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CrossOver 27Q LED/LED-P, 27M LED, & 2720MDP GOLD LED Monitor Club - Page 134

post #1331 of 6485
cool, it'll be a few weeks before I'm able to afford to order anyway so I'll keep an eye here and see what people are saying

I've seen a lot of people mention AW as being the best alright, the paid return is a great option when you're dealing with shipping to korea.. puts the mind at ease a bit
post #1332 of 6485
Quote:
Originally Posted by lazyMaks View Post

Maybe someone from the owners of the new 2720MDP (without Backlight setting in OSD) has a calibration equipment and can measure the change of contrast level with a decrease in brightness?

I have a colorimeter (i1 display pro) and a revised 2720MDP. Decreasing the brightness affected the brightness, black level and slightly affected the gamma when lowering it. Contrast remained stable, around 850-950:1 across all ranges of brightness. I used HCFR to play around with the settings to try and achieve the best results with the OSD before profiling.

Increasing the contrast in the OSD raised the contrast to around 1050:1 but caused bleaching and greatly reduced the gamma. Decreasing the contrast raised the gamma to around 2.22 with a contrast setting of 40, but reduced the contrast to around 500:1, which looks horrible. After calibration the contrast was 850:1 @120cdm/2 (Gamma 2.22, colour temperature 6500k).
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post #1333 of 6485
Quote:
Originally Posted by MenacingTuba View Post

I have a colorimeter (i1 display pro) and a revised 2720MDP.
...
You have 2720MDP with pivot or non-pivot version?
post #1334 of 6485
Non-pivot. I have some youtube videos with the 2720MDP and the Samsung S27A850D if you are interested.

http://www.youtube.com/user/240hzTeIaStorm/videos

This one has the best info

Edited by MenacingTuba - 6/25/12 at 12:33am
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post #1335 of 6485
I just noticed in the comments of that video: "I didn't send it back, it just stopped flickering once I screwed the DVI pins in very tightly"

Can you elaborate more on the flickering? Want to see if it's similar to mine.
post #1336 of 6485
Quote:
Originally Posted by LC155 View Post

I just noticed in the comments of that video: "I didn't send it back, it just stopped flickering once I screwed the DVI pins in very tightly"
Can you elaborate more on the flickering? Want to see if it's similar to mine.

I'm just about to order one, and was looking into the same issue. He has a youtube video of the flickering at http://youtu.be/WSJjrql5RU8?hd=1

It's clearly caused by a bad signal (imo), and not the backlight. Interestingly enough, there are a few videos on youtube about 27" iMacs that have the same issue. Considering they use the same panels, the root cause is probably the same. Almost all of them were uploaded two years ago.

From what I gather, yours has an actual backlight problem?
post #1337 of 6485
For my flickering issue, I tried two different dvi cables, well inserted, with no improvement. Also tried a different power brick. I saw it at all brightness levels when it happened.

I don't think it's a common defect, however, as there would be more posts about it. Very occasional, looks like.
   
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post #1338 of 6485
Quote:
Originally Posted by ElevenEleven View Post

For my flickering issue, I tried two different dvi cables, well inserted, with no improvement. Also tried a different power brick. I saw it at all brightness levels when it happened.
I don't think it's a common defect, however, as there would be more posts about it. Very occasional, looks like.

Very interesting. When this happened to you, did the luminosity just jump around (no noise/artifacts on the screen, like the ones on MenacingTuba's video)?

Sometimes increasing the brightness gets rid of backlight flickering (when it's PWM related), but like you said, it didn't help in this case.
post #1339 of 6485
It was pure brightness / luminosity fluctuation - no artifacts, no color shifts. It was like backlight jittering. Increasing or decreasing brightness did not trigger it, and it was apparent at all brightness levels. The flickering began gradually and increased in intensity to become visible after maybe 15-30 minutes (I only tested for a day and a half, so didn't establish the period too accurately). Basically it wasn't there when cold-booting and then began after some time on. The full effect wasn't extremely prominent, but if you were reading a web page, it was definitely there, causing slight lines and swirls of brightness/darkness in your line of sight.
   
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post #1340 of 6485
my 27Q led-p arrived today, everything is ok
no stuck or dead pixels
but i have brightness flickering issue
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