Odd that it's choosing "50hz" (unless you are in the UK).
Does the TV have another HDMI port? If so, it may be worth testing on a different port. Not uncommon for ports to fail (partially fail), especially if they are often being connected/disconnected.
Does the TV have another HDMI port? If so, it may be worth testing on a different port. Not uncommon for ports to fail (partially fail), especially if they are often being connected/disconnected.