Acer AL1717 Service Manual - Page 8

Browse online or download pdf Service Manual for Monitor Acer AL1717. Acer AL1717 41 pages. Diagonal 431.8mm (17 inch) lcd display
Also for Acer AL1717: User Manual (16 pages), Specifications (2 pages), User Manual (10 pages), Quick Start Manual (2 pages), Quick Start Manual (2 pages)

Print Page
Acer AL1717 Service Manual
Acer
TSUM56AL deals with signal internally. TVS101, TVS102, TVS103 are ESD protector to
prevent U105 from ESD.
- Signal DDC_SCL (series clock) inputs via CN103#15, and then passes through ZD101 Zener for
ESD protection, goes into U105 #31.
- Signal DDC_SDA (series data) inputs via CN103#12, and then passes through ZD107 Zener for
ESD protection, goes into U105 #30.
- Signal TTL vertical sync. (Vsync) inputs via CN103 #14, and then clamped by ZD105 Zener,
passes through R129, and then goes into IC U105 (TSUM56AL) #28.
- Signal TTL horizontal sync. (Hsync) inputs via CN103 #13, and then clamped byZD106 Zener,
passes through FB101,R130, and then goes into IC U105 (TSUM56AL) #27.
- CN103#5 is defined as cable detect pin, this detector realize passes through R122 Pull hight, go
into U105#35.
- U103 power is supplied by PC via CN103#9, or supplied by Monitor self via D103.
- U103 is an EEPROM IC which is memory and EDID data saved in it.
3.2.2 Buttons Control
- Button "Power" on right side bezel connects to U105 (TSUM56AL) #88 through R161, via
CN105#4.
- Button "UP" "DOWN ""MENU" "AUTO" on right side bezel connects to U105 (TSUM56AL)
#91,#90,#89,#92 through R158,R159,R160,R157,via CN105 #7, #6, #5, #8.
- U108 is an EEPROM IC which memory OSD setting and save the value adjusted by user.
- LED Indicator on Front Bezel
a. When press button "power", U105 (TSUM56AL) #42 sends out a low potential, via R188,
flow to CN105 #2 on keypad, LED Blue ON.
b. When in "Suspend" mode, U105 (TSUM56AL) #41 sends out a low potential, via R189, flows
to CN105 #1 on keypad, LED Amber ON.
3.2.3 Mstar CHIP U105 (TSUM56AL)
- U105 (TSUM56AL) #54. #55. #58~#65 output 8 bit even LVDS digital data to panel control
circuit through CN104.
- U105 (TSUM56AL) #67~#74. #77. #78 output 8 bit odd LVDS digital data to panel control
circuit through CN104.
- U105 (TSUM56AL) #86 outputs Brightness "PWM" signals to control CCFL brightness.
- U105 (TSUM56AL) #48 output PPWR "H" potential to make Q103 conducted, and then make
Q101 conducted, +5V flow to CN104#1~#3 as Panel VDD .
- U105 (TSUM56AL) #85 output CCFL_ON/OFF "H" potential to control Inverter on/off.
- TCLK by Crystal 14.318MHz input to U105 (TSUM56AL) #96,#97.
Please refer to TSUM56AL Pin Assignments table in page
3.2.4 Regulator Circuit
- +5V is from switching mode power supply for Panel used.
- +3.3V generates from +5V through C101 and C103 filtering and U101 which is output +3.3V
LDO for U103, U106,U108 and U105 used.
- +1.8V generates from +5V through C101 and C103 filtering and U102 which is output +1.8V
LDO, for U105 used.
3.2.5 Audio circuit
- Audio Signal R,L,GND input through P701,#2,#5,#1, Stop DC via C711, C712, and then enter
into U701 (TDA7496L) analog input terminal #4,#9.
- U701 (TDA7496L) #14,#17 output R,L audio data to Speaker through CN701.
- U105 (TSUM56AL) #94 output MUTE "H" potential to control U701on/off.
- U105 (TSUM56AL) #93 outputs Volume "PWM" signals to control U701 Volume.

4. Inverter circuit

4.1 Low voltage to high voltage circuit
7
Service Manual