The Super UHD LG SK 9000 is a 4k TV with very good performance for a range of usages. The picture quality is good in a bright room, and the TV can get bright to overcome glare. It also has great reflection handling, and the image remains accurate when viewed at an angle. Unfortunately, the dark-room performance is sub-par as the native contrast ratio is low and blacks appear gray, despite the full-array local dimming.
The design of the LG SK9000 is very similar to last year's SJ8500. It has the same familiar curved stand, although it is a bit thinner this year and there is a bit more flex to the stand. The color of the frame is more uniform, with a black back instead of the white back of last year's model. There are some practical limitations as there is only very basic cable management and the stand does not allow you to place a soundbar directly in front of the TV.
The stand is curved and looks very similar to last year's SJ9500. It has a slightly darker metal finish and is slightly narrower. The stand does wobble a bit if the floor shakes.
Footprint of the 55" TV Stand: 9.8" x 32.5"
The borders of the TV are thin, and look great. Similar to the SJ9500, the bezel does not surround the LCD panel. The panel is attached on top of the frame and could be damaged if knocked on the side. Care should be taken when moving the TV, as it could be damaged if knocked, similar to what happened to our SJ8500.
The TV runs fairly cool. The full array backlight results in a more uniform temperature throughout the back body of the TV. No part of it gets warm enough to cause any issues.
Good build quality. We noticed a small gap between the main panel and exterior bezel, but this should not be an issue. Like the SJ8500, the LG 55SK9000 is almost entirely plastic, but there isn't too much flex.
The LG SK 9000 produces a good picture quality. The native contrast ratio is decent, in dark rooms blacks will be grayer. It has a full array local dimming, but the algorithms are not responsive enough and we don't recommend using it on 'High'. It is much brighter than the SJ8500, but very small highlights get dimmed by the local dimming feature, which is the opposite of what should happen. It has an IPS panel and has a mediocre viewing angle, better than VA panels like the Sony X900F but worse than OLED panels like the LG C7. It also has excellent reflection handling, so it is a good choice for a variety of room types. The gray uniformity is decent, but there is noticeable dirty screen effect which is not good for sports fans.
The native contrast ratio on the SK9000PUA is decent, as is typical of IPS panels. When in a dark room, blacks will look more gray than black. This is less noticeable when in a brightly lit room.
The local dimming feature is ineffective at increasing the contrast ratio.
The local dimming feature on the SK9 000 is not responsive enough. It reacts too slowly to moving highlights, and the dimming zones turn on and off too late. It is very similar to the Vizio M Series 2017. We do not recommend using the 'High' setting. 'Medium' or 'Low' work best depending on personal preference.
Very good SDR peak brightness, bright enough for most rooms. Highlights appear dim, this is due to the poor local dimming feature. If you find highlights too dim, set the 'Local Dimming' setting to Low or Off.
This test was done with the 'Contrast' set to '90', which is our recommended value to get the brightest TV possible without causing white crush.
Decent peak HDR brightness. Very small highlights are only noticeable in the sense that they are dimmer than the rest, again a symptom of the poor local dimming. Real scenes are bright enough for most rooms, although still far from the target 1000 cd/m² to fully appreciate HDR content.
Decent overall gray uniformity on the LG SK 9000. The sides of the screen are darker than the rest, but this is not as noticeable as when it is darker in the center. There is noticeable dirty screen effect in the center; this will be especially noticeable when watching sports.
Mediocre viewing angle on the SK9000, far better than most TVs with VA panels, but far worse than TVs with OLED panels. Colors and brightness shift when viewing off angle, making this TV an okay, but less than ideal choice for a room where people will frequently be watching from the side of the TV.
Poor black uniformity on the SK9000. When local dimming is off, there is noticeable backlight bleed across most of the screen.
With local dimming set to 'High', there is visible blooming around the image. The full array local dimming on the SK9000 is turning the zones off, but the results are much worse than other FALD TVs like the Sony X900F.
Decent reflection handling on the SK 9000, identical to the SJ8500. The semi-gloss finish diffuses reflections a bit, reducing their intensity. These results should be fine for most rooms.
The most accurate results out of the box were obtained with the 'Expert (Dark Room)' picture mode. Color and White Balance dE were good, but the color temperature was cold, giving everything a slightly blue tint. The color and white balance delta is low enough that most people won't notice.
Excellent white balance after calibration. Color dE was still a bit high, as the Color Management System in the SK9000 was not very effective at correcting the blue errors. Gamma is very close to our target, shifting a little off target at the low and high end of our inputs.
You can see our recommended settings here.
Good coverage of the P3 color space, the TV is able to display a wide color gamut.
The HDR EOTF in the 'Technicolor Expert' picture mode is too bright for most of our PQ curve, and rolls of gradually at the peak brightness of the TV. The 'PC' and 'Game' EOTF curves are very similar to that of 'Technicolor Expert', which is good.
When displaying HDR content in 'PC Mode', the SK9000 does not properly detect the wide color gamut so colors appear washed. This is the same as the C8.
