3.14 LCD Back-light Illumination. LG KG291, KG290

3. TECHNICAL BRIEF

3.14 LCD Back-light Illumination

LCD backlight LEDs is controlled by AD6721 via AAT3155, U603.

CHARGE PUMP

VBAT

C626 4.7u

MLED

FB603

R613

LCD_DIM_CTRL

1.5K

R615

100K

C630

1u

C631

27p

5

U603

IN

AAT3155ITP-T1

C1+

10

8

OUTCP C1-

C2+

9

7

11

EN_SET

4

GND

C2-

D1

D2

D3

D4

6

3

2

1

12

C627

1u

C628

1u

C633

27p

C634

27p

MLED1

MLED2

Figure 3-16. MAIN LCD BACKLIGHT ILLUMINATION

Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

- 37 LGE Internal Use Only