PWM-DIM (PWM Dimming) Manipulates the
Backlight Brightness via Customer’s OSD.
Manipulates the Backlight Brightness via the
Video Processor chip. Darker Picture,
Darker Backlights to facilitate improved
Contrast Ratio. 0.6V ~ 3.3V Range
42LH50 P2400 ON MAIN PWB TO SMPS P201 TURN ON CIRCUIT
42LH50 P2400 ON MAIN PWB TO SMPS P201 TURN ON CIRCUIT
R143
R138
100
Ω
100
R2421
R2404
C2410
15pF
P2400
12V
12V
Gnd
Gnd
Gnd
Gnd
0V
3.38V
4.98V
1.8V
P201
ERR Out
PWR
A.DIM
INV.On
PWM-DIM
n/c
SMPS
E22
GPIO-24
100
Ω
n/c
Gnd
Gnd
Gnd
Gnd
Analog Dimming (Fixed Value)
100
Ω
33
R3286
100
P5.4
SBY5V
MAIN PWB
5V
5V
5V
5V
Gnd
Gnd
12V
2
1
4
3
6
5
8
7
10
9
11
12
14
13
16
15
18
17
20
19
22
21
23
24
2
1
4
3
6
5
8
7
10
9
11
12
14
13
16
15
18
17
20
19
22
21
23
24
21.3V
24V
Gnd
Gnd
Gnd
Gnd
Gnd
Gnd
n/c
n/c
n/c
n/c
32
P5.4
L2405
L2406
24V
C2400
68uF
C2404
1uF
L2402
12V
C2406
220uF
L2401
R2431
R3286
34
R2426
10KΩ
Q2408
R2468
0Ω
R2425
1KΩ
P5.3
R3269
100Ω
+5V
Inverter Ctl
3
1
2
6
5
8
7
Q2406
+5V
L2411
LVDS 12V Panel Power
Q2402
R2402
10KΩ
0.2V
0.6V
4
Q2404
Panel Control
0V
0.6V
12V
R2416 47KΩ
R2417 47KΩ
R25
Digital Dimming (Variable)
68uF
STBY5V
L2404
R2470
0
L2426
Power On/Off1
A-DIM
P-DIM
STBY5V
4.7K
C2433
1uF
C2401
1uF
21.3V
3.8V
0Ω
PG 26
Q2407
L2400
5.2V
n/c
n/c
INV ON/OFF
PWR ON
A-DIM
PWM-DIM
R2424
100Ω
P5.6
Error Out
Stby = 5V Run = 0V
Error 5V: Normal 0V:
Lamps try to fire 4 time,
if Error line is high, Micro
shuts off television.
Q2409
IC3202
Sub
Micro
Power On/Off1
R3289
100Ω
IC100
BCM
31
Power Det
29
Reset
27
Key 1
17
Key 2
28
LED Pwr On
39
LED Warm Stby
41
GPIO-09
R2427
33K
Error Out
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