Why My LG TV HDMI ARC is not working?

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Written By Dinu Sri

Dr H. T. D. S. Madusanka is an electronic expert with 10 years of experience, involved in the research and development of SMART HOME systems.

Are you fed up because your smart TV is not working? There must be some problem with the HDMI ARC since it’s responsible for letting audio transmission to speakers and video on TV. They send compressed and uncompressed stereo sounds through a single HDMI connection. It creates the best surround sound along with a visual display.

When HDMI ARC does not work, you might hear the audio and video splitting. Therefore, I will lend a hand to you in understanding what can cause this issue and how to rectify it. Now, off we go!

What are the causes of LG HDMI ARC not working?

How would anyone solve the problem if they do not know the root cause? Therefore, let’s read through a few issues that might be the reason your HDMI ARC is not working and check for yourself simultaneously:

CAUSE 1: Your devices are not ARC compatible

If the TV is not compatible with the HDMI ARC cable or the speaker system does not support ARC cable, hearing sound and watching video may be impossible to do

CAUSE 2: HDMI Port is faulty

Try out a few things before deciding on the problem, such as checking HDMI port and whether it’s faulty or not. Usually, one can find HDMI ports in laptops nowadays. If the cable works there, then there is a problem with the HDMI port of TV,

CAUSE 3: HDMI cable has a fault

Examine HDMI cable for any faulty behaviour by connecting the cable to any other computer or TV connection. When TV starts playing, then the line is alright, and the port is defective. However, cable has to be replaced when the cable doesn’t work anywhere else.

CAUSE 4: External device output

An external device like a TV may prevent audio from playing on the speaker even though the HDMI ARC is connected because settings are disabled. It is a very common issue in computers as well.

CAUSE 5: HDMI cable is connected loose

The obvious sign of inability of the HDMI ARC not to work is a loose cable connection. When your cable gets flexible, external devices do not receive any intimation from the audio output.

How do I get my HDMI ARC to work on my LG TV?

Let me talk you through some of the possible solutions to the causes we spoke of above:

SOLUTION 1: Ensure that the device is HDMI ARC compatible

Compatibility is the first step you need to look out for to get the HDMI ARC working. Before buying, you should check if the HDMI would support your TV or your sound device.

SOLUTION 2: Check the HDMI port to see if it needs to be fixed

It is quite rare for an HDMI port to get damaged; you will have to replace or repair them. Either way, repairing costs up to $100-200 whereas $200-300 for replacement. Choose for yourself or get a professional opinion before getting it replaced or repaired. 

SOLUTION 3: Check for faulty cables to replace them

As cheap as $20, purchase new cables of the length required according to how those devices are placed. If the sound device is identified with the TV, then a 6Ft cable works. 

SOLUTION 4: Check the setting of the external device

Check if the TV is connected to the sound bar’s output settings by following steps below:

  1. Find settings option.
  2. Click on “system preference” option. 
  3. Now Click on Sound and check for any output sound.

SOLUTION 5: Check if the HDMI cable is tightly connected to the device

Wiggle the cable in the device’s port, or see if the port is clean or not. Also, use a regular brush to clear any excess dust.

Troubleshooting tips and solutions for the HDMI ARC not working

Do you know troubleshooting is probably the first thing you should do when facing such an issue? It helps to understand and find out causes. Understand a step-by-step procedure to get your HDMI ARC to work:

Step 1: Turn on your TV, but disconnect every HDMI cable from the sound device as well as the TV

Step 2: Switch off the devices now.

Step 3: Remove the device connections from the PowerPoint.

Step 4: Take some time off and then reconnect everything with the soundbar and the TV.

Step 5: Now, turn on the power again after connecting everything.

Step 6: Connect the HDMI again after you have waited for some time now.

Step 7:  If it does not work now, check if your CEC settings are enabled on the TV.

Frequently Asked Questions

How do I reset my HDMI port on my LG TV?

  1. Turn down the power connection of all the devices.
  2. Disconnect the HDMI cables.
  3. Turn the TV off from power.
  4. Remove the power cable.
  5. Hold the TV’s power button for about 30 seconds.
  6. Wait for a few minutes and then reconnect the HDMI cables, power cables, etc.

Which is better HDMI ARC or optical?

HDMI ARC is way better as it can support Dolby Atmos, Dolby Digital Plus, and 7.1 uncompressed audio channels. Whereas optical only supports Dolby digital and just 5.1 channels of uncompressed audio.

Which is HDMI or HDMI ARC?

HDMI only transmits visual images, whereas adding ARC to HDMI allows audio transmission from the TV back to the source. In addition, it means that you only need one cable to send audio and video simultaneously at the same time.


Incompatibility is not an issue with us human beings only! So HDMI ARC not working on your LG TV might be because of incompatibility with other devices. I think you can tackle this by inquiring about the compatibility right at the shop.

I also talked about some troubleshooting tips that you can check to see if the HDMI ARC cable is working correctly or if devices need some repair. However, never play too much with technology and consider calling a professional for help if you don’t understand anything.

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