Question thin black vertical line on my samsung TV (goes away on white background)

[whiteknights]

I'm using my samsung 32 inch tv as a pc monitor, when i decided to update my graphics card driver it turns out that the driver was corrupted or something, after that i started to notice a thin light black vertical line on my TV, it appears on a certain background colors like yellow, blue, brown.. but on a white or dark colors background it disappears..

the weird thing that i used an app named DPT it makes the screen opens different backgrounds colors at full size, i opened the app for a minute started playing with the colors, at yellow, brown, blue the thin line still there, at white and black its gone, i returned again to yellow, brown and blue its also gone! i close the app and the thin line disappeared even from my desktop! great.. but after a while it returns again and i have to open that app again to get rid of it, and so on.. i made sure that its not from my GPU its the TV itself that have the issue.. any explanation please??

things i tried:
- repluged my HDMI cable
-changed my HDMI cable
-powered of my tv and unplugged the power cord for a while
-played with my tv settings like aspect ratio, resolution, etc..

 

[Aeacus]

i made sure that its not from my GPU its the TV itself that have the issue..

If so, then best to contact Samsung and ask them. Could be that one vertical pixel line is on it's way out.
Maybe it is covered under warranty.

 

[helpstar]

faulty board or panel of TV