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Faint vertical streaks on new monitor
I just bought a Samsung Syncmaster 793s 17" monitor. I'm using a very
old computer, with a very old video card, a SiS 6326 (Silicon Integrated Systems) from 1997. I'm using Windows 98. I installed the appropriate driver that came with the monitor CD. I have read the entire FAQ at www.repairfaq.org and my problem didn't come up. When I had the display at 800*600 with 75 Hz refresh rate, there was a linearity problem. The 2 inches closest to the right and left of the screen were slightly compressed. Barely noticeable by the naked eye. By measuring the distances using a gif image with evenly spaced lines, I calculated the difference (from the center screen) to be between 5-10 %. In the FAQ it says that cheap monitors can be expected to have up to a 2 % difference in linearity (I take this monitor to be on the cheapo side). But I solved this problem by changing the Hz rate. And that's where my real problem comes in. After reading the monitor CD manual to make sure I wasn't doint something I would regret, I manually changed the refresh rate to 85 Hz (always at 800*600). Perfect! Beautiful image. Except... There are these evenly spaced vertical lines, just noticeable, across the screen. Others might not complain about them. I'm a perfectionist (there's a bit about perfectionists in the FAQ). There's 7 of them. They weren't there at 75 Hz. Very evenly spaced, about 4.2 cm apart (1.65 inches). They are each 1 mm thick (0.04 inches). They seem to be slightly brighter than the sorrounding picture. On a black image they don't appear, but on a uniform image of white, red, blue, or green, they do. When viewing text, I can't notice them, though they still appear in the blank parts of the text screen. They stretch from top to bottom. The 2 closest to the left and right side of the screen are about 2 and 3 cm respectively from the edge of the screen. If I move the screen using the controls on the side of the monitor, the lines move with the screen. The image, otherwise, is absolutely perfect, beautiful, perfect linearity, colors absolutely perfect, no strange noises, no problem anywhere whatsoever. One possible factor I noticed in the FAQ which might apply: most video cards and monitors use 75 ohms, but older stuff might use 50 ohms, and this could cause an impedance mismatch. The video card is old, from 1997. Thanks in advance for any help. P.S.: one final off topic query while I'm at it. The specifications on the CD manual said the monitor had presert timing modes for vertical frequency of 75000 Hz at VESA 640*480, and 85000 Hz at VESA 800*600 and VESA 1024*768. Sorry for the stupid question, but does this mean the monitor will blow up if I change the desktop screen resolution from 800*600 to 640*480 without first reducing the refresh rate to 75 Hz? I read in the FAQ that modern monitors automatically block any signal which is incompatible with their hardwired specs. As I read this I couldn't help but wonder: what a brilliant tactical move, allowing your clients to live so they can shop again another day  !Pure genius! And it only took them 20 years to think of this! [Irony off] |
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#2
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At a guess, your monitor simply has multiple faults in the power supply
area. The faults simply mainfest differently at different refresh rates. Either junk it, or have it professionally fixed. "Wizard of Ozz" wrote in message om... I just bought a Samsung Syncmaster 793s 17" monitor. I'm using a very old computer, with a very old video card, a SiS 6326 (Silicon Integrated Systems) from 1997. I'm using Windows 98. I installed the appropriate driver that came with the monitor CD. I have read the entire FAQ at www.repairfaq.org and my problem didn't come up. When I had the display at 800*600 with 75 Hz refresh rate, there was a linearity problem. The 2 inches closest to the right and left of the screen were slightly compressed. Barely noticeable by the naked eye. By measuring the distances using a gif image with evenly spaced lines, I calculated the difference (from the center screen) to be between 5-10 %. In the FAQ it says that cheap monitors can be expected to have up to a 2 % difference in linearity (I take this monitor to be on the cheapo side). But I solved this problem by changing the Hz rate. And that's where my real problem comes in. After reading the monitor CD manual to make sure I wasn't doint something I would regret, I manually changed the refresh rate to 85 Hz (always at 800*600). Perfect! Beautiful image. Except... There are these evenly spaced vertical lines, just noticeable, across the screen. Others might not complain about them. I'm a perfectionist (there's a bit about perfectionists in the FAQ). There's 7 of them. They weren't there at 75 Hz. Very evenly spaced, about 4.2 cm apart (1.65 inches). They are each 1 mm thick (0.04 inches). They seem to be slightly brighter than the sorrounding picture. On a black image they don't appear, but on a