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A professional TV/video repair-person knows how to open it, how to order the correct replacement part, and how to reassemble and test it. This is not a "do-it-self" repair, like changing batteries in a flash-light.
The backlight is located inside the monitor behind the LCD screen, it looks like a thin florescent bulb. I would recommend not replacing it and just replacing the monitor. The bulb is cheap probably between 10 to 30 dollars, but you also may need the EMI kit, and with your labor involved you may not be saving any money. Also if you don't get the correct bulb you may have a green or hue effect.
I would recommend replacing the monitor if the back lights are going bad. Chances are that it's not the back light that is the problem. It's like replacing a light bulb on a bad circuit. If you replace the bulb it will work for a while, but it will probably go bad again. I would simply invest in a Viewsonic monitor. You will get a better quality product as well as a better warranty.
Don't worry, and not be taken aback by a virus. It is a problem which I am myself facing, it is a problem seen in rainy season in which the curcuits of the monitor get rust and pads get pressed. Replace it by new components. Heating the monitor ( by bulb being hanged aside ) may solve the problem.
I fix a lot of viewsonics and there is no diagrams available to the public as far as I know.
It could be your power board or inverter just needs rebuilding.
It may be a bulb, but usually the boards fail first
Chances are it's not the actual CFL back-light bulbs themselves, but the back-light inverter board.
If it was the bulbs you would have not had the "warm up and it get bright" issue.
The board IS replaceable, (as well as the bulbs) ViewSonic charges about $36.00 USD for the board when they have them in stock. (out of stock as of yesterday 11/14/2006)
It should be covered under warranty if you got longer than one year. (I know the warranty was only one year on MY VA800 but I have seen longer offered since i got mine)
Good Luck I hope this helps!