Are you an owner of a Panasonic TV that keeps dimming when you’re trying to watch something?

You may not be aware of the ‘Ambient light control’ on your Panasonic, or there could be a backlight issue with the hardware of your television.

Certain settings can be adjusted to fix your Panasonic if your TV is going lighter and darker.

With that being said, we have generated this simple guide for you to use (and keep), to assist you with the dimming issue on your Panasonic.

We will help you understand why the problem has occurred, and what you can do to get rid of it.

Why is my Panasonic TV Picture dark?

Why does my Panasonic TV keep dimming

Why does my Panasonic keeps dimming

The picture on your Panasonic TV is dark because the ambient light control setting has been enabled. Your image will be too dark if your display settings have been configured incorrectly. 

A few other reasons why your Panasonic TV is too dark include;

Reason 1. Faulty HDMI cable

If your Panasonic TV has an HDMI cable that is damaged, this can interfere with the lighting on your TV, and cause it to become sporadic in its illumination.

Reason 2. Backlight issue

If your Panasonic has a backlight issue it will disrupt the brightness settings and cause disruptions.

This could be due to internal components of your Panasonic TV that are damaged.

Reason 3. Panasonic’s configuration is incorrect

If your display settings are incorrect, this can interfere with the brightness of your screen.

Further settings like ‘Sleep Mode’, ‘Picture Mode’ and ‘Power Saver Mode’ can automatically change how dark your screen becomes.

How do I stop my Panasonic TV from dimming?

Why does my Panasonic TV keep dimming?

How to stop dimming on Panasonic TV

You can stop your Panasonic TV from dimming by changing your display settings.

Fix 1. Update picture mode

Step 1. Using your remote click on the ‘Menu’ button

Step 2. Access the ‘Picture’ tab

Step 3. Select ‘Picture Mode’

(Your TV’s default setting will be ‘Standard’ if you have not previously changed it.)

Step 4. Change your picture mode to ‘Custom’

Note, you can try ‘Cinema’ mode if you would like which one is better suited for you.

Turn your TV off and on again to confirm if this fix has stopped your screen from changing its brightness.

Fix 2. Turn off ‘Ambient Light Control’

(also known as C.A.T.S, Contrast Automatic Tracking System)

Step 1. Get onto the ‘Picture’  tab

Step 2. Scroll up until you get to C.A.T.S and click on it

Step 3. You will now be able to turn it ‘Off’

Restart your Panasonic after you have made this adjustment.

Fix 3. Amend backlight setting

You can change the backlight setting on your Panasonic, however, if there is a hardware issue with your TV, this change will not fix the dimming issue.

Step 1. Click on the ‘Menu’ button

Step 2. Access the ‘Picture’ tab by pressing ‘OK’

Step 3. Find and select ‘Back Light’

Step 4. Change this to suit your preference

Check to see if your Panasonic’s brightness fluctuates.

Fix 4. Check HDMI cables

If the HDMI cables connected to your Panasonic TV are damaged, or the ports contain too much dust, this will interfere with your TV’s display.

Check your HDMI cables by changing them to a different port, or swapping your cable for a different one.

Fix 5. Turn power saving mode off

If power saving mode is enabled, your Panasonic will automatically dim or switch itself off. (This is generally after 4 hours).

If this function is faulty, it can turn your Panasonic black before it reaches 4 hours.

Step 1. On your remote, press the ‘Menu’ button

Step 2. Scroll down and click on ‘Timer’

Step 3. Change ‘Auto Timer’ to ‘Off’

You can always enable your power saving mode again once you have rectified Panasonic from dimming.

What does a bad backlight look like?

If you have tried these fixes on your Panasonic TV, and the screen is still dimming, this could be because the electrical circuit is damaged, or you have a power supply issue.

(Interesting Fact: Panasonic came about in 1918, and during World War 2, they manufactured electronic parts such as light fixtures, motors and irons.) 

How do you know if your backlight is damaged? 

A bad backlight will look like this;

  • Your Panasonic screen will get lose its brightness over time
  • The screen will start to flicker
  • Your image will flash and go dark

Can a backlight be fixed?

Yes, you can fix a faulty backlight.

You can check if the problem is from a faulty power supply by using a different plug point to connect your Panasonic TV.

If this does not rectify the issue, the problem is either due to a burnt-out bulb that will need to be replaced, or there is damage to the internal components of your TV, which will need to be fixed by a professional.

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With your Panasonic screen no longer dimming, you can enjoy watching your favourite TV shows, and access your online streaming services with a distinct, bright image displayed for you to see.

If you have attempted each of our fixes, and you are still witnessing your Panasonic TV display a brightness issue, we suggest you contact Panasonic directly.

You can call them on (+44) (0)344 844 3899 or speak to a live agent by using their online chat service. (There will be a blue box on the page you can click on).

Panasonic’s operating hours for their support team are Monday – Friday, 09:00 am – 17:00 pm.

Please note, you can no longer post letters to the Panasonic headquarters in the UK because their offices are no longer open.