Apple TV 4K Random HDMI Signal Loss

Good news - hopefully it sticks. If I recall tvOS is Beta 4 -- I'd think there may be one more Beta before they release final. I think when Apple released the version that brought in ATMOS - things became dicey. That's my only complaint with Apple - they tend not to let users know of issues with existing versions - so you go out and change cables - sound bars, etc.

The issues seem to be more related to certain products - e.g., Sony Projectors, LG OLED. The problems hit a smaller, narrower, group of users - making issue detection and reporting more complex - and less likely to be found quickly. Not an excuse - just facts - the way I see it. Still hoping Sony will put out a FW update for our projector -- they are difficult to deal with - we see no issue is what they told me! Anyhow, hope your ATV continues to work well with the Beta.

I recently signed up as a beta tester, and had downloaded the latest beta version of tvOS. I also turned off automatic software updates. I just checked my AppleTV, and it shows that I'm running tvOS 12.1.2 (16K5534a). I assume this is no longer the beta version, but I can't recall how the beta version was displayed, though presumably it said beta somewhere. If I've been automatically updated to 12.1.2, I don't know when that happened. I did, though watch Netflix last night with no issues. I have an LG C9 OLED TV, with my AppleTV connected to a SONY soundbar model HT-ST5000.

I have updated to the latest stable OS (not beta yet) 12.1.2 and tried both ports that are non Arc with the same results. The TV is an LG UH668V, it's an 4k and HDR TV. In the specs of the HDMI ports of the TV, all 3 are listed as being 2.0a ports. The problem with Netflix is still present ( pressing the menu button to stop the movie and go back gives the black screen for 1-2 seconds). I have to test further, maybe try the betas or wait on the 12.2 final release. The new cable gives a better image quality though, i could tell from the first view of the home screen, the sharpness and detail are better, and i think the contrast too. First time noticing that from an HDMI cable.

I had no luck with the belkin cable, latest stable and beta release , non arc or arc ports, tried everything. I was still getting the black image for 1 2 seconds in netflix . I sold it and got something else, this was too stressfull for such a basic thing that should just work. Maybe with the new releases they will fix it. But this product came out in 2017, so it’s a shame, it’s 2019 and the problems are still there.

I think you are correct, the problem is either with the Apple TV 4K hardware or software. I was going to the Apple TV 4K unit and physically unplugging the power cord then reinserting it. I'll try to put it to sleep and wake with the Menu button. I may bring the unit back to Apple since I have not had the problem on other Apple TV 4K units I purchased at the same time.

My Apple Tv4k just lost signal three times in ten minutes. I’m giving the Echogear HDMI a try...

I've been connected via Ethernet since day 1. Definitely has nothing to do with WiFi. My guess it's a fault in the HDMI handshake process between the Apple TV and TV. tvOS software issue I assume.

Worked ok with the Costco cable for a few weeks then the problem cropped back up. Now back to the Echogear and everything is working so far.

I am thinking this is an HDCP handshake issue with the TV and the devices. Since LG is taking a very long time to release a new firmware update to the US, I am hoping this will be fixed, soon.

Not an Apple issue, although it happens with the Apple TV.

I have the same issue with the Xbox One S.

I think the issue rests with LG, especially when you look at all reports about this issue.

I have the same issue with an Apple TV4, which makes me think it is a coding problem, also it seems to have gotten worse since last tvOS update. It is connected to an acer Beamer.

I have ATV 4K, LG C7 TV. Everything was working perfectly for about a month, but now I am experiencing same random HDMI signal loss issue. It tends to be intermittent, but I have noticed it happening more frequently this past week. It is very frustrating. I'm not convinced that it has to do with HDMI cables as it was running perfectly for past month using same cables (which are brand new: Amazon Basic). Perhaps it can be fixed with a software update?

Same issue with my LGC7. Spoke with Apple last night and they suggested it was a cable issue, but they offered to replace my Apple TV with a “remanufactured” replacement.

It is the opinion of the group that I will likely experience the same issues with a different Apple TV box? I don’t want to go through the time and frustration if the problem will likely persist...

I appreciate the help and advice. I got a new tv within a few days of getting the 4K Apple TV, so I don’t know whether the tv, the HDMI, or the Apple TV is the problem (the same HDMI cable was connected to the previous gen Apple TV and I never had any issues, and I didn’t notice a problem with the Apple TV 4K before upgrading to a 4K set, but it had only been a day or two before I switched) and am trying to save myself a lot of troubleshooting time.

At least now I know that replacing the Apple TV won’t solve the problem...

Thanks for sharing your experience with that cable. I know one other person in this thread also said using this cable fixed their issue. This cable looks like its in stock oil January 11th at Amazon. So I'll give it a try and report back. I'm really hoping this is actually a cable issue and not some other underlying issue with either the TV or the ATV4K.