What brand and series capacitors did you use for the repair? The capacitors need to be low ESR, high ripple current and high temp. If you used standard caps they could still be the problem. Your power supply board should be a FSP043-2PI01. This board is used in Viewsonic and Hanns-g monitors. Here is a picture with the capacitors circled:
http://www.ccl-la.com/hx191.jpg
Be sure you replaced the small starter cap too, many people overlook that one. If your power supply still does not work then you need to check the transformer for shorts and then check the backlight tubes. To check the tubes it is best to have a spare set to plug in to your board. You can get backlight bulbs to test in the kits that add lights to the insides of systems, they will come in colored tubes like blue, pink or purple. Let me know what you find and we will go from there.
BuddyMc
www.ccl-la.com