Hi
You have to Strip the laptop completely, remove the motherboard, desolder the old charging socket and replace with an IDENTICAL one (from a reputable laptop parts supplier). it MUST be identical, down to the last figure of the part number..
Then after re-soldering the new one you replace the motherboard and hope you got it right....
If you are not confident of stripping a lappy completely then take it to a Laptop repair shop... but its expensive...
My laptop repair company in the UK as an example charges £109.80 ....that's £9.80 for the socket and 2 hours labour = £100... so not cheap...
All the best Brett