Dell 2209WA Service Manual

Also see for 2209WA - UltraSharp - 22" LCD Monitor: Setup guide Datasheet User guide Setup guide

Contents

Dell 2209WA Service Manual Manual pdf 21 page image

Service Manual20- LED Indicator on Front Bezela. When press button “power”, U105 (TSUMU58EHJ-LF) #123 be send in lowVoltage, make Q107#3 sends out high Voltage to CN104#5 , and then tokeypad, LED blue on.b. When in “Suspend” mode, U105 (TSUMU58EHJ-LF) #124 sends out a lowVoltage, make Q108#3 sends out high Voltage to CN104#7 , and then tokeypad, LED Amber on.2.3.4 MAIN CHIP U105 (TSUMU58EHJ-LF)- U105 (TSUMU58EHJ-LF ) #86~#77 output 8 bit even and #100~#91 output 8bit odd LVDS digital data to panel control circuit through CN103.- U105 (TSUMU58EHJ-LF ) #50 output ”H” potential to make Q104conducted, and then make Q101 conducted, +5V flow to CN103#1~#3 asPanel Vdd .- U105 (TSUMU58EHJ-LF) #109 output CCFL_ON/OFF ”H” potential tocontrol Inverter on/off.- U105 (TSUMU58EHJ-LF) #110 output ”H” potential to control Inverterpower on/off.- U105 (TSUMU58EHJ-LF) #125 outputs Brightness “PWM” signals to controlCCFL brightness.- TCLK by Crystal 14.318MHz input to U105 (TSUMU58EHJ-LF) #128.- U105(TSUMU58EHJ-LF) #108 is RESET signals input pinPlease refer to TSUMU58EHJ-LF Pin Assignments table in page2.3.5 Regulator Circuit- +5V is from switching power supply .- +3.3V is generated from Regulator U101 which is supplied by+5V via R101and 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 75.0341680x1050 55.935 59.887