Apple TV 4K Random HDMI Signal Loss

Hi Gilby86, Just wondering what sort of cable length you have between your Apple 4K TV and Sony 850E? Are you using a a/v receiver or just going direct between Apple TV and Sony?

It seemed like my system was getting hit by small lightning bolts for both audio and video. What worked for my system was changing from 2M and 5M 4K cables between the three components to 4' and 12' 8K cables (my working system now has shorter and faster cables -- also note that my system is not currently 4K). I've read but have not confirmed that 15' of cable is a limiting factor. For me the 15' of cable length seems true but I'm trying to confirm it.

Well I just bought an Nvidia Shield to try out bitstreaming TrueHD Atmos and it does work nicely with Plex and MrMC. Unfortunately, the **** random signal loss (display goes black for a second, audio persists) still occurred while the resolution of the Shield was set to 2160p using Plex. MrMC will auto-adjust the system resolution according to the resolution of the video file (which happened to be Game of Thrones in 1080p with TrueHD Atmos). Alas, the signal did not drop while using MrMC because the system resolution dropped to 1080p. So now that I've effectively ruled out the Apple TV and my Onkyo receiver (I recently upgraded models), I suppose the culprit has to be my 2017 LG OLED65C7P.

Did you try not plugging ANY device into the ARC? In other words, do not use the ARC HDMI input for anything and see if that works.

I am experiencing the same issue with the Apple TV 4K and my LG B7 TV. I randomly lose signal when an episode ends. This does not appear to be app specific as I have lost signal in YouTube, Foxnow. I have not lost signal during playback on when an episode ends. . I have been able to restart my Apple TV by holding the menu and sleep button on the remote to get the HDMI signal back. Is this possibly an HDCP handshake issue?

I have not found a solution to this problem. I think the problem is the Apple TV 4K software. I experience signal loss several times each day. NOTE: You do not need to get up and unplug the AppleTV power or HDMI to reset the unit. Instead, use your remote control.

SLEEP: Press the Menu Button and TV/Home button on the remote together. This puts the AppleTV to sleep. Press the Menu Button to restart. (These buttons are side-by-side).

Hi all,

I've been having this issue since day 1 of getting my ATV4K (which was launch day). I have an LG OLED C7 65inch (2017 model). I've tried about 4 different HDMI cables from different manufacturers. I've even tried a "premium certified cable" by the HDMI Org and the problem remains. I've also had my ATV hardware replaced - no luck.

This YouTube video captures the exact issue I'm facing: https://www.youtube.com/watch?v=AVFBQIQ7Sbg&feature=youtu.be

I've been working with Apple Support and providing system logs whenever the issue happens. They've just called me saying I should try changing "Sleep after" settings to "Never". I'll give it a shot, but I don't think that's going to work. I know the ATV is still running as music playing from it to an AirPlay speaker continues even when there's HDMI signal loss. Highly doubt it's the ATV going to sleep.

Same issue here. I have LGOLED65B7A. It happens for me on a very frequent basis to the point I can't use. DirecTVNow, iTunes movies, netflix, etc. I have to switch out of the input and switch back to get it to work. I am using a well reviewed HDMI v2 switch and ensured all of the cables in the chain to the TV were v2 HDCP compliant. Without a doubt this issue is due to how the AppleTV is handling the HDCP handshake for 4k/Dobly vision content. I would expect more from Apple since they named it AppleTV 4K and it doesn't work properly on the best 4K TV panel on the market.

And what’s the point of ATV4K if you can only run 1080P at 30hz? Might as well just use the previous gen ATV for that.

Good point. For people who cannot afford the Echogear cable, they will be restricted to 1080p 30Hz, and should sell their Apple TV 4K and get an older model.

For people who can get their hands on the Echogear cable, my experience has been that this cable supports 4KHDR at 60Hz, with best available Audio. It does not seem to matter if you choose match frame rate or not. I am using a Onkyo TX-NR747 175-Watt 7.2-Channel Network A/V Receiver, with Echogear cables on both sides of the receiver, and a LG C7, using the HDMI1 input on the TV.

Pretty sure it’s an appletv issue as I don’t have any issues when I used to have the amazon fire t. 4k streamer hooked up (using a regular hdmi cable) to the LG TV.

I will say since I switched to hdmi 2 and bought that $13 echo gear hdmi cable I haven’t had any issues, but from the sounds of this forum it’s just a matter of time. The only sure solution for me was to kick it down to Dolby vision 30hz (which has obvious drawbacks)

This isssue is all over the interwebs, not just here. Apple TV + OLED = no signal static drop outs. Take the Apple TV out of the chain, issue is gone. Something is up with tvOS and how it handshakes with the OLED.

I have a B7 and ATV 4K, same issues.

Hi all, I keep checking this thread periodically hoping that someone will announce an official fix. After almost a year, no luck. Fortunately for me, my workaround has been quite solid: my programmable remote reboots my ATV at the beginning of each viewing session. Takes a little longer to start up, but I never see the issue any more. This + good 4K cables . Horrible workaround, but it works for me.

If any of HDFury’s products do what they say they do, then yes! I just purchased their new Dr HDMI 4K which I will place between my onkyo receiver and my LG OLED. Even though I am using the Belkin cables and all the devices are 4K Dolby Vision compatible, I still get signal drops. This device is supposed to correct any and all HDMI/EDID issues. I will post my results after I have tested it for a while. For $100, it better!

I have an LG 4k Hdr, nothing fancy but the issue is only with apple tv and the way the switching of the frame rate and range is done. If you turn both off, there is no problem, but then the hdr is not working and also the movement is not smooth. I bought another new atv 4k from apple store and with the last stable release it's the same. In the Apple Store it's exactly the same, on those LG Oled screens. It's happening with all apps that require frame/range switching( BBC, My5, Netflix, All4, etc.). Good morning Apple, i'm sure your brilliant software engineers will fix this soon. In the meantime the employees have no idea about this or pretend to, and act like it's something insignifiant.

I have a Sony 850E and Apple 4K TV. Signed up for the 12.1.2 beta and have not had any hdmi picture flickering or sound problems.

tvOS 12.1.2 (16K5534a) is still the beta version. Just compared it to the newest update on my Apple TV.