Hi,
Here’s the [https://downloads.dell.com/manuals/all-products/esuprt_laptop/esuprt_vostro_notebook/vostro-5560_owner%27s%20manual_en-us.pdf|owner manual] for the laptop.
Go to p.20 to view the necessary pre-requisite steps and then the procedure to remove the systemboard.
The systemboard has to be removed so that the [https://www.ebay.com/itm/202622198554|DC-In jack] (suppler example only) can be removed/replaced as it is soldered to the motherboard and not just plugged in.
If doing this yourself seems too daunting, contact a reputable, professional laptop repair service and ask for a quote.