Apple TV 4K NO SIGNAL/INPUT issue

After trying without success all the usual stuff (change cable, change input, cycling power, restart Apple Tv, ETC....) found on the Internet about the "NO SIGNAL" issue, I tried something else: instead of starting my setup with the Apple TV remote, I used the Samsung TV remote.

IT IS WORST ! Using the Samsung remote results in the TV opening first, then the TV says "NO SIGNAL"... Of course, it's because the Apple TV starts a couple of seconds later when using Samsun remote.

When the Apple TV is finally awake, the Samsung TV shows the image of hte Apple TV after a couple of hesitations. BUT every time I starts my setup that way, the TV will loose signal from the Apple TV after 1 or 2 minutes. I have to use the Samsung remote to manualy click on the source to get the image back.

So, it is definitely an HDMI-CEC problem ? I can't turn it off on my TV since it's controlling my Samsung Q-Hamony soundbar via eARC.

And why this HDMI-CEC do not happend on my other TV's with Chromecast or Apple TV HD ?

Technician sent by Sasmsung (but not a Samsung employee) came home and tell me that the TV is not the problem. For him, the porblem comes from the Apple TV 4K after running diagnostics on the Samsung TV.

The only thing I can do know is go the the AppleStore for a repair or an exchage (I'm still under warranty until December 16th.

What do you think ?

Yes my TV remembers the last input used. So the TV opens on the last input it was ON. I guess it may be an CEC issue. When the problem happens, the TV indicate that the source have NO SIGNAL after I the TV was opended with the Apple TV remote. I have to use the TV remote to select the HDMI input (the same input that indicate NO SIGNAL) and the signal is back again ! Of course this is not a major issue since it's happening maybe every two days, but it's just anoying and not normal.

Hello again,

I just had this problem again today after 4 days off.

I checked and HDMI-CEC is enabled on my TV. So, I start my TV AND my Apple TV by pressing the POWER button on the Apple TV remote.

My TV is programmed to open on the last source used. So, on HDMI 1, on which the Apple TV is connected.

The TV and the Apple TV therefore open simultaneously on the HDMI 1 source.

For some reason, once every 3-4 days (so several ignitions are done without problem), the TV seems to ignore that the Apple TV has turned on at the same time. So I have to go to the TV menu and choose the HDMI 1 source with the TV remote control and the Apple TV image comes back.

Obviously if I unplug and replug the HDMI wire it also works, but it's more tedious.

My TV has been checked by a technician sent by Samsung and I am told that if there is a problem, it is with the Apple TV.

My Apple TV is under warranty until December 2023. I could always go to the AppleStore to do a warranty exchange. But I doubt that the Apple TV is faulty. As a technician told me: an HDMI socket works or does not work. There is no in between.

Hello,

Thank you for you answer.

OK, so I am not the only one to have this problem.

I guess it is a random problem with the Apple TV 4K hardware or the TvOS. If I go to an AppleStore and they give me a refurb Apple TV (since I am on the one year warranty) I wil have the same "random error".

I have checked an the Anynet+ is active on my TV.

I hope TvOS 17 will help with this problem.

My TV is programmed to wake up to the last input used: the one that the Apple TV is on.

When I use the Apple Remote to open eveything, I get the no signal issue every 2 or 3 days. I have to use the Samsung remote to select HDMI 1 and I get the image back.

When I open everything with the Samsung remote, I get the no signal issue everytime after 1 or 2 minutes of normal image from Apple TV.

Thank you for your answer.

Yes, I have tried 3 cables and different port. I have read and try everything on the inernet including Apple pages.

I will try the two things that I haven’t try :

buy an HDMI-CEC killer (BlueRigger on Amazon) and try a factory reset.

I nothing works I will go to the AppleStore. I have plenty of time since I’m under warranty until December 16.

But since this Apple TV worked on my old TV and since all HDMI ports on my new 4K TV can’t be defective, I guess the problem comes from CEC or the design of the Apple TV itself. But I guess exchanging my Apple TV for a new one will clear my mind of they both do the same thing.

I think I have solved the issue by turning OFF the "INPUT SIGNAL PLUS" option on the Samsung TV.

This is strange because INPUT SIGNAL PLUS is supposed to expand and have a better HDMI signal AND allow HDR to be outputed by and external device (Apple TV).

But even with INPUT SIGNAL PLUS turned OFF, my Apple TV is still outputing an HDR/HDR10+ image on the TV.

Thanks for the info.

In the AppleStore, the only cable sold by Apple is a Belkin 6 feet cable.

Maybe I will try a shorter cable, but I'm not sure I can do it with my setup because the TV is on the wall and the Apple TV is a couple of feet lower on a shelf.

Yes, I will give you an update.

But, I will not install the new cable today because I want to be sure that the problem is related to the INPUT SIGNAL PLUS option. I want to continue my test one our two more days.

Today is the 4th day that I did not have the NO SIGNAL random problem at startup since I have turned off the INPUT SIGNAL PLUS. When the option was turned ON, I lasted a maximum of 4 days without having the problem. So I want to be sure that INPUT SIGNAL PLUS is the real problem.

Because if I still have the problem with the 3 feet cable and INPUT SIGNAL PLUS turned on that means that:

1- the Apple TV is defective and I will have to go to the Applestore for an exchange under warranty;

OR

2- there is simply a random bug concerning the INPUT SIGNAL PLUS option between Samsung and Apple (and it will be not the first time that Samsung is complicating things with Apple).