BenQ Q7T3-FP737S, Service Manual

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Q7T3-FP737S Dual function LCD Monitor Service Guide
Circuit Operation Theory
1
Confidential
I. Introduction:
The Q7T3-FP731-D is a 17” SXGA (1280x1024) , 262 K colors(R, G, B 6-bit data) TFT LCD
monitor with multi-media function. It’s an Dual (analog and digital) interface LCD monitor with a 15 pins
D-sub signal cable and a 24pins DVI-D cable . 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-FP731-D also offer DDC2 function to meet VESA standard.
II. Block diagram
The Q7T3-FP731-D 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:
Control board
Interface board
LCD module with 4 lamps (backlight)
AC power in
D-Sub DVI-D
Inverter
Power