LG SM9970 8k TV Review

Tested using Methodology v1.5
Reviewed Feb 03, 2020 at 08:39 am
LG SM9970 8k Picture
Mixed Usage
Value for price beaten by
: Not at the latest test bench
Value for price beaten by
: Not at the latest test bench
TV Shows
Value for price beaten by
: Not at the latest test bench
Value for price beaten by
: Not at the latest test bench
Video Games
Value for price beaten by
: Not at the latest test bench
HDR Movies
Value for price beaten by
: Not at the latest test bench
HDR Gaming
Value for price beaten by
: Not at the latest test bench
PC Monitor
Value for price beaten by
: Not at the latest test bench
This TV was replaced by the LG NANO99 8k 2020
Type LED
Resolution 8k

The LG 75SM9970PUA is a good 8k TV that features LG's Nanocell technology. Its IPS panel has decent viewing angles that's well-suited for a moderately large room, and it's well-equipped to handle glare and reflections in very bright environments. It has great motion handling and input lag, however, FreeSync support is noticeably lacking. On the upside, there are some forward-thinking features such as HDMI 2.1 support and eARC, and although an external box is required to display 8k content, it's provided by LG for free. Unfortunately, native 8k content is pretty scarce at this time, so for now, it's a good choice for those in need of a large TV and don't mind waiting for more content to be widely available.

Our Verdict

7.5 Mixed Usage

The LG 75SM9970PUA is a good TV for most uses. Its large size and decent viewing angles are great for medium-sized rooms, and it can get bright enough to overcome glare. It has low input lag for those who want to game on a giant screen, but unfortunately, there are some uniformity issues that can be distracting. Overall, though, it's a good TV for most content.

  • Excellent upscaling.
  • Outstanding motion handling.
  • Low input lag.
  • Bad color accuracy.
  • Mediocre contrast ratio.
  • Difficult to display native 8k.
7.0 Movies

The LG 75SM9970PUA is an okay TV for watching movies. Its size provides an immersive experience and it has impressive motion handling to keep the picture crisp. Unfortunately, contrast ratio and black uniformity are only mediocre, so it may not be the best choice for dark room viewing. It's not the most color accurate TV either, but it upscales lower resolution content well without any visible artifacts.

8.0 TV Shows

The LG 75SM9970PUA is great for watching TV shows. It has a good peak brightness and excellent reflection handling for watching daytime TV, but its low contrast ratio and mediocre black uniformity make it less suitable for dark room viewing. The TV can display lower resolution content well, such as cable TV, and it has decent viewing angles so everyone can see the picture clearly.

8.0 Sports

The LG 75SM9970PUA is great for watching sports. Its size, resolution, and viewing angles make this TV the perfect choice for watching the big game with a large group of friends and family. It has outstanding motion handling to keep motion blur to a minimum, but there's some dirty screen effect that can be distracting.

7.8 Video Games

The LG 75SM9970PUA is a good TV for gaming. It has a low input lag for a responsive gaming experience, and its impressive motion handling is great for fast-paced games. The TV's resolution and size provide an immersive experience for atmospheric RPGs, but the lack of variable refresh rate is a bit disappointing.

6.8 HDR Movies

The LG 75SM9970PUA is an okay TV for watching movies in HDR. It delivers a good picture quality, even for lower resolution content, but its HDR performance is limited, as it isn't able to produce dark and saturated colors well due to its low contrast ratio. Although there's a full array local dimming feature, its effectiveness is questionable, as there's noticeable blooming and flickering when it's enabled.

7.3 HDR Gaming

The LG 75SM9970PUA is a decent TV for HDR gaming. It has nearly everything that gamers ask for, such as fast response time and low input lag; however, variable refresh rate doesn't seem to function at this time. It upscales lower resolution games well, and it has an acceptable HDR performance thanks to its great color gamut and decent peak brightness.

8.2 PC Monitor

The LG 75SM9970PUA is a great TV for use as a monitor. It has a fast response and low input lag for a responsive desktop experience, and there's no risk of permanent burn-in with user interface elements being always in the same place. Text is sharp and legible, and the TV can display chroma 4:4:4 properly.

