What is this stain inside my display?

"fredkrughoff



Rep: 37




1"

"Can you give the display a rest for a week or so, where it isn't being used at all?

I've had this same exact problem, a creeping something on the right side of the LCD. It has even grown over time.

But today I plugged in my Cinema Display after a week or so of not using it, and the crud is gone. After about half an hour it still isn't visible."

"After a couple of months I bought the Cinema Display 27 second hand I started noticing the same streak / stain on the screen. I decided to open it up and tried different things like cleaning the LCD assembly, air blow the fan, or change the kapton tape in the back of the LCD asssembly but only to find out that none of this was the problem, as no dust or condensation were found (i cleaned it like 3 or 4 times with isopropyl and a microfiber cloth that came with my LG TV, and the process was a pain in the ass).

Then I noticed that this mark was very noticeable after a couple of hours of use when the display was hotter because it gets get hot, but it gets even hotter when it’s been used intensively, like watching a movie or playing a game, so I totally discarded the dust / humidity option apple has been giving.

The way I somehow managed to work around this problem was:

Charge my computer with the Macbook charger, not the display, as it used to get hotter where the power supply its located. I remembered that during the first couple of months I didn’t have this problem (or at least I didn’t notice) because I was waiting for the magsafe to magsafe 2 adapter to arrive, so the problem basically started when I started charging my macbook with the integrated cable in the display.Disconnected every USB peripherals in the back. I had it crowded, like the 3 usb ports were used, my iPhone, a little usb fan and numeric keypad. I know it might seem like its not too much, but every watt counts to avoid the display getting hotter.Put a fan directed to the vents of the display in the right side. It is a mini fan, with AC, not USB powered. It keeps it cool by constantly blowing air inside the display.

At the moment the stain / streak is there, but is definitely less noticeable and the display rarely gets hotter again, just regular hot / warm. I know that this also might be a problem of the fan, I’m waiting for a replacement, but right now they’re not really easy to get where I live, so I guess I’ll have to wait and try that.

Another thing I read is that maybe some of the LCD diffusers might be slightly burnt or damaged, but I don’t know if its even possibly to repair.

I hope it works for you.

X"

"The dust, which makes the display cloudy actually is at the back of the LCD panel and on the backlight panel. It is possible to remove the aluminium panel case and open the LCD assemble. I used cotton cloth and a mixture of ethanol and denaturalized water (1:4) to clean those panels. Tricky it is, as there is glue and tape and magnets which try to confuse you. If you are careful and bring some engineering talent with you it is no big deal. Try to not bend cables, everything else is quite robust.

good luck!

Rob

www.silveronglass.com"

I used to have the same water stain on my Thunderbolt Display. It was huge. Today I just realized that the stain (that was clearly visible) is gone. Can’t tell how it went away. My guess is that my screen saver did not start one night and the display was on for a full 12 hours on a white web page. Maybe that’s what repaired it. Anyway.