How To Connect A Soundbar To An LG TV With An Optical Cable

Norvan Martin
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Nearly all TVs require external speakers or soundbars to sound good. In this article, we explain how to connect a soundbar to your LG TV with an optical cable.

To connect your LG TV and soundbar using your optical cable, connect one end of the cable to the OPT.IN jack or Digital Audio IN (Optical) on the soundbar. Then, connect the other end to the Optical OUT port on your LG TV. Finally, set the soundbar’s source to D.IN.

Connect A Soundbar To An LG TV With An Optical Cable

Connect A Soundbar To An LG TV With An Optical Cable


It is not a difficult task connecting soundbars to an LG TV as the steps below illustrate. It is however important to check whether or not your devices support optical cables.

how to connect lg soundbar to tv without optical cable

Before you move any step, you should begin by identifying the location of the port where you will connect the optical cable to your LG TV. It is easy to spot the LG TV port because it is labeled either “optical”, optical “audio out”, or “Toslink”.  Remember, optical cables are digital cables so look for anything that says optical should be it.

The optical port of the soundbar will appear the same, except that the label will be “Optical Audio Input” instead of “Output.”

To successfully connect the soundbar to the LG TV, follow the steps we have highlighted below:

Step 1: Power The Devices

Begin by powering on the devices by connecting both the LG TV and the soundbar to the wall socket. Make sure the connections are safe and secure.

Step 2: Remove The Plastic Caps From The Optical Cable

Examine the end of the cable to identify the translucent plastic cap that covers the lens. Grip the cap at its very end with your fingers. You should then pull straight back to remove the cap.

Step 3: Connect The Optical Cable To The Devices

Insert one end of the digital optical cable into the digital OPTICAL OUT jack on the LG TV.

Next, take the opposite end of the cable and insert it into a corresponding optical input in your soundbar.

To do this, connect the OPT.IN jack or Digital Audio IN (Optical) port on the back of the soundbar to the OPTICAL OUT jack on the TV using an optical cable like the Digital Optical Audio Cable Toslink Cable.

Double-check the cable connection.

Step 4: Select The OPTICAL Function

Now set the input source to OPTICAL on the TV. Repeatedly press the FUNC button on the remote. You could also repeatedly press the F button on the unit until the function is selected. You could also just select the OPTICAL function directly by pressing OPTICAL on the remote control if it exists.

Step 5: Switch On Both Devices

Once the devices have been connected, switch them on and follow the setup on your LG TV and soundbar.

Choose the digital optical output for your source to hear the sound come out

In case it does not work, go to audio settings and look for PCM settings

Step 6: Set The Soundbar Source To D.IN

Finally, set the soundbar’s source to D.IN


How Do I Connect My LG TV To Optical Audio?

If your TV is successfully connected to the optical cable, follow the steps below to connect your LG TV to optical audio:

  • Press the Home button on the remote
  • Point and click on settings, followed by the sound menu (it has the picture of the speaker)
  • Locate the down arrow and click the Sound setting
  • Select TV speaker, and click on either the right or left arrow to turn off the TV speaker
  • Select the close button to exit

The soundbar connected to your LG speaker should now receive audio signals from the TV through the optical cable.

Is It Better To Connect Soundbar With HDMI Or Optical?

Although the differences between the two types of soundbar cables are subtle, they are worth considering.

Whereas both cables offer awesome quality audio experiences, the HMDI soundbar allows for both video and audio signals between devices, making them a better option particularly when used in conjunction with your TV Blu-ray player, game consoles, and much more.

This, therefore, means that fewer HDMI cables are needed to connect your devices.

On the other hand, a digital optical cable produces reliable and consistent audio, making it slightly better than an HDMI cable.

Optical cables use a pulsing wave of light to relay audio signals from a source to a receiving device. Since they only relay audio, it goes without saying that you will need to have some additional cable to relay video and images between your devices.

What Is An Optical Output On A TV?

The optical jack is designed to output audio especially when you are watching a type of video with digital audio. This feature is not supported on the standard cable. It is therefore only available on particular digital broadcasts such as smart TVs and soundbars.

When Would You Use An Optical Cable?

A common question people ask is, “Do I need optical audio if I have HDMI?”

Optical cable transfers only digital audio signals, while HDMI supports both audio and video signals. However, if your device does not support HDMI, then an optical audio cable is a good way to transfer audio between the devices.

The cable also allows you to play compressed DTS or Dolby Digital 5.1 surround and uncompressed stereo audio. Another common use of optical cables is to connect the TV to hi-fi sound systems or soundbars, as well as wiring CDs to an amplifier.

What Soundbar Is Compatible With An LG TV?

The sound quality emanating from your LG TV internal speakers may be less impressive than expected, but if paired with the best soundbar, the problem is sorted. Not all Soundbars will complement your LG TV speakers. Some of the best soundbars are:

1. Polk Audio Signa S2

Key features include:

  • Dolby Digital decoding
  • For 4K and HD TVs
  • Polk Adjust Technology

2. LG SN6Y

Key features include:

  • 1 channel soundbar
  • Virtual surround sound
  • High resolution

3. LG SL5Y

Key features include:

  • 1 channel
  • 400 watts of total output power
  • External subwoofer

Do Soundbars Have To Match With TV Brands?

The devices don’t need to match. Moreover, if for some reasons like single remote syncing, matching sound features, and design compatibility, then matching the devices is worth looking into.

Whereas many manufacturers recommend buying more of their products, keep in mind that many of the best soundbars aren’t always affiliated with brands that produce TVs.

What Should I Do When LG TV Optical Output Is Not Working?

Sometimes, your soundbar may fail to produce sound even after performing a successful connection as we have described above. Here are some of the ideas to troubleshoot your connection.

Place your audio device close enough to the TV you are connecting and follow the steps that follow below. Please note that the optical cable port may be protected by a spring-loaded door or a removable plastic plug.

Step 1: On your remote, press Home, then choose Device Connector.

Step 2: Select the type of device you are connecting.

Step 3: Choose the port you want it connected to.

Step 4: Select the type of connection you want your TV to use for the Audio output. Please note that at this step, your TV prompts you to change your sound settings, select YES.

Finally, in addition, you can connect your soundbar to your TV using AUX. If you are wondering which option is better, check out our article on optical vs AUX for connecting your TV.

Another option is to use Bluetooth. However, if you have an older TV, you can resort to using RCA. Check out our article on how to connect your soundbar to your TV with a red and white cable.

What is LG Sound Sync Optical?

The LG TVs have a Sound Sync option, which is a computer software adjustment for synchronizing pictures and sound.

For example, perhaps you noticed that the movements of the actors’ mouths didn’t match the voices in a video. Sound Sync should be used to synchronize video and sound here.


To wrap things up, hooking up a soundbar to your LG TV through an optical cable is straightforward and boosts your sound quality. We’ve laid out easy-to-follow instructions to get you going, and we’ve pointed out that optical cables are dependable for transmitting clear sound. You don’t have to stick with the same brand—most soundbars work with LG TVs just fine. If something goes wrong, it’s often enough to just double-check your plugs or fiddle with the audio settings. In the end, whether you go for optical, HDMI, AUX, or Bluetooth comes down to what fits your situation best, because they all have their perks for cranking up your TV’s sound.

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Norvan Martin is the founder of He is a professional Electronics Engineer and is passionate about home theater systems and AV electronics. BoomSpeaker was created as an online hub to share his knowledge and experiences as it relates to home theaters and home audio electronics. My email: [email protected]  Connect on Pinterest and Linkedin