TCL Roku TV not detecting the Ethernet connection usually means the physical link, router path, or software settings are blocking the wired handshake, not just a Wi‑Fi glitch. The TV may show “No Internet” or simply ignore the cable even though the port exists and the cable works fine in a PC or router. Below is a logical troubleshooting stack you can follow at home; if you are in Nairobi or a similar broadband‑dense area, most of these steps are easy to try with a standard router and Cat 5e/Cat 6 cable.
1. Confirm the TV actually has a true Ethernet port
First, check that your TCL Roku TV even supports wired Ethernet:
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TCL Roku 4K TVs generally have a LAN/Ethernet (RJ‑45) port on the back; older or smaller TCL Roku‑branded sets sometimes only ship with Wi‑Fi and no wired port.
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If the TV has no visible RJ‑45 socket, some users force wired‑like behavior via a USB‑to‑Ethernet adapter, but not all TCL Roku models will recognize this, especially if the TV itself does not include an Ethernet profile internally.
If your TV lacks a LAN port, it simply cannot accept a direct Ethernet cable, so the “not detecting” behavior is expected.
2. Verify the physical cable and router path
Even if the port exists, a bad cable or router issue can make the TV seem like it ignores Ethernet.
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Test the Ethernet cable on a PC or laptop
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Plug one end into the router and the other into a computer; if the computer gains internet, the cable and router port are fine.
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Try a different router port or cable
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If the TV still shows no wired connection, swap to another LAN port on the router and try a known‑good Ethernet cable.
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If the computer works but the TCL TV does not, keep reading; if the computer also fails, the issue is router‑ or ISP‑level, not the TV.
3. Make sure the TV is set to “Wired” mode
Plugging in the cable does not automatically switch the TV to Ethernet; you must tell the software to use it.
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Plug the Ethernet cable into the TV’s LAN port and the router’s LAN port.
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Press Home → Settings → Network → Set up connection.
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Choose Wired (Ethernet) instead of Wireless; the TV will then try to detect the wired link.
If the TV runs a test and then says “No Internet” or rolls back to Wi‑Fi, the issue is most likely in the router, router settings, or router‑to‑TV path, not the cable itself.
4. Restart TV and router, then re‑test Ethernet
Restarting the stack often clears temporary glitches that block wired detection.
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Power‑off the TV by pressing Settings → System → Power → System restart, then let it boot up.
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Unplug the router for 60 seconds, then plug it back in and wait for all lights to stabilize.
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After both devices come back, go back to Settings → Network → Set up connection → Wired (Ethernet) and let the TV verify the connection again.
If the TV finally detects the Ethernet and shows a stable connection, the problem was a router‑ or DHCP‑level hang after the TV had already tried and failed to detect the link.
5. Check router and DHCP settings
If the TV never sees the Ethernet link, or it shows “Wired” but then loses connection:
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Confirm DHCP is enabled on the router and that the TV is receiving an IP address.
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Ensure the router does not have MAC‑address filtering or Access Control rules that block the TV’s MAC address (found in Settings → Network → Network status).
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If possible, connect the TV via Wi‑Fi temporarily; if Wi‑Fi works, the router is fine and the issue is either the physical Ethernet port, the USB‑to‑Ethernet driver profile, or the TV’s network stack.
If the TV never responds to Ethernet no matter which cable, router, or DHCP setting you try, the port itself may be disabled by the TV’s firmware or physically faulty.
6. Suspect hardware fault or missing port profile
Across TCL Roku‑TV support threads and user reports:
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Some users with TCL Roku 4K TVs have reported dead Ethernet ports that show no link‑light behavior and never detect any cable, even though the same cable works in other devices.
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In such cases, the port is judged defective, and the recommended path is to contact TCL support under warranty or consider a replacement.
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For older or smaller TCL Roku models, some users report that Ethernet detection is not provisioned at all, even with USB‑to‑Ethernet dongles, because TCL did not build the TV with an Ethernet profile.
If you have exhausted all the steps above (known‑good cable, different router ports, DHCP/MAC‑filter checks, restarts, and correct “Wired” selection), and the TV still shows nothing under Ethernet, the port is either not supported by that model or hardware‑faulty and should be treated as such.
For TCL Roku TV owners in Nairobi or similar broadband cities, using Ethernet in the first place already improves stability; if the TV then refuses to detect it, checking the model‑specific port support and, if needed, speaking with TCL or a local TV‑repair service is the realistic next step.