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TCL S4/S450G vs TCL Q651G

Side-by-Side Comparison

    Top
    Main Differences
    Brightness
      HDR BrightnessHDR Brightness In Game ModeSDR Brightness
    Picture Quality
      ContrastBloomingLighting Zone TransitionsContrast And Dark Details In Game ModeHDR BrightnessHDR Brightness In Game ModePQ EOTF TrackingSDR BrightnessColor GamutColor VolumePre CalibrationPost CalibrationGray UniformityBlack UniformityViewing AngleReflectionsHDR Native GradientLow-Quality Content SmoothingUpscaling: Sharpness ProcessingPixels
    Black Level
      ContrastLighting Zone PrecisionLighting Zone TransitionsContrast And Dark Details In Game ModeBlack Uniformity
    Motion
      Response TimeFlicker-FreeBlack Frame Insertion (BFI)Motion InterpolationStutter24p JudderVariable Refresh Rate
    Color
      SDR Color VolumeHDR Color VolumeSDR Pre-Calibration Color AccuracySDR Post-Calibration Color AccuracyHDR Pre-Calibration Color AccuracyHDR Post-Calibration Color Accuracy
    Processing
      PQ EOTF TrackingLow-Quality Content SmoothingUpscaling: Sharpness ProcessingHDR Native Gradient
    Game Mode Responsiveness
      Input LagSupported ResolutionsVariable Refresh RateCAD In Game Mode @ Max Refresh RateCAD In Game Mode @ 120HzCAD In Game Mode @ 60HzPS5 CompatibilityXbox Series X|S Compatibility
    Motion Handling
      Stutter24p JudderResponse TimeFlickerBlack Frame Insertion (BFI)Motion Interpolation
    Reflections
      Direct ReflectionsAmbient Black Level RaiseTotal Reflected LightAmbient Color Saturation
    Panel
      Viewing AngleGray UniformityPanel Technology
    Inputs
      Input LagSupported ResolutionsPS5 CompatibilityXbox Series X|S CompatibilityInput SpecificationsInput PhotosAudio PassthroughTotal InputsHDR Format Support
    Design
      StyleAccelerated Longevity TestStandBackBordersThicknessBuild Quality
    Smart Features
      InterfaceAd-FreeApps and FeaturesRemoteTV ControlsIn The BoxMisc
    Sound Quality
      Frequency ResponseDistortion
    Comments

Products

TCL S4/S450G
TCL Q651G

Tested using Methodology v1.11

Updated Oct 04, 2024 12:43 PM

SEE PRICE
Amazon.com

Tested using Methodology v2.0.1

Updated Jul 28, 2025 02:51 PM

SEE PRICE
Amazon.com
TCL S4/S450G Picture
TCL Q651G Picture
  1. Recommended in 13 articles:
  2. Best TVs
  3. 65-Inch
  4. 55-Inch
  5. 10

Our Verdict

TCL S4/S450G

TCL Q651G

The TCL Q651G is better than the TCL S4/S450G, as it's a higher-tier product. The Q651G is noticeably brighter and more colorful than the S4, and it has more gaming features, with VRR and 120Hz support at 1080p and 1440p in its 55, 65, and 75 model sizes, and support for 4k @ 120Hz on its two largest 85 and 98-inch models. The S4 doesn't have VRR and is limited to 60Hz at all resolutions. It has better contrast than the Q651G, but the S4 isn't as good a TV overall.

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Variants

  • 43S450G (43")
  • 50S450G (50")
  • 55S450G (55")
  • 65S450G (65")
  • 75S450G (75")
  • 85S450G (85")
  • 43Q651G (43")
  • 50Q651G (50")
  • 55Q651G (55")
  • 65Q651G (65")
  • 75Q651G (75")
  • 85Q651G (85")
  • 98Q651G (98")
Read more

Main Differences for
Mixed Usage

Threshold 

0.10

Mixed Usage 

6.7
5.9

Blooming 
 

10
0.0

Contrast 
 

7.0
5.4

Pre Calibration 
 

6.0
8.3

Reflections 
 

7.5
5.8

SDR Brightness 
 

5.1
6.1

Lighting Zone Transitions 
 

10
0.0

Black Uniformity 
 

7.3
9.0

Full Comparison

Brightness

HDR Brightness 
 

5.1
5.0

HDR Hallway Photo  

TCL S4/S450G HDR Hallway Photo
TCL Q651G HDR Hallway Photo

HDR Cityscape Photo  

TCL S4/S450G HDR Cityscape Photo
TCL Q651G HDR Cityscape Photo

HDR Landscape Photo  

TCL S4/S450G HDR Landscape Photo
TCL Q651G HDR Landscape Photo

Hallway Lights (~1950 cd/m²) 
 

211 cd/m²
367 cd/m²

Yellow Skyscraper (~700 cd/m²) 
 

194 cd/m²
291 cd/m²

Landscape Pool (~300 cd/m²) 
 

133 cd/m²
170 cd/m²

Peak 2% Window 
 

248 cd/m²
368 cd/m²

Peak 10% Window 
 

250 cd/m²
367 cd/m²

Peak 25% Window 
 

250 cd/m²
368 cd/m²

Peak 50% Window 
 

250 cd/m²
367 cd/m²

Peak 100% Window 
 

250 cd/m²
367 cd/m²

Sustained 2% Window 
 

248 cd/m²
367 cd/m²

Sustained 10% Window 
 

250 cd/m²
367 cd/m²

Sustained 25% Window 
 

250 cd/m²
367 cd/m²

Sustained 50% Window 
 

250 cd/m²
367 cd/m²

Sustained 100% Window 
 

250 cd/m²
366 cd/m²

Automatic Brightness Limiting (ABL) 
 

0.001
0.000
Show Text 

HDR Brightness In Game Mode 
 

5.1
5.0

HDR Hallway Photo  

TCL S4/S450G HDR Hallway Photo
TCL Q651G HDR Hallway Photo

HDR Cityscape Photo  

TCL S4/S450G HDR Cityscape Photo
TCL Q651G HDR Cityscape Photo

HDR Landscape Photo  

TCL S4/S450G HDR Landscape Photo
TCL Q651G HDR Landscape Photo

Hallway Lights (~1950 cd/m²) 
 

