Lcd Back-Light Illumination - LG GW520 Service Manual

3.11 LCD back-light illumination

SC654 is high efficiency charge pump LED driver using
.The load and supply conditions determine whether the charge pump operates 1X, 1.5X, or 2X mode.
LCD_BL_CTRL
ICVL0518100Y500FR
[
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Only for training and service purposes
VBAT
SC654ULTRT
U800
EUSY0369701
4.7u
12
IN
C802
5
SPIF
6
GND
VA800
C804 1u C805
Figure 3.11-1] LCD charge pump circuit diagram
GW520 service manual
11
OUT
13
BL1
14
BL2
1
BL3
2
BL4
3
BL5
4
BL6
1u
- 47 -
3. BB Circuit Technical brief
MLED
MLED1
MLED2 4.7u
MLED3
C803
MLED4
MLED5
LGE Internal Use Only