LG 42LH40 - Page 33

42LH40 Ballast Control Signals Circuit Diagram
42LH40 Ballast Control Signals Circuit Diagram
33
IC100
Mstar
R743 100Ω
R719
1KΩ
R704 4.7KΩ
A-DIM
PWM-DIM
INV On/Off
3.8V
VBR-B (PWM Dimming) Manipulates the Backlight Brightness via Customer’s OSD.
Manipulates the Backlight Brightness via the Video Processor.
Darker Picture, Darker Backlights to facilitate improved Contrast Ratio. 0.6V ~ 3.3V Range
INV-On/Off
PWB-0
AB12
AB13
PWM-2
20
24
21
R189 100Ω
R185 1.2KΩ
R244
100Ω
G5
VBR-A (Analog Dimming)
This line is not used.
P700
POWER SUPPLY
RL-ON
PWR
4.89V
2
12V
Reg
24V
Reg
13
14
17
18
390V
BALLAST
SECTION
1.67V
IC301
380V
Reg
160V
Reg
ERR
0V
22
P201
MAIN PWB
20
24
21
2
13
14
17
18
22
IC600
Ballast Control IC
12V
24V
On Back of PWB
On Back of PWB
INV On/Off
To Backlights
1.2Kv
Two
Transformers
Drive Circuit
FETs Q709/10
Drive Control
Q702
R704 4.7KΩ
R759
0Ω
R714
100Ω
GPIO 134
GPIO 136
R237
100Ω
Q701
Q700
R703
R706
E5
7 8
9 10
7 8
9 10
STBY5V
STBY5V
L700
L733
Ballast
Power
Hot Gnd
P401
P402
Stand By 5V
Reg
Controller
R717
3.3KΩ
+5V General
GPIO 97
ERROR-Out
R201
100Ω
E8
0V~130V
0V~130V
Varies with
PDIM
390V