The port in question is about a 500 use connector. Yes it will go far beyond that but in rough handling I've seen failures in 500 uses.
But did you try the old unplug it all, remove power and wait 30 minutes before applying power and trying the port again?
Repairs are a rather short list such as:
1. The 30 minute item I noted.
2. Another HDMI cable.
3. Replacement of the board the HDMI port is on.
4. In some sets the input board is only that so you replace 2 boards.
Sorry but the boards are not considered user serviceable.
I have a LG Plasma TV (50PV400) and two out of the three HDMI ports stopped working. I have plugged multiple devices into the first two ports and the tv says no signal. However, HDMI 3 works fine with the devices. There was a storm during the day that may have fried the HDMI inputs. The TV is plugged into the wall.
Does anyone know what part I would need to correct the issue? Is this common for a HDMI input to stop working? The tv was working fine in the morning.