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Low power option with HDTV
By Opera House, Section Remote Living Posted on Fri Mar 13, 2009 at 08:25:12 PM MST
Less power than you think

I recently purchased a used 27 inch HDTV which wouldn't turn on. To verify that there were no other power supply problems, I monitored current with a really nice power meter. Manufacturers tag says 200W, but this TV only draws 132W on bright back light, 112W on middle and down to 62W on dark back light. Some may not aware that there is an option to control the back light. This has a really good power supply with power factor control, PF is between 96 and 98%. Surprised at the very low harmonics this introduces on the power line. 62W is not much more than some of my other smaller TVs and more than enough light if you view mostly at night. Peak turn on current was 6.3A and OFF standby wattage was 4W. Worth wile turning off with the main power switch. Hope this is useful in deciding on your next TV purchase.

Low power option with HDTV | 9 comments (9 topical)

Re: Low power option with HDTV (3.00 / 0) (#1)
by richhagen on Fri Mar 13, 2009 at 04:37:29 PM MST

Out of curiosity, what is the make and model of that television? I have a 32" LCD Haier TV which does appear to have a brightness and contrast feature, but I would have to measure the changes in power draw to see what if there was any effect. It gets pretty warm on top of the thin console, like the older crt it replaced. Rich
'A Joule saved is a Joule made'

Re: Low power option with HDTV (3.00 / 0) (#2)
by Opera House on Fri Mar 13, 2009 at 06:13:39 PM MST

This TV is an Astar LTV-2701. You should be able to find a back light control on the same pull up screen as contrast and brightness. Brightness in a LCD tv has no effect on current, even picture options like cinema,user, normal, or high brightness. The back light is an actual lamp which provides lighting to the screen.

Re: Low power option with HDTV (3.00 / 0) (#3)
by PaulJ on Sat Mar 14, 2009 at 04:12:01 AM MST

Our 42" LG brand LCD TV, fairly new, on full backlight uses about 240W, on minimum it's down to 105W.

We run it off-grid no problems, on the minimum setting it's only using 30 to 50% more than the 20" CRT set it replaced.

It's much nicer to look at.

Paul.

[ Parent ]

Re: Low power option with HDTV (3.00 / 0) (#4)
by halfcrazy on Sat Mar 14, 2009 at 05:04:48 AM MST

we found about the same 65 watts with no backlight and 150ish watts with full backlight and to tell you the truth we cant tell the difference?

Re: Low power option with HDTV (3.00 / 0) (#5)
by Opera House on Sat Mar 14, 2009 at 12:49:49 PM MST

I have an older 26 inch CRT TV I just checked and it draws 115W and 12W on off standby. That's more than twice what I thought it was it was drawing while off. I need to go around and see what else is wasting power.

Re: Low power option with HDTV (3.00 / 0) (#6)
by DamonHD on Sat Mar 14, 2009 at 01:45:11 PM MST

My washing machine bizarrely was one of the worst, eating 10W when apparently 'off' at the machine.

But beware that the likes of the Kill-a-Watt can be particularly inaccurate measuring very low power consumption. One of my meters now claims that 3W is being consumed even with nothing plugged in to it!

Rgds

Damon
"Once you have licked the windows of freedom your tongue gets stuck."
[ Parent ]

Sorry topic diversion.. (3.00 / 0) (#7)
by TomW on Sat Mar 14, 2009 at 01:59:40 PM MST

Hehe, can't help but see the pic of your TV show and think:

Dr. Phil? What a poser.

Not even a real doctor.

Sorry.

On topic;

As Damon noted, I don't think my killawatt can deal with low power draw. Just got one from Newegg and been playing with it.

Tom

Re: Sorry topic diversion.. (3.00 / 0) (#8)
by Opera House on Sat Mar 14, 2009 at 03:40:06 PM MST

I guess you haven't bought his new book!

"Twenty Other Ideas I Just Pulled Out Of My A#%"

[ Parent ]

Re: Sorry topic diversion.. (3.00 / 0) (#9)
by DamonHD on Sat Mar 14, 2009 at 03:43:28 PM MST

Hey, that's my job!
"Once you have licked the windows of freedom your tongue gets stuck."
[ Parent ]

Low power option with HDTV | 9 comments (9 topical)

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