216 cd/m²
367 cd/m²

Yellow Skyscraper (~700 cd/m²) 
 

185 cd/m²
289 cd/m²

Landscape Pool (~300 cd/m²) 
 

141 cd/m²
168 cd/m²

Peak 2% Window 
 

251 cd/m²
373 cd/m²

Peak 10% Window 
 

253 cd/m²
371 cd/m²

Peak 25% Window 
 

253 cd/m²
370 cd/m²

Peak 50% Window 
 

253 cd/m²
369 cd/m²

Peak 100% Window 
 

253 cd/m²
368 cd/m²

Sustained 2% Window 
 

251 cd/m²
371 cd/m²

Sustained 10% Window 
 

253 cd/m²
370 cd/m²

Sustained 25% Window 
 

253 cd/m²
369 cd/m²

Sustained 50% Window 
 

253 cd/m²
368 cd/m²

Sustained 100% Window 
 

253 cd/m²
367 cd/m²

Automatic Brightness Limiting (ABL) 
 

0.001
0.001
Show Text 

SDR Brightness 
 

5.1
6.1

Real Scene Peak Brightness 
 

177 cd/m²
350 cd/m²

Peak 2% Window 
 

248 cd/m²
374 cd/m²

Peak 10% Window 
 

246 cd/m²
372 cd/m²

Peak 25% Window 
 

245 cd/m²
371 cd/m²

Peak 50% Window 
 

244 cd/m²
370 cd/m²

Peak 100% Window 
 

244 cd/m²
370 cd/m²

Sustained 2% Window 
 

247 cd/m²
372 cd/m²

Sustained 10% Window 
 

245 cd/m²
371 cd/m²

Sustained 25% Window 
 

245 cd/m²
370 cd/m²

Sustained 50% Window 
 

244 cd/m²
369 cd/m²

Sustained 100% Window 
 

244 cd/m²
369 cd/m²

Automatic Brightness Limiting (ABL) 
 

0.001
0.001
Show Text 
Picture Quality

Contrast 
 

7.0
5.4

Contrast Picture  

TCL S4/S450G Contrast Picture
TCL Q651G Contrast Picture

Contrast 
 

8,300 : 1
6,647 : 1

Native Contrast 
 

8,300 : 1
6,647 : 1
Show Text 

Blooming 
 

10
0.0

Blooming Photo  

TCL S4/S450G Blooming Photo
TCL Q651G Blooming Photo
Show Text 

Lighting Zone Transitions 
 

10
0.0

Preferred LD Video, Moving Object  

Local Dimming 
 

No
No

Backlight 
 

Direct
Direct

Dimming Zones Count Of Tested TV 
 

N/A
N/A
Show Text 

Contrast And Dark Details In Game Mode 
 

7.5
4.5

Blooming Photo In Game Mode  

TCL S4/S450G Blooming Photo In Game Mode
TCL Q651G Blooming Photo In Game Mode

Preferred LD Video, Moving Object In Game Mode  

Game Transitions With VRR And Preferred LD  

Show Text 

HDR Brightness 
 

5.1
5.0

HDR Hallway Photo  

TCL S4/S450G HDR Hallway Photo
TCL Q651G HDR Hallway Photo

HDR Cityscape Photo  

TCL S4/S450G HDR Cityscape Photo
TCL Q651G HDR Cityscape Photo

HDR Landscape Photo  

TCL S4/S450G HDR Landscape Photo
TCL Q651G HDR Landscape Photo

Hallway Lights (~1950 cd/m²) 
 

211 cd/m²
367 cd/m²

Yellow Skyscraper (~700 cd/m²) 
 

194 cd/m²
291 cd/m²

Landscape Pool (~300 cd/m²) 
 

133 cd/m²
170 cd/m²

Peak 2% Window 
 

248 cd/m²
368 cd/m²

Peak 10% Window 
 

250 cd/m²
367 cd/m²

Peak 25% Window 
 

250 cd/m²
368 cd/m²

Peak 50% Window 
 

250 cd/m²
367 cd/m²

Peak 100% Window 
 

250 cd/m²
367 cd/m²

Sustained 2% Window 
 

248 cd/m²
367 cd/m²

Sustained 10% Window 
 

250 cd/m²
367 cd/m²

Sustained 25% Window 
 

250 cd/m²
367 cd/m²

Sustained 50% Window 
 

250 cd/m²
367 cd/m²

Sustained 100% Window 
 

250 cd/m²
366 cd/m²

Automatic Brightness Limiting (ABL) 
 

0.001
0.000
Show Text 

HDR Brightness In Game Mode 
 

5.1
5.0

HDR Hallway Photo  

TCL S4/S450G HDR Hallway Photo
TCL Q651G HDR Hallway Photo

HDR Cityscape Photo  

TCL S4/S450G HDR Cityscape Photo
TCL Q651G HDR Cityscape Photo

HDR Landscape Photo  

TCL S4/S450G HDR Landscape Photo
TCL Q651G HDR Landscape Photo

Hallway Lights (~1950 cd/m²) 
 

216 cd/m²
367 cd/m²

Yellow Skyscraper (~700 cd/m²) 
 

185 cd/m²
289 cd/m²

Landscape Pool (~300 cd/m²) 
 

141 cd/m²
168 cd/m²

Peak 2% Window 
 

251 cd/m²
373 cd/m²

Peak 10% Window 
 

253 cd/m²
371 cd/m²

Peak 25% Window 
 

253 cd/m²
370 cd/m²

Peak 50% Window 
 

253 cd/m²
369 cd/m²

Peak 100% Window 
 

253 cd/m²
368 cd/m²

Sustained 2% Window 
 

251 cd/m²
371 cd/m²

Sustained 10% Window 
 

253 cd/m²
370 cd/m²

Sustained 25% Window 
 

253 cd/m²
369 cd/m²

Sustained 50% Window 
 

253 cd/m²
368 cd/m²

Sustained 100% Window 
 

253 cd/m²
367 cd/m²

Automatic Brightness Limiting (ABL) 
 

