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Does your TV heat your face or warm your room?

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Posted by Chuck Olson on August 20, 2008, 4:35 pm
One of the features of the most recently developed flat panel TVs is the
rather large amount of electrical power they demand. Some of it goes to
produce the gorgeous picture you crave, but most of it is either radiated
out the front, convected out the top or blown out the back.

For instance a very popular LCD flat panel pulls almost 300 watts, and if
you want to go to a large screen LCD, you should be prepared to enjoy over
500 watts of comfy cozy warmth. Some of the Plasma panels approaching 60"
pull over 700 watts. Plasma is particularly hoggish compared size to size
against LCD.

If you are thinking of replacing a 5-year-old big screen, or moving up in
screen size to something where you can sit back and enjoy the superb detail,
and want to keep your power demand down around 120 watts, you might just
look into LCD DLP. Your air conditioner and particularly your wallet will
thank you.

Posted by Chuck Olson on August 20, 2008, 4:47 pm

Oops, I meant LED DLP.

Posted by Eeyore on August 20, 2008, 6:03 pm

Chuck Olson wrote:

I believe the most efficient LCD large screen TVs are made by Philips.


Posted by Calvin on August 21, 2008, 3:59 am
 Hi all,

Much of the HYPE (and that is what it is) on this issue is based on
obsolete and distorted information. The problem primarily arises because
journalists of today are BONE LAZY and will gladly regurgitate anything
they are spoon-fed - be it fact, fiction or otherwise !

Modern DECENT flat panels displays have quite reasonable efficiency as
opposed to their CRT cousins of the past. As an example: the Panasonic
50" (129cm) unit I have here (9th generation - since superseded) has a
MAXIMUM consumption of 385 watts at which point the brightness limiter
circuitry operates to control consumption (check the service manual if
you don't believe me: the spec is 385 +/- 2 Watts as the trip point)

Under normal viewing conditions the consumption is more like 250 watts.
Compare that with the approximately 180 Watts that it's predecessor here
used. (a 78cm CRT display)

Considering the display area has more than DOUBLED I think the power
consumption of the plasma display is not unreasonable. The amount of
heat generated is barely perceptible - the panel itself runs cold, and
the air exhausted from the rear (3 x 5" muffin fans turning VERY slowly
to keep them quiet) is slightly warm as opposed to ambient temperature.
Most of this warmth is generated by the large switching supplies and the
display drive circuitry.

Certainly some of the early generation display systems (and to a degree
still the case for CHEAP poorly designed units now) had SHOCKINGLY poor
efficiency and ran HOT !

Most of this is old news that is constantly peddled by the commercial
media in a desperate attempt to make themselves still seem relevant. The
wise people of the world have woken up to the fact that you normally
can't believe a word that the commercial mainstream media utter !


Posted by Mauried on August 21, 2008, 5:50 am

Its just media hype.
The largest power consumers in most households are heaters and hot
water, but you wont see the media criticising house heating
Many people still use resistive element electric heaters and resistive
element hot water heaters which are about the worst way known to heat
your house and provide hot water, but no media crtitiscism here.
Instead we are told we have to buy CFLs and not buy Plasma TV sets.
Tolal loonyness.
If using less electricity in order to curb CO2 emissions was really an
issue, the logical solution would be to ration electricity, much in
the same way that water gets rationed when we want people to use less.

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