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Power On/Off Sequence
1. Hardware Power ON
When power cord is plugged into AC socket, SMPS starts work and provides U105 and U106 with
VCC5V. When VCPU inputs to U105, U105 resets circuit active, sets U105 all registers to preset
modes, and then U105 #43 sends out a HWRESET signal voltage to reset U104, and then monitor
goes into stand-by mode. That means hardware power on has been completed.
2. Software Power ON/OFF
When press power key, U105 #24 recieves low pulse, and sends out "Power on/off" order back to
U104, and then U104 will do the power on/off.
- If Power ON, U105 #6 (LED_Green) will send out High potential, and then LED green on.
- If Power OFF, U105 #7 (LED_Orange) will send out High potential, and then LED Orange on.
The Panel_Vcc, Backlight_En, CLK/DATA output to panel will follow the following sequency.
T1 (ms)
0.1~10
AC Outlet Pin Assignment
1
2
P801
ViewSonic Corporation
T2 (ms)
T3 (ms)
0~10
>200
Pin
1
2
3
T4 (ms)
T5 (ms)
>100
0~50
Symbol
Description
L
Live
N
Neutral
E
GND
Confidential - Do Not Copy
20
T6 (ms)
T7 (ms)
0.1~10
>1000
VA702-2_VA721-3_VA721b-3
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