What HDMI input do I connect the Xbox One X?

Hi, on the Xbox One X as with all of the Xbox One range, there are two HDMI connections. One is an HDMI-Out and one is an HDMI-In. You will see next the HDMI connector a label describing what HDMI it is. You connect the included 4K HDMI cable to the HDMI-Out
to display the console on your TV. The HDMI-In is optional. It can be used to connect a Cable or Satellite receiver to your console.

This guide will help you further.

I was using a 4x splitter with the "out" HDMI to a 5040UB Epson Projector. I plugged the xbox into one of the 4 input hdmi spots on the splitter. My laptop was put into another and a TV Box into another. It did not work. The screen frequently blanked
out and during any video activity from any of the input devices did the same. I changed all the HDMI cables to the best 4x I could buy and this still didn't help.

However, when I connected the splitter to the Xbox one x (one of two HDMI connections) and the Xbox one directly to the projector everything worked perfectly. I could switch between any of the inputs to the splitter. Of course when I wanted to use the
xbox one x for all the xbox stuff I simply went to the xbox home screen and away things worked with no issues.

Keep in mind that if you connect the 360 to the HDMI input on the Xbox One that there may be considerable input lag. That setup is not supported and any issues with it will not be able to be troubleshot by support.

A simple HDMI switch should be able to do what you need it to if you want to look into that option.

I will check but I do have an AV system which is setup up just like the Basic Set Up Guidelines specify:

Basic setup with an audio/video receiver

With an audio/video (A/V) receiver, the best and most direct option is to connect the devices sequentially:

1. Connect your set-top box HDMI output to the Xbox One HDMI input.
2. Connect the Xbox One HDMI output to your A/V HDMI input.
3. Connect your A/V HDMI output to the HDMI input on your TV.

Now I will have to see if the TV has HDMI output to include A/V if Xbox needs to go directly to TV or switch to optical

Make sure you are using a HDMI 2.x cable. Try using another HDMI port on your TV. I have the 50" RU7100 and it works great.

Also check what mode your TV is in when connected to your Xbox. With your Xbox on, turn off TV, turn TV back on, check top right and it should show input and resolution.

Mine is 3840 x 2160 / 60p Input Signal Plus