0.001
0.001
Show Text 

PQ EOTF Tracking 
 

8.2
5.6

PQ EOTF Graph  

See details
See details

600 Nit Tracking Delta 
 

0.0116
0.0139

1000 Nit Tracking Delta 
 

0.0115
0.0139

4000 Nit Tracking Delta 
 

0.0114
0.0139
Show Text 

SDR Brightness 
 

5.1
6.1

Real Scene Peak Brightness 
 

177 cd/m²
350 cd/m²

Peak 2% Window 
 

248 cd/m²
374 cd/m²

Peak 10% Window 
 

246 cd/m²
372 cd/m²

Peak 25% Window 
 

245 cd/m²
371 cd/m²

Peak 50% Window 
 

244 cd/m²
370 cd/m²

Peak 100% Window 
 

244 cd/m²
370 cd/m²

Sustained 2% Window 
 

247 cd/m²
372 cd/m²

Sustained 10% Window 
 

245 cd/m²
371 cd/m²

Sustained 25% Window 
 

245 cd/m²
370 cd/m²

Sustained 50% Window 
 

244 cd/m²
369 cd/m²

Sustained 100% Window 
 

244 cd/m²
369 cd/m²

Automatic Brightness Limiting (ABL) 
 

0.001
0.001
Show Text 

Color Gamut 
 

6.8

Wide Color Gamut 
 

No

Color Gamut DCI-P3 Picture  

TCL S4/S450G Color Gamut DCI-P3 Picture

DCI P3 xy 
 

74.50%

DCI P3 uv 
 

81.52%

Color Gamut Rec.2020 Picture  

TCL S4/S450G Color Gamut Rec.2020 Picture

Rec 2020 xy 
 

53.81%

Rec 2020 uv 
 

60.58%
Show Text 

Color Volume 
 

5.9
6.3

P3 Color Volume ITP Picture  

TCL S4/S450G P3 Color Volume ITP Picture
TCL Q651G P3 Color Volume ITP Picture

1,000 cd/m² DCI P3 Coverage ITP 
 

42.4%
58.3%

2020 Color Volume ITP Picture  

TCL S4/S450G 2020 Color Volume ITP Picture
TCL Q651G 2020 Color Volume ITP Picture

10,000 cd/m² Rec 2020 Coverage ITP 
 

18.4%
26.3%

White Luminance 
 

248 cd/m²
367 cd/m²

Red Luminance 
 

50 cd/m²
77 cd/m²

Green Luminance 
 

187 cd/m²
263 cd/m²

Blue Luminance 
 

19 cd/m²
26 cd/m²

Cyan Luminance 
 

201 cd/m²
289 cd/m²

Magenta Luminance 
 

63 cd/m²
103 cd/m²

Yellow Luminance 
 

228 cd/m²
339 cd/m²
Show Text 

Pre Calibration 
 

6.0
8.3

Pre White Balance Picture  

TCL S4/S450G Pre White Balance Picture
TCL Q651G Pre White Balance Picture

Pre Gamma Curve Picture  

TCL S4/S450G Pre Gamma Curve Picture
TCL Q651G Pre Gamma Curve Picture

Pre Color Picture  

TCL S4/S450G Pre Color Picture
TCL Q651G Pre Color Picture

White Balance dE 
 

4.56
3.31

Color dE 
 

3.41
1.96

Gamma 
 

2.17
2.25

Color Temperature 
 

7,612 K
6,473 K

Picture Mode 
 

Movie
Movie

Color Temp Setting 
 

Warm
Warm -5

Gamma Setting 
 

2.2
2.2
Show Text 

Post Calibration 
 

9.2
9.4

Post White Balance Picture  

TCL S4/S450G Post White Balance Picture
TCL Q651G Post White Balance Picture

Post Gamma Curve Picture  

TCL S4/S450G Post Gamma Curve Picture
TCL Q651G Post Gamma Curve Picture

Post Color Picture  

TCL S4/S450G Post Color Picture
TCL Q651G Post Color Picture

White Balance dE 
 

1.21
0.45

Color dE 
 

0.99
1.26

Gamma 
 

2.18
2.15

Color Temperature 
 

6,618 K
6,501 K

White Balance Calibration 
 

20 point
20 point

Color Calibration 
 

Yes
Yes
Show Text 

Gray Uniformity 
 

7.2
5.6

50% Uniformity Picture  

TCL S4/S450G 50% Uniformity Picture
TCL Q651G 50% Uniformity Picture

50% Std. Dev. 
 

3.123%
5.450%

50% DSE 
 

0.213%
0.208%

5% Uniformity Picture  

TCL S4/S450G 5% Uniformity Picture
TCL Q651G 5% Uniformity Picture

5% Std. Dev. 
 

0.843%
0.575%

5% DSE 
 

0.091%
0.106%
Show Text 

Black Uniformity 
 

7.3
9.0

Black Uniformity Picture With Preferred Local Dimming  

TCL S4/S450G Black Uniformity Picture With Preferred Local Dimming
TCL Q651G Black Uniformity Picture With Preferred Local Dimming

Std. Dev. 
 

N/A
N/A

Native Black Uniformity Picture  

TCL S4/S450G Native Black Uniformity Picture
TCL Q651G Native Black Uniformity Picture

Native Std. Dev. 
 

