Purchased a new 55" 8-series TV last week, and all went well with the setup (network, connectivity, etc.), but it is consistently black-screening with "No Signal" error from the HDMI input from my DVR. Seems like others are having similar issues with AV receivers, etc. but didn't want to hijack a thread that was "close".
I purchased a new HDMI 2.0 cable, in case it was an issue with signal handshakes, to no avail. The only way to restore the signal is to unplug / plug the HDMI cable and continue.
Sometimes I can get through 1-2 hrs of TV, no problem. More regularly I have to unplug the cable every 3-5 minutes. The "Smart Hub Connection Test" reports that everytihng is fine, but there must be some HDMI handshake that is dropped to cause this conflict.
Connected to a Tivo Roamio Pro. Have tried the HDMI 1 & HDMI 3 inputs - same problem; different cables - same problem.
UN55KS8000 software version is T-JZMAKUC-1162.2, BT-S
Older Samsung (UN40ES6500) worked great for years, it's only the new TV that has introduced this problem!
I have the same problem with the same TV. Please post back with the results of your troubleshooting. I noticed they posted a new firmware update too. Are you running the latest firmware? Did a factory reset help?