Lately I’ve noticed that on 4k hdr files (which look great now), after a while in playback they “go dim”. It can be instantly fixed by bringing up the menu, sometimes it takes a while to notice though because it’s not unwatchablely dim. Wondering if I’m alone, I did notice “adjust refresh rate” was set to “start/stop”, I’ve set that to always see see if it helps.
Edit: Unfortunately I’m not sure if this is new behavior as of Oct.
Please note that I couldn’t download the latest firmware directly from the TV (reported as not available). If you can’t wait you’ll have to follow the manual flash procedure and download the firmware yourself.
I have the European model and in the end I located the latest release on the LG site for Morocco: https://www.lg.com/ma . As always, manually flashing the wrong firmware can brick/damage your TV so it’s best to wait for the autoupdater if you’re not comfortable doing this.
No, this has nothing to do with the 2018-model dimming issues, they have some sort of delay for luminance when doing the tone mapping. What you have is sort of a broken implementation of the auto-dimming feature in the 2017 models. It has nothing to do with the Vero and can also be seen on Netflix etc. (it’s especially noticable on HDR content).
Basically, the auto-dimming is supposed to dim the screen when you have static content. The way the feature is implemented though is that it doesn’t actually check if the image is static but if a certain contrast threshold value over the entire frame has not changed in a while. So if you watch very dark scenes that go on for several minutes, the TV will think “it’s a static image, better turn auto-dimming on”.
The only way to disable this auto-dimming is through the service menu, I did and it fixed this issue for me with no other problems. You can access the service-menu with a Logitech Harmony remote or an IR-blaster app for your phone. It’s the “In-Start” service menu (code is 0413), go to menu 13, turn “TPC” off, and then just exit the menu.