HDMI input does not work

I loved the PPM 620 but I have been having issues. For some reason the HDMI port does not work.
Things I tried:

  • updating all apps
  • Without charging, with charging
  • Set FireTV stick instead of auto to fixed resolution
  • Other cables
  • Other devices (laptop, nintendo emulator)
  • Reset to factory default

Im a bit out of options. I get it to work for 3 seconds with firetv and after no input message. I shared a video of that