LG KG290 - LCD Back-Light Illumination

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3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.14 LCD Back-light Illumination
LCD backlight LEDs is controlled by AD6721 via AAT3155, U603.
CHARGE PUMP
1u
C628
1u
C627
IN
8
OUTCP
U603
C1+
10
9
C1-
7
C2+
6
C2-
3
D1
D2
2
1
D3
D4
12
EN_SET
11
GND
4
5
AAT3155ITP-T1
C626 4.7u
FB603
C630
1u
1.5K
R613
VBAT
100K
R615
C634
27p
C631
C633
27p
27p
MLED1
MLED2
MLED
LCD_DIM_CTRL
Figure 3-16. MAIN LCD BACKLIGHT ILLUMINATION