Firestick won't play on TCL TV
I have an Onkyo HT-r390 receiver. I recently bought a new TV, a TCL 55R615. This replaced an older LG TV. The Onkyo has a Firestick and a closed circuit TV system hooked up to it via HDMI, and then the HDMI out goes to the TCL HDMI 1 input. This was basically my setup before, with the addition of a Roku hooked up to the Onkyo as well, which I no longer need as I use the TCL built-in Roku app.
What is strange is that I cannot get the Firestick to play on the TCL. The closed circuit TV will, but not the Firestick. If I plug in the Firestick directly to an HDMI input on the TCL, it will play, but not through the Onkyo. I tried changing the HDMI jack to a different one on the Onkyo, but it still won't play. I just get a blue screen. I'm out of ideas as to what could be wrong.