Lcd Back-Light Illumination - LG KP210 Service Manual

3. TECHNICAL BRIEF

3.12 LCD Back-light Illumination

LCD backlight LEDs is controlled by AD6721 via AAT3155, U302.
CHARGE PUMP
MLED
LCD_DIM_CTRL
LGE Internal Use Only
VBAT
C320
10u
FB300
R323
11
1.5K
R326 C331
100K 1u
Figure 3.12 MAIN LCD BACKLIGHT ILLUMINATION
U302 AAT3155ITP-T1
5 10
IN C1+
C321
8 9
OUTCP C1-
7
C2+
C324
EN_SET
6
C2-
3
D1
2
D2
1
D3
4 12
GND D4
Copyright © 2008 LG Electronics. Inc. All right reserved.
- 40 -
1u
1u
MLED1
MLED2
MLED3
MLED4
Only for training and service purposes