Dell E1709W - MATAR CHIP U105 (TSUM1 PER-LF-2); Regulator Circuit; 3. Factory Preset Timing Table

Service Manual
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- Button “Power” on front bezel connects to U105 (TSUM1PER-LF-2) #58 through CN104 #1,
U105 #58 is defined as power on/off.
- Button “(” on front bezel connects to U105 (TSUM1PER-LF-2) #57 through CN104 #5, U105#57
Voltage is defined as “Plus”.
- Button “(” on front bezel connects to U105 (TSUM1PER-LF-2) #57 through CN104 #5, U105 #57
Voltage is defined as “Minus”.
- Button “Menu” on front bezel connects to U105 (TSUM1PER-LF-2) #63 through CN104 #6; U105
#63 Voltages is defined as “Menu”.
- Button “ENTER” on front bezel connects to U105 (TSUM1PER-LF-2) #59 through CN104 #4,
U105 #59 Voltage is defined as “ENTER”.
- LED Indicator on Front Bezel
a. When press button “power”, U105 (TSUM1PER-LF-2) #60 be send in low Voltage, make Q107#3
sends out high Voltage , and then to CN104#3 on keypad, LED Blue on.
b. When in “Suspend” mode, U105 (TSUM1PER-LF-2) #61 sends out a low Voltage, make
Q108#3 sends out high Voltage and then to CN104 #2 on keypad, LED Amber ON.
2.3.3 MATAR CHIP U105 (TSUM1PER-LF-2)
- U105 (TSUM1PER-LF-2) #33~#40 output 8 bit even and #41~#50 output 8 bit odd LVDS
digital data to panel control circuit through CN106.
- U105 (TSUM1PER-LF-2 ) #28 output PPWR ”H” potential to make Q104 conducted, and
then make Q101 conducted, +5V flow to CN103#1~#3 as Panel Vdd .
- U105 (TSUM1PER-LF-2) #55 output CCFL_ON/OFF”L” potential to control Inverter on/off.
- U105 (TSUM1PER-LF-2) #56 outputs Brightness “PWM” signals to control CCFL brightness.
- TCLK by Crystal 14.318MHz input to U105 (TSUM1PER-LF-2) #2.
- U105 (TSUM1PER-LF-2) #54 is RESET signals input pin
Please refer to TSUM1PER-LF-2 Pin Assignments table in page
2.3.4 Regulator Circuit
- +5V is from switching mode power supply for panel
- +3.3V is generated from Regulator U101 which is supplied by+5V through C104 filtering,
C102 is 3.3V output filter ,the output 3.3V supplies toU105, U108,U106, U102.
- +1.8V is generated from Regulator U102 which is supplied byU101-3.3V through C106
filtering.The1.8V via FB105 supplies to U105.
3. FACTORY PRESET TIMING TABLE
Standard Resolution Horizontal Frequency
(KHz)
Vertical Frequency
(Hz)
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
1152x864 67.500 75.000
1280x1024 48.483 60.042
1280x1024 60.087 75.034
VESA
1440x900 55.935 59.887
IBM DOS 720 x 400 31.469 70.087