BenQ G700 Service Manual page 32

BenQ G700
into U103#24.
- U108 power is supplied by PC via CN103#9, or supplied by Monitor self via D103.
- U108 is an EEPROM IC which is memory and EDID data saved in it.
5.3.1.2 Buttons Control
- Button "Power" on bottom side bezel connects to U103 (scaler) # 9 through R133, via CN102#8.
- Button "UP" "DOWN ""MENU" "ENTER" on bottom side bezel connects to U103 (scaler)
#21,#22,#14 through R138,R139,R140 via CN102 #1, #2,#3
- U104 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", U103 (scaler) #48 sends out a low potential, via R105, flow to
CN102 #7 on keypad, LED Green ON.
b. When in "Suspend" mode, U103 (scaler) #1 sends out a low potential, via R107, flows to
CN102 #5 on keypad, LED Amber ON.
5.3.1.3 Realtek CHIP U106 (scaler), and U103(MCU)
- U106 (RTD2525LH ) #29. #30. #31~#38 output 8 bit even LVDS digital data to panel control circuit
through CN104.
- U106 (RTD2525LH) #21~#30 output 8 bit odd LVDS digital data to panel control circuit through
CN104.
- U103 (RTD2120_LQFP48 ) #44 outputs Brightness "PWM" signals to control CCFL brightness.
- U103 (RTD2120_LQFP48 ) #39 output PANELPOWER ON/OFF to make Q112 conducted, and
then make Q110 conducted, +5V flow to CN105#1~#3 as Panel VDD .
- U103 (RTD2120_LQFP48 ) #46 output CCFL_ON/OFF "H" and "L" potential to control Inverter
on/off.
Please refer to RTD2120_LQFP48 Pin Assignments table in IC spec.
5.3.1.4 Regulator Circuit
- +5V is from switching mode power supply for Panel used.
- +3.3V generates from +5V through C103 filtering and U102 which is output +3.3V LDO for U105,
U106,U103 and U104 used.
- +1.8V generates from +3.3V through C138 filtering and U105 which is output +1.8V LDO.
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Service Manual