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Pierre-Jean Alzieu
Pierre Anzil
Published on March 25, 2011
Translated by Sam McGeever


  • Screen size 40 inches
  • Resolution 1920 x 1080 pixels
  • HD compatibility (1080i/720p) Yes / Yes
  • HD Ready certification Yes
  • Brightness NC
  • Contrast ratio NC
After testing the Sony Bravia 55EX723 TV, it's time for us to take a look at the new Bravia EX523, which replaces last year's EX603.  It features a PVA display manufactured by Samsung-Sony, backlit with lateral LEDs.  Other than that, the feature list is pretty short.  There's no support for 3D or motion interpolation, called Motionflow on Sony's other TVs.  We tested the 40'' version, but it's also available in both 32'' and 46''.

Build Quality and Design

The first thing that we noticed is the very strong family resemblance with the EX723.  Both TVs have a glossy black plastic frame with a matte finish for the screen.  The only visible difference is the metal trim at the bottom,, which is slightly shinier here on the EX523.

Apart from missing out on Motionflow filters and support for 3D, the EX523 has everything else it needs to stand up to the big boys.  That includes support for DLNA 1.5, online services and video-on-demand.  You also get Sony's new X-Reality picture engine, the updated version of the XrossMediaBar interface and support for 720p Skype (if you add an optional Sony webcam).

Around the outside of the frame and are the back are four HDMI ports, component video, VGA and SCART inputs and an Ethernet port.  There are also two USB ports, meaning you can connect an external storage device and use it to record TV programmes.  You can use the second one to store your own films and videos, but the built-in media player doesn't support many formats.  Without support for MKV video, there's not much point in it, which is a shame.

Matte display largely immune to reflections

V130_dessous Profile

Inputs and outputs

Ghosting and Input Lag

The good news is that Sony has used a relatively responsive PVA panel for this TV, the LTJ 460HQ01, despite the fact that this is an entry-level option in its range.  It took an average of 16.5 ms to completely erase the previous frame, which is faster than average.  Unsurprisingly, compared to our CRT reference monitor, it introduced input lag that won't please the most avid gamers.  It adds a delay of 66 ms, the equivalent of four whole frames, to the video source.

Image Quality

With the default settings, the picture is very saturated.  Alexandre Botella, who tests monitors for us, was so surprised by the colour reproduction that he suggested the EX723 looked more like a laptop display than a television.

Accurate colour reproduction in Custom mode: average deltaE: 2.4

Fortunately, it's possible to drastically improve the quality in just a few seconds.  Once you switch to Custom mode, colour reproduction is accurate and the deltaE falls to 2.4.

Average contrast ratio in Custom mode: 4017:1

The contrast was excellent: with blacks as dark as 0.05 cd/m² against brightness of 201 cd/m², the ratio climbed to 4017:1.  If you consider that the average value for our tests from all of last year was just 2506:1, that's an excellent result.

With an HD film, the results are almost perfect.  The only problem is the jerkiness that isn't smoothed out by motion interpolation, something that might irritate viewers who want absolute fluidity.  Upscaling of SD content wipes out some of the detail, and an external source like a Blu-ray player or a PS3 will do a better job.

Clouding on our test unit

The panel in the TV we tested suffered from uneven backlighting, a problem also known as clouding or the Mura effect.  As you can see in the photo above, light leaks out in areas of the screen that are supposed to be dark.

Audio Quality

The picture quality might be excellent, but it's a shame we can't say the same for the sound.  Sony has clearly cut corners with the speakers.  Unlike on the EX723, the bass is almost entirely missing on the EX523.  At least things are nice and clear because the speakers point towards the viewer.

Energy Consumption

We're once again impressed by the ability of LED backlighting to not only make TVs thinner but also keep energy consumption down.  On this 40'' display, we only measured consumption of 77 W while in use and 0.1 W on standby.  The downside of Edge LED backlighting, though, is that it increases the risk of clouding.
Our Readings
Contrast: 4017:1
Black level: 0.05 cd/m²
Gamma quality: 4.7 / 5
deltaE: 2.4
Average discrepancy across display: 10%
Viewing angles: 2 / 5
Energy consumption:77 W
Multimedia player: 2.2/5

Find and compare our other readings in our Face-off.

We take these readings using the best settings for watching a movie. Cinema mode is generally the one we use. Wherever possible, we set the white levels at 200 cd/m².

See also: How do we test TVs?


  • Accurate colours in Custom mode: average deltaE of 2.4
  • Excellent contrast ratio: 4017:1
  • Matte finish doesn't suffer from reflections
  • Low energy consumption: 77 W


  • No motion interpolation
  • Viewing angles too narrow
  • Media player doesn't support enough video formats
  • Display less responsive than average
  • Clouding on our test unit


The Sony EX523 is an entry-level LED TV with a great picture quality. All that's missing is support for 3D and motion interpolation.
3 Sony Bravia KDL-40EX523 DigitalVersus 2011-03-25 00:00:00
Compare: Sony Bravia KDL-40EX523 to its competitors
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