Decent color volume, but the LG 55SK9000 is unable to produce deep, dark blacks due to its poor contrast ratio and ineffective local dimming. It is also inconsistent in producing bright saturated colors. Color volume is worse than last year's SJ8500.
There were some issues with the SK9000's gradient handling that are not reflected in our testing score. Large areas of near-uniform color showed large areas of banding, worse than the C8. This can be reduced by enabling the TV's 'MPEG Noise Reduction' feature, which enables the gradient smoothing feature of the SK 9000. This helps reduce banding but also causes a loss of detail.
The TV does show some signs of image retention. Only a faint outline of the logo is visible, and it is completely gone before 2 minutes recovery. It is an improvement over the SJ8500, and there is not enough persistence for it to be an issue for most people.
While IPS panels can have some temporary image retention, there doesn't appear to be any risk of permanent burn-in as seen in our long-term test.
The LG SK9000PUA has great motion handling. The response time is slightly improved over the SJ8500, resulting in fluid motion with a short motion trail and low stutter with 24 and 60 fps content. The backlight has been completely redesigned over the SJ8500 and 9500, but there is still noticeable flicker when dimming the backlight. The TV adds black frame insertion, and the TV can reduce the flicker frequency to 60Hz, which helps motion appear more fluid. Movies played from any source appear smooth, although the TV is inconsistent in its ability to remove judder from 60 fps content.
Excellent response time on the LG 55SK9000PUA, great for watching sports or fast paced movies. Most of the blur visible in the photo is caused by 60 fps persistence when there is no flicker, but there is a small motion blur trail behind the logo. There is some overshoot on the 100% transitions but it is minor and should not cause any ghosting. Only a short trail can be seen following fast-moving objects.
The SK9000PUA uses PWM to dim the backlight, which helps to clear up motion slightly, but results in some duplications following fast-moving objects, as can be seen in the motion blur box photo. This causes the backlight to flicker, starting at any backlight setting other than '100'. It uses a different type of PWM dimming than the SJ8500, so it is a bit less noticeable. People sensistive to flicker should consider a nearly flicker-free alternative, like the Sony X900F.
When 'Motion Pro' is enabled, the backlight flickers to match the refresh rate of the content on the screen to reduce persistence blur. With 120 Hz content the natural refresh rate of the backlight is better, so Motion Pro' must be set to Off.
The SK 9000 has a native 120hz panel and can interpolate lower frame rate content up to 120 fps. Motion interpolation can look very strange to people, and in scenes with fast motion, there are some artifacts.
To enable motion interpolation (also called the Soap Opera Effect) set 'TruMotion' to 'User'. For a 30fps source increase the 'De-Judder' slider, and for a 60fps source increase the 'De-Blur' slider.
The LG SK9000PUA displays 60 and 24 fps content without stutter. The response time of the LCD results in smooth motion even in long panning shots.
The SK9000PUA is able to consistently remove judder from 24 fps content, but is inconsistent in its handling of 60 fps content.
To enable this feature, for any content, the 'Real Cinema' option must be turned on.
Update 05/02/2018: We retested 24p judder over 60p on the SK9000 and it correctly passed the test.
The SK 9000 does not support any of the variable refresh rates technologies such as G-Sync, FreeSync, or the native VRR which will be available in HDMI 2.1.
Great low input lag on the LG SK9000. The input lag is low on any supported resolution except in 4k with HDR enabled, although it is still low enough for most gamers. It supports chroma 4:4:4 and 1080p @ 120 Hz, great for use as a PC Monitor. Like the C8, it does not support 1440p resolution.
Excellent low input lag on the SK 9000. Strangely, the input lag is slightly higher on 4k content with HDR enabled (this is the case with the C8 too), but it is still low enough that HDR games will be responsive for most games.
There were no issues with most common resolutions. The LG 55SK9000 does not support 1440p resolution. When in PC Mode with HDR enabled, the TV does not properly support 4:4:4 color and colors appear washed out. In PC Mode a sharpness setting of '0' is the true 0 level.
The SK9000 does not have a component input. It supports composite input via the included adapter.
The TV does not have an analog audio output. To connect a wireless headphone you will need a digital to analog converter like this one.
The sound quality of the LG SK9000 is decent for a TV. The frequency response is fine, and the TV can get loud without producing too much distortion. Despite this, it is no match for a dedicated surround sound system or even a cheap soundbar. It should be noted that this TV was tested with the Magic Sound Tuning enabled.
Decent frequency response for a TV. It can get very loud, but there is some dynamic range compression as the volume is increased. The low frequency extension is good, much better than most TVs, so it can produce a decent amount of bass. However, the room correction system (Magic Sound Tuning) wasn't able to correct the modes of our test room (the bumps between 200Hz and 300Hz).
The harmonic distortion of the TV is slightly better than average. It is contained at lower volumes, and even at maximum it isn't too bad. The sharp distortion peaks at around 2k and 7k can make the sound of these frequencies a bit harsh.
