Dell 1909Wf Service Manual

Contents

Dell 1909Wf Service Manual Manual pdf 16 page image

Service Manual15and through C101 filtering, C102 and C105 is 3.3V which supplies toU102、U106、U103、U201、U105、U108output filtering.- +1.8V is generated from Regulator U102 which is supplied byU101-3.3Vthrough C106 filtering.TheU102 output1.8V via FB105 send to U105.3. FACTORY PRESET TIMING TABLEStandard Resolution HorizontalFrequency (KHz)VerticalFrequency (Hz)VESA640 x 480 31.469 59.940640 x 480 37.500 75.000800 x 600 37.879 60.317800 x 600 46.875 75.0001024 x 768 48.363 60.0041024 x 768 60.023 75.0291152x864 67.500 75.0001280x1024 48.483 60.0421280x1024 60.087 75.0341440x900 55.935 59.887IBM DOS 720 x 400 31.469 70.0874. Power On/Off SequencyHardware power On/OffWhen 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 registerswill be set to default, that means finish hardware power on.When pull out power cord from AC socket,the system shut down instantly for nosupplySoftware power On/Off- When press power key, U105 #4 receives low pulse, thenU105(TSUM5PEHJ-LF) will be wake up and send control signals(at 109,73pin)to on CCFL and switch 5.0v to panel module, at the same time,U105 make theVGA/DVI cable input signal source display normal on panel if the VGA/DVIcable input signal is active- If power ON, U105 #123 (LED_blue) will send out low potential, and then LEDblue on.- If power saveing, U105 #124 (LED_Amber) will send out low potential, andthen LED Amber on.- If power ON or power saveing, when press power key, U105 #4 receives lowpulse, then U105 will be sleeping and turn off backlight, at the same time, thepanel will lose +5V.The Panel_Vcc, Backlight_En, CLK/DATA output to panel will follow the followingsequency.