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Posted by Rick Merrill on 02/01/07 19:48
Jan Panteltje wrote:
> On a sunny day (Thu, 01 Feb 2007 11:13:58 -0500) it happened Rick Merrill
> <rick0.merrill@NOSPAM.gmail.com> wrote in
> <z_ydna_ZG_dbjF_YnZ2dnUVZ_tudnZ2d@comcast.com>:
>
>> Jan Panteltje wrote:
>>> On a sunny day (Wed, 31 Jan 2007 10:02:46 -0500) it happened Rick Merrill
>>> <rick0.merrill@NOSPAM.gmail.com> wrote in
>>> <sq-dnRM_vOwAMl3YnZ2dnUVZ_sSdnZ2d@comcast.com>:
>>>
>>>> LCDs also use less power AND they do not have to use power even while
>>>> they are OFF -
>>> LCD on standby uses as much power as anything else..
>> LCD display if the computer is on sleep/hibernate/standby uses as much
>> power, BUT an LCD display whose power is "Off" at the switch, does nOT
>> use as much power as a CRT that's plugged in but in "off" mode. Are we
>> speaking the same terms?-)
>
> OK, what I mean is this:
> There is some electronics in the monitor (or TV) that is powered when the switch is 'off'.
> (Unless you have an ancient one with a mechanical switch).
> In case of the TV (be it LCD or CRT) it will look for IR remote control commands, so
> the IR receiver is always on.
> In a typical CRT there may be a 'standby quick picture' mode, or whatever they call it,
> where the heaters are also a bit pre-heated, so you have a picture in a second or so,.
> A typical standby mode for a TV or printer consumes anything from 2 W to 10 W.
> A pre-heated heater will maybe add 1 or 2 watts (would have to look it up), so in general
> makes little difference if CRT or LCD.
>
> I am not sure, but is there in the US a requirement for a real mains switch too?
> My monitor does not have one, my printer does not have one....
> My PC has one ( I am in Europe).
> So if not, then it is safe to assume some electronics is always on, looking for a switch
> press, or some remote control signal.
>
UL requirements (Underwriters Labs) have moved most new US electronics
to (just as you suspected) Not have a real mains switch, but instead an
electronic button that triggers a relay... UL regs also have moved all
low wattage devices to have a "wall wart" (separate power supply) and of
course those things draw some power all the time.
I guess I had a hopeful fantasy that moving 30m people to LCD screens
would save energy consumption/waste. :-(
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