Sometimes our gadgets – TV, Phones, Computers, etc., act up – let’s just say they get tired too. And it can get frustrating and tiring, especially when it starts disrupting whatever you are watching or doing.
In some cases, you start hearing a humming or buzzing sound coming from your TV and, in rare cases, computer. This does not mean your TV has wholly gone bad. However, it indicates that something is wrong, and there are some quick fixes for these problems.
There are a couple of reasons why your TV might be emitting a humming or buzzing sound. This article will be reviewing the causes of why your TV is humming or buzzing. And it will be recommending some simple fixes for these causes.
Causes and Solutions to TV Buzzing and Humming Sound
Several reasons might be causing your TV to hum, and fixing these issues are pretty straightforward.
However, it is essential to note that there is no one-fit solution to TV humming or buzzing issues. So, it is crucial to know the exact cause to use the most suitable solution.
Below are ten possible causes of TV humming/buzzing and how to fix them:
1. Ground Loops
Generally, if your TV is experiencing a ground loop issue, there is a difference in the voltage between the two grounding points. That is, the wall outlet where the TV is connected might have a different electrical capacity.
If an electrical ground loop causes your TV humming issue, it means multiple connected devices are plugged into more than one socket.
So, for instance, if you connect your cable box, TV, DVD player, etc., using different extensions to different wall outlets, you will likely hear a buzzing sound.
To fix this issue:
- Connect your power extension to a single wall outlet at a time
- You can install an in-line ground loop isolator between your TV and peripherals.
2. Faulty Speaker
All TVs come with an in-built speaker, and like every other component in a device, these speakers can develop faults. The most prominent issues with TV speakers range from excess moisture to physical wear.
You can troubleshoot the TV by muting the volume. If the sound is no longer audible, then the issue is with the speaker.
With a faulty speaker, hearing a buzzing or humming sound from your TV should not come as a surprise. However, fixing this issue is straightforward and below is how to go about it:
- Connect the TV to an external audio system – this will automatically disable the faulty internal speaker and stop the buzzing sound.
Alternatively, you can change the speaker with a new one. It is advisable to allow your local TV installer/repairer to handle this to avoid electric shock or damage to the TV.
3. Poor Ventilation/Temperature
Usually, not a humming sound, more like a popping noise or a crackling sound could be due to temperature change or poor ventilation around the TV.
With poor ventilation or temperature change, the TV may expand or contract slightly. This contraction depends on the temperature change, and it can lead to a crackling sound. To solve this issue:
- Position your TV in a well-ventilated area to allow adequate airflow
- Mount your TV on the wall instead of placing it in an enclosed cabinet
4. Wrong Backlight Setting
When it comes to appliances and devices, settings can mar or make your final output. Your TV might just be emitting a humming or buzzing sound due to a wrong backlight setting.
To troubleshoot this, observe if there is any humming sound from the TV when the backlight is close to 100%. Although the sound is usually soft and lower, it can become disturbing if there is an issue with the power inverter responsible for backlighting.
To resolve this issue, you will have to adjust the backlight level of the TV. Below is how to go about it:
- Using the TV Remote Control, press the Home Button
- Go to Settings
- Click on Picture Settings
- Then select Backlight Settings
- With the Remote, adjust the Backlight Setting using the Up or Down arrow
It is important to note that while some TVs emit the humming sound when the backlight is 100%, others produce the sound when the backlight is below 100%. Regardless of either of the differences above, the process above will fix the issue.
Almost all smart TVs have an RF modulator. An RF modulator is a device that converts video and audio signals from peripherals such as cable boxes, VCR satellite receivers, DVD players into TV signals.
And once these signals are too strong for the modulator to handle, it causes overmodulation. It will distort the video and sound of whatever is playing on the TV. To solve this issue, you can either;
- Install an attenuator between the TV receiver and the peripherals – this will help lessen the signal strength and stop the humming sound
- You can replace the peripheral with a more recent model
6. Unstable Audio Volume
Using a digital receiver or a cable box with external volume controls can cause your TV to hum if the audio is unstable.
Also, if your TV volume is higher than that of the receiver or cable box, it might cause your TV to hum. In the same light, if your receiver or cable box volume is too high, it might also cause your TV to hum. To fix this:
- Turn down your TV volume while slowly raising the volume of your receiver or cable box to find a balance.
The goal is to ensure that the volume of both devices is not too low or too high. In addition, ensure that all the audio cables are in the right input and output lines.
7. Faulty Cooling Fans
Most large TVs feature cooling fans and vents that help prevent the TV from overheating. Also, it helps the TV to maintain its ideal working temperatures.
However, if there is an obstruction to these fans and vents or they are faulty, it could cause your TV to produce a humming sound. To resolve this issue:
- Clear the cooling vents by dusting them regularly
- Also, ensure that there is enough space around the TV to ease airflow
8. CRT Scanning
Although not very popular, however, if you still use a Cathode Ray Tube (CRT TV), you should be aware of the humming or buzzing sound that comes from it.
A CRT TV works by shooting electrons from the CRT to the screen when scanning frequencies. When scanning, the TV emits a low humming sound.
Unfortunately, you have to get used to the sound since it is almost inaudible. Alternatively, you can replace your TV with an LCD TV if the sound is unbearable.
9. Electromagnetic Interference
Mostly, electromagnetic interference happens when other electrical appliances in the home, such as computers, radios, Bluetooth speakers, etc., interfere with the frequency signals of your TV.
This interference can disrupt how your TV functions, hence causing the TV to produce a humming sound. To fix this issue:
- Move any electronic device, metal object, wireless frequency devices, etc., that could disrupt your TV frequency from the TV.
- Also, ensure that all auxiliary cables linked to the TV are not tangled with each other.
10. Power Cycle/Factory Reset
Doing a factory reset or power cycle is one of the most prominent fixes for most issues with TVs.
So, if your TV starts producing a humming sound, you can try power cycling your TV or doing a factory reset. Below is how to do a power cycle on your TV:
- Power off your TV
- Unplug it from the wall outlet
- Long press the power button for about 30 – 60 seconds
- Plug back the TV to the wall outlet
- Power on the TV
If power cycling does not fix the issue, you can try doing a factory reset by following the step below:
- Power on the TV
- On the TV remote, press the Home Button
- Navigate to the Settings Menu
- Select Device Preferences or Storage and Reset
- Then click on Factory Reset
Note that performing a factory reset will erase all your downloaded data on the TV. However, it is a sure fix for tons of TV issues.
With our simple solutions above, you can get rid of the irritating humming and buzzing of your TV.
However, if none of the above solutions works, it is time to get the TV to a repair person or contact the TV brand customer service.