Normally network or Signal problems in Nokia Lumia 510 or any other mobile phone are caused by damaged antenna. If the antenna is in good shape then the connection points may be disturbed, also sometimes turning off 3G helps too.
The signal problem in mobile phones can occur because of many other reasons like if the mobile phone is water damaged it can get rusty which in turn can damage any number of mobile phone parts. Any way if the antenna points are damaged I have marked their full jumper ways in the diagram below.
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Here are Nokia Lumia 510 antenna ways and Network problem solutions. Please study these diagrams very carefully before you start repairing.
Left antenna point which is marked with black line is just ground, right antenna point marked with red jumper line firstly connects to the top of L3202 & C3210, then it starts up again from the other side of C3210. From the bottom of C3210 it connects to the top of L3203 and the bottom of L3204, then it start up again from the top of L3204 and connects to the bottom of C3207 and the second leg of the external antenna connector. It moves on you can see full ways in the diagram.
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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.