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4. Circuit Description
Power Circuit:
Switching mode power supply provided 3 sets of Vcc power supply +5V, +12V and +24V. The
Details please refer to page 26 of schematic.
Vcc +5V : supply to Stand-By U48 chip and Main Board or Panel
Vcc +12V : supply to Audio Processor, Audio Class-D AMP or Panel LVDS.
Vcc +24V : supply to Panel's inverter.
Cold-Opening Mode
A.
i.
Switching power will produce +5V when plug in and transmit to the Vsub pin of Stand-By U41 chip
via J17.
Vsub
+5V Always on
ii.
This machine is in Stand-By Mode now.
Stand-By Mode(+5V)
B.
i.
When this machine is in Stand-By mode, only
assure the consumption power is < 1.0W in Stand-by Mode.
C. Power ON Mode(+5V ,+12V)
i.
Receives the start order
When the system receives the start order by Power Key of the remote control
or Power ON/OFF of the control panel signal mark PWSW , it will process the following action.
PWSW
ViewSonic Corporation
All manuals and user guides at all-guides.com
V12IN
R318
R319
V5up
U41
43
P0.0/AD0
42
P0.1/AD1
41
P0.2/AD2
40
P0.3/AD3
39
P0.4/AD4
38
P0.5/AD5
37
P0.6/AD6
36
P0.7/AD7
2
P1.0
3
P1.1
4
P1.2
5
P1.3
6
P1.4
7
P1.5
8
P1.6
9
P1.7
21
XTAL1
20
XTAL2
35
EA/VPP
10
RST
7
LVDS.
0_NC
0
U41
SM5964C40J keep working, so the system can
SM5964C40J
24
P2.0/A8
25
P2.1/A9
26
P2.2/A10
27
P2.3/A11
28
P2.4/A12
29
P2.5/A13
30
P2.6/A14
31
P2.7/A15
11
P3.0/RXD
13
P3.1/TXD
14
R307
P3.2/INT0
15
P3.3/INT1
16
P3.4/T0
17
C484
P3.5/T1
18
.01
P3.6/WR
19
P3.7/RD
33
ALE/PROG
32
PSEN
Confidential - Do Not Copy
J11
1
2
3
4
5
6
7
8
9
10
11
12
13
signal mark IRup
V5up
R304
3.3K
3.3K
IRup
N4261w-1M
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