How do I power leds for a lcd ccfl conversion?

I have an 19" LCD monitor that the backlight finally went out on. I'm assuming it's the ccfl since they starting flickering and changing colors months ago but now they are dead. I opened it up and it use (4) 16.1 ccfl tubes. I was thinking of maybe converting it to use LEDs. The thing is that I don't want to use a separate power supply. I'm figuring I will probably need about 40 or more LEDs. How do I find the power I need from the monitor to power 40 or more LEDs? Has anyone had any experience with this sort of thing?

The power supply is usually the culprit in LCD monitors, so you should check that first before going any further. The major components to fail are the capacitors. Inspect them to see if they are bulged, leaking or burnt. I know of many LCD monitors brought back to life just by replacing the caps.

Qa