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Flickering red pixels on 60 Hz FHD monitor

fr483
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Dear all,
Since a couple of years, I'm experiencing a problem with my Samsung S22D390 HDMI+VGA monitor (TN panel, FHD).


The issue was randomly occurring (maybe occurring for few days, then not occurring anymore, then again for a week, and so on), until a few weeks ago, when it occurred again (in a quite noticeable way) and, this time, did not go away.

The issue is the following: as in the attached picture, I basically get flickering red pixels in correspondance to certain kind of colors (mostly green, red and brown), which sometimes are more evident, sometimes a bit less.
This issue occurs both if I connect the monitor via HDMI to my main desktop PC, and if I connect it to another, older, PC via VGA.


I tried changing the cables and testing with multiple devices, but the flickering red pixels were still there. I noticied that I can reduce their intensity if I change the monitor settings (e.g., reducing contrast), but that's not really a solution as I would need to keep very bad contrast and color settings to (mostly) avoid the issue.
I also noticed that if I reduce the update frequency from 60 Hz to 50 Hz the problem seems to be solved (but again I don't see it as a valid solution, as it requires to keep a sub-optimal refresh rate - also, a friend of mine has a monitor of the same model and he has no issue at all with the standard 60 Hz update frequency).

 

As I use this monitor both for work, gaming and a bit of photo editing, this issue is starting to become a bit annoying.

 

Do you know why is this occurring? Could it be a faulty logic board?

Thank you very much in advance.

Red_pixels_issue_S22D390.jpg

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Is it always the exact same pixels that show up as red? If yes, most likely faulty pixels. 

MOBO: ASUS ROG STRIX Z490-G GAMING (Wi-Fi) | CPU: Intel Core i7-10700K @5GHz + Corsair H100x | GPU: ASUS ROG STRIX RTX 3080 Ti OC LC @2.1GHz | RAM: G.SKILL TridentZ RGB @3700MHz, CL16-16-16-36 | SSD: Samsung EVO Plus 1TB, Samsung EVO Plus 1TB, Crucial MX500 2TB, Crucial MX300 1.05TB | PSU: Corsair HX1200i | CASE: HYTE Y60 (White/Black) MONITOR: Samsung Odyssey G9 @5120x1440p, 240Hz, Samsung CRG9 @5120x1440p, 120Hz

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21 minutes ago, BetteBalterZen said:

Is it always the exact same pixels that show up as red? If yes, most likely faulty pixels. 

No, they are not fixed. They always correspond to certain kind of colors, but, for example, if I move an image showing up with the flickering pixels over the screen, these pixels move with the image (as shown in the attached short video).

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6 minutes ago, fr483 said:

No, they are not fixed. They always correspond to certain kind of colors, but, for example, if I move an image showing up with the flickering pixels over the screen, these pixels move with the image (as shown in the attached short video).

Ah, roger that, I understand. Your video does not work though but your explanation made perfect sense. 

Well since it happens with two PC's, using two different cable types, this must mean the monitor is faulty but that goes without saying... 

MOBO: ASUS ROG STRIX Z490-G GAMING (Wi-Fi) | CPU: Intel Core i7-10700K @5GHz + Corsair H100x | GPU: ASUS ROG STRIX RTX 3080 Ti OC LC @2.1GHz | RAM: G.SKILL TridentZ RGB @3700MHz, CL16-16-16-36 | SSD: Samsung EVO Plus 1TB, Samsung EVO Plus 1TB, Crucial MX500 2TB, Crucial MX300 1.05TB | PSU: Corsair HX1200i | CASE: HYTE Y60 (White/Black) MONITOR: Samsung Odyssey G9 @5120x1440p, 240Hz, Samsung CRG9 @5120x1440p, 120Hz

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