1.102%
0.419%
Show Text 

Viewing Angle 
 

4.9
6.4

Viewing Angle Video  

Chroma Graph  

TCL S4/S450G Chroma Graph
TCL Q651G Chroma Graph

Color Washout 
 

22°
26°

Hue Graph  

TCL S4/S450G Hue Graph
TCL Q651G Hue Graph

Color Shift 
 

18°
34°

Lightness Graph  

TCL S4/S450G Lightness Graph
TCL Q651G Lightness Graph

Brightness Loss 
 

31°
29°

Black Level Raise 
 

14°
21°

Gamma Shift 
 

13°
20°
Show Text 

Reflections 
 

7.5
5.8

Reflections Picture  

TCL S4/S450G Reflections Picture

Average Room Off Picture  

TCL S4/S450G Average Room Off Picture

Bright Room Off Picture  

TCL S4/S450G Bright Room Off Picture
TCL Q651G Bright Room Off Picture

Screen Finish 
 

Semi-gloss
Glossy

Total Reflections 
 

5.1%

Indirect Reflections 
 

0.5%

Calculated Direct Reflections 
 

4.6%
Show Text 

HDR Native Gradient 
 

6.5
7.0

HDR Gradient Picture  

TCL S4/S450G HDR Gradient Picture
TCL Q651G HDR Gradient Picture

100% Black to 50% Gray  

4.0
4.0

50% Gray to 100% White  

6.0
8.0

100% Black to 50% Red  

6.0
6.0

50% Red to 100% Red  

10
8.0

100% Black to 50% Green  

6.0
6.0

50% Green to 100% Green  

6.0
8.0

100% Black to 50% Blue  

6.0
8.0

50% Blue to 100% Blue  

8.0
8.0
Show Text 

Low-Quality Content Smoothing 
 

6.0
6.0

Low-Quality Content Smoothing Picture  

TCL S4/S450G Low-Quality Content Smoothing Picture
TCL Q651G Low-Quality Content Smoothing Picture

Smoothing 
 

6.0
5.5

Detail Preservation 
 

6.0
7.0
Show Text 

Upscaling: Sharpness Processing 
 

6.0
5.5

Sharpness Picture - 480p  

TCL S4/S450G Sharpness Picture - 480p
TCL Q651G Sharpness Picture - 480p
Show Text 

Pixels 
 

Pixels Picture  

TCL S4/S450G Pixels Picture
TCL Q651G Pixels Picture

Subpixel Layout 
 

BGR
BGR

Type  

LED
LED

Sub-Type 
 

VA
VA
Show Text 
Black Level

Contrast 
 

7.0
5.4

Contrast Picture  

TCL S4/S450G Contrast Picture
TCL Q651G Contrast Picture

Contrast 
 

8,300 : 1
6,647 : 1

Native Contrast 
 

8,300 : 1
6,647 : 1
Show Text 

Lighting Zone Precision 
 

10
0.0

Lighting Zone Precision Picture  

TCL S4/S450G Lighting Zone Precision Picture
TCL Q651G Lighting Zone Precision Picture
Show Text 

Lighting Zone Transitions 
 

10
0.0

Preferred LD Video, Moving Object  

Local Dimming 
 

No
No

Backlight 
 

Direct
Direct

Dimming Zone Count Of The Tested TV 
 

N/A
N/A
Show Text 

Contrast And Dark Details In Game Mode 
 

7.5
4.5

Lighting Zone Precision Photo In Game Mode  

TCL S4/S450G Lighting Zone Precision Photo In Game Mode
TCL Q651G Lighting Zone Precision Photo In Game Mode

Preferred LD Video, Moving Object In Game Mode  

Game Transitions With VRR And Preferred LD  

Show Text 

Black Uniformity 
 

7.3
9.0

Black Uniformity Picture With Preferred Local Dimming  

TCL S4/S450G Black Uniformity Picture With Preferred Local Dimming
TCL Q651G Black Uniformity Picture With Preferred Local Dimming

Std. Dev. 
 

N/A
N/A

Native Black Uniformity Picture  

TCL S4/S450G Native Black Uniformity Picture
TCL Q651G Native Black Uniformity Picture

Native Std. Dev. 
 

1.102%
0.419%
Show Text 
Motion

Response Time 
 

6.5
4.9

Motion Blur Picture  

TCL S4/S450G Motion Blur Picture
TCL Q651G Motion Blur Picture

Response Time Chart  

TCL S4/S450G Response Time Chart

80% Response Time 
 

7.5 ms

100% Response Time 
 

16.3 ms
Show Text 

Flicker-Free 
 

2.1
0.0

Backlight chart 
 

TCL S4/S450G Backlight chart
TCL Q651G Backlight chart

Flicker-Free 
 

No
No

PWM Dimming Frequency 
 

150 Hz
150 Hz
Show Text 

Black Frame Insertion (BFI) 
 

BFI Picture  

TCL S4/S450G BFI Picture
TCL Q651G BFI Picture

BFI Frequency Picture  

TCL S4/S450G BFI Frequency Picture
TCL Q651G BFI Frequency Picture

Optional BFI 
 

No
No

Min Flicker For 60 fps 
 

150 Hz
150 Hz

60Hz For 60 fps 
 

No
No

120Hz For 120 fps 
 

N/A
No

Min Flicker for 60 fps in Game Mode 
 

150 Hz
150 Hz
Show Text 

Motion Interpolation 
 

Motion Interpolation (30 fps) Picture  

TCL S4/S450G Motion Interpolation (30 fps) Picture
TCL Q651G Motion Interpolation (30 fps) Picture

Motion Interpolation (30 fps) 
 

Yes
Yes

Motion Interpolation (60 fps) Picture  

TCL S4/S450G Motion Interpolation (60 fps) Picture
TCL Q651G Motion Interpolation (60 fps) Picture

Motion Interpolation (60 fps) 
 

No
No
Show Text 

Stutter 
 

7.9
8.8

Frame Hold Time @ 24 fps 
 

25.4 ms
15.9 ms

Frame Hold Time @ 60 fps 
 

0.4 ms
0.0 ms
Show Text 

24p Judder 
 

7.8
10

Judder-Free 24p 
 

Yes
Yes

Judder-Free 24p via 60p 
 

No
Yes

Judder-Free 24p via 60i 
 

No
Yes

Judder-Free 24p via Native Apps 
 

Yes
Yes
Show Text 

Variable Refresh Rate 
 

0.0
6.4

Native Refresh Rate 
 

60 Hz
60Hz

Variable Refresh Rate 
 

No
Yes

HDMI Forum VRR 
 

No
Yes

FreeSync 
 

No
Yes

G-SYNC Compatible 
 

No
Yes

4k VRR Maximum 
 

N/A
60 Hz

4k VRR Minimum 
 

No VRR support
48 Hz

1080p VRR Maximum 
 

N/A
120 Hz

1080p VRR Minimum 
 

No VRR support
< 20 Hz

1440p VRR Maximum 
 

N/A

1440p VRR Minimum 
 

No VRR support

VRR + Local Dimming  

No Local Dimming
No Local Dimming
Show Text 
Color

SDR Color Volume 
 

6.6

DCI-P3 Gamut Rings  

TCL Q651G DCI-P3 Gamut Rings

CIELAB DCI-P3 Coverage 
 

83.01%

BT.2020 Gamut Rings  

TCL Q651G BT.2020 Gamut Rings

CIELAB BT.2020 Coverage 
 

56.48%
Show Text 

HDR Color Volume 
 

5.9
6.3

P3 Color Volume ITP Picture  

TCL S4/S450G P3 Color Volume ITP Picture
TCL Q651G P3 Color Volume ITP Picture

1,000 cd/m² DCI P3 Coverage ITP 
 

42.4%
58.3%

2020 Color Volume ITP Picture  

TCL S4/S450G 2020 Color Volume ITP Picture
TCL Q651G 2020 Color Volume ITP Picture

