Only For Training And Service Purposes - LG CT815 Service Manual

3. TECHNICAL BRIEF
3.12.5 LED(KEY/Indicator) Light
There are 2 White LEDs in Main key backlight circuit, which are driven by KPD_DR_N line from
PM7540.
In addition, there is 1 RGB LED in LED Notification-RGB backlight circuit, which are driven by
KEBY_BACKLIGHT line from MSM7200 GPIO78/84/85.
LGE Internal Use Only
KEY BACKLIGHT LEDs(White LED)
Figure. Schematic of Power Keypad back light circuit
LED Notification-RGB
KTK5132E
Q601
G
LEDR
LEDG
LEDB
Figure. Schematic of KEY back light circuit
+VPWR
Rev 1.0
KPD_DRV_N
+VPWR
LD603 LEMC-S11G
D
S
KTK5132E
D
Q602
G
S
KTK5132E
D
Q603
G
S
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Only for training and service purposes