The vga modul can't tobe start power "on",power regulator/switching normal condition. some of the semiconductors on board of the VGA modul ( transistor ) is Shock/dead. I need schema/diagram of this,please........
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I have had this problem before and had to contact the manufacturer. I was able to send them back and the manufacturer sent me a replacement. If your monitor is under warranty it should not cost you anything.
BenQ made a lot of monitors for Dell. You may want to look at Dell pictures. Most common failure in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what goes wrong: http://s807.photobucket.com/home/budm/allalbums Post back what you see inside so we can guide you further and it will help out other people in the future also. http://www.badcaps.net http://en.wikipedia.org/wiki/Capacitor_plague
There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc. http://en.wikipedia.org/wiki/Capacitor_plague Please post back what you find.
When you first switch on Does it show Benq?If not the inverter circuit has failed.If you are technically able you can try resoldering transistors on inverter board.If your display is black all of the time transistors could have failed as also related fuse etc.
And yes please check with BenQ Normally these have a 3 year warranty.
If it is still under warranty from Benq (3yrs), call them for a return. I have one (FP731) and did the same thing. There is an IC within the monitor that is bad. Pretty soon there will be nothing on the screen.