Macbook Display Not Working (Black screen)

I have a Macbook 13.3" and I recently sent my screen in to get fixed after I dropped it. The hardware is fine, but I tried to turn on the computer and everything's working fine, but the screen won't turn on.
I can hear sound, I have tried using the screen light (increase and decrease), and the screen itself does light up a bit, but not enough to even consider it on; it looks black, regardless, just a lighter tone of it.
This leads me to believe that something is wrong with the signaling, since it is obvious that my screen's inverter is providing the screen power.
What is wrong?

why not just take it back to whoever "fixed" it and get them to fix it for real, NO LEMONS!

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