Dell E1909W Service Manual

Also see for Daily Deal E1909W: Setting up User guide

Dell E1909W Service Manual Manual pdf 12 page image

Service Manual11- Button “Menu” on front bezel connects to U105 (TSUM5PEHJ-LF-2) #50 through CN104 #1, U105#50 Voltage is defined as “Menu”.- Button “SELECT” on front bezel connects to U105 (TSUM5PEHJ-LF-2) #122 through CN104 #4,U105 #122 Voltage is defined as “SELECT”.- LED Indicator on Front Bezela. When press button “power”, U105 (TSUM5PEHJ-LF-2) #123 be send in low Voltage, makeQ107#3 sends out high Voltage , and then to CN01#5 on keypad, LED green on.b. When in “Suspend” mode, U105 (TSUM5PEHJ-LF-2) #124 sends out a low Voltage, makeQ108#3 sends out high Voltage and then to CN01 #7 on keypad, LED Amber ON.2.3.4 MATAR CHIP U105 (TSUM5PEHJ-LF-2)- U105 (TSUM5PEHJ-LF-2) #91~#100 output 8 bit even and #77~#86 output 8 bit odd LVDS digitaldata to panel control circuit through CN103.- U105 (TSUM5PEHJ-LF-2) #73 output PPWR ”H” potential to make Q104 conducted, and thenmake Q101 conducted, +5V flow to CN103#1~#3 as Panel Vdd .- U105 (TSUM5PEHJ-LF-2) #109 output CCFL_ON/OFF ”L” potential to control Inverter on/off.- U105 (TSUM5PEHJ-LF-2) #125 outputs Brightness “PWM” signals to control CCFL brightness.- TCLK by Crystal 14.318MHz input to U105 (TSUM5PEHJ-LF-2) #128/#127.- U105 (TSUM5PEHJ-LF-2)#108 is RESET signals input pinPlease refer to U105 (TSUM5PEHJ-LF-2) Pin Assignments table in page2.3.5 Regulator Circuit- +3.3V is generated from Regulator U101 which is supplied by+5V via R101 and through C104filtering,-+1.8V is generated from Regulator U102 which is supplied by+3.3V through C106 filtering,3. FACTORY PRESET TIMING TABLEStandard Resolution Horizontal Frequency(KHz)Vertical Frequency(Hz)640 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 75.034VESA1440x900 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 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 U105. When DC_3.3V input toU105 and U105 reset circuit active, U105 all registers will be set to default, that means finish hardwarepower on.When pull out power cord from AC socket,the system shut down instantly for no supplySoftware power On/Off- When press power key, U105 #4 receives low pulse, then U105 (TSUM5PEHJ-LF-2) will be wake up