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Kum Dana

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Aug 2, 2024, 12:42:59 PM8/2/24

to inmabooru

Having an issue whenever I output my Apple TV 4K in Dolby Vision 4K 60hz or 50hz- I get a very quick flicker (almost like a second image of the screen superimposed over the main image, but slightly shifted and discolered).

It it happens very quickly once every 30 seconds or so and is most noticeable on the main menu screen (but also happens during video playback). It only happens in Dolby Vision output. 4K HDR and 4K SDR are fine.

I also have some DV flickering issues quite often, sometimes every 10 or 20 seconds. Took a slo-mo video and managed to capture a frame. Looks like some of the colours are way off horizontally. Could you confirm this is the same issue you guys are having?

Hi. I started noticing the EXACT same thing when LG pushed it's WEBOS updated last week. I have a 65" LG model 65SJ8500 and everything was working beautifully fine until LG pushed the update. Now i get that flicker and it's really disappointing.

I walked into the store where I bought the television and, of course, the LG rep is telling me that it's an AppleTV issue. The sales rep actually suggested I try another '4k source, like the LG 4k blu-ray player.'

Exact same problem here. I had a legacy Belkin HDMI cable that passed the Dolby Vision test. I saw those (typically red) flickers every few minutes. Tried a newer Belkin cable - but not the one recommended by Apple - and issue was same. I did order the cables Apple suggested, but I'm not sure that will solve it.

The problem disappears when using other sources (non Apple TV), or switching video modes/frequency, so is obviously not a problem with the TV itself (or Apple TV), at least hardware wise (seems to be software/firmware compatibility related)

In regards to the flickering issue, I am having the exact same problem with my new LG OLED65C7P and my ATV4K. I am also experiencing an issue with my SJ9 sound bar in which when I turn on the ATV4K, the TV and the sound bar turn on, but there isn't any audio UNTIL I switch the input from HDMI 1 to something else and then back to HDMI 1. It's extremely frustrating; especially when you have to describe the issue to your guests that want to utilize the TV. Has anybody experienced this as well?

I am experiencing the same issue with a Vizio M75-E1 that supports Dolby Vision. The cable I have passes the Apple TV test and then auto-switches to Dolby Vision after the test. I created a thread about it since most of the threads here are focusing on LG tvs but this is not isolated to LG. It's happening with Vizio too. I think I even saw a thread where it was occurring on Samsung TVs too.

It appears netflix has implemented the automatic picture mode and framerate switching. The flickering does not happening when watching a dolby vision video on netflix. This is probably because netflix is dropping down to 30 or 24fps on the video playback. My guess is this problem is only with 60fps dolby vision mode.

After playing around with the latest tvOS build that supports native format switching I think I found a workaround. Instead setting the resolution to dolby vision 4k 60fps just leave it at HDR 4k 60fps. When playing back dolby vision content from Netflix it will switch to dolby vision mode automatically during playback and it will drop back to HDR when in the menus. The flicker does not happen during playback of dolby vision content.

On 11.2.5 I am getting crazy artifacts/flickering even when set to HDR 60HZ, or 50HZ, or 30HZ and not DV. The screen turns purple/static/blue in parts and flickers. I'm even using the stupid Belkin Ultra HD cable that apple recommends for Dolby Vision.

I'm having this same issue. I wasn't seen this before. I don't know what's causing it, Netflix app probably broken after update but it flickers a lot on HDR on my appletv. I tried turning off true motion but I'm still having the same issue.

Also when I go from anything with dolby vision like Netflix or Disney+ to the home screen the screen is constantly flickering and then my TV (lg cx) tells me its a invalid format. Only way to fix it is unplugging the hdmi and plugging it back in. Anyone have any ideas what it could be? Maybe a bad hdmi cable?

Make sure the HDMI port you are using on the TV is set to allow 4k HDR i.e its optimal/full and not limited (sorry I have Philips OLED not LG so not sure the setting name for the CX). Make sure its not set to PC.Disable VRR and 120hz on the xbox and just run with 24hz/50hz/60hz options ticked initially. Dont tick the allow 422 in xbox settings.Try a different HDMI cable, though the above settings will limit bandwith usage anyway.Disable all HDMI CEC stuff.Try a different HDMI port on the TV.

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