So we just bought a bunch of replacement 3D glasses for the TV we got on craigslist. I followed all the instructions I could find, which all pretty much said the same thing:
Turn the TV on.
Start playing something 3D or turn the 3D mode on.
Press the Power button on the glasses, and wait for them to connect.
Well, that wasn’t working for me. After about an hour of research, I came across the solution! You have to unplug the television from the wall for at least 40 seconds (wait for the red TV power light to go off in the front), and plug the TV back in and retry the above procedure.
Apparently this resets the bluetooth(?) receiver in the TV. Good luck!