As to repair, this is highly unlikely. You can try installing the router's latest firmware which will put it through a full reset but the few times I've had dead ports the router remained dead after resets and firmware updates.
Repair is unlikely since repair costs are greater than replacements.
All four of the LAN ports on my TP-Link AC5400 have suddenly failed. The WAN (5th) port connecting to the modem still works. As it happens I have only a printer and a home server that are hard wired to the LAN ports and I didn't even notice there was a problem for a couple of days.
All WiFi devices still function and can reach the internet. But none of the 4 LAN ports show any sign of life. I've rebooted the AC5400 but that didn't fix anything.
Is it likely that the LAN ports would all suddenly fail - yet the WAN port continue to work? I needed a quick fix and replaced the AC5400 with a 3 node Google WiFi mesh which is performing wonderfully. But I'd like to resurrect the TP-Link AC5400 if possible - it is a rather high-end router! when I get time I'm going to try a hardware reset and see if that restores the LAN ports.
It is certainly possible that this was a hardware failure. Just wondering if anyone else has experienced this.
Any insight into this sort of issue would be greatly appreciated.