Circuit Operation Theory - BenQ Q7C3 Service Manual

Q7C3 LCD Monitor Service Guide
I. Introduction:
The Q7C3 (FP756) is a 17" SXGA (1280x1024) , 262 K colors(R, G, B 6-bit data) TFT LCD
monitor without multi-media function. It's an analog interface LCD monitor with a 15 pins D-sub signal
cable and it's compliant with VESA specification to offer a smart power management and power saving
function. It also offers OSD menu for users to control the adjustable items and get some information
about this monitor, and the best function is to offer users an easy method to set all adjustable items
well just by pressing one key, we called it "Auto key" which can auto adjusting all
controlled items. Q7C3 (FP756) also offer DDC2 function to meet VESA standard.
II. Block diagram
The Q7C3 (FP756) consists of a head and a stand (base). The head consists of a LCD module
with 4 lamps, a power board (include AC/DC, DC/DC and inverter board), a control board and interface
BD. The block diagram is shown as below.
III. Circuit operation theory:
A.) HEAD:
A-1.) Interface board diagram:

Circuit Operation Theory

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