10,000 cd/m² BT.2020 Coverage ITP 
 

18.4%
26.3%

White Luminance 
 

248 cd/m²
367 cd/m²

Red Luminance 
 

50 cd/m²
77 cd/m²

Green Luminance 
 

187 cd/m²
263 cd/m²

Blue Luminance 
 

19 cd/m²
26 cd/m²

Cyan Luminance 
 

201 cd/m²
289 cd/m²

Magenta Luminance 
 

63 cd/m²
103 cd/m²

Yellow Luminance 
 

228 cd/m²
339 cd/m²
Show Text 

SDR Pre-Calibration Color Accuracy 
 

6.0
8.3

Pre White Balance Picture  

TCL S4/S450G Pre White Balance Picture
TCL Q651G Pre White Balance Picture

Pre Gamma Curve Picture  

TCL S4/S450G Pre Gamma Curve Picture
TCL Q651G Pre Gamma Curve Picture

Pre Color Picture  

TCL S4/S450G Pre Color Picture
TCL Q651G Pre Color Picture

White Balance dE 2000 
 

4.56
3.31

Color dE 2000 
 

3.41
1.96

Gamma 
 

2.17
2.25

Color Temperature 
 

7,612 K
6,473 K

Picture Mode 
 

Movie
Movie

Color Temp Setting 
 

Warm
Warm -5

Gamma Setting 
 

2.2
2.2
Show Text 

SDR Post-Calibration Color Accuracy 
 

9.2
9.4

Post White Balance Picture  

TCL S4/S450G Post White Balance Picture
TCL Q651G Post White Balance Picture

Post Gamma Curve Picture  

TCL S4/S450G Post Gamma Curve Picture
TCL Q651G Post Gamma Curve Picture

Post Color Picture  

TCL S4/S450G Post Color Picture
TCL Q651G Post Color Picture

White Balance dE 2000 
 

1.21
0.45

Color dE 2000 
 

0.99
1.26

Gamma 
 

2.18
2.15

Color Temperature 
 

6,618 K
6,501 K

White Balance Calibration 
 

20 point
20 point

Color Calibration 
 

Yes
Yes
Show Text 

HDR Pre-Calibration Color Accuracy 
 

5.9

HDR Pre White Balance Picture  

TCL Q651G HDR Pre White Balance Picture

HDR Pre Color Picture  

TCL Q651G HDR Pre Color Picture

White Balance dE ITP 
 

13.19

Color dE ITP 
 

11.2

Color Temperature 
 

7,633 K

Picture Mode 
 

Movie
Show Text 

HDR Post-Calibration Color Accuracy 
 

7.2

HDR Post White Balance Picture  

TCL Q651G HDR Post White Balance Picture

HDR Post Color Picture  

TCL Q651G HDR Post Color Picture

White Balance dE ITP 
 

10.66

Color dE ITP 
 

9.80

Color Temperature 
 

6,804 K
Show Text 
Processing

PQ EOTF Tracking 
 

8.2
5.6

PQ EOTF Graph  

See details
See details

600 Nit Tracking Delta 
 

0.0116
0.0139

1000 Nit Tracking Delta 
 

0.0115
0.0139

4000 Nit Tracking Delta 
 

0.0114
0.0139
Show Text 

Low-Quality Content Smoothing 
 

6.0
6.0

Low-Quality Content Smoothing Picture  

TCL S4/S450G Low-Quality Content Smoothing Picture
TCL Q651G Low-Quality Content Smoothing Picture

Smoothing 
 

6.0
5.5

Detail Preservation 
 

6.0
7.0
Show Text 

Upscaling: Sharpness Processing 
 

6.0
5.5

Sharpness Picture - 480p  

TCL S4/S450G Sharpness Picture - 480p
TCL Q651G Sharpness Picture - 480p
Show Text 

HDR Native Gradient 
 

6.5
7.0

HDR Gradient Picture  

TCL S4/S450G HDR Gradient Picture
TCL Q651G HDR Gradient Picture

100% Black To 50% Gray  

4.0
4.0

50% Gray To 100% White  

6.0
8.0

100% Black To 50% Red  

6.0
6.0

50% Red To 100% Red  

10
8.0

100% Black To 50% Green  

6.0
6.0

50% Green To 100% Green  

6.0
8.0

100% Black To 50% Blue  

6.0
8.0

50% Blue To 100% Blue  

8.0
8.0
Show Text 
Game Mode Responsiveness

Input Lag 
 

9.7
8.3

1080p @ 60Hz 
 

11.2 ms
10.4 ms

1080p @ 60Hz Outside Game Mode 
 

112.1 ms
161.4 ms

1080p @ 120Hz 
 

N/A
6.2 ms

1080p @ Max Refresh Rate 
 

N/A
6.2 ms

4k @ 60Hz 
 

10.7 ms
10.2 ms

4k @ 60Hz @ 4:4:4 
 

10.8 ms
10.7 ms

4k @ 60Hz Outside Game Mode 
 

93.9 ms
160.6 ms

4k @ 60Hz With Interpolation 
 

95.1 ms
160.6 ms

4k @ 120Hz 
 

N/A
N/A

4k @ Max Refresh Rate 
 

N/A
10.2 ms

8k @ 60Hz 
 

N/A
N/A
Show Text 

Supported Resolutions 
 

7.1
7.2

Resolution  

4k
4k

480p @ 59.94Hz (Widescreen) 
 

