I just got my iPod touch 4g repaired and now my wifi is down

I just got my iPod touch repaired because i had a cracked screen. I got it back one day ago, and it was being repaired for 3 weeks. Whenever i try to use wifi, no networks show up. I tried rebooting, but nothing happened. I know that the signal bar cant be completely broken because at my friends house i would get wifi for 5 minutes or so. then it would break down again for half an hour. When i got home, no networks showed up. Its been like this until now. Can someone please help me?
Also if i put my ipod right next to the router it works, but when i walk away the signal stops.
And i have an unrepsonsive home button.

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https://discussions.apple.com/thread/5219999?tstart=0

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