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I hear Plasma TVs are power hogs

Discussion in 'Electronic Repair' started by [email protected], Jan 29, 2008.

  1. Guest

    I was told that these plasma TV sets are extreme power hogs, using as
    much power as refrigerators or air conditioners. Is this true?
    I also heard that LCD tv's tend to lose their sharpness or fade after
    a few years. Is any of this true?

    I dont plan to buy any of them, but I like to know stuff like this.
     
  2. I don't know if they're "hogs", but they do pull quite a bit of power. I
    believe it's in the 400W range, rather more than an LCD.
     
  3. Guest

    A LCD tv will draw a constant 250W of power
    A plasma tv will draw a variable amount of power up to 300W depending
    on scene brightness
    So a Plasma tv will average out very close to the power consumption of
    an LCD tv
     
  4. N Cook

    N Cook Guest

    A couple of years ago I was getting annoyed by others saying how great these
    new geewizz TVs were.
    I put a wattmeter on my old 27 inch CRT one and below normal brightness was
    75W and above normal brightness , 85W
     
  5. Guest

    About two something months ago, I read somewhere that UK is thinking
    about outlawing ''power hogs'' tv sets.I bought a new ''power hog'' RCA
    CRT 27 inch screen tv set on October 15,1999, the same day I bought my
    Philips Magnavox WebTV set top box to hook up to that RCA tv set.Last
    February, I bought a new Sony Trinitron Wega CRT 27 inch flat screen
    ''power hog'' tv set for watching old, old movies.(DirecTV) Less than
    five years ago, I bought a new Velocity Micro ProMagix desk top computer
    and a Multisynch ''power hog'' CRT 22 inch screen computer monitor from
    Tiger Direct.This State of confusion I live in is working on getting a
    new Nuclear Reactor built for Grand Gulf.There are no worries about
    electricity around here, except when storms and tornados and hurricanes
    knock out the electric power.I love Power Hogs. cuhulin
     
  6. hr(bob)

    hr(bob) Guest

    I wonder how accurate the wattmeter was, since the power factor of
    tv's tends to be rather poor due to the switching power supply. Here
    in the USA there are no requirements on the power supply power factors
    like there are in the EU. Was the wattmeter a true meter like the
    power company puts on the side of your house?

    H. R.(Bob) Hofmann
     
  7. James Sweet

    James Sweet Guest


    I wonder how much a 27" plasma set would draw, if they made such a thing?

    My 56" projection set is rated 300W, seems like I measured it and it was
    closer to 200W in actual use. My refrigerator draws around 140W, small air
    conditioners are closer to 1KW. If curious, spend 20 bucks on a Kill A Watt
    and measure the stuff yourself. It's quite a sophisticated instrument for
    the price, I was impressed.
     
  8. James Sweet

    James Sweet Guest

    A LCD tv will draw a constant 250W of power

    Based on?

    The size of the set, the brightness settings, and in the case of LCD, the
    backlight technology all have an effect on power. I read recently of a large
    LCD set with LED backlighting that draws an average of 88W.
     
  9. James Sweet

    James Sweet Guest

    I wonder how accurate the wattmeter was, since the power factor of
    A low power factor will cause the reading to be high anyway. 78W is not
    unreasonable for a 27" set. I measured a 22" CRT computer monitor with a
    real wattmeter and found it to draw around 100W, and it's substantially more
    complex than a TV.
     
  10. N Cook

    N Cook Guest

    onhttp://home.graffiti.net/diverse:graffiti.net/

    I wonder how accurate the wattmeter was, since the power factor of
    tv's tends to be rather poor due to the switching power supply. Here
    in the USA there are no requirements on the power supply power factors
    like there are in the EU. Was the wattmeter a true meter like the
    power company puts on the side of your house?

    H. R.(Bob) Hofmann

    My wattmeter is a coin slot meter with the coin mechanism bypassed, no fancy
    LCD displays and LSI.
    ie mesures whatever I am charged for, cross calibrated by agreeing with my
    normal utility co meter for the same load down to the disc rotating very
    slowly and up to 1Kw.
     
  11. James Sweet

    James Sweet Guest


    Coin slot wattmeter? What's the intended purpose? I've never heard of such a
    thing.


    A useful tidbit I learned relatively recently, UK electric meters record
    apparent power, or so I'm told, while US meters record true power. The
    effect is that power factor correction saves the UK consumer money, while in
    the US there's no direct incentive for the consumer.
     
  12. Guest

    I'm surprised to learn that a LCD tv draws that much, considering how
    many LCD devices operate on batteries. Even if the battery ones are
    much smaller (cellphones, calculators, portable dvd players, etc) I
    still would have expected a LCD tv to draw less than a CRT tv. It
    does than appear that a plasma is not all that much more, although
    still the highest.

    It than looks like for energy savings the CRT is still the best deal.
    This is surprising, at a time when energy saving is a top priotity,
    and there is even some govt. plans to eliminate incandescent light
    bulbs in the US in the future and make everyone use the compact
    florescents (which would really suck, because CF bulbs do not work
    well in cold weather an other situations).
     
  13. James Sweet

    James Sweet Guest


    LCD sets do typically use less power for a given size than CRT. The other
    poster is simply not correct.

    CFLs work fine in cold weather, I have some outdoors that I've used down to
    20F and while they took a bit longer to warm up, they did reach full output.
    There are applications where incandescent is still better, but the cold
    weather doesn't really matter. Metal halide is another viable alternative
    for cold weather use.

    Some halogen lamps meet the energy requirements, the law doesn't say the
    source has to be fluorescent, only that it has to meet certain efficiency
    requirements.
     
  14. msg

    msg Guest

    For comparisons, my Polaroid LCD-2000 20 inch TV draws 62W max. at 12VDC;
    I think that this is better than most 20 inch CRT TVs.

    Michael
     
  15. UCLAN

    UCLAN Guest

    42" Plasma TV (Sony FWD-42PX2S): rated at 350w
    46" LCD TV (Sony KDL-46S3000): rated at 215w
    34" CRT TV (Sony WEGA KD-34XBR970): rated at 240w

    So, Plasma is a tad bit more than tube. LCD is much less than either.

    If you have two or three 100w light bulbs left on in unused rooms, it's
    about the same thing. "Power hogs" ?? I don't think so.
     
  16. msg

    msg Guest

    James Sweet wrote:

    Try using 'em in No. MN at -25F; you will gladly return to incandescents.

    Michael
     
  17. You were misinformed:
    UK domestic meters record true energy!
    Martin(Stockport)
     
  18. Guest

    Many years ago in America, people had to put some coins in a coin slot
    box if they wanted to keep their electric power turned on.When electric
    power was first being supplied to many towns and homes in America, the
    electric power companies only supplied electric power to homes for a few
    hours each evening.
    cuhulin
     
  19. I've got no expirence from MN, but someone put a CFL in our walk in freezer
    at work. You could leave it on for hours and it wouldn't get up to full
    brightness. The frezer was kept at -40F.

    Mike
     
  20. James Sweet

    James Sweet Guest

    "


    That's obviously much colder than it ever gets here. Was it an enclosed CFL
    or one with exposed tube? That makes a big difference.

    Metal halide is a better choice for very cold temps. Halogen is also an
    option, not a lot more efficient than standard incandescent, but enough to
    meet requirements.
     
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