Black Screen BUT Backlight Works and External Display OK

Black screen is persistent (i.e. no pixel data) but I can see the shimmer of the backlight on, just all the pixels are black. I replaced the inverter (661-4112) and it worked again for a couple weeks, now back to the same old black screen.
It seems the backlight burning out is common, but this I have never seen before. If it were the integrated video card broken, you'd think an external monitor wouldn't work, but it does.
Any ideas ladies and gentlemen?

This is a shot in the dark. Try a SMC and Pram resets:
http://support.apple.com/kb/HT3964
http://support.apple.com/kb/HT1379
If there is not a cure, the a trip to a repair facility is in order.
Ciao.

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If the unit has NEVER been jailbroke, first try a system reset. It cures many ills and it's quick, easy and harmless... Hold down the on/off switch and the Home button simultaneously until you see the Apple logo. Ignore the "Slide to power off" text if it appears. You will not lose any apps, data, music, movies, settings, etc.
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iTunes free download from www.itunes.com/download
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Black Screen BUT Backlight Works and External Display OK

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