Yes
Yes

720p @ 59.94Hz 
 

Yes
Yes

1080p @ 60Hz @ 4:4:4 
 

Yes
Yes

1080p @ 120Hz 
 

No
Yes

1080p Maximum Refresh Rate 
 

120 Hz

4k @ 60Hz 
 

Yes
Yes

4k @ 60Hz @ 4:4:4 
 

Yes
Yes

4k @ 120Hz 
 

No
No

4k @ 120Hz @ 4:4:4 
 

No
No

4k Maximum Refresh Rate 
 

60 Hz

8k @ 30Hz Or 24Hz 
 

No
No

8k @ 60Hz 
 

No
No
Show Text 

Variable Refresh Rate 
 

0.0
6.4

Native Refresh Rate 
 

60 Hz
60Hz

Variable Refresh Rate 
 

No
Yes

HDMI Forum VRR 
 

No
Yes

FreeSync 
 

No
Yes

G-SYNC Compatible 
 

No
Yes

4k VRR Maximum 
 

N/A
60 Hz

4k VRR Minimum 
 

No VRR support
48 Hz

1080p VRR Maximum 
 

N/A
120 Hz

1080p VRR Minimum 
 

No VRR support
< 20 Hz

VRR + Local Dimming  

No Local Dimming
No Local Dimming
Show Text 

CAD In Game Mode @ Max Refresh Rate 
 

2.2

Pursuit Photo Max Refresh  

TCL Q651G Pursuit Photo Max Refresh

CAD Heatmap Max Refresh 
 

TCL Q651G CAD Heatmap Max Refresh

Transition At Max Refresh 
 

transition-game-max-0-31
0 to 31

Avg. CAD 
 

590

Best 10% CAD 
 

188

Worst 10% CAD 
 

909
Show Text 

CAD In Game Mode @ 120Hz 
 

0.0

Pursuit Photo 120Hz  

TCL Q651G Pursuit Photo 120Hz

CAD Heatmap 120Hz  

TCL Q651G CAD Heatmap 120Hz

Transition At 120Hz 
 

Avg. CAD 
 

N/A

Best 10% CAD 
 

N/A

Worst 10% CAD 
 

N/A
Show Text 

CAD In Game Mode @ 60Hz 
 

2.2

Pursuit Photo 60Hz  

TCL Q651G Pursuit Photo 60Hz

CAD Heatmap 60Hz 
 

TCL Q651G CAD Heatmap 60Hz

Transition 60Hz 
 

transition-game-60-0-31
0 to 31

Avg. CAD 
 

590

Best 10% CAD 
 

188

Worst 10% CAD 
 

909
Show Text 

PS5 Compatibility 
 

PS5 Screenshot  

TCL S4/S450G PS5 Screenshot
TCL Q651G PS5 Screenshot

Auto Low Latency Mode (ALLM) 
 

Yes
Yes

4k @ 120Hz 
 

No
No

1440p @ 120Hz 
 

No
Yes

1080p @ 120Hz 
 

No
Yes

HDR 
 

Yes
Yes

VRR 
 

No
Yes
Show Text 

Xbox Series X|S Compatibility 
 

Xbox Series X Screenshot  

TCL S4/S450G Xbox Series X Screenshot
TCL Q651G Xbox Series X Screenshot

Auto Low Latency Mode (ALLM) 
 

Yes
Yes

4k @ 120Hz 
 

No
No

1440p @ 120Hz 
 

No
Yes

1080p @ 120Hz 
 

No
Yes

HDR 
 

Yes
Yes

VRR 
 

No
Yes
Show Text 
Motion Handling

Stutter 
 

7.9
8.8

Frame Hold Time @ 24 fps 
 

25.4 ms
15.9 ms

Frame Hold Time @ 60 fps 
 

0.4 ms
0.0 ms
Show Text 

24p Judder 
 

7.8
10

Judder-Free 24p 
 

Yes
Yes

Judder-Free 24p via 60p 
 

No
Yes

Judder-Free 24p via 60i 
 

No
Yes

Judder-Free 24p via Native Apps 
 

Yes
Yes
Show Text 

Response Time 
 

6.5
4.9

Pursuit Photo 60Hz  

TCL S4/S450G Pursuit Photo 60Hz
TCL Q651G Pursuit Photo 60Hz

Response Time Heatmap 60Hz 
 

TCL Q651G Response Time Heatmap 60Hz

Transition At 60Hz 
 

transition-60-0-31
0 to 31

First Response Time 
 

25.8 ms

Total Response Time 
 

7.0 ms

Worst 10% Response Time 
 

37.0 ms
Show Text 

Flicker 
 

Backlight chart 
 

TCL S4/S450G Backlight chart
TCL Q651G Backlight chart

Flicker-Free 
 

No
No

PWM Dimming Frequency 
 

150 Hz
150 Hz
Show Text 

Black Frame Insertion (BFI) 
 

BFI Picture  

TCL S4/S450G BFI Picture
TCL Q651G BFI Picture

BFI Frequency Picture  

TCL S4/S450G BFI Frequency Picture
TCL Q651G BFI Frequency Picture

Optional BFI 
 

No
No

Min Flicker For 60 fps 
 

150 Hz
150 Hz

60Hz For 60 fps 
 

No
No

120Hz For 120 fps 
 

N/A
No

Min Flicker For 60 fps In Game Mode 
 

150 Hz
150 Hz
Show Text 

Motion Interpolation 
 

Motion Interpolation (30 fps) Picture  

TCL S4/S450G Motion Interpolation (30 fps) Picture
TCL Q651G Motion Interpolation (30 fps) Picture

Motion Interpolation (30 fps) 
 

Yes
Yes

Motion Interpolation (60 fps) Picture  

TCL S4/S450G Motion Interpolation (60 fps) Picture
TCL Q651G Motion Interpolation (60 fps) Picture

Motion Interpolation (60 fps) 
 

