TV Sony kd55xe7005 can't find my router?

A few minutes ago my TV hung up on the netflix and I had to pull the plug. Since then he can't find my (or any) Wi-Fi router. I tried a lot but when I search for wireless networks, only "manual entry" comes which does not work either. I have already restarted the router and the TV too. Any solutions?

You can only do a factory reset at most. I can't think of anything else.