Have you checked yours with the multimeter? Edit: (sorry, missed your post saying you had), below still stands though.
The Sony one almost certainly a different plug, but you really need to find out why your laptop appears to have blown up 2 chargers, or it’ll probably instantly blow up a 3rd.
If you don’t know what you’re doing (and I freely admit I don’t know what to suggest, that’s a very odd problem) may I politely suggest you give it to someone who does, better than throwing money at chargers.