Service Manual
21
IBM DOS
720 x 400
31.469
70.087
4. Power On/Off Sequency
Hardware power On/Off
When power cord plug into AC socket, Power provides DC_5V to interface board.
DC_5V is main voltage for panel and Regulator U101.
DC_3.3V is coming from Regulator U101, DC_3.3v is main voltage for U105.
When DC_3.3V input to U105 and U105 reset circuit active, U105 all registers
will be set to default, that means finish hardware power on.
When pull out power cord from AC socket,the system shut down instantly for no
supply
Software power On/Off
- When press power key, U105 #4 receives low pulse, then
U105(TSUMU58EHJ-LF) will be wake up and send control signals(at
109,50pin) to on CCFL and switch 5.0v to panel module, at the same time,U105
make the VGA/DVI cable input signal source display normal on panel if the
VGA/DVI cable input signal is active
-
If power ON, U105 #123 (LED_blue) will send out low potential, and then LED
blue on.
-
If power saveing, U105 #124 (LED_Amber) will send out low potential, and
then LED Amber on.
-
If power ON or power saveing, when press power key, U105 #4 receives low
pulse, then U105 will be sleeping and turn off backlight, at the same time, the
panel will lose +5V.
The Panel_Vcc, Backlight_En, CLK/DATA output to panel will follow the following
sequency.
Содержание 2209WA - UltraSharp - 22" LCD Monitor
Страница 1: ...Service Manual 0 Service Manual LCD Monitor 2209WA ...
Страница 25: ...Service Manual 24 8 Key Parts Pin Assignments 8 1 U105 TSUMU58EHJ LF ...
Страница 26: ...Service Manual 25 ...
Страница 27: ...Service Manual 26 ...
Страница 31: ...Service Manual 30 ...
Страница 32: ...Service Manual 31 Chapter 4 Disassembly Assembly 1 Exploded Diagram ...
Страница 36: ...Service Manual 35 Note 1 The arrows point out the direction of assembly ...
Страница 44: ...Service Manual 43 ...
Страница 80: ...Service Manual 79 ...
Страница 81: ...Service Manual 80 Attachment 3 PCB Layout power inverter bd inverter board Top Layer Bottom Layer ...
Страница 82: ...Service Manual 81 Main board Top Layer ...
Страница 83: ...Service Manual 82 Bottom Layer ...
Страница 84: ...Service Manual 83 Keypad USB convert board ...
Страница 85: ...Service Manual 84 ...