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TV Electricity Usage |
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#1 |
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TV Electricity Usage
Does watching TV in HD use more power than standard viewing?
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#2 |
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No - using a larger TV to get the benefits of HD will though.
When you watch a SD programme on a HD TV the screen has the same number of pixels as when watching a HD one. The extra ones are invented by the TV by it's internal scaler. |
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#3 |
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Probably depends on the age of technology.
Some of the first HD Freeview boxes used a high 30 watts in HD mode ! Decent silicon chips should now mean little difference. |
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#4 |
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Quote:
Probably depends on the age of technology.
Some of the first HD Freeview boxes used a high 30 watts in HD mode ! Decent silicon chips should now mean little difference. |
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#5 |
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Thanks for the replies.
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#6 |
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Quote:
An HD chip will still require more power than an SD only one, it's the nature of the beast.
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#7 |
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relative to the power consumption of even a LED TV, I am guessing that the power usage of HD vs SD by the decoder chip is negligible.
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#8 |
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The same number of pixels are being worked regardless
Sd image has to be upscaled to fit, HD processing/decode is trivial at this point...I mean really, even ipad type things do HD now.
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#9 |
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Quote:
The same number of pixels are being worked regardless
Sd image has to be upscaled to fit, HD processing/decode is trivial at this point...I mean really, even ipad type things do HD now.As far as that goes, higher spec sets take more power for the same reasons, better and faster processing (faster in terms of the chip speed, not actual 'real' speed). |
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#10 |
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My post was in response to a comment about a Freeview box, not the TV - but an extra few watts isn't really 'negligible' in the low consumption of a modern LCD TV.
http://reviews.cnet.com/green-tech/t...umption-chart/ In terms of annual running cost 1w approximately = £1 assuming the device is on 24x7. |
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#11 |
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I would imagine that when the IC is outputting an SD image it won't be drawing as much current to do the computation.
I do agree that this saving in power would be rather marginal as these ICs are extremely efficient. |
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#12 |
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![]() Pretty horrific Plasma values ![]() If the Freeview HD chip takes an extra 5W, that's a pretty high percentage of a modern LCD/LED set. |
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#13 |
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That's a VERY old list
![]() Pretty horrific Plasma values ![]() If the Freeview HD chip takes an extra 5W, that's a pretty high percentage of a modern LCD/LED set. ![]() An extra 5W is around 10% of the total consumption of many LCD's it should be very easy to check simply watch BBC1 and check and then BBC1-HD and check. An extra 5W for 1 chip sounds far fetched to me. How much extra current does the scaler circuitry require to upscale 576i to 1080i. |
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#14 |
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That takes some swallowing
![]() An extra 5W is around 10% of the total consumption of many LCD's it should be very easy to check simply watch BBC1 and check and then BBC1-HD and check. ![]() Quote:
An extra 5W for 1 chip sounds far fetched to me. I suggest you don't find out what the processor you're using in your computer consumes ![]() Quote:
How much extra current does the scaler circuitry require to upscale 576i to 1080i. |
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#15 |
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No idea, but no extra, because again the chip is running all the time.
If a scaler IC is designed to be able to handle upscaling of 1080 then when producing less than that it will be under less load. Just check a PCs output when you connect a higher res display. |
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#16 |
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And has nothing to do with Freeview HD - where the chip set is far more power hungry than an SD only chip set, more memory, faster clock speed etc.
As far as that goes, higher spec sets take more power for the same reasons, better and faster processing (faster in terms of the chip speed, not actual 'real' speed). ![]() If it were that power hungry it would require some insane heat sinking, heat is heat, if the chip used 50 watts it would be like cooling off a 50 watt light bulb with a heatsink and fan, no simple task, let alone in the size constraints where it would be. The numbers for such chips is trivial, else there would be a scandal. Since the things are built into tv's now, the power has to be trivial else it would require some elaborate and expensive cooling since there is no space at all inside a tv now. |
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#17 |
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How would that help?, the chip is still inside the TV and still running
![]() Based on the relative consumptions of HD and SD Freeview boxes I thought 5W seemed a reasonable figure?. These massive complicated chips run at very high speeds, and consume considerable power. I suggest you don't find out what the processor you're using in your computer consumes ![]() No idea, but no extra, because again the chip is running all the time. ![]() From the Sony Website Sony KDL-40EX503 (DVB-T2 HD Tuner) Home mode energy consumption 106W Sony KDL-40CX520 (DVB-T SD Tuner) Home mode energy consumption 120W (it actually says 181W but they have mixed up shop mode and home mode) |
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#18 |
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Quote:
I imagine the OP was asking does it use more electricity to watch HD than SD on the same HD capable TV. Which bit is not being used
![]() Quote:
From the Sony Website Sony KDL-40EX503 (DVB-T2 HD Tuner) Home mode energy consumption 106W Sony KDL-40CX520 (DVB-T SD Tuner) Home mode energy consumption 120W (it actually says 181W but they have mixed up shop mode and home mode)
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#19 |
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Yea well how much does the freeview chip use?
![]() If it were that power hungry it would require some insane heat sinking, heat is heat, if the chip used 50 watts it would be like cooling off a 50 watt light bulb with a heatsink and fan, no simple task, let alone in the size constraints where it would be. As you say, heat is heat, and chips often get HOT! - too hot to touch isn't unusual. |
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#20 |
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This is why the chip in an HD box often has a heatsink attached, where SD ones don't.
As you say, heat is heat, and chips often get HOT! - too hot to touch isn't unusual. Its not quite the same, but similar enough for the principle. If say a 2-3 watt chip is in a totally confined environment of a tv, yes, you'd heatsink even that, but it would still be trivial power use. The most obvious reason the chips doesn't use a lot of power is that if they did, it would create an engineering nightmare for tv designers.
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#21 |
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I wouldn't have thought so, the chip 'may' use slightly less power for SD than HD, but I doubt it's much. On the same grounds, the scaler 'might' be using more power upscaling the SD though as well?.
So why compare an LED set and a CCFL one? ![]() ![]() http://www.sony.co.uk/product/tv-102...TechnicalSpecs http://www.sony.co.uk/product/tv-102...TechnicalSpecs |
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#22 |
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And has nothing to do with Freeview HD - where the chip set is far more power hungry than an SD only chip set, more memory, faster clock speed etc.
As far as that goes, higher spec sets take more power for the same reasons, better and faster processing (faster in terms of the chip speed, not actual 'real' speed).
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#23 |
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Sorry, I thought the EX were LED?, while the CX (bottom of the range cheap set) was CCFL.
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#24 |
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These are trivial things now and have been for a long time
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#25 |
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Quote:
Freeview HD hasn't been round 'a long time'
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Sd image has to be upscaled to fit, HD processing/decode is trivial at this point...I mean really, even ipad type things do HD now.


