Power consumption of my Sony and LG LCD TVs

A few months back I ordered and received a “Digital Utility AC Power Consumption Monitor and Timer” from DealExtreme (see my initial post here). I’ve now used it to briefly measure the power consumption of my two home LCD TVs.

Sony KDL40V4000

The KDL40V4000 is an LCD, V-series Bravia full HDTV. On the back plate the rating is “220-240V @ 225W”.

Power draw measured today with PMM2010 power meter under various use-cases:

Powered Off (completely, top switch)   0W
Powered Off (standby)                  15W
Powered On (no signal)                 38W
Powered On (Video from Foxtel iQ Menu) 78W
Powered On (TV from Foxtel iQ)         76-82W
Powered On (Live digital TV)           77-82W

When on and receiving video/TV feed, power seemed to drift upwards when showing brighter scenes. The actual power draw can be  a lot higher (up over 110W) if the room gets brighter — the TV’s ambient light sensor then causes the TV to compensate by brightening the on-screen image.

When switching channels or video modes, I would  see brief spikes of power consumption up to 100-110W  which would drop quickly (over 5 seconds) back down to the ranges specified above.

The standby power draw is odd. “Standby Power Consumption” should be < 0.3W according to the online specifications. The user guide clearly states that the green button on the remote control switches the TV between “On” and “Standby”.

Yet turning the TV to “Standby” using the remote control puts it in a mode where it draws 15W — a far cry from the claimed 0.3W standby power draw. For the last 4 years I’ve been leaving the TV in this ‘standby’ mode 24hrs a day whenever we weren’t watching anything!

The only way to get < 0.3W is to turn the unit completely off using the push button On/Off switch on the top of the TV. (In this mode, the TV no longer responds to the remote control and can only be turned back on with the same push button switch.)

I tried multiple sequences of on, standby and off and confirmed in each case that “standby” draws 15W while “real off” is required in order to have the power draw drop below 1W.

LG LCD TV, type 32LH35FD

My LG 32LH35FD is a 32″ ‘Full HD LCD TV with Built in HD Tuner‘. On the back plate the rating is “100-240V @ 1.1A”.

Power draw measured today with PMM2010 power meter under various use-cases:

Powered Off (standby)        0W
Powered On (no signal)       38W
Powered On (Live digital TV) 60W

The 60W power draw when on is with TV’s own “Power saving” feature set to “Minimum”. Set at “Maximum” with live TV, the power draw dropped to ~40W.

The preceding measurements are non-scientific, taken by hand a couple of times to get a ball-park sense of power draw from each TV. The two main outcomes — both TVs are in the ball-park of common incandescent globes when displaying live TV, and the Sony has an inexplicably high power draw when in “standby” mode.

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5 comments

  1. Excellent research. Why then does the back plate display 1.1A which is 1,100W when you did not consume even close as much?

  2. Thanks for the power data. I have been struggling to find what the difference between standby and the off button was on our Sony tv. It’s an easy decision to use the on/off button now..

  3. Same here! I tested my Sony today. Don’t like it!

  4. Did you measure the standby power soon after turning your TV off? I have a Sony KD55X9000B. Immediately after power off the standby power consumption is about 25W, but then after about 5 to 10 minutes is drops down to 0.2W. Perhaps your model is similar. I assume there is a cooling device (fan maybe) that runs for a while after power down.

  5. For the first person who stated 1.1 Amp was 1,100 watts that is incorrect 1.1 amps is only 132 watts if you would divide 120 volts into 132 watts you would then get 1.1 amps to get amperage you divide voltage into wattage to get amps most appliance operate on 120 volts however in European Countries standard voltage is 208 to 240 therefore the amperage then would only be .55amps for the same appliance.

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