R8000P Lan port not working - No light and no internet on faulty LAN. Other 3 Lan's OK

[Richhew1]

R8000P Lan port not working - No light and no internet on faulty LAN. Other 3 Lan's OK. 

I have checked the same device connected to another LAN and all ok but nothing works in faulty LAN

[antinode]

> I have checked [...]

   Sounds as if the port failed.  Unless there's some trivial mechanical
damage, I don't know what you can do about it, other than to connect a
suitable network switch to one of the working ports.

   Did you have a question?

[Richhew1]

thank you