Factory Preset Timing Table; Power On/Off Sequency - Dell 2208WFP Service Manual

-+1.8V is generated from Regulator U102 which is supplied by+3.3V through C106 filtering,

3. FACTORY PRESET TIMING TABLE

Standard
720 x 400
640 x 480
640 x 480
800 x 600
800 x 600
1024 x 768
VESA
1024 x 768
1152 x 864
1280 x 1024
1280 x 1024
1680 x 1050
IBM DOS 720 x 400

4. Power On/Off Sequency

Hardware power On/Off
When power cord plug into AC socket, Power provides 26V and DC_5V.
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 U108. When DC_3.3V input to
U108 and U108 reset circuit active, U108 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, U108 #9 receives low pulse, then U108(RTD2122L) will be wake up and send
control signals(at 20,39pin) 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, U108 #1 (LED_GREEN) will send out low potential, and then LED GREEN on.
- If power saveing, U108 #48 (LED_Amber) will send out low potential, and then LED Amber on.
- If power ON or power saveing, when press power key, U108 #9 receives low pulse, then U108 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.
Resolution Horizontal Frequency
31.469
31.469
37.500
37.879
46.875
48.363
60.023
67.500
64.000
79.976
65.160
31.469
(KHz)
70.087
59.940
75.000
60.317
75.000
60.004
75.029
75.000
60.000
75.025
60.0
70.087
16
Service Manual
Vertical Frequency (Hz)