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EvilZardoz
37 Posts
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26586
July 31st, 2005 12:00
2405FPW lagged response - is this panel a lemon?
Howdy all,
A great screen at a great price. Except it's very annoying to use.
When I move the mouse on a screen, I expect the screen to respond straight away. My 2405FPW does not - I would estimate approximately 1/10th of a second lag between when I move the mouse and when the mouse pointer decides to move on screen.
This doesn't happen on my Dell notebook's internal LCD. It doesn't happen on an external CRT (Dell P1130) on the same video port at the same res. If I connect the screen to DVI or AGP to any other machine, the problem is also there.
In short - it is a problem with the panel. No amount of throwing third party hardware at it shows one instance of the problem vanishing. I also get the problem when running the panel at 800x600.
Got one? Try this: get two screens - whether it be a flatpanel or a CRT as your secondary. Connect them both. Move a window around. Notice how your 2405FPW updates considerably later?
This is frustrating in games. This ticks me off even further when using my PC casually. Do I have a lemon or is this a design flaw?
947
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Posted August 3rd, 2005 11:00
Jesse,
I have two panels which exhibit this problem - tested on *five* systems. I find it hard to believe that five of my graphics cards are incompatible with the Dell panel. As I said, I have compared it on the same video outputs from the same video cards side-by-side with other screens. I have tried analog and digital. The lag is introduced as part of the image processor in these panels it seems.
I understand your assumption that it is the video card. The delay is only marginal and I understand it if you were not to experience it (I have had countless people tell me I need to purchase a Radeon X850XTPE to have the panel perform properly, however an Apple or Sony panel of the same specifications seems to behave just fine on the cards I have used).
The delay is also present when used with my PowerBook G4. It's not obvious after about half an hour of use - till I go back to using either its internal display or the Samsung 172X.
FYI, I have tested it on the following:
* Inspiron 8200, Geforce4MX 440 VGA output (variety of resolutions)
* P4 3Ghz HT with Radeon 9800 Pro (1920x1200, DVI and VGA)
* PowerBook G4 1.5Ghz with Radeon Mobility 9700 - 1920x1200, 1280x854, 1024x768 - simultaneous and standlone mode.
* P4 3Ghz with integrated Intel 865G integrated graphics, VGA out, 1920x1200
* AthlonXP 2500+ with Radeon 9800 Pro, Geforce 6600GT (variety of resolutions).
I have tried single mode and dual head, even tried swapping the inputs around (eg, swapping the primary and secondary screens' positions on the video card). No amount of testing can convince the panel to drop its processing delay.
Did I mention that I have two? One was purchased for an associate of mine and also exhibits this delay, however he cannot pick it but I can - clear as day. I took a short video comparing the Dell panel to another and the Dell panel is consistently two frames behind that of the other panel.
My video cards work fine with the Apple Cinema Display and the Sony PremierePro 23" LCD (both LG-Philips S-IPS based) and they do not exhibit any such lag issues with these panels even with the idential settings. The Dell panel itself (i.e. the LCD produced by Samsung) doesn't blur or ghost and for all intents and purposes the panel is fantastic, however a 30ms. Unfortunately I don't own one - however I have tested these screens on my own hardware in the last week and are noticably faster in responding - they feel like a real screen when in use.
I can also confirm that other people have discovered the same problem (compared with a 30ms(!!) LCD!: http://www.hardforum.com/showthread.php?t=900484&page=1&pp=20 - this link was uncovered after a Google search upon discovering the delay problem.
Unfortunately calls to technical support (here in Australia, they are directed to Malaysia via a drop-out-prone VoIP link) have been unresolved and I have been unable to talk to a technician who is fully experienced with these screens. Ideally, I would love to have a chat with the designers to work out what could be causing the issue.
I would dearly love for this problem to be resolved as everything else about the screen (colour reproduction, price etc) is light years ahead of the competition, purely because this panel is current technology, not older tech like the LG-based Apple and Sony panels. Unfortunately this does not appear to be possible.
I have made arrangements to proceed with the return of the panel early next week if I cannot resolve the issues by then.
947
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Posted August 6th, 2005 02:00
I too would like an answer. It may not seem like a problem. Heck, evidently some people don't notice it. But to others, it is big.
And it's widespread, too. I know mine is going back if it's not resolved.947
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Posted August 8th, 2005 07:00
Enter Factory mode.Set ISP Mode Off.One frame delay(16.7ms) will disappear.947
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Posted August 8th, 2005 07:00
What exactly is this ISP mode and what does it do? I can enable or disable it with absolutely no effect on the delay time.947
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Posted August 8th, 2005 10:00
Same here. No change in the delay.947
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Posted August 8th, 2005 21:00
Insert Surplus Picture
This is efficient 1920x1200 mode(no scaling) only.
Perhaps you can't recognize 16.7ms delay.
Another solution.
http://forums.us.dell.com/supportforums/board/message?board.id=dim_monitor&message.id=47652
947
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Posted August 9th, 2005 05:00
How do you get to the screen with the ISP Mode section? I did the power-on while holding the Enter/+ buttons and I see Samsung in my menu now, with V1.9, shows bandwidth used now as well but no options in here that I can see for ISP mode...947
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Posted August 9th, 2005 09:00
Tried that. Still the same problem. ATI cards are affected, too. Intel integrated video is affected on analog as well. My MAC is also affected..... i.e. it's the panel. Mine is running 1.8 and is almost two weeks old.To get into the factory menu, go to 'factory reset" and there should be a fourth optiond down the bottom of the menu called "factory". Select that. Bingo.381
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Posted August 11th, 2005 07:00
Inspiron 8500 wuxga clone.ISP off and on.Compare 602(off) to 751(on).OSD,PIP,PBP and Zoom don't affect results(delay).602 - 16.7ms delay (my setting - one picture buffer delay)751 - 33.3ms delay (default - two picture buffer delay)
Jesse L (retired)
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17898 Posts
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947
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Posted August 1st, 2005 16:00
EvilZardoz,
Thank you for using the Dell Community Forum.
The problem is not the monitor but, possibly the video card.
Jesse L (retired)