uniform image of white, red, blue, or green, they do. When viewing text, I can't notice them, though they still appear in the blank parts of the text screen. They stretch from top to bottom. The 2 closest to the left and right side of the screen are about 2 and 3 cm respectively from the edge of the screen. If I move the screen using the controls on the side of the monitor, the lines move with the screen. The image, otherwise, is absolutely perfect, beautiful, perfect linearity, colors absolutely perfect, no strange noises, no problem anywhere whatsoever. One possible factor I noticed in the FAQ which might apply: most video cards and monitors use 75 ohms, but older stuff might use 50 ohms, and this could cause an impedance mismatch. The video card is old, from 1997. Thanks in advance for any help. P.S.: one final off topic query while I'm at it. The specifications on the CD manual said the monitor had presert timing modes for vertical frequency of 75000 Hz at VESA 640*480, and 85000 Hz at VESA 800*600 and VESA 1024*768. Sorry for the stupid question, but does this mean the monitor will blow up if I change the desktop screen resolution from 800*600 to 640*480 without first reducing the refresh rate to 75 Hz? I read in the FAQ that modern monitors automatically block any signal which is incompatible with their hardwired specs. As I read this I couldn't help but wonder: what a brilliant tactical move, allowing your clients to live so they can shop again another day !Pure genius! And it only took them 20 years to think of this! [Irony off] |
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#3
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I had vert lines in my monitor using a video card (I can't remember the
mfg.) It was the video card. Replacing it fixed the problem. Lines showed up with different symptoms at different refresh rates. I assumed it was a cap on the video card. Bad cap in the power supply (powering the video) in your monitor can cause the same problem. The regularity of the lines you describe make me think it's the video card not the monitor. vert lines from left to right should not be the same intensity or as sharp as you travel across the screen. "Craig Hart" wrote in message ... At a guess, your monitor simply has multiple faults in the power supply area. The faults simply mainfest differently at different refresh rates. Either junk it, or have it professionally fixed. "Wizard of Ozz" wrote in message om... I just bought a Samsung Syncmaster 793s 17" monitor. I'm using a very old computer, with a very old video card, a SiS 6326 (Silicon Integrated Systems) from 1997. I'm using Windows 98. I installed the appropriate driver that came with the monitor CD. I have read the entire FAQ at www.repairfaq.org and my problem didn't come up. When I had the display at 800*600 with 75 Hz refresh rate, there was a linearity problem. The 2 inches closest to the right and left of the screen were slightly compressed. Barely noticeable by the naked eye. By measuring the distances using a gif image with evenly spaced lines, I calculated the difference (from the center screen) to be between 5-10 %. In the FAQ it says that cheap monitors can be expected to have up to a 2 % difference in linearity (I take this monitor to be on the cheapo side). But I solved this problem by changing the Hz rate. And that's where my real problem comes in. After reading the monitor CD manual to make sure I wasn't doint something I would regret, I manually changed the refresh rate to 85 Hz (always at 800*600). Perfect! Beautiful image. Except... There are these evenly spaced vertical lines, just noticeable, across the screen. Others might not complain about them. I'm a perfectionist (there's a bit about perfectionists in the FAQ). There's 7 of them. They weren't there at 75 Hz. Very evenly spaced, about 4.2 cm apart (1.65 inches). They are each 1 mm thick (0.04 inches). They seem to be slightly brighter than the sorrounding picture. On a black image they don't appear, but on a uniform image of white, red, blue, or green, they do. When viewing text, I can't notice them, though they still appear in the blank parts of the text screen. They stretch from top to bottom. The 2 closest to the left and right side of the screen are about 2 and 3 cm respectively from the edge of the screen. If I move the screen using the controls on the side of the monitor, the lines move with the screen. The image, otherwise, is absolutely perfect, beautiful, perfect linearity, colors absolutely perfect, no strange noises, no problem anywhere whatsoever. One possible factor I noticed in the FAQ which might apply: most video cards and monitors use 75 ohms, but older stuff might use 50 ohms, and this could cause an impedance mismatch. The video card is old, from 1997. Thanks in advance for any help. P.S.: one final off topic query while I'm at it. The specifications on the CD manual said the monitor had presert timing modes for vertical frequency of 75000 Hz at VESA 640*480, and 85000 Hz at VESA 800*600 and VESA 1024*768. Sorry for the stupid question, but does this mean the monitor will blow up if I change the desktop screen resolution from 800*600 to 640*480 without first reducing the refresh rate to 75 Hz? I read in the FAQ that modern monitors automatically block any signal which is incompatible with their hardwired specs. As I read this I couldn't help but wonder: what a brilliant tactical move, allowing your clients to live so they can shop again another day !Pure genius! And it only took them 20 years to think of this! [Irony off] |
