Ballast Turn On Signals - LG 42LH50 Training Manual

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
POWER SUPPLY
BALLAST
SECTION
To Backlights
1.2Kv
P402
P401
Hot Gnd
Ballast
Power
380V
160V
On Back of PWB
IC600
Ballast Control IC
Drive Control
VBR-A (Analog Dimming)
This line is a fixed voltage and not used.
P201
7 8
Stand By 5V
Reg
9 10
20
On Back of PWB
IC301
Controller
2
380V
Reg
12V
13
Reg
160V
14
Reg
24V
17
Reg
18
22
24
21
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
P2400
7 8
STBY5V
R2421
9 10
100Ω
L2401
20
3.8V INV On/Off
PWR
2
4.89V
13
12V
14
17
STBY5V
24V
18
0V
R2424 100Ω
ERR
22
PWM-DIM
24
L2404
A-DIM
21
1.67V
L2426
33
MAIN PWB
R2425
1KΩ
+5V
R2426 R2468
R3269
1KΩ 0Ω
100Ω
Q2408
Q2407
R2427 R2431
R3286
100Ω
Q2409
R3289 100Ω
R138 100Ω
R2407 0Ω
GPIO-24
GPIO-09
R2404 4.7KΩ R143 100Ω
IC3202
Micro
34 INV-On/Off
32
Power On/Off
31 Error Out
IC100
BCM
P-DIM
A-DIM