In Nokia Lumia 520 network problem is mostly likely caused by the disconnected antenna. If the antenna has a bad connection to the mobile phone’s motherboard it can stop your mobile from getting any signal at all.
Bad connection between antenna and Nokia Lumia 520 motherboard can happen because of a number of reasons. Most likely something like this happens if your mobile phone is dropped or mishandled in any other way.
There are three antenna connector springs on the back side of the motherboard and I have all of their jumper ways in this diagram. Make those jumpers if your mobile phone’s antenna is in working condition but still not getting any signals, hopefully your problem will be solved.
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Here are Nokia Lumia 520 network antenna jumper ways. Please study these diagrams very carefully before you start repairing.
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Note: Every repairing solution posted here is tested by at least one member of our team. Use the information available here at Your Own Risk. We are not responsible if any harm comes to your device during the repairing process.