iPod Touch 4g LCD connector problems

I had a cracked screen in my iPod so I took it to a service. They changed the screen and it was OK, until I tried to connect to my home wi-fi network. Before screen replacement I could access wi-fi without problems from my room (about 25 meters from router) and after the replacement, I had problems with connection even while standing about 15 meters from router (in the corridor). I read that should an antenna problem, so what I should to do is to open iPod and push the antenna badge down. I opened it, done what was said and "closed" iPod. But I saw the lcd connector wasn't connected to the pinned gap. I couldn't get him into the gap again. I plugged ot to the computer to get known that my iPod is in soft DFU mode. LCD is not responding :(