  • 7.5 Mixed Usage
  • 7.0 Movies
  • 8.0 TV Shows
  • 8.0 Sports
  • 7.8 Video Games
  • 6.8 HDR Movies
  • 7.3 HDR Gaming
  • 8.2 PC Monitor
  1. Updated Nov 27, 2020: We've retested the input lag and supported resolutions with an HDMI 2.1 source and the latest firmware version 05.00.02.
  2. Updated May 21, 2020: Converted to Test Bench 1.5.
  3. Updated Feb 21, 2020: Converted to Test Bench 1.4.


Test Results

perceptual testing image
Market Context
Market Context
Market Context

The LG 75SM9970PUA is LG's flagship 2019 Nanocell TV, but not the only one with an 8k resolution in their entire lineup. They've also released the OLED88Z9PUA, which is an 8k OLED TV. There are significantly more expensive 8k TVs on the market, such as the Sony Z9G, but Samsung's Q900R is its main competitor.

Curved No

The LG 75SM9970PUA's design is excellent. It's nearly identical to the LG SM8600, but the stand has been upgraded slightly with some metal on the inside for better support. Like the LG SM9500, it has cable management built into the back of the stand.


The stand is large and is a mix of metal and plastic. The stand's arc crosses to the front of the TV, so you may have to consider its positioning if you have a soundbar.

Footprint of the 75" model: 35.2"x15.1"

Wall Mount VESA 600x400

The TV has a plain metal back with a brushed finish. Cable management is built into the stand.

Borders 0.55" (1.4 cm)

The borders are slightly thicker than the LG SM9500 and they protrude from the screen.

Max Thickness 2.80" (7.1 cm)

The 75SM9970PUA has a thin profile. The stand is slightly bigger than the SM9500, but the TV won't stick out when wall-mounted.

Build Quality

The 75SM9970PUA has a good build quality. The stand is a mix of metal and plastic, while the back of the TV is metal. It feels much more stable than the SM9500, which had a fully plastic stand. However, our unit has a missing screw at the top left corner, but your experience may vary.

Picture Quality
Picture Quality
Native Contrast
898 : 1
Contrast with local dimming
2622 : 1

The LG 75SM9970PUA has a mediocre native contrast ratio, even for an IPS panel. However, it does improve significantly when local dimming is enabled. If you want an 8k TV with a VA panel resulting in a better contrast ratio, check out the Samsung Q800T QLED.

Picture Quality
Local Dimming
Local Dimming

Local dimming performance is disappointing. The backlight struggles to keep up at times, causing the leading edge of objects to appear dimmer, and there's a noticeable flickering of the image. In dark scenes with specular highlights, it performs better, but there's some blooming in regular content as well as with subtitles. It's very similar to the SM9500, but the black level is slightly higher so as not to crush details in dark scenes.

Picture Quality
SDR Peak Brightness
SDR Real Scene Peak Brightness
381 cd/m²
SDR Peak 2% Window
665 cd/m²
SDR Peak 10% Window
757 cd/m²
SDR Peak 25% Window
685 cd/m²
SDR Peak 50% Window
441 cd/m²
SDR Peak 100% Window
370 cd/m²
SDR Sustained 2% Window
268 cd/m²
SDR Sustained 10% Window
303 cd/m²
SDR Sustained 25% Window
337 cd/m²
SDR Sustained 50% Window
357 cd/m²
SDR Sustained 100% Window
370 cd/m²

The 75SM9970PUA's peak brightness is good. There's quite a bit of variation between different content, but the TV can get bright enough to overcome glare in a bright room.

Brightness was measured after calibration, using 'ISF Expert Dark' Picture mode, with Local Dimming set to 'High', and Color Temperature set to 'Warm 1'.

The TV can get brighter if you set it to 'Vivid' Picture Mode with its default settings, but at the cost of picture accuracy.

Picture Quality
HDR Peak Brightness
HDR Real Scene Peak Brightness
498 cd/m²
HDR Peak 2% Window
761 cd/m²
HDR Peak 10% Window
941 cd/m²
HDR Peak 25% Window
821 cd/m²
HDR Peak 50% Window
543 cd/m²
HDR Peak 100% Window
456 cd/m²
HDR Sustained 2% Window
304 cd/m²
HDR Sustained 10% Window
374 cd/m²
HDR Sustained 25% Window
422 cd/m²
HDR Sustained 50% Window
439 cd/m²
HDR Sustained 100% Window
455 cd/m²

HDR peak brightness is decent, but it's significantly lower than the SM9500.

