My Xbox does not send an HDMI signal

of course and with another TV too

Try this:

Power off your console, and then unplug the power cord to ensure that the console is completely powered off.

2. Wait 30 seconds, then plug the power cord back in.

3. Press and hold the BIND (controller sync button located on the left side of the console or bottom right if a one S or one X) and the EJECT button and then just press the Xbox button on the console once.

4. Continue holding the BIND and EJECT buttons for 10-15 seconds.

5. Listen for two “power-up” tones a couple of seconds apart. You can release the BIND and EJECT buttons after the second power-up tone.

6. The console should power up and take you directly to the Xbox Startup Troubleshooter.

7. To reset your console from the Xbox Startup Troubleshooter, use the D-pad and A button on your controller to select Reset this Xbox.

9. When prompted, select Keep games and apps. This option will reset the OS and delete all potentially corrupted data without deleting your games or apps.

Hello jefersonmedina!

Thanks for reaching out to Xbox forums support.

Below I'll provide you with a direct link for troubleshooting that exact issue.

Troubleshooting a blank TV screen or monitor while your Xbox One is on

Try those solutions out and let us know if it helps!

We look forward to hearing back from you! Good luck!

Felix

Xbox forums support

Did you tried with a different cable?

It is an hdmi-in

It is most likely an HDMI-out, not HDMI-in, meaning you can send out signals, like a computer or dvd player does, but not receive them, like a tv or monitor does.