Samsung UN40F6400 Review (UN40F6400AF)

40 inch Active 3D 120Hz LED TV

by , Senior Editor


Samsung UN40F6400 LED TV
  • Picture quality with front and center viewing
  • Input lag measured at 30ms in Game Mode
  • Wifi with home network provides fast video streaming (3D too) and app downloading
  • Active 3D shows a great deal of depth and a clear picture
  • 2D to 3D conversion
  • Touch remote is easy to use and speeds navigation
  • Samsung has the largest app selection out of all the manufacturers
  • Menu system is user friendly for easy calibration
  • 4 HDMI and 3 USB ports


  • Side angle viewing washes out contrast and color fast
  • Matte screen finish creates room light reflections
  • Voices get lost in sound due to emphasis on background music and sound FX
  • Auto Motion Plus with 2D images (thankfully it can be turned off)

    This is the smallest offering in the F6400 series. The UN40F6400 is a feature heavy 40 inch set. Active 3D and a 120Hz refresh rate are thing a TV of this size do not usually see. That makes it a perfect TV for those who want advanced features like for a small to midsized room. It is those advanced features that set it apart from the F6300 as well. This one is a slight step up for value shoppers with 3D on the list of features they are looking for. The F6400 series doesn't see a lot of competition from other manufacturers due to the size. The LG 42LN5700 is going to be the closest competition, but even that one doesn't include 3D playback.

    Picture Quality Rating: 8.6

    The UN40F6400 doesn't have the clear coat screen seen on top tier models. It's got the semi-matte finish that reflects more in-room light. The resulting image is a toned down since it lacks the brilliance of the clear screens. The natural depth of 2D images is also somewhat. The bright edge LED lighting helps to balance out the downsides of the matte screen by providing more rich colors and a good deal of contrast. The easy to set 10pt white balance really helps get color balance to look just right. Color reproduction is natural and not over saturated. All of that said, from relatively close to front and center we felt the picture displayed was very good with lots of light flow-through to help with depth perception. The picture is remarkably similar to the ES6500 from last year.

    Black Levels and Contrast – Solid Performance

    From a front and center position, black levels on the UN46F6400 are fantastic. That is the key to this TV. Black letter box bars on the Days of Thunder Blu-ray are a deep black. Other dark areas of the screen show just as strong performance without too much loss of detail in shadowy areas. Blacks are certainly not as stout as the best plasma TVs, but for a mid level LED TV they are strong. Contrast has a great showing here too. Light and dark areas of the screen are separated nicely and don't bleed into each other – as long as you are not at side angles.

    Samsung UN40F6400 Contrast
    This shot from the Sports Illustrated Swimsuit Edition Blu-ray shows strong contrast and shadow area detail on the 40F6400

    Side Viewing Angles – Typical for an LED TV

    The biggest problem with this TV's picture is the side angle viewing. Color and contrast degrade pretty early at about 20 degrees off center and get worse faster from there. The wash out is more severe than LED TVs with the previously mentioned clear coat screen. Above and below off center viewing give a similar result. It is important to take into account where this TV is going to be placed so these side viewing angle issues are minimized.

    Samsung UN40F6400 Side Angle Viewing
    This shot provides a clear example of how quickly the contrast and colors degrade as the viewer moves from a front and center position. The second shot is from about 20 degrees of center

    Auto Motion Plus- Very Important Setting

    The Auto Motion Plus feature is set to On by default in all of the preset picture setting modes. It is really only good for watching 3D content on the UN40F6400 – unless you like the “Soap Opera Kitchy Cardboard Cutout” effect which results from eliminating too much natural background blur. For everything but 3D you are better off turning it off or going to the Custom setting within Auto Motion Plus and turning the Blur Reduction setting to 10 and the Judder reduction setting to 0. This is also an acceptable option. The feature creates a lot of background clarification, making images look terribly unrealistic by eliminating natural background blur and causing unnatural looking movement. Turn it off in the Picture Options menu and everything will be fine again. 480i definition content gains slight improvements when the setting is low.

    (Note: to get to the setting click on Menu, swipe across to Picture, Scroll all the way down to Picture Options, Scroll down to AutoMotion Plus.)

