Question Samsung TV link over wired LAN going up and down

Jun 6, 2020
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i am attempting to get a samsung NU6900 smart tv up over ethernet. it's connected directly to a Arris NVG468MQ router. unfortunately, its stock firmware and not running anything fancy like DD-WRT or Tomato.

i have tried multiple cables(one made by me, one manufactured, both tested OK), and tried 3 of the 4 available LAN ports on the router. initally, you can see some blinking on the router port for a few seconds, then nothing forever.

i decided to turn on the remote logging feature and send it to my pi. it appears even though the router lights stop, the link is still going up and down:

Code:
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L7: Port lan-4 sending UP event
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L7: EthQ: Setup queue NC (oid 11) with qos marker 0x800
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L7: EthQ: Setup queue EF (oid 12) with qos marker 0x1800
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L7: EthQ: Setup queue AF (oid 13) with qos marker 0x2000
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L7: EthQ: Setup queue BE (oid 14) with qos marker 0x2800 (default)
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L7: Ethq #1: prio 1 max 0kbps
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L7: Ethq #2: prio 2 max 0kbps
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L7: Ethq #3: prio 3 max 0kbps
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L7: Ethq #4: prio 4 max 0kbps
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L7: phy.enet[4]: setting state from 'down' to 'up'
Jun  6 20:15:22 dsldevice/184795205928848 sdb[2086] L3: ELAN: Port lan-4 is UP. (eth4) speed 100 duplex full
Jun  6 20:15:23 dsldevice/184795205928848 sdb[2086] L7: Port lan-4 sending DOWN event
Jun  6 20:15:23 dsldevice/184795205928848 sdb[2086] L7: RDPA: removed queue from i/f=eth4
Jun  6 20:15:23 dsldevice/184795205928848 sdb[2086] L7: phy.enet[4]: setting state from 'up' to 'down'
Jun  6 20:15:23 dsldevice/184795205928848 sdb[2086] L3: ELAN: Port lan-4 (eth4) is DOWN
this repeats, over and over for as long as the cable is connected. so, enough time for it to negotiate link speed but that's as far as it goes. what are some of your thoughts? all i can come up with is "bad NIC on the TV". perhaps i am not thinking clearly. thanks
 
Sometimes marginal cables can do this, but I've seen weird unsolveable negotiation issues twice as well, so it could be something that obscure.

I'd try yet another cable if not a dozen more and if that doesn't work, throw a dumb switch in between the tv and the router and see if that helps.

I have the exact same tv and have it connected via some av600 powerlines and it works fine, no issues.
 
Jun 6, 2020
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i definitely will be hooking up a hub this week, to make sure it isnt something silly like the NIC not being able to push 50ft. but at this point i'm out of ideas. ill try more cables too. thanks
 
I'd check it with a hub with a short ethernet cable and make sure you can get ethernet that way. You can run a speed test using the built-in browser and it's not too bad if you're using dslreports.com/speedtest or fast.com.

The other thing is that if you're running 50ft, and if it's not just a straight patch cable (ie, wall jacks or other stuff involved), it could be that other stuff or a cheap patch cable as the longer ones have to really be made right to work right at those distances.
 

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