Brightness was measured before calibration using the 'Cinema' Picture Mode, with Backlight set to '100', Local Dimming set to 'High', and Color Temperature set to 'Warm 2'. Dynamic tone mapping was disabled as well.

You can achieve higher brightness with 'Vivid' mode, at its default settings.

Picture Quality
Gray Uniformity
50% Std. Dev.
4.854 %
50% DSE
0.215 %
5% Std. Dev.
0.618 %
5% DSE
0.112 %

The 75SM9970PUA has decent gray uniformity. There's vignetting at all corners and dirty screen effect throughout the screen, which is most noticeable when watching sports. However, it's more uniform in dark scenes.

Picture Quality
Viewing Angle
Color Washout
27 °
Color Shift
52 °
Brightness Loss
31 °
Black Level Raise
70 °
Gamma Shift
28 °

Like most IPS TVs, the 75SM9970PUA has decent viewing angles. When viewed from the side, the most noticeable change is color shifting, followed by a decrease in brightness.

Picture Quality
Black Uniformity
Native Std. Dev.
2.115 %
Std. Dev. w/ L.D.
0.964 %

The 75SM9970PUA has mediocre black uniformity, as there's a considerable amount of clouding throughout the screen. It's much more uniform when local dimming is enabled, but there's noticeable blooming.

Picture Quality
Screen Finish
Total Reflections
2.8 %
Indirect Reflections
0.5 %
Calculated Direct Reflections
2.3 %

The 75SM9970PUA has excellent reflection handling and you shouldn't have any issues with glare in well-lit rooms.

Picture Quality
Pre Calibration
White Balance dE
Color dE
Color Temperature
5695 K
Picture Mode
Expert (Dark Room)
Color Temp Setting
Warm 2
Gamma Setting

Out of the box, the 75SM9970PUA's color accuracy is bad. There are inaccuracies with many colors, and the gamma is too low, causing most scenes to appear brighter than they should.

Our measurements were done with Color Temperature set to 'Warm 2', as we expect it to be the best setting for most people, and it's the default color temperature of the three most accurate presets (ISF Expert Bright, ISF Expert Dark, and Technicolor).

Picture Quality
Post Calibration
White Balance dE
Color dE
Color Temperature
6680 K
White Balance Calibration
22 point
Color Calibration
Auto-Calibration Function

After calibration, white balance and gamma are nearly perfect. There are still some inaccuracies with the color blue, but shouldn't be noticeable to the naked eye, and color temperature is slightly colder than our target of 6500K. The TV has an auto-calibration feature, but it would still require the use of a colorimeter.

Calibration was done with Color Temperature set to 'Warm 1'.

You can see our recommended settings here.

Picture Quality
480p Input

The 75SM9970PUA can upscale 480p content well and it looks a lot like the Samsung Q900R's upscaling.

Picture Quality
720p Input

Upscaling of 720p content such as cable TV looks good, with no signs of artifacts.

Picture Quality
1080p Input

Upscaling of 1080p content looks excellent, slightly better than the Samsung Q900R.

Picture Quality
4k Input

Upscaling of 4k content is outstanding and looks better than the Samsung Q900R.

Picture Quality
8k Input

Update 05/14/2020: We've received the 'upgrader' box and tested it. We were able to display an 8k image, but only from a USB drive or external drive, not through an HDMI connection.

Unfortunately, the SM9970 requires an external 'upgrader' box in order to accept an 8k signal. This box is available for free, and we've ordered it, but we aren't currently able to test the 8k performance of the TV. We'll update the review once we receive it.

Picture Quality
Picture Quality
Color Gamut
Wide Color Gamut
DCI P3 xy
88.14 %
DCI P3 uv
94.16 %
Rec 2020 xy
65.01 %
Rec 2020 uv
71.89 %

The 75SM9970PUA has an impressive HDR color gamut. The EOTF overshoots the target PQ curve by a bit, so some scenes may appear slightly brighter. Game mode doesn't seem to change the EOTF by much, as you can see here.

If you want to make HDR content brighter, you have to set Dynamic Contrast to 'High' or see our recommended settings here. This results in a much brighter image in HDR content, as shown in this EOTF.

Picture Quality
Color Volume
Normalized DCI P3 Coverage ITP
66.5 %
10,000 cd/m² DCI P3 Coverage ITP
35.1 %
Normalized Rec 2020 Coverage ITP
53.3 %
10,000 cd/m² Rec 2020 Coverage ITP
28.5 %

The 75SM9970PUA has a mediocre color volume. It can't produce dark, saturated colors due to its low contrast ratio.

