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POWER OFF Mode
D.
i.
After POWER ON procedure finished, the signal of Keypad and remote control will transform to
PW328 for further processing. U41 chip did not handle the signal of Keypad and remote control any
more. When the system receives the power off order by Power Key of remote control or Power
ON/OFF of the keypad. Firstly PW328 will send current screen status to memory U30 via I2C bus,
then the PWRDOWN I/O port of PW2030 will send a Hi signal to U48 closing the Switching
P{9}
PWRDOWN
Antenna Circuit:
Tuner (TUV1236D) has two RF inputs. Left was the connector of Terrestrial input ; Right was the connector of CATV
Input.
Terrestrial Input Connector
A.
Connects to your ATSC antenna and receives broadcasting signals. There are two signals ; Analog TV
(NTSC signal) and Digital TV (ATSC signal) could be received.
Analog TV NTSC signal
Tuner TUV1236D receive the signal come from RF NTSC signal Selects desired channel and
demodulate image composite signal (signal mark T1CVBS) by pin 14 of Tuner output to U18 PW328
decoder via path C174 and audio SIF signal (signal mark T1SND) by pin15 of Tuner output to U27
MSP4440K via C322 for demodulating MTS/SAP of Digital TV signal (ATSC
Tuner TUV1236D receive the signal come from ATSC signal Selects desired channel and converts
analog signal into MPEG Transport Stream via Tuner TS1( Transport stream TS1DATA0-TS1DATA7)
bus into U29 PWM2030 to separates MPEG video and AC3 digital
ViewSonic Corporation
V5up
R357
10K
R301
1K
1
C483
POWER OFF=Lo
100U
11
U41
SM5964C40J
43
P0.0/AD0
42
P0.1/AD1
41
P0.2/AD2
40
P0.3/AD3
V5up
39
P0.4/AD4
38
P0.5/AD5
37
P0.6/AD6
36
P0.7/AD7
R299
10K
2
P1.0
3
P1.1
4
P1.2
5
P1.3
6
Q11
P1.4
7
MMBT3906
P1.5
8
P1.6
9
P1.7
21
XTAL1
20
XTAL2
35
EA/VPP
10
RST
audio.
Confidential - Do Not Copy
power.
V5up
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
P3.2/INT0
15
P3.3/INT1
16
P3.4/T0
17
P3.5/T1
18
P3.6/WR
19
P3.7/RD
33
ALE/PROG
32
PSEN
signal).
N4261w-1M
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