Often these get damaged from getting the system wet so if you remember sitting your system down on a wet surface or having something spilled on it that could be what did you in here. There is also a fuse link that can pop as well. OK, so here's the deal there is a chip on the logic board which converts the batteries (DC) power to the correct voltage the backlight LED's require. Just to be sure we're on the right track here So if your external display is working and the flashlight test also lets you see your desktop you've isolated the problem down to the backlight circuit. To check the display, connect your system to an external monitor to see if you can see your desktop image on the external display, next take a flashlight and holding it on the screen of your system at an angle see if you can see the faint outlines of your desktop icons.
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