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#4
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If it was the video card, it would have been obvious on the old monitor
also. The original poster doesn't say, but implies that he just bought the MONITOR (not the whole computer); thus I am assuming he had a different monitor working OK previously. If this is so, a quick test by swaping back to the original monitor will verify. Apologies if I've misinterpreted. "Jeff Rigby" wrote in message ... I had vert lines in my monitor using a video card (I can't remember the mfg.) It was the video card. Replacing it fixed the problem. Lines showed up with different symptoms at different refresh rates. I assumed it was a cap on the video card. Bad cap in the power supply (powering the video) in your monitor can cause the same problem. The regularity of the lines you describe make me think it's the video card not the monitor. vert lines from left to right should not be the same intensity or as sharp as you travel across the screen. "Craig Hart" wrote in message ... At a guess, your monitor simply has multiple faults in the power supply area. The faults simply mainfest differently at different refresh rates. Either junk it, or have it professionally fixed. "Wizard of Ozz" wrote in message om... I just bought a Samsung Syncmaster 793s 17" monitor. I'm using a very old computer, with a very old video card, a SiS 6326 (Silicon Integrated Systems) from 1997. I'm using Windows 98. I installed the appropriate driver that came with the monitor CD. I have read the entire FAQ at www.repairfaq.org and my problem didn't come up. When I had the display at 800*600 with 75 Hz refresh rate, there was a linearity problem. The 2 inches closest to the right and left of the screen were slightly compressed. Barely noticeable by the naked eye. By measuring the distances using a gif image with evenly spaced lines, I calculated the difference (from the center screen) to be between 5-10 %. In the FAQ it says that cheap monitors can be expected to have up to a 2 % difference in linearity (I take this monitor to be on the cheapo side). But I solved this problem by changing the Hz rate. And that's where my real problem comes in. After reading the monitor CD manual to make sure I wasn't doint something I would regret, I manually changed the refresh rate to 85 Hz (always at 800*600). Perfect! Beautiful image. Except... There are these evenly spaced vertical lines, just noticeable, across the screen. Others might not complain about them. I'm a perfectionist (there's a bit about perfectionists in the FAQ). There's 7 of them. They weren't there at 75 Hz. Very evenly spaced, about 4.2 cm apart (1.65 inches). They are each 1 mm thick (0.04 inches). They seem to be slightly brighter than the sorrounding picture. On a black image they don't appear, but on a uniform image of white, red, blue, or green, they do. When viewing text, I can't notice them, though they still appear in the blank parts of the text screen. They stretch from top to bottom. The 2 closest to the left and right side of the screen are about 2 and 3 cm respectively from the edge of the screen. If I move the screen using the controls on the side of the monitor, the lines move with the screen. The image, otherwise, is absolutely perfect, beautiful, perfect linearity, colors absolutely perfect, no strange noises, no problem anywhere whatsoever. One possible factor I noticed in the FAQ which might apply: most video cards and monitors use 75 ohms, but older stuff might use 50 ohms, and this could cause an impedance mismatch. The video card is old, from 1997. Thanks in advance for any help. P.S.: one final off topic query while I'm at it. The specifications on the CD manual said the monitor had presert timing modes for vertical frequency of 75000 Hz at VESA 640*480, and 85000 Hz at VESA 800*600 and VESA 1024*768. Sorry for the stupid question, but does this mean the monitor will blow up if I change the desktop screen resolution from 800*600 to 640*480 without first reducing the refresh rate to 75 Hz? I read in the FAQ that modern monitors automatically block any signal which is incompatible with their hardwired specs. As I read this I couldn't help but wonder: what a brilliant tactical move, allowing your clients to live so they can shop again another day !Pure genius! And it only took them 20 years to think of this! [Irony off] |
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#6
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#7
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Sam Goldwasser wrote in message ...
(Wizard of Ozz) writes: If I move the screen using the controls on the side of the monitor, the lines move with the screen. So the lines stay with the picture? Are they aligned perfectly with the pixels? I don't understand perfectly your question, but here goes: if I draw a vertical line in the screen with photoshop, they will be perfectly parallel to that line. The image, otherwise, is absolutely perfect, beautiful, perfect linearity, colors absolutely perfect, no strange noises, no problem anywhere whatsoever. One possible factor I noticed in the FAQ which might apply: most video cards and monitors use 75 ohms, but older stuff might use 50 ohms, and this could cause an impedance mismatch. The video card is old, from 1997. Not likely. 50 ohms has never been used recent times. You should check the monitor with another video card or PC as it may indeed be the video card as someone else suggested. Ignore that guy who didn't bother to pay attention to what you wrote and said to junk the monitor. I'm going to hook up the monitor with another computer to see what happens. Thanks for the help. |
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#8
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Franc Zabkar wrote in message . ..
On 23 Oct 2004 23:40:46 -0700, (Wizard of Ozz) put finger to keyboard and composed: I just bought a Samsung Syncmaster 793s 17" monitor. I'm using a very old computer, with a very old video card, a SiS 6326 (Silicon Integrated Systems) from 1997. I'm using Windows 98. snip After reading the monitor CD manual to make sure I wasn't doint something I would regret, I manually changed the refresh rate to 85 Hz (always at 800*600). Perfect! Beautiful image. Except... There are these evenly spaced vertical lines, just noticeable, across the screen. Others might not complain about them. I'm a perfectionist (there's a bit about perfectionists in the FAQ). There's 7 of them. They weren't there at 75 Hz. Very evenly spaced, about 4.2 cm apart (1.65 inches). They are each 1 mm thick (0.04 inches). They seem to be slightly brighter than the sorrounding picture. On a black image they don't appear, but on a uniform image of white, red, blue, or green, they do. When viewing text, I can't notice them, though they still appear in the blank parts of the text screen. They stretch from top to bottom. The 2 closest to the left and right side of the screen are about 2 and 3 cm respectively from the edge of the screen. If I move the screen using the controls on the side of the monitor, the lines move with the screen. Do the lines move with the raster, or do they move with the video content? What happens if you display a black screen and max out the brightness and contrast? - Franc Zabkar They move with the raster. On a black screen (a black gif image engulfing the screen) the lines disappear completely. Changing the brightness or contrast doesn't affect this. |
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#9
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(Wizard of Ozz) wrote in message . com...
I just bought a Samsung Syncmaster 793s 17" monitor. I'm using a very old computer, with a very old video card, a SiS 6326 (Silicon Integrated Systems) from 1997. I'm using Windows 98. That's 1st problem I installed the appropriate driver that came with the monitor CD. I have read the entire FAQ at www.repairfaq.org and my problem didn't come up. up to a 2 % difference in linearity (I take this monitor to be on the cheapo side). But I solved this problem by changing the Hz rate. And That's 2nd problem that's where my real problem comes in. After reading the monitor CD manual to make sure I wasn't doint something I would regret, I manually changed the refresh rate to 85 Hz (always at 800*600). Perfect! Beautiful image. Except... There are these evenly spaced vertical lines, just noticeable, across the screen. Others might not complain about them. I'm a perfectionist That's main problem |
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#10
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"Marlboro" wrote in message
om... (Wizard of Ozz) wrote in message . com... I just bought a Samsung Syncmaster 793s 17" monitor. I'm using a very old computer, with a very old video card, a SiS 6326 (Silicon Integrated Systems) from 1997. I'm using Windows 98. That's 1st problem I installed the appropriate driver that came with the monitor CD. I have read the entire FAQ at www.repairfaq.org and my problem didn't come up. up to a 2 % difference in linearity (I take this monitor to be on the cheapo side). But I solved this problem by changing the Hz rate. And That's 2nd problem that's where my real problem comes in. After reading the monitor CD manual to make sure I wasn't doint something I would regret, I manually changed the refresh rate to 85 Hz (always at 800*600). Perfect! Beautiful image. Except... There are these evenly spaced vertical lines, just noticeable, across the screen. Others might not complain about them. I'm a perfectionist That's main problem Ok, I'm confused.... Is this to say that THIS monitor is no good or just not for this particular use? I have one just like it with the same problem. Mine is a secondary unit and I have no use for it otherwise, but other than the faint vertical streaks as mentioned by the OP in theirs, mine has an otherwise good picture. Is it worth my while to sell it? IF this monitor is ok to use and anyone CAN use it, let me know. I'll make you a decent deal. TRM |
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#11
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"Jeff Rigby" wrote in message ...
I had vert lines in my monitor using a video card (I can't remember the mfg.) It was the video card. Replacing it fixed the problem. Lines showed up with different symptoms at different refresh rates. I assumed it was a cap on the video card. Bad cap in the power supply (powering the video) in your monitor can cause the same problem. The regularity of the lines you describe make me think it's the video card not the monitor. vert lines from left to right should not be the same intensity or as sharp as you travel across the screen. I connected the monitor to another computer and the lines didn't appear (did lots of color tests to make sure). So it's the video card, after all, apparently. Thanks for helping. [I also tested the old computer with the bad video card by playing a Commodore 64 games emulator on full screen. This of course changes the screen to some DOS type view or something. While playing a game on the emulator in this DOS type screen, the vertical lines don't appear, even on a uniform colored background.] "Craig Hart" wrote in message ... At a guess, your monitor simply has multiple faults in the power supply area. The faults simply mainfest differently at different refresh rates. Either junk it, or have it professionally fixed. "Wizard of Ozz" wrote in message om... I just bought a Samsung Syncmaster 793s 17" monitor. I'm using a very old computer, with a very old video card, a SiS 6326 (Silicon Integrated Systems) from 1997. I'm using Windows 98. I installed the appropriate driver that came with the monitor CD. I have read the entire FAQ at www.repairfaq.org and my problem didn't come up. When I had the display at 800*600 with 75 Hz refresh rate, there was a linearity problem. The 2 inches closest to the right and left of the screen were slightly compressed. Barely noticeable by the naked eye. By measuring the distances using a gif image with evenly spaced lines, I calculated the difference (from the center screen) to be between 5-10 %. In the FAQ it says that cheap monitors can be expected to have up to a 2 % difference in linearity (I take this monitor to be on the cheapo side). But I solved this problem by changing the Hz rate. And that's where my real problem comes in. After reading the monitor CD manual to make sure I wasn't doint something I would regret, I manually changed the refresh rate to 85 Hz (always at 800*600). Perfect! Beautiful image. Except... There are these evenly spaced vertical lines, just noticeable, across the screen. Others might not complain about them. I'm a perfectionist (there's a bit about perfectionists in the FAQ). There's 7 of them. They weren't there at 75 Hz. Very evenly spaced, about 4.2 cm apart (1.65 inches). They are each 1 mm thick (0.04 inches). They seem to be slightly brighter than the sorrounding picture. On a black image they don't appear, but on a uniform image of white, red, blue, or green, they do. When viewing text, I can't notice them, though they still appear in the blank parts of the text screen. They stretch from top to bottom. The 2 closest to the left and right side of the screen are about 2 and 3 cm respectively from the edge of the screen. If I move the screen using the controls on the side of the monitor, the lines move with the screen. The image, otherwise, is absolutely perfect, beautiful, perfect linearity, colors absolutely perfect, no strange noises, no problem anywhere whatsoever. One possible factor I noticed in the FAQ which might apply: most video cards and monitors use 75 ohms, but older stuff might use 50 ohms, and this could cause an impedance mismatch. The video card is old, from 1997. Thanks in advance for any help. P.S.: one final off topic query while I'm at it. The specifications on the CD manual said the monitor had presert timing modes for vertical frequency of 75000 Hz at VESA 640*480, and 85000 Hz at VESA 800*600 and VESA 1024*768. Sorry for the stupid question, but does this mean the monitor will blow up if I change the desktop screen resolution from 800*600 to 640*480 without first reducing the refresh rate to 75 Hz? I read in the FAQ that modern monitors automatically block any signal which is incompatible with their hardwired specs. As I read this I couldn't help but wonder: what a brilliant tactical move, allowing your clients to live so they can shop again another day !Pure genius! And it only took them 20 years to think of this! [Irony off] |
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