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> I would expect turning those off and leaving the TV on would use almost no power

That is going to vary a lot depending on the TV. I suspect a lot of modern "smart" TVs consume a measurable amount when idle.

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Idle or in standby? EU regulations state the maximum standby power is 0.5w.

You do, however, typically need to set “low power standby” or whatever in the options somewhere - it’s usually not enabled by default - the default is usually to turn the screen off but leave everything else running. Mine drew about 5W in “normal” standby, and is immeasurably low (from our household inverters - I live off grid) in low power standby. It takes about 10 seconds to boot - no big deal.

> You do, however, typically need to set “low power standby” or whatever in the options somewhere - it’s usually not enabled by default

i had the opposite, i had to disable the low power standby (which was on by default) so i could wake it over the ethernet or via HDMI-CEC

I believe the low power mode is required (by UK law, at least) to be enabled by default. It's pointless otherwise as almost nobody will go and enable that mode.

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