What kind of power connector do Sony VAIO laptops use?
Most Sony Vaio laptops have a 19VDC power supply with a 9.5mm long shaft (OD=6mm ID=4,3mm) with inner pin through the centre which is the positive terminal.

http://pro.sony.com/bbsc/ssr/cat-vaio/cat-vaioaccessories/?navId=4294963397+4294963245&amp;refine=4294967294