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TCL S405 series Roku TV (2017) review: The best smart TV system in an affordable 4K TV

TCL S405 series
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Sarah Tew/CNET
TCL S405 series
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Sarah Tew/CNET

Around back there's an ample selection of jacks:

  • HDMI inputs (HDMI 2.0a and HDCP 2.2)
  • 1 analog (composite) video input
  • 1 USB port (2.0)
  • Ethernet (wired internet)
  • 1 headphone jack
  • 1 optical digital audio output
  • 1 RF (antenna) input

The HDMI are state-of-the-art and worked fine with everything I threw at them, including 4K Blu-ray. The headphone jack is a nice touch, and unlike cheaper Roku sets, this one has Ethernet, too.

Picture quality: "Good enough"


If you're not a critical viewer, you probably won't have any complaints about the S405's picture. But if you want good black levels and contrast, especially in a dark room on movie night, this isn't the TV for you. 

In my side-by-side comparison it couldn't match the overall image quality of Vizio's D and E series, and also fell short of the Amazon-powered Element Fire TV -- even though the most of those sets lack HDR capability. Color accuracy was good and video processing fine, and it could even get a bit brighter than the Vizios, but those lighter blacks spoiled the deal.

Click the image at the right to see the picture settings used in the review and to read more about how this TV's picture controls worked during calibration.

Dim lighting: Among the budget TVs in my lineup the 55S405 performed the worst in a dark home theater environment. Its black levels were visibly worse than the smaller Vizios and the Element Fire TV, and significantly worse than the local-dimming equipped TCL P series and 65-inch Vizios.

The difference was most visible in extremely dark scenes, like the attack on Hogwarts in "Harry Potter and the Deathly Hallows, Part 2." Black areas, shadows and letterbox bars looked washed-out and bright, robbing the scene of the impact see on the other sets. The other non-dimming TVs weren't that much better, and their advantage might be lost outside of a side-by-side comparison, but it was obvious in my lineup.

Shadow detail was OK on the S405, but still relatively murky, especially with the elevated black levels. Highlights were brighter than on the 50-inch Vizio D series, but that TV still looked better overall.

Bright lighting: The TCL fared a bit better than the Vizios in a bright room, with higher peak light output in its brightest setting, although it didn't quite match the Element. I especially liked the ability to quickly tailor the most accurate picture mode -- Movie -- with one of five brightness settings, although in that mode it didn't beat the Vizios. In any case all of the TVs I tested are plenty bright for most rooms.

The S405's matte screen finish did a good job reducing reflections, but not any better than the others.

Light output in nits

TV Mode (SDR) 10% window (SDR) Full screen (SDR) Mode (HDR) 10% window (HDR)
Vizio M65-D0 Calibrated 456 450 Vivid 507
TCL 55P607 Vivid/dimming off 438 431 Brighter/Dark HDR 448
Element EL4KAMZ5517 Standard 363 368 N/A
TCL 55S405 Brighter/Vivid 301 298 Brighter/Bright HDR 306
Vizio E65-E0 Vivid/dimming off 289 287 Vivid/dimming off 288
Vizio D65-E0 Vivid/dimming off 260 260 N/A
Vizio D50-E1 Vivid 250 304 N/A
Vizio E50-E1 Calibrated 223 226 N/A

Color accuracy: Prior to calibration the Movie mode was very accurate, surpassing any of the other review samples aside from the larger Vizios in this category. Afterwards it was excellent. My main complaint is that near-black areas were washed with a bluish tinge, a typical issue with LCD sets that have poor black levels.

Video processing: The TCL performed as expected in my motion tests, delivering correct 1080p/24 cadence with film-based sources and the motion resolution of a 60Hz TV, despite TCL's "120Hz effective" claim. Such claims are typically hogwash, and the S405 is no exception.

In game mode, however, it delivered one of the best results I've ever seen, similar to the TCL P series at around 15ms of input lag.

Uniformity: The S405 I reviewed was among the worst in the lineup at maintaining a solid image across the screen. The edges were brighter than the rest, and in full-field uniformity patterns there were slight blotches, especially in dim areas. Watching hockey showed the brightness variations as well, although it wasn't terrible. From off-angle it lost color and black level fidelity as quickly as any of the others, and worse than the P series and the larger Vizios.

HDR and 4K video: The S405 is one of the least expensive TVs that can handle HDR, and it looked it in my tests. I watched "The Fifth Element" on Blu-ray and while the TCL's image was marginally better (mainly due to the wider color gamut) on the 4K HDR disc than the standard 1080p disc, it would be tough to tell the two apart outside of a side-by-side lineup. The S405's HDR image lacked the punch of the P series and the deep blacks of the Vizio E65, and color was less saturated and vibrant than on either one.

The story was the same with 4K HDR streaming from Netflix and Amazon: tough to see any improvement compared with standard 1080p, with an image that showed the same issues I saw with standard material. That said, the S405 was able to pass the full resolution of 4K from YouTube and played through a suite of 4K test patterns from Florian Friedrich with no problems.

Geek box

Test Result Score
Black luminance (0%) 0.0377 Average
Peak white luminance (100%) 301 Average
Avg. gamma (10-100%) 2.32 Good
Avg. grayscale error (10-100%) 0.397 Good
Dark gray error (20%) 0.149 Good
Bright gray error (70%) 0.762 Good
Avg. color error 2.008 Good
Red error 2.047 Good
Green error 1.614 Good
Blue error 4.082 Average
Cyan error 1.461 Good
Magenta error 1.253 Good
Yellow error 1.59 Good
Avg. saturations error 1.47 Good
Avg. luminance error 2.26 Good
Avg. color checker error 1 Good
1080p/24 Cadence (IAL) Pass Good
Motion resolution (max) 300 Poor
Motion resolution (dejudder off) 300 Poor
Input lag (Game mode) 15.4 Good

HDR default

Black luminance 0.0411 Average
Peak white luminance (10% win) 306 Poor
Gamut % DCI/P3 (CIE 1976) 81.5 Poor
Avg. saturations error 7.4 Poor
Avg. color checker error 4 Average

TCL 55S405 CNET review calibration results by David Katzmaier on Scribd

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