    120Hz Processing

    120Hz processing on a 40 inch TV is impressive and on the borderline of not being completely necessary. The 120Hz refresh rate here reduces motion blur when it comes to fast action and side to side panning. One of the biggest benefits is image clarity as well. It's going to be noticed the most during sports programming that has a lot of camera movement. This also applies to shows and movies that utilize camera movement like side to side panning. The UN40F6400 is also going to be a good choice for gaming. A 120Hz refresh rate is going to be much more handy for the fast action of gaming on a set this size.

    Samsung UN40F6400 Days of Thunder
    This shot from the Days of Thunder Blu-ray is an excellent example of the sharp detail, strong contrast, and bright colors the 40F6400 LED TV is capable of from front and center

    3D Performance

    Before you continue to with your 3D content, Change the picture mode to Movie and the Auto Motion to Standard. This is key to getting the best out of any 3D image. In doing so, judder is eliminated and images bright. The resulting image is sharp and clear with a good amount of depth. Colors appeared slightly subdued for 3D images, but they are certainly not bad. As usual for active 3D glasses, a small amount of flicker is present. It may be better suited for dark viewing rooms. Just like the side angle viewing for 2D content, color and contrast fade very quickly when moving from front and center. Overall the UN46F6400 gives a good performance.

    Active 3D glasses for the Samsung UN40F6400
    This year's Active 3D glasses are extremely light and have a more streamlined design

    Another plus when it comes to Samsung is their 3D glasses. The glasses are usually a sore point for the 3D experience. Active 3D glasses in the past have been heavy and uncomfortable to wear for an extended period of time. They also tend to cause a bit of eye strain for the wearer. Samsung's are different. They are light and comfortable. There tends to be a bit of flicker in the glasses is there is a direct light source in the front of the room where you are viewing.

    Gaming – Not Bad After some Tweaks

    Getting to the Game Mode
    Go to the Systems menu near the bottom of the main menu. Scroll down to the General settings and open that menu. Game Mode is located here. It seems like a pain to dig into the menus like this to turn it on or off.

    Samsung UN40F6400 Game Mode
    Crysis on the Playstation 3 is bright and colorful with strong constrast

    Turning on the Game Mode is the best way to go for gaming on the 40F6400. The picture mode in Game Mode has its own settings, and initially look pretty bad. Standard is the only available picture mode while Game Mode is on. Take the time to turn the sharpness down to 10 or less, the Color Space to Auto, Dynamic Contrast to Off, Color Tone to Warm1, and the Screen Size to Screen Fit. Adjust the Backlight and Brightness to your personal preference. This will provide a decent picture quality as well as a cut down on input lag. This made Okami HD and Crysis for the PS3 look fantastic and the input lag was negligible at a decent 30ms. Enabling 3D once again changes the picture mode. Make similar adjustments to get the picture looking better. 3D produced a lot of judder and may not be the best way to enjoy a game. We tried out 3D with Crysis. The effects of depth look great but have a bit of cross talk to take away from the immersion.

    Samsung UN40F6400 Input Lag
    This show how beneficial the Game Mode is for cutting down on input lag.

    Features Rating: 9.0

    New Look and Features for Smart Hub

    Samsung put a lot of effort into re-vamping their Smart Hub platform. I'd certainly say it is an improvement on the UN40F6400. Navigation and content organization received the biggest upgrades and new features like voice-recognition and S-recommendation were added. Voice-recognition features enable a host of searching functions that make it easy to find an app you are looking for or find content to watch on TV or online. The recommendation features suggest shows and movies to watch based on things you like or general queries for a specific actor or genre. These features really enhance the usefulness of the Smart Hub.

    Samsung UN40F6400
    On the Apps page you will find all of your downloaded apps, like the ones listed below. Samsung has also implemented lots of recommendation features this year. On the top of the screen you see some recommended apps

    The content in Samsung's is organized on 5 different pages to make it easy to find exactly what you are looking for. Here is how they are broken down:

    Social is where you will find all of your twitter and Facebook information as well as a host of trending and recommended content to explore on the social web

    The Apps page displays all of your downloaded apps as well as a slew of recommended apps to try out displayed at the top of the screen

    The On TV menu aggregates TV shows that are currently on well as shows that are going to be on soon. The Smart Hub gathers information of previously watched content and shows you things that fall in with your interests

    The Movies & TV Shows screen gathers movies from internet platforms, live broadcasts, and Samsung's Media Hub for you to choose from. From here you can find pricing information and anything else you need for a specific movie.

