DELL Ultrasharp 2408WFP Shadows

[nukie]

My 2408 has been doing this for quite sometime already, same rightside shadow. it went through quite a lot of hours, I don't plan to do anything to it unless it gets worse.

Not just DSLR optics but generally all camera lens, fungus attack the multicoating. Give it some UV once a while.

[tom66]

I've seen this with quite a few LCDs, it is called Mura, named after the Japanese word for "unevenness" (I believe)

There are two types.

Type A - This is caused by the LCD panel de-laminating and typically looks like a large blob-ish region of darker pixels, a smudge of sorts.
Type B - This is caused by the backlight diffuser layers becoming contaminated with moisture or dirt. The effect is often random and looks almost as if the panel is dirty but cannot be cleaned.

Personally it looks like type B... this may be fixable but it is involved as you will have to take the panel apart. And there is a risk you will break it in the process.

[hgg]

@nukie
That explains it...   It might be a common problem with these.
Were did you buy yours?  I bought mine from Germany, ebay.

@Tom66
Thank you for the info.  As you describe it it does look like type b, but I find it difficult to
see how it got contaminated.  It is been used in a clean and dry environment.
I've seen the layering in other LCDs and there is a lot of space for disaster if you try to
disassemble them.  Do you think that it might be just a case of contamination in between
the layers?  (I am very curious now to open it and see what' s going on  )

When I heated the affected region with the heat gun on around 100 degrees Celsius,
the shadows disappeared.   Can this happen if the mura is of type A?

(Mura in Greek are called all types of berries like blueberries etc...  )

Thanks.

[nukie]

I bought it direct from Dell. If I apply pressure around the area I can see it heal.

[hgg]

Maybe its a different problem because if I apply pressure it becomes even darker.
It only gets better if I heat it.

[Shock]

Turn off the monitor, then clean your screen so this next part doesn't leave scratches.

Use a microfiber cloth (with another cloth loaded inside it if you need to) to form an even pad a couple of inches wide. Applying an even (but not screen breaking) pressure, rub from the center of the screen evenly to the outside of the edge which has the problem. Do this several times then check if it improves.

If this fails then detach the LCD screen from the diffuser and clean both inside sides with an antistatic cloth, and alcohol if required. It's also possible to replace the polarization film on the inside of the LCD but if bonded you need to use several pieces of tape and some dowel to slowly roll it off evenly. Then prep and apply a replacement.

Of course do all this at your own risk.

 

[hgg]

Hi,

I've just tried your suggestion.  No results.  When you press it it gets darker but when you release
it returns exactly as before.  (I tried with the monitor off as well)  The only thing that worked was
the hot air which fixed the problem for half an hour.

I am curious now to see what the actual problem is.  I think I will have to open the panel...

[Shock]

Static build up between the diffuser and the LCD panel is my suspicion, there might be some kind of growth however causing it. I wouldn't expect the lighting to put out that much of a definitive pattern and you can remove the diffuser and hold it up to light if you need to check it anyway. You just need to be ultra careful pulling it apart if you want to ever reassemble it.

If it was polarization film coming off I would expect it to look more uniform. But since you mention heat fixes it have you seen this?

[hgg]

That was the video I saw, but when I applied something cold, the shadows got even worse!
So I said lets try the heat gun, but I was happy only for 30 minutes.