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The problem can be in the inverter board, look for open fuse, or worst will be bad lamp/lamps. You need to open it up and report back what you see so we can guide you furhter: see what bad lamps look like: http://s807.photobucket.com/home/budm/allalbums
These have age related problems on the inverter board which lights the 4 bulbs I repair these regularly through ebay. Most common cause is a blown fuse on the inverter board, sometimes that is caused by bad capacitors or transistors. Usually it's just from age and heat. Fuses are marked F1 and F2 and located on each side of the white large plug that feeds the board. These can be checked with continuity meter. Fran
The fuse on the inverter is very small usually small that a grain of rice. It will be labeled F something such as F101 F205 etc. The other thing to look for is blown capacitors, they are anywhere from 1/4 to 1/2 inch in diameter and 1/2 to 1 inch in height. When they blown the top that is normally fat will either have a domed top or the top will be fully popped open. If you see anything that looks like that then they will need to be replaced before you replace the fuse or it will just blow again. The values on the capacitors are marked on the plastic sleeve that is around them. You may be able get them from Radio Shack but most likely you will have to order them to get the right values. If you have additional questions just email me. I am in the process of posting some pictures of bad capacitors on my web site at www.ccl-la.com/badcaps.html
Buddy Corporate Computer Over 21 years of computer and printer support and repair
just replacing the fuse should help. There are two of them on the inverter board. depending on which one is blown will give you 2 different issues. One will cause the screen to flash content perfectly for two seconds and then drop out. the other will be really dark if can see any picture at all,
Here is a pic of the fuses on the inverter board for a Viewsonic vx900, you can visually inspect them as well if you do not have a volt meter. While visual inspection is not 100% reliable, usually when these are popped you will see the red line across them is black or broken.