHT
Figure 13 Keypad Back-light LEDs
R501 100ohm
R502 100ohm
change to LEWWS44
Figure 14 Keypad Back-light LEDs
- 42 -
LEWWS44-E
LD501
LD502
LEWWS44-E
VBAT