You cannot see the raw Ethernet port speed (like “10/100 vs 1 Gbps”) directly in the LG TV’s menus, but you can infer the limit by checking your internet speed over the wired connection and comparing it against your router’s capabilities. For most LG Smart TV models, the built‑in Ethernet port caps at 100 Mbps, even if your router supports 1 Gbps.
Step 1: Confirm your model’s rumored port speed
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Research your exact LG model (for example, OLED55C2, 43UQ7500, etc.) on forums or spec‑discussions; many users report that LG OLED and 4K models are limited to 100‑Mbps Ethernet, even if the Wi‑Fi can run faster.
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If your model is listed as having a 10/100‑Mbps LAN (no “10/100/1000”), your Ethernet will be capped at about 100 Mbps max.
This gives you a quick “paper” limit before you test.
Step 2: Run a speed test over Ethernet on the LG TV
To see how close your wired connection actually gets to that limit:
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Connect the TV via Ethernet
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Plug the Ethernet cable into the TV’s LAN port and the router.
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Go to Home → Settings → Network and confirm the connection type is Wire (Ethernet).
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Use Netflix or YouTube “Stats for NERDS”
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Play a video in the Netflix or YouTube app.
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During playback, open the player’s Settings (usually the gear icon) and look for “Stats for NERDS”.
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That screen shows the current network bitrate; if it maxes out around ~90–100 Mbps, your Ethernet port is almost certainly capped at 100 Mbps.
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Optional: browser‑based speed test
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Install the Browser app from LG Content Store.
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Open it, go to a speed‑test site like speedtest.net and run a test while the TV is on Ethernet.
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If wired peaks near 90–100 Mbps while Wi‑Fi on the same TV reaches higher, that confirms the LAN port itself is the bottleneck.
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Step 3: Cross‑check with your router
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Log into your router admin page and check the port statistics for the TV’s wired connection.
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If the router shows 100 Mbps or 100/Full on the TV’s LAN port, the TV itself is negotiating 100‑Mbps Ethernet, not 1 Gbps.
If the router shows 1 Gbps or 1000 Mbps on every other device but still only 100 Mbps for the LG TV, that confirms the TV’s Ethernet port is designed with a 100‑Mbps ceiling.
Step 4: What to do if the limit is 100 Mbps
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For 4K streaming (Netflix, YouTube, Showmax, etc.): 100 Mbps is usually enough, so the limitation is not a problem for watching; the benefit of Ethernet is stability, not speed.
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For very high‑bitrate local streaming (4K Blu‑ray rips, etc.): you may need to stream from a device (PC, NAS, or set‑top box) rather than routing everything through the TV, because the 100‑Mbps pipe can become saturated.
If you absolutely need more than 100 Mbps over a wired link, some owners use a USB‑to‑Ethernet gigabit adapter plugged into the TV’s USB port; this can push speeds closer to 300–400 Mbps depending on the USB version and adapter quality, though it is not a standard feature and may not work on all LG models.