RT-AC66U has solid LAN LEDs (3&4) and no internet access

[Bill_me]

Recently my Asus RT-AC66U became unable to connect to the internet and whenever I turn it on, the LAN LEDs (#3&4) are solid when nothing is plugged into the LAN ports at all. LAN 1 and 2 seem to always be dimly lit as well and I can't remember if that's the normal state, or that means something too. LAN 4 seems to blink whenever my computer is plugged into any of the LAN ports, but I find my computer is unable to communicate with the router using the hard connection. Wireless seems to work fine, so I can access the router settings.

I have already tried various times to update the firmware, clear the nvram, and restore factory settings and still the LED's remain on when nothing is plugged into any LAN port. I tried the Asus recovery mode, but the application kept saying there was no router in recovery mode so I gave up on that. It seems to be a hardware failure of sorts, but I haven't been able to find anything about what that code could mean. I've attached the best picture I could take of the status lights.

Any ideas what could be wrong?

 

[KevTech]

I tried the Asus recovery mode, but the application kept saying there was no router in recovery mode so I gave up on that.

Did you set your network adapter to a static IP when using recovery mode?

 

[L&LD]

If you can RMA it, do so. If you can continue to use it without wired access, do that (if an RMA or warranty exchange is out of the question).

Otherwise, time for a new router.

 

[TonyH]

Recently my Asus RT-AC66U became unable to connect to the internet and whenever I turn it on, the LAN LEDs (#3&4) are solid when nothing is plugged into the LAN ports at all. LAN 1 and 2 seem to always be dimly lit as well and I can't remember if that's the normal state, or that means something too. LAN 4 seems to blink whenever my computer is plugged into any of the LAN ports, but I find my computer is unable to communicate with the router using the hard connection. Wireless seems to work fine, so I can access the router settings.

I have already tried various times to update the firmware, clear the nvram, and restore factory settings and still the LED's remain on when nothing is plugged into any LAN port. I tried the Asus recovery mode, but the application kept saying there was no router in recovery mode so I gave up on that. It seems to be a hardware failure of sorts, but I haven't been able to find anything about what that code could mean. I've attached the best picture I could take of the status lights.

Any ideas what could be wrong?

IMO, all you tried for naught. You can't fix hardware failure trying those things. Time for a new replacement if unit is out of warranty.