How to Troubleshoot and Fix a Humming TV

Last Updated: May 19, 2023By
TV turned on

Television provides entertainment, news, and a connection to the wider world. However, like any other piece of technology, TVs are not immune to experiencing issues.

One of the most common, yet often overlooked problems, is a humming sound that emanates from the TV. This seemingly insignificant issue can significantly diminish your viewing experience, and if left unchecked, may lead to more serious problems over time.

The humming sound from your TV can occur due to various reasons such as electrical issues, speaker problems, or transformer issues, among others. Understanding the cause of the problem is the first crucial step towards resolving it.

We will walk you through the basic troubleshooting steps, provide specific solutions based on different causes, and guide you on when it might be best to seek professional help.

Understanding the Causes of TV Humming

Before we get into the specifics of troubleshooting a humming TV, it’s important to understand what causes this phenomenon. TVs are complex devices with many moving parts and electrical components, all of which can generate noise under the right (or wrong) circumstances. Here are the primary culprits:

Electrical Issues

One of the most common causes of a humming TV is electrical in nature. This often happens when there’s an electrical ground loop in your setup. A ground loop occurs when there are multiple paths for electricity to ground, causing an unwanted loop of electrical current.

This creates a low, steady hum, often referred to as a “ground loop hum”. Another electrical issue can be due to electrical interference from other devices or appliances, which can cause the TV to hum.

Speaker Problems

The speakers in your TV can also be the source of humming. If the speaker is damaged or failing, it might produce a persistent humming or buzzing noise. In addition, problems with the audio signal, such as a low-frequency oscillation, can cause a humming sound.

Transformer Issues

Every TV has a built-in power supply transformer that can sometimes be a source of humming. The transformer’s job is to step down the power from the outlet to a usable level for the TV’s components. When these transformers start to fail, they can vibrate, and this vibration can translate into a humming sound.

Different Causes, Different Humming Sounds

Not all TV hums are alike. The type of humming sound you hear can give you clues about what’s causing it. Electrical issues tend to produce a steady, low-frequency hum.

Speaker-related humming might vary with the volume or program content, while transformer issues often create a constant hum that doesn’t vary much over time. Being able to differentiate these sounds can be a useful diagnostic tool.

The Risks of Ignoring a Humming TV

While a humming TV might seem like a minor annoyance, ignoring it could potentially lead to larger problems down the line. For instance, a hum caused by electrical issues could indicate a problem that might damage other components over time.

A humming speaker might be on the verge of failing completely. Transformer issues could potentially even lead to safety risks if they result in an electrical short or a fire. Therefore, it’s crucial to address the issue promptly.

How to Diagnose a Humming TV

Once you understand the potential causes of a humming TV, the next step is diagnosing the issue. This can be a process of trial and error, but with patience, you can pinpoint the source of the problem.

Isolating the Sound

The first step in diagnosing a humming TV is to locate the source of the sound. Is it coming from the speakers or the back of the TV where the power supply is located? Or is it a more general hum that’s hard to locate?

To do this, turn on your TV, get close to it, and try to listen where the hum is the loudest. Use your hand to feel for vibrations on the casing of the TV as they could provide clues to the source of the humming.

Determining if the Issue is Internal or External

Once you have located the source of the hum, the next step is to determine whether the issue is internal or external. An internal issue is something wrong with the TV itself, while an external issue could be related to other devices connected to the TV, the electrical supply, or the environment.

To check this, disconnect all external devices from your TV, including HDMI cables, antenna, or any streaming devices. Then, turn on the TV to see if the humming continues.

If the humming stops, then the issue is likely related to one of the disconnected devices or the connections themselves. If the humming continues, the issue is likely with the TV itself.

The Role of Professional Diagnostics

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While these steps can help you identify common causes of a humming TV, there are times when the problem might be more complex or less obvious. In such cases, it might be necessary to call a professional.

Technicians have specialized equipment that can better diagnose the exact problem with your TV. They also have a depth of experience and knowledge that allows them to recognize and resolve issues more efficiently.

Remember, if you’re ever in doubt or uncomfortable performing these diagnostics, it’s always best to seek professional help.

Basic Troubleshooting Steps for a Humming TV

Now that you’ve identified the source of the hum and whether it’s internal or external, you’re ready to begin troubleshooting. Here are some basic steps to address the common issues that might be causing your TV to hum.

Turn Off and Unplug the TV

Before you start any troubleshooting steps, it’s important for your safety to turn off and unplug the TV. This prevents any potential electrical shocks and gives the TV a chance to reset, which can sometimes solve the problem.

Check and Secure All Connections

Loose or faulty connections can sometimes cause a humming or buzzing sound. This includes connections to external devices like game consoles or DVD players, as well as internal connections within the TV itself.

Check all external connections first, making sure they are secure and that the cables are not damaged. If you feel comfortable doing so and it doesn’t violate your TV’s warranty, you can also remove the back panel of the TV to check the internal connections. Look for any loose wires or components and, if you spot any, secure them.

