Why are there coloured blocks on my Samsung TV screen?

Last Update Date : Apr 24. 2018

Why are there coloured blocks on my Samsung TV screen? 








If you are seeing coloured blocks in your picture the problem may be caused by a weak signal or an excessively strong signal. This issue is usually related to the received RF broadcast digital signal (or received satellite signal).


You can check the received signal strength and quality in the Support menu on the television. The ideal signal strength should be somewhere between 40%-80% and the signal quality should be reading zero errors or as near to zero as possible.

If the signal strength is low please check that your antenna has not moved or become damaged. If you are using an antenna amplifier make sure the connections, coaxial cable, and power cable are all in good condition.

To increase signal strength and hopefully reduce or completely remove such picture imperfections you can:



  • Attach an in-line amplifier
  • Use the Auto Tune function and re-tune if your problem is with over-the-air digital channels 
  • Use the Fine Tune function if your problem is with over-the-air analogue channels


If your signal strength is too strong then you will need to fit an inline signal attenuator. These come in various strengths in steps of 3dB, and can be used in any combination to achieve the desired signal strength. These can be purchased from any reputable antenna installer and from electronics retailers.


Note: if you have satellite TV you may be able to improve reception by adjusting your satellite dish. See the user's manual of your satellite dish or digital set-top-box for instructions, if possible, or contact your satellite TV provider for further details.


Attaching an in-line amplifier

You can try attaching an in-line signal amplifier (also called an RF amplifier or a signal booster) to the cable connecting your antenna, cable wall outlet or cable box to your TV. Amplifying the signal will often improve the picture. In-line amplifiers can be purchased from electronics retailers.



Using the Auto Tune function (for over-the-air digital reception)



Try auto-tuning your TV again. It may improve the signal and reduce or eliminate the picture problem(s). Follow these steps to do so:


If using the Smart Touch control:


1. Turn on your TV.


2. Press the MORE button.


3. Using the Touchpad - Slide Lefttouch pad to navigate on the virtual remote control on screen to highlight the MENU button icon and then press the centre of the touch pad.


4. Highlight Broadcasting and press the centre of the touch pad.


5. Highlight Auto Tuning on the list and then press the centre of the touch padPress the centre of the touch pad again.


6. Highlight Start and then press the centre of the touch pad.


7. When the auto tuning has finished press and hold the RETURN button to close all the menus.

If using the standard remote control:

  1. Turn on your TV.
  2. Press the MENU button on your standard remote control.
  3. Press the top Up or down Down navigation buttons on your remote control to select Broadcasting and then press the Menu ENTER button

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