Service manual

4.4 Power On/Off Sequence

4.4.1 Hardware Power ON

When power cord is plugged into AC socket, SMPS starts work and provides U105 with VCC5V. When

VCC5V inputs, U105 resets circuit active, sets U105 all registers to preset modes, and then monitor goes into

stand-by mode. That means hardware power on has been completed.

4.4.2 Software Power ON/OFF

When press power key, U105 # 74 recieves low pulse,and then U105 will do the power on/off.

- If Power ON, U108 # 103(LED_Blue) will send out Low potential, and then LED Blue on.

- If Power OFF, U108 # 103(LED_ Blue) will send out High potential, and then LED Off.

The Panel_Vcc, Backlight_En, CLK/DATA output to panel will follow the following sequency.

T1 (ms) T2 (ms) T3 (ms) T4 (ms) T5 (ms) T6+T7 (ms)

0.5~10 0~50 500 90 0~50 500

4.4.3 AC Outlet Pin Assignment

Pin Symbol Description

1 L Live

2 N Neutral

3 E GND

P801

1 2

ViewSonic Corporation

VX2433wm-1

VX2433wm-CN

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