We don’t know why this occurs, but it isn’t noticeable in person due to the extremely short duration. The W650D was tested on our 1.0 test bench, which doesn’t include the test for ‘Flicker-free’ which is on newer reviews. The goal of this flicker-free test is to identify any of these other sources of flicker (not necessarily PWM). If you’d like a TV which is completely flicker free, then look for flicker-free models on this page.

What do you mean by, “it isn’t noticeable”? Do you mean in the traditional sense that you can’t see flickering with the naked eye, do you mean that the flicker should cause no negative side effects or both? I’m hypersensitive to flicker and suffer from flicker whether it’s noticeable in the traditional sense or not. There are a lot of people like me. If you visit the site https://ledstrain.org/ you can get an idea. Sorry for going a bit off topic and thanks for the reply.

That’s correct - PWM dimming usually causes noticeable motion differences as it affects persistence blur. In the case of the W650D, this isn’t PWM dimming but another type of flicker which doesn’t cause this different motion. TVs on the latest 1.2 test bench (models from 2017 and 2018) now have a test for ‘Flicker-Free’ which is useful for those hypersensitive to flicker. On any table you can click ‘Add Column/Filter’ and select the ‘Flicker-Free’ item, and filter to ‘Yes’ for only those that are flicker free. At the moment we have only tested 3 TVs which are completely flicker free (the Sony X690E, X720E and X800E).