Dell E2209Wf, Руководство по обслуживанию

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Service Manual
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- U105 (TSUMU58EHJ-LF-2) #73 output PPWR ”H” potential to make Q104 conducted, and then
make Q101 conducted, +5V flow to CN103#1~#3 as Panel Vdd .
- U105 (TSUMU58EHJ-LF-2) #109 output CCFL_ON/OFF ”L” potential to control Inverter on/off.
- U105 (TSUMU58EHJ-LF-2) #125 outputs Brightness “PWM” signals to control CCFL brightness.
- TCLK by Crystal 14.318MHz input to U105 (TSUMU58EHJ-LF-2) #128/#127.
- U105 (TSUMU58EHJ-LF-2)#108 is RESET signals input pin
Please refer to U105 (TSUMU58EHJ-LF-2) Pin Assignments table in page
2.3.5 Regulator Circuit
- +3.3V is generated from Regulator U101 which is supplied by+5V via R101 and through C104
filtering,
-+1.8V is generated from Regulator U102 which is supplied by+3.3V through C106 filtering,
3. FACTORY PRESET TIMING TABLE
Standard Resolution Horizontal Frequency
(KHz)
Vertical Frequency (Hz)
720 x 400 31.469 70.087
640 x 480 31.469 59.940
640 x 480 37.500 75.000
800 x 600 37.879 60.317
800 x 600 46.875 75.000
1024 x 768 48.363 60.004
1024 x 768 60.023 75.029
1152 x 864 67.500 75.000
1280 x 1024 64.000 60.000
1280 x 1024 79.976 75.025
VESA
1680 x 1050 65.160 60.0
IBM DOS 720 x 400 31.469 70.087
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 U105. When DC_3.3V input to
U105 and U105 reset circuit active, U105 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, U105 #4 receives low pulse, then U105 (TSUMU58EHJ-LF-2) will be wake
up and send control signals(at 73,109pin) 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, U105 #123 (LED_blue) will send out low potential, and then LED blue on.
- If power saveing, U105 #124 (LED_Amber) will send out low potential, and then LED Amber on.
- If power ON or power saveing, when press power key, U105 #4 receives low pulse, then U105 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.