Black macbook backlight display issue

im working on a friends macbook. the issue is the display. the laptop boots up just fine but after laptop has powered up the screen stays dark. the battery is charged. when the "f2" is tapped once the display lights up a little. when pressed again it goes back to dim. i then have to press the "f1" key to bring down to the lowest setting. i do this all over again some times i can get to around the 3rd brightness setting then it automatically drops to dim. i assume the backlight bulb itself is ok so am i right in saying the inverter is going bad or is there something in the "f1" "f2" keys that is not making a good connection. I hope i explained this well enough. Thanks.

Actually, I don't think you can hook up the USB to a RGB cable.
Wich imputs does your projector support? VGA?
If your projector supports VGA imput you can use a displayport cable with VGA exit and plug the projector there.

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