No
No
Show Text 
Reflections

Direct Reflections 
 

7.5
5.8

Ring Light Picture  

TCL Q651G Ring Light Picture

Direct Reflections Graph  

See details

Peak Direct Reflection Intensity 
 

57.9%

Screen Finish 
 

Semi-gloss
Glossy
Show Text 

Ambient Black Level Raise 
 

9.0

Black Level Raise Picture  

TCL Q651G Black Level Raise Picture

Bright Room Black Level Raise Graph  

See details

Black Luminance @ 0 lx 
 

0.06 cd/m²

Black Luminance @ 1000 lx 
 

0.39 cd/m²
Show Text 

Total Reflected Light 
 

5.7

Bright Room Off Picture  

TCL S4/S450G Bright Room Off Picture
TCL Q651G Bright Room Off Picture

Ring Picture Total Reflection  

TCL Q651G Ring Picture Total Reflection

Total Reflected Light Intensity 
 

29,136% ⋅ pixel

Diffraction Artifacts 
 

Yes
Show Text 

Ambient Color Saturation 
 

6.8

Bright Room Color Volume Graph  

See details

Low-Luminance Colors @ 1000 lx 
 

59.32%

Mid-Luminance Colors @ 1000 lx 
 

56.66%

High-Luminance Colors @ 1000 lx 
 

45.53%
Show Text 
Panel

Viewing Angle 
 

4.9
6.4

Viewing Angle Video  

Chroma Graph  

TCL S4/S450G Chroma Graph
TCL Q651G Chroma Graph

Color Washout 
 

22°
26°

Hue Graph  

TCL S4/S450G Hue Graph
TCL Q651G Hue Graph

Color Shift 
 

18°
34°

Lightness Graph  

TCL S4/S450G Lightness Graph
TCL Q651G Lightness Graph

Brightness Loss 
 

31°
29°

Black Level Raise 
 

14°
21°

Gamma Shift 
 

13°
20°
Show Text 

Gray Uniformity 
 

7.2
5.6

50% Uniformity Picture  

TCL S4/S450G 50% Uniformity Picture
TCL Q651G 50% Uniformity Picture

50% Std. Dev. 
 

3.123%
5.450%

50% DSE 
 

0.213%
0.208%

5% Uniformity Picture  

TCL S4/S450G 5% Uniformity Picture
TCL Q651G 5% Uniformity Picture

5% Std. Dev. 
 

0.843%
0.575%

5% DSE 
 

0.091%
0.106%
Show Text 

Panel Technology 
 

Spectral Power Distribution  

TCL Q651G Spectral Power Distribution

Pixels Picture  

TCL S4/S450G Pixels Picture
TCL Q651G Pixels Picture

Type  

LED
LED

Sub-Type 
 

VA
VA

Subpixel Layout 
 

BGR
BGR
Show Text 
Inputs

Input Lag 
 

9.7
8.3

1080p @ 60Hz 
 

11.2 ms
10.4 ms

1080p @ 60Hz Outside Game Mode 
 

112.1 ms
161.4 ms

1080p @ 120Hz 
 

N/A
6.2 ms

1080p @ 144Hz 
 

N/A
6.2 ms

1440p @ 60Hz 
 

11.0 ms

1440p @ 120Hz 
 

N/A

1440p @ 144Hz 
 

N/A

4k @ 60Hz 
 

10.7 ms
10.2 ms

4k @ 60Hz + 10-Bit HDR 
 

10.7 ms

4k @ 60Hz @ 4:4:4 
 

10.8 ms
10.7 ms

4k @ 60Hz Outside Game Mode 
 

93.9 ms
160.6 ms

4k @ 60Hz With Interpolation 
 

95.1 ms
160.6 ms

4k @ 120Hz 
 

N/A
N/A

4k @ 144Hz 
 

N/A
10.2 ms

8k @ 60Hz 
 

N/A
N/A
Show Text 

Supported Resolutions 
 

7.1
7.2

Resolution  

4k
4k

480p @ 59.94Hz (Widescreen) 
 

Yes
Yes

720p @ 59.94Hz 
 

Yes
Yes

1080p @ 60Hz @ 4:4:4 
 

Yes
Yes

1080p @ 120Hz 
 

No
Yes

1080p @ 144Hz 
 

No

1440p @ 60Hz 
 

Yes

1440p @ 120Hz 
 

No

1440p @ 144Hz 
 

No

4k @ 60Hz 
 

Yes
Yes

4k @ 60Hz @ 4:4:4 
 

Yes
Yes

4k @ 120Hz 
 

No
No

4k @ 120Hz @ 4:4:4 
 

No
No

4k @ 144Hz 
 

No

8k @ 30Hz or 24Hz 
 

No
No

8k @ 60Hz 
 

No
No
Show Text 

PS5 Compatibility 
 

PS5 Screenshot  

TCL S4/S450G PS5 Screenshot
TCL Q651G PS5 Screenshot

Auto Low Latency Mode (ALLM) 
 

Yes
Yes

4k @ 120Hz 
 

No
No

1440p @ 120Hz 
 

No
Yes

1080p @ 120Hz 
 

No
Yes

HDR 
 

Yes
Yes

VRR 
 

No
Yes
Show Text 

Xbox Series X|S Compatibility 
 

Xbox Series X Screenshot  

TCL S4/S450G Xbox Series X Screenshot
TCL Q651G Xbox Series X Screenshot

Auto Low Latency Mode (ALLM) 
 

Yes
Yes

4k @ 120Hz 
 

No
No

1440p @ 120Hz 
 

No
Yes

1080p @ 120Hz 
 

No
Yes

HDR 
 

Yes
Yes

VRR 
 

No
Yes
Show Text 

Input Specifications  

Side Inputs Picture  

TCL S4/S450G Side Inputs Picture
TCL Q651G Side Inputs Picture

Rear Inputs Picture  

TCL S4/S450G Rear Inputs Picture
TCL Q651G Rear Inputs Picture

HDR10 
 

Yes
Yes

HDMI  

3
3 (3x HDMI 2.0)

HDR10+ 
 

No
Yes

Dolby Vision 
 

Yes
Yes

HDMI 2.1 Rated Speed 
 

No
No HDMI 2.1

HLG 
 

Yes
Yes

ATSC Tuner 
 

1.0
1.0

USB Ports  

1
1

HDMI 2.0 Full Bandwidth 
 

Yes (HDMI 1,2,3)

USB 3.0 
 

Yes (1)
No

Audio Out 3.5mm  

1
1

Wi-Fi  

Yes (2.4 GHz, 5 GHz)
Yes (2.4 GHz, 5 GHz)

Ethernet Speed  

1
100 Mbps

CEC  

Yes

Composite In  

1 (adapter required, not incl.)
1 (Adapter Required, Not Incl.)

