Ok, this is for EVERYONE having issues with their Samsung HDTV's and ANY Amazon Fire TV device. I had purchased the Amazon Fire TV Cube and hooked it up to my Samsung 49" UHD 8000 series Smart ( Tizen ) TV. It worked great for a month. Then I unplugged it for several weeks as I was testing some other Android boxes. When I tried to re-connect the Cube, I would only see the Fire Tv logo, then nothing Black Screen. I connected it to a smaller generic brand TV, it works fine. I tried different quality HDMI Cables and splitters and everything. Just would not show up on my Samsung TV. Crazy Right ? I went thru a dozen forums reading, bla bl bla, nothing worked. Well being an Electronics Tech I finally deduced, the TV had to forget about this device and re-recognize it as it did the very first time. So I UNPLUGGED my TV, and did a low level degauss. You hold a metal object across the 2 prongs of your TV's power wire and it drains the CMOS memory to an extent. No harm can be done as it is not plugged in... this is just a basic cache memory dump. After holding that butter knife across the prongs for 20 seconds, I plugged the TV back in and turned on my Fire Cube and it works perfectly. Enjoy !!!!!!!!!!!!
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