Signal Control Path For; Led And Indicator Led - LG KG195 Service Manual

4. Circuit Description
4.2.13 SIGNAL CONTROL PATH FOR BACKLIGHT LED, CAMERA FLASH

LED AND INDICATOR LED

4.2.13.1 Backlight LED Control
The LCD backlight is controlled by the PWL signal from the MTK6226. The backlight is turned on when
PWM1_LCM_EN is high. The LCD backlight a 5V power supply. The RT9396 DC/DC converter (U801)
generates the singal for LED1,LED2 ,LED3 Detailed circuit diagram is as shown below.
1
ID (LOW)
2
NC
3
VDD (2.8V)
4
RESET
5
D7
6
D6
7
D5
8
D4
9
D3
10
D2
11
D1
12
D0
13
RD
14
WR
15
RS
16
CS
17
K3
18
K2
19
K1
20
A1
21
GND
22
GND
J801
1.77"_QQVGA
LCM-ARIMA-1.77-QQVGA-11
P.4 PWM1_LCM_EN
LGE Internal Use Only
LED3
LED2
VBAT
LED1
C807 C808
33pF_5% 33pF_5%
0508 0508
R801
10K_5%
VBAT
0402R-S
C804
100pF_5%
0402C-S C802
4.7uF_10%_6.3V
0603C-S
- 42 -
GPIO18_LCM_ID P.4
LRSTB
NLD7
NLD6
NLD5
NLD4
NLD3
NLD2
NLD1
NLD0
LRDB
LWRB
LPA0
LCM_MAIN_CS P.4
C806
33pF_5%
0402C-S
C809
33pF_5%
0508
6
EN
4
VIN
2 5
VOUT CP
7
LED1
8
LED2
3 1
GND LED3
C805 U801
1uF_10%_10V RT9363
0402C-S RT9363
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VDD
P.4
P.4
C801
P.4
100nF_10%
P.4
0402C-S
P.4
P.4
P.4
P.4
P.4
P.4
P.4
P.4
C803
1uF_10%_16V
0603C-S
LED1
LED2
LED3