LG TV 4K 120hz Not Working? Know This First!

If you’ve got LG TV, you may be wondering why your TV is not running at the advertised 120hz refresh rate, if is there anything specific that needs to be done for it, and other similar questions.

Don’t worry, In this article, I will explain what you need to do to enable 120hz, does your LG TV support 120Hz or not, what to do when it doesn’t work, etc.

Note: As LG officially declared 14 of its TVs support 4K 120Hz Dolby Vision, this guide will apply to all of them like C1, CX, C2, B9, etc

So let’s start and before jumping to troubleshooting for the 120Hz refresh rate on your LG TV, let’s take a look at what is the refresh rate, if your TV is present in the compatible list, and how to enable it.

What is Hertz and Why is it Important?

Hertz (Hz) is a unit of frequency, which measures how often a screen changes (updates) in one second. 

A higher Hz rate means that the signal changes more often, resulting in a smoother and clearer picture on the TV. 

This is especially important for action movies, sports, and other fast-moving content like gaming which requires the TV to be able to keep up with the pace of the scene.

Does LG TV Support 4K 120hz?

YearModelFirmware Version (Firmware number may vary by region)Month of update
All LG TV that supports 4K 120Hz Refresh Rate

This means that users who own TV models present in the above list can take advantage of the increased refresh rate to get smoother motion and better clarity when viewing content on their TV.

How to Enable 120hz on LG TV?

LG TV 120Hz Refresh Rate On Connected Xbox One
LG TV 120Hz Refresh Rate On Connected Xbox One

To enable 120hz on LG TVs, you need to change a couple of settings on your TV

  • Disable Power (Energy) Saving Mode.
  • Make sure your TV firmware is up to date.
  • Change the Refresh Rate of your connected device (Xbox, PS5, etc)

Once you get it done, your LG TV will auto-detect the 120Hz compatible content and you do not have to do anything apart from that.

Additionally, you should also put the TV into HDMI deep color from TV settings to enable HDR for optimal picture quality.

LG TV And PS5 120Hz 4K:

The compatible LG OLED TVs can run many games at a high refresh rate. However, when using the PS5 console, it’s important to note that you won’t be able to use the 120hz feature all of the time. 

If you are not playing any 120Hz 4K game or content via the connected PS5 on your TV, you are on a normal PS5 user interface and the UI for the PS5 does not run on this setting, instead, it runs at 60hz.

In order to get your game running on 120hz, you’ll need to set your “preset mode” to “Performance” and open a game that supports this frame rate (such as Call of Duty: Cold War). 

Once done, go back into the Video settings menu and check again, it should now show as being set at 120hz.

LG TV And PC 120Hz 4K:

If you have connected your PC to the TV and it’s not showing a 120Hz refresh rate, you can try to create a custom resolution on your PC and the 120Hz will be detected by the TV.

How To Troubleshoot When LG TV Can’t Get 120Hz?

LG TV Dolby Vision With 4K 120Hz Refresh Rate Support

If your LG TV is not getting 120Hz, there are a few troubleshooting steps you can take to try and solve the issue.

Like, check that your HDMI cables are properly connected to both your TV and device. If they aren’t, connect them securely and try again.

Also, here are some other things you need to know about running 120Hz 4K content on your LG TV and troubleshooting if it’s not working.

Ensure Compatible HDMI Cable Is Being Used

Make sure you are using a High-Speed HDMI cable that is compatible with your TV as well as connected input and is a 2.1+ version. 

Because if you are trying to get 120hz on your LG TV, you need to use an HDMI 2.1 or higher cable in order for the refresh rate to work properly. 

If the cable being used isn’t up-to-date enough it can cause issues and prevent the TV from achieving a 120Hz refresh rate.

Clean HDMI ports

Among the main issues, another possible issue could be the HDMI ports themselves, which might sound silly.

It’s possible that dirt, dust, or other debris has built up in the ports and is preventing a proper connection. 

  • To clean your HDMI port, use a small brush to gently remove any debris from inside of it. 
  • You can also try blowing into the port with compressed air to get rid of any residue. 

Once you have cleaned out your HDMI port, plug in your device again and see if this helps to detect 120Hz.

Ensure 120Hz Settings Are Enabled

Lastly, Here is the solution I found while researching when I had this issue, through this you will be able to play 4K content apart from gaming as well on your LG TV at a 120hz refresh rate.

  1. Under Windows settings, go to “Advanced Display Settings” to adjust the refresh rate.
  2. In addition, make sure that you select HDMI deep color from the TV’s settings so that you can enable HDR and also Chroma 444.

If you are still having trouble with your refresh rate, you can contact the official LG Support for further assistance.


Having a 120hz refresh rate allows for smoother motion on the screen, as well as better clarity when viewing fast-moving objects like in sports or action movies. 

I hope you found it helpful and that you now know which all LG TVs support 4K 120hz, how to enable 120hz on the LG TV, and the troubleshooting needs to be done when it doesn’t detect 120Hz.

To quickly wrap it up for you:

  • Not all content like movies and tv shows can be played on 120Hz.
  • Presently most of the games support 120Hz on both major gaming consoles (PS5 and Xbox).
  • All LG OLED TVs which are manufactured after 2020 support a 4K 120Hz refresh rate.

Frequently Asked Questions

Do Movies and TV Shows Support a 120Hz Refresh Rate?

Generally, movies are shot at 24, 30, or 60 frames per second. Your TV will display the frame rate (Hertz) of your source. 120 Hertz is usually reserved for gaming or special content. 

So if you are watching a normal non-120hz movie or content on your LG TV, and it is not displaying 120Hz, it is because the media content you are watching is shot at a lower frame rate. 

However, if you want to make your viewing experience appear more fluid, some TVs offer software options for smoothing out motion on movies and series which can give them an almost 120Hz look without actually being shot at that frame rate. 

Is 120Hz only for Gaming?

When it comes to 120hz, this is not just limited to gaming. For example, computer screens can also output at 120hz. 

Additionally, some film and video content such as those seen on streaming services are also available in a 120hz format. 

Of course, many games today are built with the capability of being able to display graphics at up to 120fps (frames per second) or higher for an incredibly smooth experience.