HDCP 2.2  

Yes (HDMI 1,2,3)

Digital Optical Audio Out  

1
1

Variable Analog Audio Out  

Yes
Show Text 

Input Photos  

Side Inputs Picture  

TCL S4/S450G Side Inputs Picture
TCL Q651G Side Inputs Picture

Rear Inputs Picture  

TCL S4/S450G Rear Inputs Picture
TCL Q651G Rear Inputs Picture

Audio Passthrough 
 

ARC/eARC Port 
 

eARC
eARC

eARC: Dolby Atmos Over Dolby Digital Plus 
 

Yes
Yes

eARC: Dolby Digital Plus 7.1 
 

Yes
Yes

eARC: LPCM 7.1 Over Dolby MAT 
 

Yes
Yes

eARC: Dolby TrueHD 7.1 
 

Yes
Yes

eARC: DTS:X Over DTS-HD MA 
 

No
Yes

eARC: DTS-HD Master Audio 7.1 
 

No
Yes

eARC: LPCM Channels (Bitstream) 
 

2.0
7.1

ARC: Dolby Digital 5.1 
 

Yes
Yes

ARC: DTS 5.1 
 

Yes
Yes

Optical: Dolby Digital 5.1 
 

Yes
Yes

Optical: DTS 5.1 
 

Yes
Yes
Show Text 

Total Inputs  

HDMI  

3
3 (3x HDMI 2.0)

USB  

1
1

Digital Optical Audio Out  

1
1

Analog Audio Out 3.5mm  

1
1

Analog Audio Out RCA  

0

Component In  

0

Composite In  

1 (adapter required, not incl.)
1 (Adapter Required, Not Incl.)

Tuner (Cable/Ant)  

1

Ethernet  

1
100 Mbps

DisplayPort  

0

IR In  

0

HDR Format Support  

HDR10 
 

Yes
Yes

HDR10+ 
 

No
Yes

Dolby Vision 
 

Yes
Yes

HLG 
 

Yes
Yes
Design

Style  

Design Picture  

TCL S4/S450G Design Picture
TCL Q651G Design Picture

Curved  

No
No
Show Text 

Accelerated Longevity Test 
 

Uniformity Pictures  

Longevity Graph  

TCL S4/S450G Longevity Graph

Stand  

Stand Picture  

TCL S4/S450G Stand Picture
TCL Q651G Stand Picture
Show Text 

Back  

Back Picture  

TCL S4/S450G Back Picture
TCL Q651G Back Picture

Wall Mount  

VESA 200x200
VESA 400x400
Show Text 

Borders  

Borders Picture  

TCL S4/S450G Borders Picture
TCL Q651G Borders Picture

Borders  

0.31" (0.8 cm)
0.31" (0.8 cm)

Thickness  

Thickness Picture  

TCL S4/S450G Thickness Picture
TCL Q651G Thickness Picture

Max Thickness  

3.19" (8.1 cm)
2.83" (7.2 cm)

Build Quality 
 

6.0
7.0

Build quality picture  

TCL S4/S450G Build quality picture
TCL Q651G Build quality picture
Show Text 
Smart Features

Interface 
 

Smart TV Picture  

TCL S4/S450G Smart TV Picture
TCL Q651G Smart TV Picture

Smart OS  

Google TV
Google TV

Version  

11
12

Ease of Use 
 

Average

Smoothness 
 

Very Smooth

Time Taken to Select YouTube 
 

1 s

Time Taken to Change Backlight 
 

2 s

Advanced Options 
 

Many
Show Text 

Ad-Free 
 

0.0
0.0

Ads Picture  

TCL S4/S450G Ads Picture
TCL Q651G Ads Picture

Ads 
 

Yes
Yes

Opt-out 
 

No
No

Suggested Content in Home 
 

Yes
Yes

Opt-out of Suggested Content 
 

No
No
Show Text 

Apps and Features 
 

9.0

Apps Picture  

TCL S4/S450G Apps Picture

App Selection 
 

Great

App Smoothness 
 

Very Smooth

Cast Capable 
 

Yes

USB Drive Playback 
 

Yes

USB Drive HDR Playback 
 

Yes

HDR in Netflix 
 

Yes

HDR in YouTube 
 

Yes
Show Text 

Remote  

Remote Picture  

TCL S4/S450G Remote Picture
TCL Q651G Remote Picture

Size 
 

Medium

Voice Control  

Many Features
Yes

CEC Menu Control 
 

Yes

Other Smart Features 
 

No

Remote App  

Android TV
Show Text 

TV Controls  

Controls Picture  

TCL S4/S450G Controls Picture
TCL Q651G Controls Picture

Mute Switch 
 

No
Show Text 

In The Box  

In The Box Picture  

TCL S4/S450G In The Box Picture
TCL Q651G In The Box Picture
Show Text 

Misc  

Power Consumption  

37 W
52 W

Power Consumption (Max)  

78 W
191 W

Firmware  

V8-R51MT08-LF1V053.021057
V8-R75PT01-LF1V174.000660
Sound Quality

Frequency Response 
 

5.9
6.8

Frequency Response  

See details
See details

Low-Frequency Extension 
 

160.00 Hz
113.14 Hz

Std. Dev. @ 70 
 

4.56 dB
4.24 dB

Std. Dev. @ 80 
 

4.55 dB
4.26 dB

Std. Dev. @ Max 
 

5.24 dB
5.33 dB

Max 
 

89.8 dB SPL
95.0 dB SPL

Dynamic Range Compression 
 

3.24 dB
2.79 dB

Digital Room Correction  

No
Show Text 

Distortion 
 

6.8

Total Harmonic Distortion 
 

See details

Weighted THD @ 80 
 

0.067

Weighted THD @ Max 
 

0.658

IMD @ 80 
 

2.05%

IMD @ Max 
 

21.75%
Show Text 

TCL S4/S450G

TCL Q651G

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