Picture Quality
Color Depth
10 Bit
Red (Std. Dev.)
0.114 dE
Green (Std. Dev.)
0.121 dE
Blue (Std. Dev.)
0.094 dE
Gray (Std. Dev.)
0.085 dE

Gradient performance is great. There's some banding, particularly with the color green. The Smooth Gradation feature doesn't seem to affect our test pattern, but it does work with regular content; however, it may cause a loss of fine details in some scenes.

Picture Quality
Temporary Image Retention
IR after 0 min recovery
0.04 %
IR after 2 min recovery
0.00 %
IR after 4 min recovery
0.00 %
IR after 6 min recovery
0.00 %
IR after 8 min recovery
0.00 %
IR after 10 min recovery
0.00 %

There's some temporary image retention for a very short time, but it shouldn't be noticeable after 2 minutes of recovery.

Picture Quality
Permanent Burn-In Risk
Permanent Burn-In Risk

Like most IPS panels, there's no risk of permanent burn-in.

Response Time
80% Response Time
2.8 ms
100% Response Time
11.8 ms

The LG 75SM9970PUA has an impressive response time; there should be very little blur trail behind fast-moving objects. However, there's a significant amount of overshoot in every transition, causing the appearance of some artifacts. The backlight's flickering can also lead to duplication of the image.

PWM Dimming Frequency
240 Hz

The 75SM9970PUA uses PWM to dim the backlights. Flickering is present at all brightness settings and can cause duplication of the image. The backlight always flickers at 120Hz when in 'Game' mode.

Black Frame Insertion (BFI)
Optional BFI
Min Flicker for 60 fps
60 Hz
60 Hz for 60 fps
120 Hz for 120 fps
Min Flicker for 60 fps in Game Mode
60 Hz

This TV has an optional black frame insertion feature to help reduce motion blur. To enable it, go to Tru Motion in the settings menu and set Motion Pro to 'On'. When displaying an image at 120Hz, the flickering is always on and activating Motion Pro will only cause a decrease in brightness.

Motion Interpolation
Motion Interpolation (30 fps)
Motion Interpolation (60 fps)

The 75SM9970PUA can interpolate content up to 120Hz. In fast-moving scenes, the interpolation can sometimes struggle to keep up, causing motion to appear erratic and the appearance of some artifacts, which is very similar to the SM9500. To enable motion interpolation, set TruMotion to 'User' and adjust the sliders to your preference.

Frame Hold Time @ 24 fps
29.9 ms
Frame Hold Time @ 60 fps
4.9 ms

Due to the TV's high refresh rate, there may be some stutter in lower frame rate content. If this bothers you, enabling Motion Interpolation can help.

24p Judder
Judder-Free 24p
Judder-Free 24p via 60p
Judder-Free 24p via 60i
Judder-Free 24p via Native Apps

The 75SM9970PUA can remove judder from all sources. To remove judder, you must enable Real Cinema in the Picture Option Settings menu.

Variable Refresh Rate
Native Refresh Rate
120 Hz
Variable Refresh Rate
G-SYNC Compatible
4k VRR Maximum
4k VRR Minimum
No VRR support
1080p VRR Maximum
1080p VRR Minimum
No VRR support
1440p VRR Maximum
1440p VRR Minimum
No VRR support
VRR Supported Connectors
No VRR support

Update 02/21/2020: LG has confirmed that the SM9970 does not support any variable refresh rate technologies.

The LG SM9970 has a high native refresh rate, but doesn't support any of the variable refresh rate technologies found on much of LG's lineup.

Input Lag
1080p @ 60 Hz
18.5 ms
1080p @ 60 Hz Outside Game Mode
135.0 ms
1440p @ 60 Hz
18.6 ms
4k @ 60 Hz
18.5 ms
4k @ 60 Hz + 10 bit HDR
20.6 ms
4k @ 60 Hz @ 4:4:4
18.3 ms
4k @ 60 Hz Outside Game Mode
135.0 ms
4k @ 60 Hz With Interpolation
139.1 ms
8k @ 60 Hz
22.4 ms
1080p @ 120 Hz
7.7 ms
1440p @ 120 Hz
7.7 ms
4k @ 120 Hz
7.9 ms
1080p with Variable Refresh Rate