Digging around behind the tv and it's a oversize plug and thin wire rather than a laptop style plug-cable-transformer-cable-computer set up. Not quite the mains-to-box set up you're after.

:)

Getting further off topic, the only other piece of hardware I know of where they bother is the Playstation. The XBoxes use ugly power bricks, just like the Wintel boxes.

The Xbox One S has an integrated power supply fortunately