Rob Pegoraro's post | Latest updates on Sulia
iPad cracked-screen update: When in doubt, replace the WiFi antenna along with the screen.
When I last wrote about my attempt to get our iPad 2's cracked screen fixed, the screen transplant had left our tablet with drastically reduced WiFi range: http://sulia.com/robpegoraro/f/759e30b5-1e2a-4db1-bf1c-c7e46ae00fd8/
So I took it back to the WiGoClinic repair shop; two days later, its WiFi was back in working order. I called to say thanks and ask what they'd done to fix it. The guy said that although the old WiFi antenna didn't show any sign of damage when they opened up the tablet again, they replaced it with a new part anyway--and that did the trick.
And that, in turn, matches up with reports of inoperative or ineffective WiFi after screen replacements that I'd seen on the iFixit gadget-repair database: http://www.ifixit.com/Answers/View/113355/Wifi+not+working+after+Digitizer+replacement