Only For Training And Service Purposes - LG GT500 Service Manual

3. TECHNICAL DESCRIPTION
3.2.5 LCD Backlight Illumination
There are 5 white LEDs in LCD Backlight circuit which is driven Charge Pump(AAT3169).
APP_GP_BL_EN is used for Backlight brightness control.
APP_GP_BL_EN
3.2.6 Keypad Illumination
There are 4 side view white LEDs in Main board backlight circuit, which are driven by LED1, LED2 port from
AB3100.
Figure 3-2-11. Keypad Backlight LED Interface and Backlight Circuit
LGE Internal Use Only
VBAT
U604
4
C1+
5
C1-
9
IN
3
EN_SET
10
GND
15
PGND
C635
1u
Figure 3-2-10. SUB PMIC Circuit LCD Backlight
LD1000
SSC-TWH104-HL
LD1001
SSC-TWH104-HL
LD1002
SSC-TWH104-HL
LD1003
SSC-TWH104-HL
AAT3169IFO-T1
7
C2+
8
C2-
R631
6
OUTCP
11
D1
12
D2
13
D3
14
D4
1
D5
2
D6
C634
1u
KEY_LED1
KEY_LED2
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0
WLED_PWR
WLED1
WLED2
WLED3
WLED4
WLED5

Only for training and service purposes