Factory Preset Timing Table; Regulator Circuit; Main Chip U105 - Dell 2209WA Service Manual

Service Manual
- LED Indicator on Front Bezel
a. When press button "power", U105 (TSUMU58EHJ-LF) #123 be send in low
Voltage, make Q107#3 sends out high Voltage to CN104#5 , and then to
keypad, LED blue on.
b. When in "Suspend" mode, U105 (TSUMU58EHJ-LF) #124 sends out a low
Voltage, make Q108#3 sends out high Voltage to CN104#7 , and then to
keypad, LED Amber on.
2.3.4 MAIN CHIP U105 (TSUMU58EHJ-LF)
- U105 (TSUMU58EHJ-LF ) #86~#77 output 8 bit even and #100~#91 output 8
bit odd LVDS digital data to panel control circuit through CN103.
- U105 (TSUMU58EHJ-LF ) #50 output "H" potential to make Q104
conducted, and then make Q101 conducted, +5V flow to CN103#1~#3 as
Panel Vdd .
- U105 (TSUMU58EHJ-LF) #109 output CCFL_ON/OFF "H" potential to
control Inverter on/off.
- U105 (TSUMU58EHJ-LF) #110 output "H" potential to control Inverter
power on/off.
- U105 (TSUMU58EHJ-LF) #125 outputs Brightness "PWM" signals to control
CCFL brightness.
- TCLK by Crystal 14.318MHz input to U105 (TSUMU58EHJ-LF) #128.
- U105(TSUMU58EHJ-LF) #108 is RESET signals input pin
Please refer to TSUMU58EHJ-LF Pin Assignments table in page

2.3.5 Regulator Circuit

- +5V is from switching power supply .
- +3.3V is generated from Regulator U101 which is supplied by+5V via R101
and 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 byU101-3.3V
through C106 filtering.TheU102 output1.8V via FB105 send to U105.

3. FACTORY PRESET TIMING TABLE

Standard
VESA
Resolution
Frequency (KHz)
640 x 480
640 x 480
800 x 600
800 x 600
1024 x 768
1024 x 768
1152x864
1280x1024
1280x1024
1680x1050
20
Horizontal
Frequency (Hz)
31.469
37.500
37.879
46.875
48.363
60.023
67.500
48.483
60.087
55.935
Vertical
59.940
75.000
60.317
75.000
60.004
75.029
75.000
60.042
75.034
59.887