I'm also wondering whether V1.1 is compatible with older versions. Still no one tried? I get asked very often to repair Surface Pro 3 with broken screen and I always refuse them, but perhaps needlessly?
There are a few steps you can take: 1) TCP/IP reset, see here: http://www.thewindowsclub.com/reset-tcp-ip-internet-protocol 2) In case nr. 1 doesn't solve your problem: reinstall Windows 3) if a clean install doesn't solve the problem, you have malfunctioning hardware. In that case: replace wifi card (should be cheap and easy).
Have you unplugged the lcd while it was displaying? In that case you might have damaged your motherboard. The iPad Mini is in many ways a very delicate device. Working on mini's, always power down, unplug battery and only then unplug lcd and digi. It is common with iPads that you have to soft reset to get the back light working after repair. If that doesn't solve your problem, try changing the lcd. If that doesn't fix it, you damaged your mobo, probably because of disconnecting the lcd with image still displaying, or ipad still powered on. It's possible to fix this, but you'll need to find a place that has an IR-solder station to replace IC's on the motherboard.