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On the cited LG OLED G4 and C5 models, you can connect a console or PC to any of the four HDMI ports for 4K at 120Hz gaming. The exception is HDMI 2 if it is already being used for a soundbar or receiver: that is the eARC port, so connect the gaming device to one of the other inputs instead.
Which port should you use?
For the LG G4 and C5 examples covered here, all four HDMI inputs support 4K 120Hz gaming. The port number does not improve picture quality on these models, so choose an available input that leaves HDMI 2 free for eARC if your audio setup needs it.
LG says all four HDMI ports on its listed G4 support HDMI 2.1 bandwidth of 48Gbps, allowing consoles, PCs and home-theater equipment to connect simultaneously. That specification applies to the listed G4 model, not every LG OLED TV. LG G4 product specifications
Why HDMI 2 may need to stay available
On the cited G4 and C5 models, HDMI 2 is the eARC input. If a soundbar or AV receiver is connected there, plug the console or PC into HDMI 1, 3 or 4. If you do not use eARC, HDMI 2 can serve as a gaming input like the other ports on these examples.
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LG’s UK C5 listing identifies all four HDMI ports as supporting 4K 120Hz and lists eARC, VRR, ALLM and QMS. LG C5 product specifications LG’s US G4/G5 specification sheet also identifies HDMI 2 as eARC and lists four 4K 120Hz-capable inputs for the sizes covered by that sheet. LG G4/G5 specification sheet
Check the exact TV model before connecting
These all-four-port examples do not establish the port layout for every LG OLED generation, size or regional variant. Look up the full model number on the LG support or product page for your country, or consult the TV’s manual. Confirm the supported resolution and refresh rate for each input, as well as which input provides eARC.
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Do not rely on the label “HDMI 2.1” alone to infer every capability: LG notes that VRR maximums vary by model and directs customers to local specifications. On the UK G4 listing, LG gives VRR maximums of up to 144Hz for the 55-, 65-, 77- and 83-inch sizes, and up to 120Hz for the 97-inch size. These are TV specification maximums, not a guarantee that a particular game or connected device will run at that rate. LG G4 product specifications
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The TV’s port specification is only one part of the connection. Check that the source device supports the target mode and that the existing cable and settings allow it. LG’s product specifications describe the TV inputs; they do not establish whether a particular console, PC or cable will deliver 4K 120Hz in your setup.
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- Confirm the exact TV model’s input specifications and use an input that supports the target mode.
- Check the console or PC’s video output settings and the game’s available display modes.
- If the link still will not provide the target mode, consider trying an Ultra High Speed HDMI cable. A new cable is not automatically necessary; first check the cable and equipment already in use.
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