LG 42LH50 - Ballast Turn on Signals

IC3202
Micro
42LH50 P2400 on Main PWB To Power Supply P201 Ballast Turn On Circuit
42LH50 P2400 on Main PWB To Power Supply P201 Ballast Turn On Circuit
33
IC100
BCM
R2407 0Ω
R2426
1KΩ
R2404 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 BCM Chip. Darker Picture, Darker Backlights to facilitate
improved Contrast Ratio. 0.6V ~ 3.3V Range. Manipulated by the Video Processor IC100
INV-On/Off
A-DIM
GPIO-24
P-DIM
20
24
21
R138 100Ω
R143 100Ω
R3269
100Ω
34
VBR-A (Analog Dimming)
This line is a fixed voltage and not used.
P2400
POWER SUPPLY
Power On/Off
PWR
4.89V
2
12V
Reg
24V
Reg
13
14
17
18
380V
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
Q2408
R2468
0Ω
R2421
100Ω
R3286
100Ω
Q2407
Q2409
R2431
R2427
32
7 8
9 10
7 8
9 10
STBY5V
STBY5V
L2426
L2404
Ballast
Power
Hot Gnd
390V
P401
P402
Stand By 5V
Reg
Controller
R2425
1KΩ
+5V
160V
160V
L2401
GPIO-09
31
R2424 100Ω
R3289 100Ω
Error Out