LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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3.2.7 LCD Backlight Illumination
There are 5 white LEDs in LCD Backlight circuit which is driven by Charge Pump(MAX8631).
APP_GP10_BL_CTRL is used for Backlight brightness control.
BACKLIGHT CHARGE PUMP
1%
1%
C104
1u
C100
1u
1u
C105
R102
100K
ZD101
ESD9X5.0ST5G
INSTPAR
100K
R103
C101
10u
C106
10u
R104
6.8K
1u
C102
R105
20K
VBAT
8
C103
0.01u
9
3
GND
IN
2
LDO1
4
5
LDO2
16
M1
M2
15
M3
14
13
M4
OUT
25
28
P1
P2
17
24
PGND
1
PIN
REFBP
6
7
SETF
SETM
BGND
29
22
C1N
C1P
23
C2N
27
26
C2P
ENF
21
18
ENLDO
20
ENM1
ENM2
19
F1
12
11
F2
10
F3
F4
MAX8631XETI
U100
VDD_CAM_2V8
APP_GP15_CAM_LDO_CTRL
APP_GP10_BL_CTRL
LCD_BL5
LCD_BL3
LCD_BL1
LCD_BL2
LCD_BL4
VDD_BACKLIGHT
VDD_CAM_1V8
Figure 3-2-10. Charge Pump Circuit LCD Backlight
Z3X-BOX.COM
Содержание KT520
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