The TV's 4:2:0 color support is inconsistent. 4:4:4 color is displayed properly in all picture modes. 4k 60 Hz is only supported when the HDMI input used is set to HDMI 2.0 in the TV's settings. Users can change this 'Gamma' setting to suit the brightness of their room. This test was done with the 'Gamma' set to '2.0' in the TV's advanced picture settings in the Roku app at the default 'Gamma' of '2.2' the EOTF was dimmer than the PQ curve, shown here, and shown here with 'Game Mode' enabled. The TV's EOTF follows the HDR PQ curve fairly closely until 50% stimulus grey, where it rolls off very early to ease the transition to the TV's low peak brightness. Most colors in HDR content will be at a dim stimulus and have decent accuracy, but very bright colors will have poor accuracy. These tests were done at 75% brightness stimulus shown here and here are tests done at a dimmer 50% stimulus that have much better accuracy. All other colors in the Rec 2020 picture, and all the P3 colors are shown horribly undersaturated, likely because the TV is prioritizing brightness over color accuracy because the TV is so dim. The true color gamut is shown by the maximum red, green and blue in the Rec 2020 gamut picture. Narrow color gamut, only good enough for SDR content. Update : TCL has also released a 75" version of the S425/423/421. We don't know if there are any differences. Update : TCL has released a 50" version of the S425. This is a gradual roll-out, so some areas may still sell the S405.
This appears to be similar to the P607 (visible in the pixels photo here) Size Update : We have received reports that the 49" model of the S405 (49S405) has a different panel, which displays a crosshatching like effect which is visible from up-close ( see here). The TCL S305 is essentially the same TV, but it features a 1080p or 720p resolution and can be found in smaller sizes. If someone comes across a different type of panel or if their TCL S405 (S-Series) doesn't correspond to our review, let us know and we will update the review. For the most part, we expect our review to be valid for the 49" (49S405), 55" (55S405) and 65" (65S405) versions.
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