LG GT500 - Page 45

- 46 -
LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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.
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
Figure 3-2-10. SUB PMIC Circuit LCD Backlight
0R631
0
R629
100K R630
C635
1u
C633
1u
VBAT
1u
C632
C634
10
GND
9
IN
OUTCP
6
PGND
15
1u
U604 AAT3169IFO-T1
C1+
4
5
C1-
C2+
7
C2-
8
11
D1
D2
12
13
D3
14
D4
1
D5
2
D6
EN_SET
3
WLED2
WLED3
WLED4
WLED5
APP_GP_BL_EN
WLED_PWR
WLED1
LD1003
SSC-TWH104-HL
VBAT
SSC-TWH104-HL
LD1001
LD1002
SSC-TWH104-HL
LD1000
SSC-TWH104-HL
KEY_LED2
KEY_LED1
B4
LED1_N
A4
LED2_N
D3
LED3_N
C3
KEY_LED2 KEY_LED1