LG TV Brightness Keeps Changing (Easy Fixes)

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If you have a newer LG TV, your can notice that the brightness on your TV will can sporadically.

There are numerous reasons why your LG TV brightness may be changing, we will cover some of the most common reasons and how to resolve the issues.

On newer LG TVs and especially OLEDs, there is an auto-brightness feature built into the device as a burn-in presentation mechanism.

How do I stop my LG brightness from changing?

Here are the most common reasons:

  • You have the APS (Auto Power Saver) picture setting selected
  • You are using your LG TV as a monitor
  • You have a faulty HDMI port
  • Bad HDMI Cable

We will take you through some steps to help eliminate the changing brightness issues.

Step 1: Disabled APS

The Auto Power Saver mode can reduce the brightness on LG TVs in order to save energy consumption.

It detects the lighting in the room, so if the room is too bright, it will dim the screen.

Disabled APS (Newer LG TV Models)

To disable APS on newer LG models.

  • Settings button (On remote)
  • Picture menu
  • Change from APS mode
LG auto power save

Scroll through the different picture options but do not have APS selected to stop the brightness from changing.

Disable Energy Saver (Older LG TV Models)

To disable the energy saver mode on older LG TV models is easy

  • Settings button (On remote)
  • All Settings
  • Picture Menu
  • Energy Saver (Set to off)
LG TV, disabled energy saver option to stop brightness changing

Step 2: Update your LG TV software

It’s a good idea to update your firmware to ensure that software issues aren’t causing the intermittent brightness issues.

Updating your LG TV firmware can also help resolve other issues such as an LG TV showing a purple-tinted picture.

Keeping the LG TV software up to date can assist you in preventing some issues that appear over the lifespan of your TV.

Most LG TVs have automatic updates enabled by default, the updates should install automatically presuming that your TV is connected to the internet.

It is possible, even with this setting enabled that updates can be missed or an installation can be interrupted and thus cause issues with your TV.

Older LG firmware or a partial software installation could be causing the brightness-changing screen problem.

We strongly recommend that you update your LG TV firmware to ensure that you have the latest software, access to new apps, and an improved viewing experience.

Ultimately, regular updates improve your viewing experience and give you better security & privacy protection.

How to update your LG firmware

Assuming your TV is already turned on, hit the settings button on the remote.

LG remove the purple tint using your LG TV remote

Now you will see the setting menu appear on the left-hand side of the TV (Please note that this may vary depending on the model of your LG TV).

At the bottom of the row of icons, you should see the all settings button. Please select this option to proceed to the next menu.

Now navigate down to “SUPPORT” on the new menu that appears and then select “SOFTWARE UPDATE”

Now you can activate the automatic update feature and also check for new updates.

LG auto update menu

Once the updates have been installed, restart your TV to see if the LG brightness issues has been resolved.

Step 3: Change your selected input device/source

You should confirm whether or not the brightness issue is caused by an external device.

You can change the input device or source by pressing the corresponding button on the LG remote as shown in the image below.

LG remote source / input button

Once you have pressed this button you are shown a list of available inputs.

Inputs are the devices that are connected to your LG TV. This could be a DVD player, Cable Box, Firestick .etc

You should navigate through all of your inputs to see if the brightness issue persists when you change through the different inputs.

If the brightness issues are present on each port, it would suggest that the problem is coming from your LG TV unit.

If you can limit the brightness issue to one external device or port, then you should investigate the settings for the device attached.

You may also want to switch that device to another port so that you can rule out an I/O or port malfunction.

What is an input device I/O issue?

I/O stands for input/output – it generally refers to the different ports on your TV like, HDMI, DVI, DisplayPort, USB.etc.

It is not uncommon for a port to become damaged or unusable after prolonged use or an extended period of plugging and unplugging cables into the same port.

I/O Input issue example:

The brightness issue is only present on HDMI 2.

This would suggest that you have a damaged HDMI 2 port or a bad HDMI cable.

Contact LG Support

If none of our tips have helped in resolving the LG TV brightness changing issue, then it might be time to consider contacting LG support as you may have a defective TV unit.

LG may be able to advise you of other things to try or help diagnose the route cause of the issues.

I would strongly recommend contacting LG before you consider any other fixes that may invalidate your warranty or cause further damage to your LG TV.

Conclusion – LG TV Brightness Changing

When you have an LG TV that keeps changing the brightness, it is annoying but it very rarely means that you have a broken TV.

Most of the fixes for the LG TV Brightness changing can be found in the settings menu.

A few tweaks to your TV settings and you will usually resolve the issue.

We hope these tips helped you!

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