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Samsung TV Brightness Not Working, Flickering, Too High, or Too Low

Because today’s Samsung TVs keep on improving, their TVs now have some of the latest technologies. But some of these new technologies might cause problems with how bright the screen is. The good news is these issues are easy to resolve.

One reason why the brightness on a Samsung TV may not be working is due to a problem with the TV’s Eco Sensor feature. This feature automatically adjusts the TV’s brightness based on the ambient light in the room. If the Eco Sensor is not functioning properly, it can cause issues with the TV’s brightness. To fix this issue, try disabling the Eco Sensor feature in the TV’s settings menu. If this does not resolve the issue, you may need to contact Samsung support for further assistance.

Grandfather, dad and son sitting on sofa watching TV

Read on to understand what might be causing your Samsung TV to have problems with the screen’s brightness and how you can fix it.

Samsung TV Losing Brightness: How Do I Stop My Samsung TV From Auto Dimming?

Male and female sitting on sofa watching TV

Samsung TVs have an Eco Sensor function that’ll be able to tell how bright a particular room is and then adjust the screen brightness for the best viewing experience. As such, when the Eco Sensor is enabled, your Samsung TV’s screen will be darker if the room is dark and brighter if the room is well-lit.

This feature is meant to help you save on electricity costs by turning down your TV’s brightness when it’s not needed. However, if your Samsung TV is automatically dimming and you don’t like how dark the screen gets, then you might want to turn the Eco Sensor off by following these steps:

  1. Go to the Screen Menu and choose System.
  2. Choose Eco Solution and then Eco Sensor.
  3. Toggle it off.

What To Do When a Newer Samsung TV Keeps Dimming Automatically

On newer Samsung TVs manufactured after 2016, a similar technology is used that acts like the Eco Sensor in older models. For Samsung TVs made after 2016, the Ambient Light Detection feature needs to be turned off if you’re experiencing excessive dimming.

To do this, you need to:

  1. Go to Settings.
  2. Choose General and then Eco Solution and then choose Ambient Light Detection.
  3. Click on the slider to turn the feature on or off.

If turning off the Eco Sensor doesn’t work to keep your Samsung TV from automatically dimming, then you should check if you have the power-saving settings off. If it continues to darken, it might be because of pulse width modulation technologies that your Samsung TV uses.

Pulse width modulation will control your TV’s brightness depending on the movie scenes you’re watching. Instead of detecting ambient light in the room, pulse width modulation will tone the brightness down if you’re watching an exceptionally bright scene.

To keep your TV from automatically dimming because of pulse width modulation, you need to:

  1. Go into Service mode by pressing on mute and pressing the numbers 1, 8, and 2. After that, press the power button.
  2. Your Samsung TV will reboot and show you the Service menu, which will show you five items: Option, Control, Debug, SVC, and ADC/WB.
  3. Choose SVC and then select Other Setting
  4. Choose CAL Data Restore. You’ll see a prompt, so just press OK to continue.
  5. Once you’re done, go back to the Service menu, but this time choose Advanced instead of SVC.
  6. Press 0 on your remote control four times until additional items show up on the menu.
  7. Choose Picture_2D and then SubSetting.
  8. Look for PWM Mid and PWM Min and change whatever value it has to 100.
  9. Also, change the value of PWM_MOVIE_INI to 100.

Once you play your movie or watch a show, your TV’s brightness should stay the same throughout, instead of automatically dimming.

Samsung TV Brightness Flickering

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When your TV’s screen is flickering, it might also be a problem with the ambient light sensor or the eco sensor. These sensors will measure the amount of light that you have in the room and will adjust the TV’s brightness to give you the best viewing experience.

A faulty ambient light sensor may cause your TV to constantly adjust the brightness, or worse, make it flicker.

Samsung TV Brightness Is Low / Samsung TV Brightness Too High

Female on white couch watching TV

If your Samsung TV screen is dark, it might be as simple as adjusting the brightness to higher levels. Same thing when the screen is too bright. Or you might want to try changing the picture mode because some modes can make your screen darker.

