[SOLVED] Display backlight failure after hinge replacement

I just replaced the hinges on my 11th gen (I think) framework. Immediately before the hinge replacement, the display worked. After replacing the hinge, the display backlight seems to have failed: under a bright light I can just barely see the login screen (and log in, etc.), but I can’t see anything without the bright external light.

My guess is either

  • I failed to plug in something I should have, or
  • I damaged some cable

but I don’t immediately see anything.

What should I be looking for?

Repeatedly unplugging & replugging the display cable fixed this. (Some weird symptoms before it got fixed, though.)