Is this a repairable LED issue or a bad LCD panel? (see picture)

The TV is a Samsung UN75MU630DFXA, although I replaced the mainboard with one from UN75MU6300FXA and it has worked fine for 3 months. But the TV was moved, and now it looks like the image below. It’s normal on the right. I’m wondering if it could even just be a disconnected cable, but my first thoughts are that it can’t be fixed without a new panel. In which case, at least it’s almost Black Friday.

It’s not obvious in the pictures, but the dimmable squares are all clearly visible.