Why Is My Lg TV Making a High-Pitched Noise? How to Fix

lg tv making high pitched noise
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When we want to relax, we can turn on the television. It’s also a chance to spend quality time with family and friends while at home.

However, if you are distracted by a strange sound coming from the LG TV, especially if it is high-pitched, you can’t enjoy your movie or series experience.

Let’s look at why such issues happen and how to fix them in this article correctly.

Why Is My LG TV Making A High-Pitch Noise?

lg tv making high pitched noise

Several reasons can cause your TV to make a high-pitched noise. These parts may include:

  • Ferrite Beads in Horizontal Deflection Circuits
  • Deflection Yoke
  • Horizontal Transformer 
  • Sheet Metal and a Magnetic Field
  • Coil
  • Choke

If these parts are in good condition, they do not make noise. However, the noise may also be caused by the following factors:

The TV’s Position and Location

The position of your LG Tv can cause vibration. Check whether the TV is close to a glass panel or thin metal sheets. It’s also possible that the TV shelf has some loose frames.

Third-Party Components

If your TV is connected to any third-party devices or components, the noise comes from one of them. In some cases, removing them can be the solution, and then we can say that the problem is not caused by television.

Interference with loudspeakers You are highly suggested to pay close attention to the loudspeaker. If the noise is coming from it, the cause is something other than mechanical vibration, such as channel noise.

Why does my TV make noise when it is turned off?

You may be wondering why you can still hear a noise from your LG TV after turning it off. For example, you might hear a buzzing or crackling sound for a few minutes.

There are four possible reasons:

1. The Earthing Problem

Earthing devices in plug sockets are uncommon in some countries. The socket helps to absorb the electrical charge in the absence of an earthing device. The charge will release itself, resulting in a popping sound. In this case, install an earthing cable with the tv and check if the noise is still available or not.

2. Defect Power Supply Capacitors

If the high-pitched noise remains after unplugging the power cord, it could be caused by a defective power supply capacitor.

It occurs when the capacitor tops bump. If not, use a capacitor tester to check the capacitors. It will advise you if it is working or if you need to replace it.

3. Background Information Updates

Even when a TV is turned off, as long as the power cord is plugged into an outlet, the TV is still looking for updates, especially with new models.

It looks for connection status and other personalized settings. This background activity could be the source of the popping sound.

To be sure, unplug all external devices from the TV without unplugging the power cord from the outlet. Check to see if the noise can be heard.

4. Parts Expansion and Contraction

For some LG models, the noise that occurs when TV is turned off is normal.

What’s the reason? The plastics and metals inside the television grow when the temperature rises and contract when it cools.

Because of the loudspeaker volume, you may not hear the expansion when TV is on, but the same noise is heard when the TV is turned off.

The device’s expansion and contraction will become less and less listenable as it gets older.

Step-by-Step Instructions for Repairing an LG TV That Makes a High-Pitch Noise

If the basic method of unplugging and plugging does not work, proceed to the steps below.

Do the following first:

  • Unplug your LG TV, wait 30 seconds, and then plug it back in to reset it.
  • Change the video input/channel
  • Check that all audio/video components are correctly connected to the TV. 
  • Disconnect all third-party audio/video components.
  • Remove any non-flammable sound-absorbing materials from the nearby television.
  • Keep the TV away from corners.
  • Remove any non-flammable sound-absorbing material from a nearby area of the TV.

If the noise still remains, follow these steps:

  • Make the disturbing parts out of a dry wooden stick.
  • Use a cardboard tube to listen to parts while pushing them.
  • When the sound changes, the part is most probably to blame.
  • To readjust the part, use a wooden wedge toothpick.
  • Consider wrapping the transformer if the television is old.
  • Replace the flyback transformer if the noise exists.

Why Do Old TVs Make High-Pitch Noises?

Let’s be clear about the term  “LG Old TV,” because it can mean one of two things.

First, do you mean television that has been working for many years? Or a recently purchased television?

In the past, we talked about brand-new LG televisions that made a high-pitched noise.

The noise, however, is gradually getting older as time flies.

Older televisions used a picture tube with a 25KV electrode voltage. To generate such a high voltage, TV manufacturers included flyback transformers.

When it was first introduced, this transformer was mostly heard by children and rarely by adults.

Brief overview

The information above will undoubtedly help you in repairing an LG TV that generates a high-pitched noise.

The complete solution to this problem is right there. Simple and basic steps can be used.

Review specific cases and recommendations if they do not solve the problem.

The final steps will indicate whether you need to change any parts.

At last, the suggestions above are a good starting point for you to find your own better ways.


Ques 1: Could a high-pitched noise indicate a hardware failure?

Ans: A high-pitched sound does not always indicate a hardware problem with your television. On the other hand, an annoying high-pitched noise from the TV could show a hardware error.

Ques 2: The volume of the speaker increases the pitch of the sound. What does it indicate?

Ans: If you have a home theater system or a sound system connected with your TV and the high-pitched noise becomes louder as the volume increases, you must check your connections, including HDMI or RCA, for defects or physical damage.

Ques 3: Is it possible for Damaged TV cables to cause a high-pitched sound on an LG TV?
Ans: Yes. Damaged TV cables will cause signal problems, resulting in a strange buzzing, popping, and high-pitched sounds.

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