Display won't turn on after trackpad repairs

Initially the trackpad on this mac wouldn't pop up after being clicked. I used the repair guide for the replacing the trackpad and was able to easily repair it.

After putting everything back in place, I started up the machine. It sounded like everything powered ok, but the display remained dark. When I plug the computer into an external display everything seems to be fine (including the trackpad) but the internal display stays dark.

I have already tried a few things that others have used to fix similar problems including resetting the NRAM and the SMC. I have also taken the mac apart and put it back together again just to make sure I didn't forget to plug in a cable. No dice.

The mac doesn't have a warranty, so my question is, is there anything I can do to A: fix it without buying any parts, or B: fix it by buying an inexpensive part?

Thank you for your help!

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Only you know if you damaged a connector on the logic board... if you did there's little "inexpensive" that can be done.

You could replace the display data cable - that is inexpensive (however that is avery advanced DIY repair). Next comes LED controller, then the screen itself.

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