The manual is pretty clear about it, too: 'use the power on/off switch on the device, or the power on/off button on the remote control, to switch to stand-by mode'. And in the small print it recommends, that if you go on holiday, you do not forget to disconnect the power lead and the aerial cable, to save energy (and protect against possible fire hazards, although it doesn't say that of course) and switch it off completely.
WTF? I've got to unplug it every night if I want to be sure it's off? What's wrong with an old-fashioned on/off button that actually, you know, switches things on or off depending on your need?