Test With Different Inputs and Cables

Try connecting different devices to your TV, or try using different cables. This can help determine if the hum is caused by a specific device or a specific cable. If changing the device or cable eliminates the hum, then you’ve found your culprit.

Try a Different Power Outlet or Surge Protector

Electrical issues in your home can cause a humming sound. Try plugging your TV into a different power outlet, or try a different surge protector if you’re using one. If this solves the problem, the issue might be with your home’s electrical wiring or the surge protector itself.

Safety First During Troubleshooting

As you perform these steps, remember that safety is paramount. Never handle electrical components while the TV is plugged in.

If you’re unsure about anything, consult with a professional. Taking the time to troubleshoot properly and safely can prevent potential injuries and further damage to your TV.

Specific Solutions Based on Causes

Once you’ve identified the potential cause of the humming sound in your TV, it’s time to look into specific solutions. Each cause comes with its own unique set of remedies.

Fixing Humming Caused by Electrical Issues

Ground Loop Isolators

If you’ve determined that a ground loop is the source of the hum, a ground loop isolator can be an effective solution. These devices are designed to break the ground loop, cutting off the path of the unwanted current that’s causing the hum.

Use of Power Conditioners

If your TV is suffering from electrical interference, a power conditioner could help. Power conditioners can filter out noise in the electrical line and provide a clean power supply to your TV, reducing or eliminating the hum.

Addressing Speaker Problems

Adjustment of Sound Settings

If the hum is emanating from the speakers, check your TV’s sound settings. If the bass, treble, or balance settings are at extreme levels, they could be causing the hum. Reset these settings to their default levels and see if the hum stops.

Speaker Replacement

If adjusting the sound settings doesn’t work, the speakers may be faulty. In this case, the speakers will need to be replaced. This can be a DIY job if you’re confident and the TV is out of warranty, but in most cases, it’s best to hire a professional.

Tackling Transformer Issues

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Replacement of Transformer

If you’ve pinpointed the transformer as the cause of the hum, it may need to be replaced. Replacing a transformer is a technical job and should be done by a professional technician. Don’t attempt this on your own unless you have the necessary expertise, as it can pose safety risks.

Repair Options

Sometimes, a repair may be possible depending on the exact issue with the transformer. A professional technician can examine the transformer, determine the problem, and decide whether a repair is a viable option.

Remember, while these solutions can be effective, they require a clear understanding of the underlying issue. When in doubt, always consult with a professional. Your TV is a valuable device, and it’s important to approach its repair with care and consideration.

When to Seek Professional Help

While do-it-yourself solutions can be effective for common issues, there are times when professional help is not just preferred, but necessary. Recognizing when you’re out of your depth is crucial for ensuring your TV is properly repaired and further damage is prevented.

Identifying When the Problem is Beyond DIY Capability

Even with careful diagnosis and troubleshooting, some TV issues can be complex and difficult to solve without specialized knowledge or tools. If you’ve tried the solutions outlined above and the hum persists, or if the cause of the hum is unclear, it may be time to call a professional.

Additionally, if your TV is still under warranty, attempting to repair it yourself could void the warranty. In these cases, it’s always best to contact the manufacturer or your warranty provider.

Importance of Professional Repair for Complex Issues

Professionals have the training and equipment to safely and effectively repair televisions. This includes isolating and repairing internal components, addressing complex electrical issues, and replacing speakers or transformers.

Trying to tackle these complex repairs on your own can lead to further damage, potential safety risks, and could ultimately be more expensive if you need to replace your TV.

How to Find a Trusted Professional or Service Center

Finding a reliable professional is crucial. Here are a few tips:

  • Check for qualifications and experience. Look for professionals who specialize in TV repairs and have a good track record.
  • Ask for recommendations. Check online reviews or ask friends and family for their recommendations.
  • Verify warranty service. If your TV is under warranty, contact your warranty provider or the manufacturer for authorized service centers.

By seeking professional help when necessary, you can ensure your TV is in good hands, extending its life and maintaining its performance.


Humming in your TV can be a persistent nuisance that not only detracts from your viewing experience but could also signify more serious problems if left unattended. Understanding the potential causes, from electrical issues and speaker problems to transformer issues, is the first step towards finding a solution.

Through careful diagnosis and applying appropriate troubleshooting steps, many common issues can be resolved. However, remember the importance of acknowledging when a problem may be beyond DIY solutions. In these instances, seeking professional help is vital.

In this comprehensive guide, we’ve equipped you with the knowledge you need to silence that irritating hum. However, every TV and situation can be unique. Always remember to put safety first when troubleshooting and don’t hesitate to reach out to professionals when needed.

As you move forward, you’ll not only improve your current viewing experience but also enhance the longevity and performance of your TV. Armed with this information, you can ensure that your next encounter with a humming TV will be handled with confidence and efficiency.