Keypad Light - LG U970 Service Manual

3. TECHNICAL BRIEF

3.11.7. Keypad Light

There are 2 White LEDs in Main key backlight circuit, which are driven by KEY_BL_EN line from
MSM6280 GPIO 87.
Figure. Schematic of KEY back light circuit ( KEY side )
In addition, there are 2 White LEDs in UP slide key backlight circuit, which are driven by
KEBY_BACKLIGHT line from PM6650.
+VPWR
Figure. Schematic of KEY back light circuit ( UP slide side )
KEY LED
LEWWS44-E
LD800
+VPWR
Rev.1.2-4M
LD801
LEWWS44-E
KEY_BL_EN
LD900 R900
SSC-TWH104-HL
LD901 R901
SSC-TWH104-HL
- 64 -
R801
100ohm
R802
100ohm
3
R803
Q800
2
PMST3904
4.7K
1
Rev.1.2
100ohm
100ohm
KYBD_BACKLIGHT