On 09/12/2015 10:19, The Natural Philosopher wrote:
On 09/12/15 10:13, Martin Brown wrote:
On 09/12/2015 09:51, wrote:

Can anyone give actual answers (and no more) to the actual question?

No. The question as posed is impossible to answer since it depends
critically on the exact model of PSU in the generic PC and potentially
on certain BIOS settings (ie keeping the memory active in suspend mode).

Likewise the model number and version could be used to find the LCD
display manufacturers claimed power consumption in standby.

The only way to find out for sure is to *measure* it on the actual kit.

And in fact measuring very very low duty cycle current into very low
power switched mode PSUs, is in itself a highly suspect enterprise.

Indeed although it will probably give a good indication if the thing is
drawing an outrageous standby power. Some older TVs are ~20W by default.
This makes a standby powersaving switcher (~£4) worthwhile.

Most well designed kit these days is well under 0.5W on standby.

(The modern tendency is to have two switched mode PSUS - one that runs
the 'standby' power unit, and which switches on the main switched mode
PSU when the start button is pressed).

Cheap and nasty ones tend to be around 4W continuous and some of the PC
sound boxes are not actually powered off even when switched off!

--
Regards,
Martin Brown