@Butters,

All that is great but not trying what I have pointed out be for going down the road of so called repairing the USB port.

You pointed out:

I quote you:

"A common mistake is using a generic socket to replace a damaged Garmin socket. They're usually different and it's hard to find a suitable match from electronic parts suppliers. If a socket has broken pins internally i now only use scavenged sockets from devices with bricked boards, they are at least a guaranteed fit."

That alone said do not try it.

I have 25 Garmin units dated back as far as 2007 and they all work.
Have never used and generic cables or charger on any of the GPS units.

Been using only genuine Garmin cables and chargers both for car and house.
To many times users do not watch how the plug cables into their USB ports and make a problem for themselves.

This unit being second hand to start with we do not know how well it was taken care of in the first place.

Some times a little TLC on the unit will do a world of good...... to bring life into the unit again.