Samsung 55inch SmartTV strange artefact

[guix]

Hello, I may be interested in buying a TV that has an intermittent problem. Sorry that I don't know the TV model, yet, all I know is it's a 55 inch SmartTV.

The problem is, sometimes there is a black triangle that appears at the top left corner, and it seems there is also a small vertical bar from the bottom left corner (see the picture), and the tv turns off by itself.

I couldn't find a similar problem here or anywhere in the universe, mainly because I don't really know what to search for.

Any idea what can be the cause of this problem ? Bad motherboard, bad TCON, or bad panel ?

I would say it's a bad TCON but I'm not sure, hence my post here, before I buy this tv and realize it's a bad panel...

Also, just saying, on the previous Samsung SmartTV that I opened (UE49KU6400), there were no TCON board, it was integrated to the motherboard...

Thanks in advance and happy new year!

[CapLeaker]

that panel got a hit

[mmartell]

That artifact is way too geometrical to be a panel hit. I would say toss up between tcon and main board.

[budwich]

well, two things. First, you will notice that you are on "page 2" on this particular setup (sorry my french ain't so good... :-) ). Without the actual model, one can make a guess at a "generic samsung setup". Anyways, looking thru a few videos, I see that the "triangle" is normal... :-) What isn't normal, is that there is no page number. The page number on the right top side should show up in the triangle. The right is kind of a "map" of your "browsing" while the left tells what you are currently looking at.

So your problem isn't the triangle, your problem is the display has a significant issue, possibly brightness / contrast settings. The videos that I saw showed a screen that was more "normal" in terms of "gray scale" like a normal picture "menu".

Based on this, my first guess is the "gamma chip" is "gone". So your "mission" is to find out if indeed there is a tcon board as then you will likely find the chip there... otherwise, you need to look at the main.

[guix]

Yes, as said, the problem is not always! Proof is another picture taken the same day, showing screen working without artefact..

Budwich I don't understand why you say the triangle is normal... but comparing the two pictures, I agree that it seems there is also a problem with the color/brightness.

So you are positive that it's a board problem, it cannot be the panel ? Could it simply be an issue with a connector or ribbon cable?

Edit: now after looking at some pictures on internet, I think there is no problem with color/gamma. For example, see this second picture, it shows the same kind of faded color when there is another overlay menu.

[budwich]

OK... but without the model, I am just going by "random videos" on the net. Without a manual on how to "navigate" the tv, my guess IS really a guess.

You have pictures but not the model number?

further: its possibly that whom ever setup the set has chosen a different background / "wallpaper color" for the menu as opposed to "nothing" or "see thru", etc. The triangle seems to be "flip" from pictures that I saw on the net... it might be like a "cut out corner" as opposed to what you are seeing. Possibly this indicates a timing issue with the menu overlays. Don't know. Need a model number so one can look thru user guides and / or network videos on setups.

[nomoresonys]

Ok, so get the model number from the person, tv shutting itself off is often a mainboard issue/fault.