For a 4K TV to work, you need three things: a 4K-compatible HDMI cable, a 4K-capable Blu-ray player, and a 4K content source. A 4K-compatible HDMI cable is required to connect your 4K TV to your 4K content source. This type of cable is able to carry the necessary data bandwidth for 4K content. A 4K-capable Blu-ray player is required to playback 4K Blu-ray discs. If you don't have a 4K Blu-ray player, you can still enjoy 4K content from streaming services like Netflix and Amazon Prime Video. A 4K content source is necessary to provide footage or movies in 4K resolution. This can be either a 4K Blu-ray player, a 4K streaming media player, or a 4K cable/satellite box. Once you have all three of these components, you'll be able to watch 4K content on your 4K TV. Enjoy!