BenQ Q7T3-FP737S, Service Manual

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Q7T3 (CPT panel) LCD Monitor Service Guide
Circuit Operation Theory
1
I. Introduction:
The Q7T3-CPT is a 17” SXGA (1280x1024) , 26.2 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. Q7T3-CPT also offer DDC2 function to meet VESA standard.
II. Block diagram
The Q7T3-CPT 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: