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Thread Tools | Display Modes |
#1
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Fuzzy display on SyncMaster 710T
I have a Samsung SyncMaster 710T attached to my PC via the digital input.
I have recently reinstalled Windows. When I boot up, sometimes (not always) the display gets distorted and becomes fuzzy and jittery. This didn't used to happen before I reinstalled Windows. I always let my PC equipment warm up by switching on the mains power and only then switching on the equipment about 20-30 seconds later, so any capacitors/PSU gets sufficiently charged (if I don't do this then my PC freezes with S.M.A.R.T. failures, even though S.M.A.R.T. is disabled) . I have looked in device manager and tried to update the drivers (see below) but no newer ones were found. Any ideas about what might be causing the fuzzy distortions? - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Windows XP Home, SP3, fully patched/updated Intel Pentium 4 CPU, 3.01GHz, 3.00GB RAM Devices: Samsung SyncMaster 710T/701T, SyncMaster Magic, CX713T/CX710U (Digital) - Driver Provider: Samsung - Driver Date: 03/01/2005 - Driver Version: 1.1.0.0 - Driver Singer: Microsoft Windows Hardware Compatibility Publisher Radeon X300 Series - Driver Provider: ATI Technologies Inc. - Driver Date: 22/02/2005 - Driver Version: 6.14.10.6517 - Driver Singer: Microsoft Windows Hardware Compatibility Publisher |
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#2
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Fuzzy display on SyncMaster 710T
gargoyle60 wrote:
I have a Samsung SyncMaster 710T attached to my PC via the digital input. I have recently reinstalled Windows. When I boot up, sometimes (not always) the display gets distorted and becomes fuzzy and jittery. This didn't used to happen before I reinstalled Windows. I always let my PC equipment warm up by switching on the mains power and only then switching on the equipment about 20-30 seconds later, so any capacitors/PSU gets sufficiently charged (if I don't do this then my PC freezes with S.M.A.R.T. failures, even though S.M.A.R.T. is disabled) . I have looked in device manager and tried to update the drivers (see below) but no newer ones were found. Any ideas about what might be causing the fuzzy distortions? - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Windows XP Home, SP3, fully patched/updated Intel Pentium 4 CPU, 3.01GHz, 3.00GB RAM Devices: Samsung SyncMaster 710T/701T, SyncMaster Magic, CX713T/CX710U (Digital) - Driver Provider: Samsung - Driver Date: 03/01/2005 - Driver Version: 1.1.0.0 - Driver Singer: Microsoft Windows Hardware Compatibility Publisher Radeon X300 Series - Driver Provider: ATI Technologies Inc. - Driver Date: 22/02/2005 - Driver Version: 6.14.10.6517 - Driver Singer: Microsoft Windows Hardware Compatibility Publisher The monitor has DVI and VGA inputs. It also has the ability to pivot the display 90 degrees and run in portrait mode. It appears to be about a six year old design. http://www.amazon.com/Samsung-SyncMa.../dp/B00025O7RA If you were using VGA, I'd switch to DVI-D and see if the problems go away or not. VGA would involve an analog to digital conversion step, and also involves sync signal processing. DVI still has processing steps, but might not exhibit as many phenomenon as VGA can. (VGA can get ghosting, if the cables are the wrong impedance. DVI gives colored snow, if the cables are too long. It's easier to get a good DVI setup, than a VGA one, as you can never entirely eliminate VGA signal degradation.) This is an example of an X300 with a DVI connector (at top). But they also made some, with only the VGA connector on them, so there is no guarantee you got a DVI connector on yours. http://techreport.com/r.x/ati-pcie/x300.jpg You have to be a little careful with DVI cabling. If you're buying a cable, make sure it fits on both ends. If the video card has DVI-I and the monitor has DVI-D, you could use a DVI-D to DVI-D cable. http://en.wikipedia.org/wiki/File:DV...ctor_Types.svg Paul |
#3
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Fuzzy display on SyncMaster 710T
On Sun, 30 Jan 2011 12:50:24 -0500, Paul wrote:
gargoyle60 wrote: I have a Samsung SyncMaster 710T attached to my PC via the digital input. The monitor has DVI and VGA inputs. It also has the ability to pivot the display 90 degrees and run in portrait mode. It appears to be about a six year old design. http://www.amazon.com/Samsung-SyncMa.../dp/B00025O7RA If you were using VGA, I'd switch to DVI-D and see if the problems go away or not. VGA would involve an analog to digital conversion step, and also involves sync signal processing. DVI still has processing steps, but might not exhibit as many phenomenon as VGA can. (VGA can get ghosting, if the cables are the wrong impedance. DVI gives colored snow, if the cables are too long. It's easier to get a good DVI setup, than a VGA one, as you can never entirely eliminate VGA signal degradation.) This is an example of an X300 with a DVI connector (at top). But they also made some, with only the VGA connector on them, so there is no guarantee you got a DVI connector on yours. http://techreport.com/r.x/ati-pcie/x300.jpg You have to be a little careful with DVI cabling. If you're buying a cable, make sure it fits on both ends. If the video card has DVI-I and the monitor has DVI-D, you could use a DVI-D to DVI-D cable. http://en.wikipedia.org/wiki/File:DV...ctor_Types.svg Paul Yes, I am using the DVI input using original the DVI cable supplied with the LCD unit. Despite its age, it has always been a reliable monitor, so I'm guessing the recent fuzziness has something to do with my reinstallation of XP. I have checked and all the correct drivers are installed. If I switch off the monitor and then switch it back on again, the display resolves to normal clear view and the fuzziness disappears. |
#4
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Fuzzy display on SyncMaster 710T
gargoyle60 wrote:
On Sun, 30 Jan 2011 12:50:24 -0500, Paul wrote: gargoyle60 wrote: I have a Samsung SyncMaster 710T attached to my PC via the digital input. The monitor has DVI and VGA inputs. It also has the ability to pivot the display 90 degrees and run in portrait mode. It appears to be about a six year old design. http://www.amazon.com/Samsung-SyncMa.../dp/B00025O7RA If you were using VGA, I'd switch to DVI-D and see if the problems go away or not. VGA would involve an analog to digital conversion step, and also involves sync signal processing. DVI still has processing steps, but might not exhibit as many phenomenon as VGA can. (VGA can get ghosting, if the cables are the wrong impedance. DVI gives colored snow, if the cables are too long. It's easier to get a good DVI setup, than a VGA one, as you can never entirely eliminate VGA signal degradation.) This is an example of an X300 with a DVI connector (at top). But they also made some, with only the VGA connector on them, so there is no guarantee you got a DVI connector on yours. http://techreport.com/r.x/ati-pcie/x300.jpg You have to be a little careful with DVI cabling. If you're buying a cable, make sure it fits on both ends. If the video card has DVI-I and the monitor has DVI-D, you could use a DVI-D to DVI-D cable. http://en.wikipedia.org/wiki/File:DV...ctor_Types.svg Paul Yes, I am using the DVI input using original the DVI cable supplied with the LCD unit. Despite its age, it has always been a reliable monitor, so I'm guessing the recent fuzziness has something to do with my reinstallation of XP. I have checked and all the correct drivers are installed. If I switch off the monitor and then switch it back on again, the display resolves to normal clear view and the fuzziness disappears. Being digital, eliminates some styles of defect (VGA analog cable reflections, or sync detection problems). The old TV sets suffered from all manner of sync problems (flipping, whack the side of the set and so on). With digital interconnect, most of that kind of thing should be gone. Even when DVI is suffering from transmission errors (colored snow on screen), it takes a lot to lose sync. I don't think it's this (PVP). As far as I know, making the display fuzzy on purpose, started in Vista or later. Vista and Windows 7 not only have the Protected Video Path, there are also provisions in the video driver to detect certain kinds of tampering. I don't know if this is well documented anywhere, but I run into the odd complaint that aligns with the notion (like a monitor with DisplayPort and HDMI, the DisplayPort ends up fuzzy, the HDMI doesn't). When two digital paths don't behave the same, it's fun to blame software for it. http://en.wikipedia.org/wiki/Protected_Video_Path http://msdn.microsoft.com/en-us/libr...66(VS.85).aspx At the display level, the signal fed to your monitor is progressive scan. And that rules out some of the refusals to sync, that you might see on an interleaved display. If your monitor has 6 bits per pixel, instead of 8 bits per pixel, the LCD panel uses "temporal dithering" to create intermediate colors. This sometimes leads to "banding" on the display, if not done well. I don't know if a malfunction in such a feature, would lead to a fuzzy picture or not. The thing is, the pixels on an LCD, don't move about. They're fixed in place. Driving the monitor at "native resolution" gives the cleanest picture, because one pixel in, equals one pixel out. The situation changes a bit, if you drive at a non-native resolution. For example, if I drive my 1280x1024 monitor at 1024x768 resolution, the panel has to re-scale that and the boundaries of the sent pixels aren't very precise. If you're seeing that kind of effect, go to the Display control panel and check the resolution being used. There is no reason, that switching off the monitor, and then back on again, would make a difference when scaling is involved. (Where it gets tricky, is if you own a 1366x768 monitor, where the 1366 is not a multiple of eight. Some weirdness is seen sometimes there, depending on how the video card is instructed to deal with such a situation. For example, a slightly "off" resolution on such monitors, leads to a "virtual tear" in the screen image.) The OSD (on-screen display) in the monitor, and its associated processor, check the resolution (dimensions) of the picture, when a "new" picture is detected, so switching off the monitor and then back on again, forces a fresh "re-detection" of the sent resolution. If the monitor was getting it wrong for some reason, power toggling might clear it up. If you have a digital camera, you could take a picture of the most distorted corner of the display, when it's fuzzy and when it is clear, and post it on imageshack.us . (Paste the two pictures, side by side, so they're captured in the same posted image.) Then post a link here to where the image is located on imageshack.us, and perhaps someone will recognize the effect you're seeing. You can try changing the display resolution, to something non-native, and see if the kind of fuzziness present is the same type or not. Actual failures on LCD monitors, take the form of: 1) Backlight failures are pretty high up on the list. Black screen. 2) Bright pixels. Dead pixels. Or bright vertical lines (where a display driver signal is stuck in some state). Those are panel related defects. 3) Very infrequently, the input/scaler board can fail. The scaler may have a dead DVI/HDMI due to static discharge. Or you might find the monitor in some weird mode, where the image no longer fills the screen. If the monitor uses memory internally to hold one or more frames, a RAM failure can cause some visual effects. 4) The internal power supply can fail, due to bad capacitors. But the frequency of the defect there, should be measured in seconds, like seeing the whole screen flash once a second or something. So whatever your monitor's problem is, it's a bit more subtle. Paul |
#5
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Fuzzy display on SyncMaster 710T
Additional info...
My PC is dual boot, Win XP and Ubuntu 10.10 Linux. I only get the fuzzyiness problem in WinXP and so far it has never happened in Ubuntu. I also have an older PC attached via the analog cable and running Win98 and XUbuntu 6. I have also never had the fuzzyiness problem with either of these. Hence my suspicion that the problem is software-related rather than any type of hardware failure. I shall try to take photos the next time it happens and post them as suggested. |
#6
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Fuzzy display on SyncMaster 710T
gargoyle60 wrote:
Additional info... My PC is dual boot, Win XP and Ubuntu 10.10 Linux. I only get the fuzzyiness problem in WinXP and so far it has never happened in Ubuntu. I also have an older PC attached via the analog cable and running Win98 and XUbuntu 6. I have also never had the fuzzyiness problem with either of these. Hence my suspicion that the problem is software-related rather than any type of hardware failure. I shall try to take photos the next time it happens and post them as suggested. Windows has ClearType, which is antialiasing for fonts. I don't remember the details now, but sometimes that does weird things to the fonts. There are some adjustments for that. http://en.wikipedia.org/wiki/ClearType http://www.microsoft.com/typography/...ePowerToy.mspx Paul |
#7
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Fuzzy display on SyncMaster 710T
I think I may have identified the underlying problem.
The monitor has a setting in the menu to "auto-detect" which signal it is receiving, either analog or digital. I usually set it to auto-detect but I have disabled that and now select the signal manually using the "Source" button on the font panel. Since doing this there has been no fuzziness even in XP. |
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