LG KF750 Service Manual page 43

3. TECHNICAL BRIEF
3.1.14 Multi EL lighting
There are 13 EL lighting channel. Each lighting channel is operated independently. EL
controller(U901) control AC generator and EL driver(U900). AC generator generate 190V AC signal.
And this 190V AC signal is switched by EL driver. Through EL driver, AC signal of the each lighting
channel is switched independently. Finally, switched AC signal illuminate EL sheet.
TOUCH_3.1V
TP902
1
P0_1 P0_0
2
P2_7 P2_6
3
P2_5 U901 P2_4
4
P2_3 CY8C21434 P2_2
5
P2_1 P2_0
6
P3_3 P3_2
7
P3_1 P3_0
8
P1_7 XREX
EL controller
LGE Internal Use Only
VREG_6.1V
C902
2.2u
L900
100uH
D901
RF051VA2S
D1 D2 D3 D4 D5
Q900
SIA450DJ
G
C903
470pF
S1 S2
R912
100K
24
23
22
21
20
19
18
17
TOUCH_RST
TOUCH_BUTTON_SCL
TOUCH_BUTTON_SDA
TOUCH_SCREEN_SCL
TOUCH_SCREEN_SDA
I2C
AC generator
Figure 3-1-16. Multi EL lighting
- 44 -
C905 C906
150p 0.1u
TOUCH_3.1V
33
SLUG
25
NC5
23
NC4
18
NC3
16
NC2
13
NC1
21
_POL
22
_LE
15
GND
24
DOUT
TP905
TP906
TP907
19
CLK
17
DIN
ISSP 20
VDD
C907
0.1u
EL driver
Copyright © 2008 LG Electronics. Inc. All right reserved.
U900
HV509
28
BP
27
HVGND
TP903
29
HVOUT16
BP
30
HVOUT15
31
HVOUT14 HV_OUT_14
32
HVOUT13 HV_OUT_13
1
HVOUT12 HV_OUT_12
2
HVOUT11 HV_OUT_11
3
HVOUT10 HV_OUT_10
4
HVOUT9 HV_OUT_9
5
HVOUT8 HV_OUT_8
6
HVOUT7 HV_OUT_7
7
HVOUT6 HV_OUT_6
8
HVOUT5 HV_OUT_5
9
HVOUT4 HV_OUT_4
10
HVOUT3 HV_OUT_3
11
HVOUT2 HV_OUT_2
12
HVOUT1
14
VPP
26
VBIAS
EL lighing channel
output (connected with
EL sheet)
Only for training and service purposes