    The Photo & Video page is for viewing personal photos and videos on the big screen. These may come from connected devices or from over a home network.

    Read our full review of Samsung's 2013 Smart Hub here for more information on apps and other features.

    Web Browser, Touch Pad Controller, and Wifi

    Bing is the default search engine and the home screen when the browser is first opened. Surfing with the touchpad is faster and easier than a traditional 5-way controller. Your thumb moves a cursor round as if it were on a laptop track pad. It's not as efficient as LG's Magic Remote, but we like it. The voice recognition only works for inputting searches if the soft keyboard for the search field is open. The Wifi connection was easy to establish and it help up well while surfing the web. For streaming content it worked really great too.

    Dual Core Processor

    Many of the Smart TVs from the 2013/2014 Samsung lineup have received dual core processors. This is a very nice upgrade for TVs residing in the mid tier category like the UN40F6400. The dual core processor speeds up navigation and web browsing considerably. We recall the slowness of Smart TVs in the past and are very welcoming to this speed boost. The top tier models in the Samsung lineup this year have received quad core processors as an even further upgrade. Since the F6400 is looking to be a value TV, a dual core processor will surely do the trick.

    Touch-Pad Remote - Nifty

    Samsung Smart Touch Remote
    The remote for the UN40F6400 has a swipe pad that makes it easy to switch between the main Smart Hub screens. This one is black instead silver found on the top tier models.

    Swiping on the touch remote is definitely faster than a 5-way controller. We found it to be about 2x faster than pressing arrow buttons. It's the only remote included with the UN40F6400. Be aware that there are no numbers and not too many buttons. Samsung has included an on-screen soft remote to make up for insufficient keys. We didn't find ourselves missing some of the buttons, but having to access an on-screen menu to switch to channel 75 seems like it would be a chore. There are dedicated keys for the Mic, 3D, Smart TV, DVR, and the Menu. The remote also has a nifty back-light button.

    Sound Quality – Room for Improvement

    The speakers can push a plenty of volume at 50% to fill a room. However, voices are weak and overpowered by music or background noise. When viewing Days of Thunder we thought there was ample volume, but we struggled to hear voices throughout the movie. We tried Standard, Music, Movie, Clear Voice, and Amplify none of which improved the situation. Clear Voice or Standard is probably our preferred mode for this TV. Standard is probably the best all around, but it doesn't have the full range we have seen on some of the LG LED TVs. Turning on DTS TruSurround in the Sound Effects menu helps a little with the flatness, but doesn't do a lot for the range.

    Appearance and Design

    Samsung UN40F6400
    This shot shows the qudrapod stand as well as the thin bezels. Notice how dark the stand is compared to last year's that were a bright chrome

    The 4 legged quadrapod stand has a dark charcoal metallic color instead of the black from last year. The stand allows for about 25 degrees of swivel in either direction. The glossy black plastic bezels measures half an inch with a clear acrylic plastic on the outside to frame them up nicely. It's hard to notice the clear frame without looking for it. The overall depth is just under 2 inches. It's a simple but attractive design.

    Value Rating: 8.8

    The Samsung UN40F6400, which sells for $849.99, faces a lot of competition in the 40-inch size class. LG's Google TV, the 42GA6400, sells for the same price with a more fleshed out internet suite from Google, a QWERTY Magic Remote, and 2 more diagonal inches. Vizio's E420d has similar features but lacks the updated appearance and big brand name. The kicker is, it sells for less than $600.

    Overall Rating: 8.8

    Robert Wiley Having reviewed and written about Television Technology for over 10 years, Wiley never tires of researching the newest qualitative trends related to the technology. Most people do not get excited about possibilities behind the latest video engine...Wiley does. Read more about Robert
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