The LG SK9000 runs the latest version of LG's smart operating system, webOS. It has a decent selection of built-in apps, and the LG content store provides quick access to thousands of third-party apps, although it is not as good as the Google Play Store found on Samsung or Sony TVs. The remote is compact and well built. The design is not as polished as the one found with high-end Samsung or Sony TVs, but it works well. The new voice control functions are very powerful and work well, and can interface with a variety of other devices.
The webOS interface is very similar to last year's model, with the inclusion of the improved search functionality. The menu is very fast and responsive, although the less powerful α7 processor in the SK9000 means slightly more lag than the C8 with its more powerful α9.
There were no ads displayed during our testing of the SK 9000, but like the C8, the menu still mentions advertising cookies so the TV may have ads at some point or in some regions.
If anyone notices any ads in their TV, let us know and we'll update the review.
Update 7/12/2018: We have found ads on other 2018 LG TVs as shown here, so we assume all 2018 LG TVs have ads. The score has been updated to reflect this.
The SK9000 comes with most of the popular apps preloaded, including Netflix, Amazon Video, Hulu and YouTube.
The remote is identical to the one found in this year's OLED C8. It provides quick access to most common functions. When pointed at the screen the remote functions as a pointer, making navigating the menus or entering text a breeze.
The remote also provides quick access to the powerful ThinQ AI voice search/smart assistant. The voice control feature allows you to perform searches across all of the installed video providers, control almost TV functions (including setting a sleep timer). The TV can even interact with other ThinQ compatible devices, including dishwashers, laundry machines, ovens, etc... It will also be able to interact with Google Home and Amazon Alexa compatible devices.
The LG TV Plus app offers quick access to most TV features and controls, and also has the ability to stream multimedia from your phone directly to the TV. Like Sony's remote offering, it does not work for text entry.
There is a single rocker joystick under the TV in the middle of the screen which provides quick access to most functions of the TV. It can power the TV, change inputs, change volume and channels. Very similar to other LG TVs including the UJ6300.
We tested the 55" SK9000 (55SK9000PUA). In the U.S. the SK8500 has been renamed to the SK9000, but in other regions, it is still known as the SK8500. We expect our results to be valid for both model numbers (LG 55SK9000PUA and LG 65SK9000PUA) and for the 49" model that is not available in the U.S.
If someone comes across a different type of panel or their LG SK9000 doesn't correspond to our review, let us know and we will update the review.
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The LG SK9000 offers good performance for most viewing habits but is especially suited for bright rooms. See our recommendations for the best TVs on the market.
The LG SK9000 is a better choice if you are going to watch TV from the side, as it has better viewing angles. The Sony X900F is better for directly in front seating arrangements. The LG SK9000 has better input lag and better black frame insertion (BFI), which make it slightly better for gaming and can be attractive to gamers. The Sony X900F has better contrast and local dimming and much better black uniformity so it can display deeper blacks that improve picture quality in a dark room and make it a much better TV for movies. The Sony also has a faster response time and better gray uniformity that make it a marginally better choice for sports fans.
The LG SK9500 is slightly better than the LG SK9000. The LG SK9500 has slightly better response time which is great if you watch sports, and better contrast ratio and black uniformity that produce marginally better blacks while watching movies. The LG SK9500 can get brighter and this is good as you can watch TV shows in a slightly brighter room.
The LG SK9000 is better than the LG SK8000. The LG SK9000 can get brighter, so it is more suitable if you have a bright room, but also has better local dimming and better black uniformity which make it a slightly better option for darker rooms too. The SK9000 has better performance when displaying HDR content. On the other hand, the LG SK8000 has a better response time and better gray uniformity which make it a slightly better choice if you are a sports fan.
If you've got a room with wide seating and several light sources, then the LG SK9000 is a better choice as it has better viewing angles and better reflection handling. Although its local dimming algorithm is better than the Samsung's, it cannot display deep blacks in a dark room due to the IPS panel. So for a dark room with seating directly in front, the Samsung NU8000 is a better choice. The better contrast ratio and black uniformity allow for deeper blacks and offer a better movie experience. Also, the Samsung NU8000 is equipped with the Freesync variable refresh rate technology to eliminate tearing when you play video games.
The SJ8500 is the predecessor to the SK9000. They have a very similar design and offer similar performance. The SK9000 adds a full array backlight and is much brighter, so it is better suited for a bright room. It also adds a black frame insertion feature, which is great for gamers. The SK9000 is a significant upgrade over the SJ8500, but until the price comes down, the SJ8500 is a better buy.
Samsung's 2017 MU8000 is a good mid-range TV. It has better native contrast than the SK9000, but is not as bright and has a worse viewing angle. It has very similar motion handling and slightly worse input lag but is still responsive enough for most gamers. If you can still find the MU8000 and don't need a large viewing angle, it is the better buy.
The OLED LG C7 is one of the top-line OLED TVs from 2017. It offers exceptional picture quality with infinite blacks, and an excellent picture quality. It handles motion better than the SK9000 and has similar input lag. It does come with the risk of burn-in and temporary image retention, but overall is an excellent TV. The LG B7 or C7 are both excellent choices if you can expand your budget a bit over the SK9000.