Where does the green wire go?

The top screen went dead on my kids' 3Ds. I read online that the wifi card coming loose can cause screen problems, so I opened it up and secured the wifi card. No luck. Then I bought a new top screen, took the DS completely apart, put the new screen in, put it all back together. And now neither screen works.

In the course of putting it together, I had one snag. The green wire that comes out of the wifi card runs along the back of the motherboard, then plugs in somewhere near the hinge. It came loose while I was disassembling, and I couldn't figure out where it came from or where to plug it back in.

So I'm pretty sure that's the cause of my problem, but I can't find a guide online that shows where that green wire is supposed to connect. Or is it even supposed to connect? Does it just run along the back as a wifi antenna? Or does it attach to something I'm not seeing? Please help!