un4given69
n00b
- Joined
- Nov 11, 2012
- Messages
- 1
My DELL S2740L came this weekend. So if any1 has any questions, i'd be pleased to answer them. I'd like to test it, but aint got any free time now so feel free to ask
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actually tftcentral says they were sent 2 monitors of s2440L. if tftcentral is saying they dont have pwm then the monitors should not have the hardware in them to drive pwm. the driving process would be different.
so i dont understand where does the question of software being written for non existent hard ware driver arise?
your observation suggests that pwm hardware driver is present in the monitor and is being driven with bad regular pwm software which exposes the pwm since you say it is a properly working monitor.
if it is a properly working monitor then it should not have pwm hardware itself, forget the question of software.
that is where i cant make sense of your observations.
Can you describe your issues a bit? The solution could be to use the display in portrait mode. See if that helps.hi all.
i think that I have the answer to why I have had some small tiny problems with my otherwise wonderful dell s2440l!
Here is this wonderful monitor and by the way, i detect no PWM.
the clue came just now when i read the reply from my English lady
pen-pal, from my mail.
I had yesterday told her about my problems and she too has a sensitive system.
she told me that in her Library she will get a splitting headache in an hour, when she uses the Monitors there. "they all are widescreen" she says.
*that*, for me was the "Boing-Boing" of Realization!
in my public library, here in tallahassee, they must have about 65 to 70 computers. Often I go there and use these computers as i have no printer in my apartment or that i am just there and want to look at stuff.
many of these computers systems are old and most are donations.
the monitors also suffer from mis-adjusted settings and user messing-around, too.
but i can look at even an over-bright cffl screen for over an hour and "nothing" happens!! as restful as looking at a wall!
but these are all cffl florescent tube screens!
there is but one Common Denominator.
they all are square 4:3 screens with 4:3 aspect ratio!
NO widescreens.
now I See...pun intended.
the central vision Looks at a scene in front of the eyes. the peripheral vision scans to both sides and makes for a true 3-D image, of something looked at.
but a flatpanel widescreen is forcing the brain to process a 2-D image *as* a 3-D image.
dissonance results!
the brain tries to see this 2-D image as a three dimensional image.
this is not good. the conflict causes a headache and/or a very tired eyes and thus even nausea as the stomach and brain are linked.
the dissonance will make for dizzyness too.
the only physical solution would be to sit far far back from the screen to make that widescreen into a central focus area! this sort of defeats the whole propose of a large monitor!
as the red Indians say about white men and campfires...." white man builds firewood pile three feet high and then sits back 20 feet. we Indians build a firewood pile six inches high and then sit back two feet: we are just as warm as the white man"!
i see it now, in 2015, i have a 27" monitor and sit 15 feet back from it!
I am probably affected by this Condition more than others as i am part Indian and am a bit ADD, the Hunter genes person. I tend to use my peripheral vision probably much more than other people do!
I tend to see effects to one side of my eyes, more than other people. I will notice, for instance, a bird on a branch that is almost that max,
135 degrees, to my side from central focus!
so this is my discovery. I am not sure what i am going to do with this information, though.
none of the crts, as far as i know, are widescreen.
freestone
@syndrome
Are there any other retailers you can order it from? Or did you try Dell directly?
You could try sending an email to Dell asking about PWM, and if perhaps certain revisions have it, or not.
If it was me, I'd simply try to hunt down that same model from a retailer who has a PWM free version. Otherwise, you'll probably never be happy, as you'll always compare contrast/black levels, or something about the original you preferred. Unless you manage to find a similar monitor from a different manufacturer, using that same panel, that is, and without flicker -- but I am not aware of any other VAs (besides supposedly the Dell) that are flicker-free.
Yeah I was going to email them, however I can't get pass the "fill out your serial" because there is NO serial what so ever behind my monitor... i swear... there is no sticker at all anywere. just a REV00 sticker.
edit: i'm gonna scratch the U2312HM off my list... it has FRC = color flicker.
besides the health symptoms how do you test for pwm flicker without a high speed camera?
put it at the lowest brightness and see through a regular camera for flicker?
The "fast moving hand" shows a terrible strobo-effect...
can you guys check which panel is in your S2440L the PWM free panel is M240HVN01 V0 as per tftcentral.
I wonder if Dell may have done a switcharoo, giving PWM free versions to review sites early on, then swapping them back to PWM for mass production.
Or perhaps it is simply certain revisions that are PWM free based on region. It is bizarre if there are two versions of this monitor out there already ... not like it's been released for very long.
I just bought S2240L, its a decent monitor. Movies look real good on it, and seems to handle games without any problem. But sometimes after waking up from power nap, the screen goes black whenever I move the mouse. Rebooting the pc seems to fix it, but its definitely something to look into before I decide to keep it.
what connector and OS are you using?
uh oh i know that one.. saw it on ccfl backlit monitors.
can you guys check which panel is in your S2440L the PWM free panel is M240HVN01 V0 as per tftcentral.
you can check the panel via the factory menu http://josh.st/2008/05/02/dell-2707wfp-lcd-monitor-service-menu/ - hope this method works.
OS: Vista 64 bit
Video Card: XFX 4890
Connector: Hdmi with hdmi to Dvi adapter.
I clean out old the video card driver and reinstall Cat. 12.6, that seem to have fix it. Hopefully there will be no more problems, but only time will tell.
Cant really rag on Dell for being inconsequent with a feature that most people never will notice and its not even an official property of the monitor. Its more of an altruistic move by Dell to have this at all. The reason could be something as simple as they had already produced PCBs with PWM dimming before taking the decision to move to PWM-free design. Could also be that there are not enough of the required new PWM-free electronics components to meet monitor demand.
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