My TV is not syncing with my LEDs?

You are required to connect a HDMI device into the input slot on the Fancy Sync Box, please refer to page 7 of the instruction manual. This page also contains a list of compatible devices.

A compatible HDMI device is required for the syncing of the LEDs, integrated apps on the TV will not be synced. So if you would like to watch Netflix for example with synced LEDs, you will have to watch using a compatible HDMI device like an Xbox or Amazon Firestick.

You can also view the list of compatible devices on the website:
https://fancyleds.com/products/fancy-sync-box