In the last few weeks, Samsung updated the OS to the Frame TV and a function that I regularly used is no longer available. I'm writing in hope that someone can suggest a workaround (or if Samsung engineers read this, to bring the function back).
I have the exact same problems as you. Samsung support has been awful and is not doing anything to help. Each representative just says it’s a device issue on my end. Obviously that is not the case, as the forum is filled with people with the exact same issues all after the Samsung updated firmware
I just spent the last hour plus with Russel, a really helpful Samsung tech who developed a workaround. I ran a few tests and now when I power down Apple TV 4K, the Frame TV goes instantly to Art Mode (just like it should 🙂)
Russel will post the workaround in this thread soon.
Does it stay in Art Mode after the workaround? The other problem is that it leaves Art Mode and has the "Check Device Power" on the screen forever until you see it and fix it.
First is you need to change the setting in your connected device to power on/off your tv. it's the CEC setting you can see on the remote setting of your connected device(cable box, apple tv, roku, etc..).
Second is to turn off the start screen option Smart hub in the Samsung tv setting(general and privacy).
Third is you need to Power cycle both devices.
After that I believe your art mode should appear every time you turn off the connected device.
If you are having trouble without the connected device you should follow this step
Did what you posted. After the TV in art mode went to sleep and turned on again with motion it did not go back into art mode. Instead it started playing the lifetime whatever channel on the TV.
The problem is ART mode keeps stopping on its own after sleep and when it use and switchers to either an active HDMI connection or the TV mode when there is no attached device on HDMI. This does not fix this issue.
The sleep ATV and switches to ART MODE works. It’s half a fix. ART mode is broken.
I messaged Russel, the Samsung tech, asking him to reply to this thread (UPDATE: I see that he did reply above) I attempted to recreate what we did earlier today, but couldn’t recall all the steps (we did a lot over the course of one hour). I think it involved these screenshots, but there could have been others. Note that the first two are of the Samsung interface, and the third is Apple:
Now, when I power down Apple TV 4K, the Frame immediately goes into Art Mode. One limiting factor I recall is that we only use Apple TV 4K in my home, and not the Samsung TV Plus which was the default. Russel assisted in limiting that, or making Apple TV 4K the default.
Sorry I have only scattered info here. Hopefully we’ll here from Russel who can set the record straight.