At its worst, if your Samsung TV is too dark, it might be a problem with the backlights.

How To Increase or Decrease Brightness on Samsung TV

To adjust the brightness of your Samsung TV’s screen, here’s what you do:

  1. Click on MENU on your remote control.
  2. The main menu will appear on your screen. Use the up or down buttons on your remote to select Picture.
  3. Use the up and down buttons to choose Brightness. Press enter and then adjust the brightness level.

On some TVs, you’ll need to go to Expert Settings to find the Brightness setting.

Other Things That You Can Try

Aside from adjusting the brightness of your Samsung TV screen, you can also:

  • Adjust the backlight setting
  • Change the picture mode
  • Replace the backlight

Tweaking the Backlight Setting

Another setting that you should increase or decrease is the backlight setting. Thankfully on most Samsung TVs, this setting is right next to the Brightness setting, so you can just adjust it too when you tweak the brightness.

Changing the Picture Modes

Your Samsung TV will come with several preset modes. When it comes to color accuracy, the movie mode is the most precise one. If you want to play games on your TV, choose the game mode, which registers the lowest lag.

Choosing the standard mode may give you brighter pictures. However, if you’re going to watch a movie, it’s best to do so in movie mode, but that may make your Samsung TV’s screen a bit darker than what you prefer.

To correct this, you can adjust the backlight control and still get the most accurate colors without having to suffer through dark scenes.

Samsung TV Brightness Not Working: Fix It by Replacing Bad Backlights

Male sitting on white couch watching TV

If your Samsung TV is very dim or has no picture altogether, and you cannot correct it by increasing the brightness and backlight settings, it may be a problem with backlights. However, replacing bad back lights might prove to be challenging for most people because it means taking apart your whole TV.

If you want to do it yourself, you should first find out what type of backlights your Samsung TV uses. There are complete sets of backlights that you can buy, such as this set of Samsung Backlights and LED Strips (available on if you have a 55-Inch model.

Samsung TV Brightness Keeps Resetting

Female watching TV

If your Samsung TV’s brightness and other changes you make to the settings keep on resetting and aren’t saved by your TV, then you’re in Store Demo mode. This mode is only for use in shops and appliance stores and is designed to make the TV more attractive than other products that are put beside it.

To turn off the demo mode, there are several methods that you can try. You can do the following steps if you have a newer Samsung TV model:

  1. Click on the Home button on your remote.
  2. Navigate to Settings, General, and System Manager.
  3. Choose Usage Mode, where you’ll be asked to give a PIN. Use 0000 if you have not set a PIN for your TV.
  4. Select Home Mode from this screen.

Other models might require you to go to Settings, Support, and then Use Mode to change the Demo Mode to Home Use.

Older Samsung TV Models

If you have older Samsung TVs with remotes with no Home button, you can choose Tools on your remote control and look for the Store Demo Off item.

You can also use the physical keys on your TV. When your TV is ON, press the Volume button and then hold the Menu button while the Volume indicator is displayed on the screen.

Copyright protected content owner: and was initially posted on June 16, 2021.

This will take your TV out of Demo mode. If you did these steps correctly, the TV would show the word “Standard” on screen.

Samsung TV Uneven Brightness

Female watching TV

For the most part, Samsung says that it might be because of uneven backlighting. This condition can result in clouding, and it’s prevalent when you have a TV with an LCD.

The manufacturer recommends simply turning down the brightness and backlight settings on your TV. Follow the steps in the previous section to do this.

If one side of the screen is darker, you might need to clean the FPC cable or replace the T-con board.

The same problem will also result in ghosting, where you get double images, or the picture has blurry edges.

Copyright article owner is for this article. This post was first published on June 16, 2021.

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ReadyToDIY is the owner of this article. This post was published on June 16, 2021.

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