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Heres the solution tp repair Nokia 7510 supernova Charging problem issues. This solution shows the location of the spare components that might get damaged if the device does not respond when a charger is plug-in.

From the charging pin terminal the charger positive voltage is feeds across to a chip fuse, if the chip fuse is damaged or busted the battery charger voltage cant get through to the circuit,
make a continuity check on the fuse by using a multimeter, replace it if found damaged.
Check the chip diode if shorted or not, a shorted diode will make the fuse blown out again.
If the chip fuse and chip fuse is working fine and found out that theres no problem on both  it, you may proceed to work on the betty IC,
The betty IC holds and control the charging operation of the cell phone battery.
Re-flow and apply a mild heat first on the betty IC, then check again if the problem was solved.
If the problem still exists, remove the betty IC, trace the corresponding solder ball bumps that is connected to the filter coil (power inductor). If found cut or open and you can manage to apply a jumper wire, then do it, if wont not just leave it and return it to the owner..
If the said line paths is okay you may re-ball the betty IC then in-place and mount it back again.
If the problem still persists, you may then find a new replacement spare betty IC and replace it.

iPhone Check Warranty Unlock

iPhone iPad Check Warranty unlock function allows to check which network is the iPhone and check simlock status. This information is needed to order unlock service. Checking is done on the basis of the IMEI number. Information comes directly from Apple base.