Acer AL2017 Manuale di servizio - Pagina 8
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1.2.2 DVI CAPTURE
- Differential Signal input RX0+,RX0-,RX1+,RX1-,RX2+,RX2-,RXC+,RXC- through CN102
#18,#17,#10,#9,#2,#1,#23,#24 via R130, R131, R132, R133, R134, R135, R137, R138 enter into
U104 Digital input terminal #45,#46,#42,#43,#39,#40,#48,#49, and then TSUM56AWHK deals with
signal internally.
- Signal DDC_SCL (series clock) inputs via CN102#6, and then passes through ZD106 Zener for ESD
protection, via R126, goes into EDID EEPROM IC U101 #6.
- Signal DDC_SDA (series data) inputs via CN102 #7, and then passes through ZD107 Zener for
ESD protection, via R127, goes into EDID EEPROM IC U101 #5.
- CN102 #16 is defined as cable detect pin, this detector realize passes through R125 ,go into U104#27,
and D106 is ESD protector.
- U101 +5V is supplied by PC via CN102#14 with ZD108 for ESD protection, or supplied by Monitor
self via D107.
- U102 is an EEPROM IC which is memory and EDID data saved in it.
1.2.3 Buttons Control
- Button "Power" on front of bezel connects to scaler TSUMU58WHJ pin #4 through R159, via
CN102#8.
- Button "MENU" on front of bezel connects to scaler TSUMU58WHJ pin #119 through R153,via
CN102#1; Button ">" (Rihgt) on front bezel connects to scaler TSUMU58WHJ pin #120 through
R154,via CN102#2; Button "<" (Left) on front bezel connects to scaler TSUMU58WHJ pin #121
through R155,via CN102#3;Button "AUTO" on front bezel connects to scaler TSUMU58WHJ pin
#122 through R156,via CN102#4;
- U107 is an EEPROM IC which memory OSD setting and save the value adjusted by user.
- LED Indicator
When monitor normally working, scaler TSUMU58WHJ pin #124 sends out a low potential, via
R107, switch on Q105, then flows to CN102 #7, LED Green ON.
When in "Suspend" mode, scaler TSUMU58WHJ pin #123 sends out a low potential, via R102,
switch on Q102, then flows to CN102 #5, LED Amber ON.
1.2.4 Scaling IC (U104 tsum56AWHK)
- U104 #105~#114 output 8 bit even LVDS digital data to panel control circuit through CN106.
- U104 #118~#127 output 8 bit odd LVDS digital data to panel control circuit through CN106.
- U104 #75 output "H" potential to make Q106 conducted, and then make Q103 conducted, +5V flow
to CN106#1~#3 as Panel Vdd .
- U104 #20 output,"L" "H" potential to control Inverter on/off.
- U104 #21 outputs Brightness "PWM" signals to control CCFL brightness.
- TCLK by Crystal 14.318MHz input to U104 #32.
Please refer to tsum56AWHK Pin Assignments table in page
1.2.5 Regulator Circuit
- +5V is from powerboard CN103 #1 and CN102
- +3.3V generates from +5V through D116 and C168 filtering and U103 which is output +3.3V LDO
- +1.8V generates from +3.3V through C143 filtering and U108 which is output +1.8V LDO, for U104
used.
1.3 Inverter circuit
Power supply 5V then pass through R517 to IC501. The extra PWM pulse signal
(BRIGHTNESS signal) input to control IC through R512, R514, C510, The LCT pin is set to a DC
voltage of 0.7V by using a resistor divider(R507, R516), change the duty of PWM pulse, will
regulate the lamp current. The ON/OFF voltage connect to pin10 of IC501 through D501, R501,
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Service Manual