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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.
ViewSonic Corporation
V12IN
PWSW
R318
0_NC
0
R319
U41
SM5964C40J keep working, so the system can
V5up
U41
SM5964C40J
43
24
P0.0/AD0
P2.0/A8
42
25
P0.1/AD1
P2.1/A9
41
26
P0.2/AD2
P2.2/A10
40
27
P0.3/AD3
P2.3/A11
39
28
P0.4/AD4
P2.4/A12
38
29
P0.5/AD5
P2.5/A13
37
30
P0.6/AD6
P2.6/A14
36
31
P0.7/AD7
P2.7/A15
2
11
P1.0
P3.0/RXD
3
13
P1.1
P3.1/TXD
4
14
P1.2
P3.2/INT0
5
15
P1.3
P3.3/INT1
6
16
P1.4
P3.4/T0
7
17
P1.5
P3.5/T1
8
18
P1.6
P3.6/WR
9
19
P1.7
P3.7/RD
21
33
XTAL1
ALE/PROG
20
32
XTAL2
PSEN
35
EA/VPP
10
RST
7
Confidential - Do Not Copy
LVDS.
J11
1
2
3
4
5
6
7
8
9
10
11
12
13
signal mark IRup
V5up
R304
3.3K
R307
3.3K
C484
.01
N4261w-1M
IRup
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