Annoying rectangular on top left part of smart v

[Flofoe]

Hi - all of a sudden I am having an annoying rectangular on the top left part of my Samsung Smart Tv. I tried to plug it off and reset it but it just won't dissapear. Did ony experience this too and was able to reolve it? Thanks in advance!!

[CarlH]

Hi @Flofoe. Can you tell me the model number? Also, does this rectangle appear during a Picture Test? To do this, press Settings/ Menu on the remote and go to Support > Self Diagnosis > Start Picture Test.