The SDR contrast was more reliable, as the TV produced a brightness of around 350 nits with black levels as low as 0.025 nit. Onn also claims 500-nit HDR brightness for this TV, but during testing I measured HDR peaks closer to the low 400s, coupled with black levels that were overly bright on occasion. In our tests, the local-dimming algorithm occasionally got confused, especially with varying shades of gray on the screen (such as when we were searching in the built-in YouTube app), which led to some visible shifting of black levels. Walmart’s in-house Onn brand released a frameless Roku TV, and although the Onn QLED Roku TV is priced competitively against our top picks, it has some flaws that keep it from going the distance.
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