Factory Preset Timing Table; Power On/Off Sequency - Dell S1909WNf Service Manual

3. FACTORY PRESET TIMING TABLE

Standard
VESA
IBM DOS

4. Power On/Off Sequency

Hardware power On/Off
When power cord plug into AC socket, Power provides 16V and DC_5V.
DC_5V is main voltage for panel and Regulator U103.
DC_3.3V is coming from Regulator U103, DC_3.3v is main voltage for U104. When DC_3.3V
input to U104 and U104 reset circuit active, U104 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, U104 #23 receives low pulse, then (TSUM1PEJ-LF-2) U104 will be
wake up and send control signals(at 20,75pin) to on CCFL and switch 5.0v to panel module,
at the same time,U104 make the VGA/DVI cable input signal source display normal on panel
if the VGA/DVI cable input signal is active
- If power ON, U104 #31 (LED_green) will send out low potential, and then LED white on.
- If power saveing, U104 #35 (LED_Amber) will send out low potential, and then LED Amber
on.
- If power ON or power saveing, when press power key, U104 #23 receives low pulse, then
U104 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
640 x 480
640 x 480
800 x 600
800 x 600
1024 x 768
1024 x 768
1152x864
1280x1024
1280x1024
1366x768
720 x 400
Horizontal Frequency
(KHz)
31.469
37.500
37.879
46.875
48.363
60.023
67.500
48.483
60.087
55.935
47.712
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Service Manual
Vertical Frequency
(Hz)
59.940
75.000
60.317
75.000
60.004
75.029
75.000
60.042
75.034
59.887
59.790