Sevrard wrote:

Can anyone please explain how to change the video setting to 4K HDR 30 HZ instead of 60 HZ and change the advance setting from 4.2.2 to 4.2.0? Thank you. 

Settings > Display Type will let you change to 4k HDR 30. I'm not sure about the 4:2:2 pulldown.

Thank you

911jason wrote:

Sevrard wrote:

Can anyone please explain how to change the video setting to 4K HDR 30 HZ instead of 60 HZ and change the advance setting from 4.2.2 to 4.2.0? Thank you. 

Settings > Display Type will let you change to 4k HDR 30. I'm not sure about the 4:2:2 pulldown.

4:2:x settings are under System/Advanced Settings. 

I recently noticed that being on the 4k hdr 30hz option will not let you watch in HDR on netflix.

Those shows show as simply 4k ultra HD.

But of you switch back to 4k hdr 60hz they are HDR.

It's annoying because the issue is intermittent when I am on 60.

I just went to settings from the home screen and changed the resolution fro. 1080p to 720p and the problem went away.

Boojitede wrote:

I recently noticed that being on the 4k hdr 30hz option will not let you watch in HDR on netflix.

Those shows show as simply 4k ultra HD.

But of you switch back to 4k hdr 60hz they are HDR.

It's annoying because the issue is intermittent when I am on 60.

That's Netflix. They only support HDR at 60Hz. Nothing can be done from the Roku side of things. 

I have the same flickering problem when using one of those dirt cheap Amazon Basic HDMI cable to connect the Roku Ultra to a Samsung 55" 4K Ultra 3D Smart TV (model number: UN55JU7100F) . This TV uses an external "One Connect" block where all inputs to the TV are located, the One Connect block then connects these inputs to the TV via a single cable. Since I bought the Amazon HDMI cables 3 at a time, I replaced the HDMI cable by a another. This stop the flickering immediately. So maybe it is just the HDMI cable that caused the flickering to black screen? 

Also: Roku Ultra is a bandwidth hog; even when the TV is off, it is online and it turns my chrome browser to do just the very slow "basic HTML". I have now learned to unplug the Roku Ultra network and power supply lines whenever I am not using it. This seems to work. Network bandwidth is back to its fast normal self when Roku Ultra is not connected. 

So had the same issues. Turns out the keystone wall plate insert for HDMI wasn't compliant with 4k HDR. I also had the amazon basics HDMI cable in the wall. Once it was plugged directly into the TV worked perfectly. Give it a try.. Drove me nuts until I figured out that stupid connector was causing all the issues. Looked it up on Amazon and found others had the same issue with them.

1/2/2019 and this issue is still happening...

Just purchased a ROKU Ultra.  Had the issue with screen going black every few minutes (though audio still works).  I am running this through a receiver.  When I plug the ROKU direct into the TV (a Sony), it works fine.  Would like to run it through the receiver to get it to run through my high-end speakers instead of the TV speakers.  I tried going to 720 (no luck), and doing everything other people tried.  No luck.  It is just a SONY 1080p tv.

Thanks for the note here. A couple questions:

- What are the specific makes/models of the A/V receiver & TV you are using? 
- Have you tried connecting the Roku directly to your TV, then using the TV's audio out to route the audio to your receiver? Does the same issue occur? 

Please feel free to PM me with more details, including your Roku account email address, the serial number of your Roku device from Settings>System>About and I'll help take a closer look to see how else we can assist. 

Thanks!
Tanner

For you guys getting an intermittent black screen, try disabling your auto adjust display fresh rate underneath Advanced display settings

Don't know if this will work for anyone else. I had the same problem with my tv picture going off then on over and over for the last few days.It came out of nowhere and I tried a few things and was finally successful.Yesterday I unplugged my tv and DVR for a few hours and booted my DVR then plugged my tv in and when it rebooted the problem was gone.Don't know if I was lucky but thought I'd mention it since it sloved the problem.Good luck and let me know if it works for anyone else.

I am also having the black screen issue with the Roku Display Type set to 4k HDR 60hz with a brand new Vizio PX65, I did not have this issue with a Vizio M60.
If I manually switch the Roku Display Type to 4k HDR 30hz, the black screen issue goes away, but any motion on the screen looks awful.
4k 60Hz also does not have the black screen issue, and looks ok.
So I agree with others, this is an HDR issue with the Roku.
I have switched out HDMI cables and have the issue with both new Vizio and Amazon Basics cables.