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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
LCD backlight LEDs is controlled by AD6726 via AAT2845, U404.
MLED is the charge pump output to drive LCD backlight LEDs, and MLED1 & MLED2 are current
sink ports.
Figure 3.13 MAIN LCD BACKLIGHT ILLUMINATION
3.13 LCD Back-light Illumination
2V8_AVDD
R427
120K
R423
100K
C435
1u
C433
27p
R425
0
0.1u
R424
0
C421
VBAT
R418
100K
17
16
D4
ENLDO
15
EN_SET
14
FB
A
7
FBB
20
GND
18
4
IN1
6
IN2
8
LDO
A
LDOB
3
OUT
11
PGND
5
THER_GND
21
AAT2845IML-EE-T1
U404
12
C1_M
13
C1_P
C2_M
9
10
C2_P
CBP
19
D1
2
1
D2
D3
1u
1V8_CAMIO
C427
FB401
120K
R422
C430
160K
R421
27p
FB400
27p
C429
R426
62K
C428
1u
C432
1u
1V8_CAMCORE
C431
10u
1.5K
R420
2.2u
C434
CAM_PWR_EN
MLED2
MLED1
LCD_DIM_CTRL
MLED