IBook G4 Backlight won't light

Hiya -
Got a bit of a problem with my iBook.
For a little while now, it's been having a now and then, intermittent problem where the backlight wouldn't come on, and to be honest, it's been a while since it happened, so I don't recall the particulars of what seemed to cause it., but putting it to sleep then waking it seemed to solve it.
Thing is, the other day, I accidentally dropped it while closed, it landed on the display case side, and now the backlight doesn't come on at all. I know it isn't that there's nothing on the screen - can see what's on it with the room lights bright or with a flashlight - so it's not a sleep problem. In fact, close the screen and the sleep light still comes on.
Anyway, I am fairly technically adept, provided I've got instructions, so I was wondering what the probable causes might be. Loose cable connection? broken backlight bulb? Other? I'd like to repair it, and locate a manual if I can.
I know, it's a bit old - 5 years - but if buying a new one was the easiest option I'd have done it already, so not to be snarky, but please don't say "Dude, it's old, just get a new one." I see people saying that all the time to others, it never helps. Unless there's no other way that won't cost almost as much, I'd like repair advice.
Anyway, thanks - Hope someone can help me keep my iBook going a bit longer.

Brett,
Turns out it's a logic board thing, not the inverter
Uhh who gave you that diagnosis given:
I know it isn't that there's nothing on the screen - can see what's on it with the room lights bright or with a flashlight - so it's not a sleep problem.
So actually the logic board is working fine. It's possibly the reed switch but they usually fail in the open position or that fuse is gone on the logic board or the cable is open/shorted. Did you check that out?
I've decided to mod it and get a MacBook instead.
Which wouldn't work if the logic board was toast which I don't think is the case.
Have you run an external monitor?
I asked about this elsewhere, and was told you'd be the guy to ask about this plan
Yah email me (click on "spudnuty"). If you're tossing the extra parts I could use them in my donation efforts.
Richard
Basically, I'm planning to put it in the shell of a Mac SE.
iBook 1.2 GHz G4 Mac OS X (10.4.11)
Is it a 14" or 12"? I use a 14 every day and walk into my office if I want to watch a streaming video (iMac G5).
I'd like to be able to hook it up to the internal screen connector (long shot, yeah, but who knows).
Yah that video cable (LVDS in AppleSpeak) is totally different people have been trying to crack that for years. There was a guy in Green Bay a few years ago. Forget how that came out.
Otherwise, the external VGA video output adapter (and if that's the case, is there some way to get it to mirror to an external larger screen?) would have to do.

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