I’ve been fighting with this issue on my own for awhile and just found this thread. While my end goal is to control my TVs via voice with my Echos, I don’t need to involve the Echos at all to reproduce the problem. All I need is the SmartThings app on my phone.
5 minutes after turning off my TV (which is using wired networking), the TV tile in the SmartThings app shows up as disconnected (a cloud with a line through it). At this point, using the Scene I created in the SmartThings app to turn on the TV does not work. Running the Scene just displays an alert that says “Family Room TV On ran, but some devices didn’t work” I also can’t turn the TV on using the TV’s tile in the SmartThings app (cause the power button was replaced by the disconnected symbol).
The interesting thing here is that even though I can’t turn the TV on via the Scene or tile, if I drill into the tile and go to the “Remote” screen for the TV, I can use the power button on that screen to turn on the TV. I have no idea why I can’t remotely turn on the TV, yet I can use the virtual remote (remotely) and that can turn on the TV. Very strange.
After reading this thread this morning, I decided to test out the wired vs wireless settings. I only had time for one test before going to work today, but I was able to turn on my TV using the Scene when the TV was set to use wireless, after the TV had been off for more than 5 minutes. I’m at work now, hours later, and the TV is showing up as Off in the SmartThings app as opposed to showing up as disconnected, so I’m hoping this means it’ll work. Fingers crossed.
Even if using wireless does address this particular issue, this is quite annoying. I ran wired networking to my TVs during my remodel last specifically so I wouldn’t have to deal with wireless. Given that Samsung can turn on the TV (even if using wired networking) from their app by using the virtual remote, it seems like they really should be able to make Scenes work. Just provide the option to use the virtual remote power on/off in Scenes…