Ac Outlet Pin Assignment - ViewSonic VA702-1 Service Manual

4. Power On/Off Sequence
4.1 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.
4.2 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

5. AC Outlet Pin Assignment

1 2
P801
6. Inner Connector Pin Assignment
6.1 CN501, CN502, CN503, CN504 (Connect to Panel Backlight, SM02B-BHSS-1-TB or equivalent)
Pin Symbol
1
2
6.2 CN101 (Power BD to Interface BD)
Pin
Symbol
No.
1,2 +5V (VCC5V)
3,6 GND
ViewSonic Corporation
T2 (ms) T3 (ms)
0~10 >200
Pin
1
2
3
H.V.
L.V.
+5.2V output
Ground
T4 (ms) T5 (ms)
>100 0~50
Symbol Description
L
N
E
Description
High voltage for lamp
Low voltage for lamp
Description
Confidential - Do Not Copy
21
T6 (ms) T7 (ms)
0.1~10 >1000
Live
Neutral
GND
VA702-1_VA702b-1