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help - is it monitor or video card problem
I posted this in the sister a.c.h newsgroup and got no reply. Hope for
a better response here. I have an Asus 24" VS248H-P R LED monitor and a PowerColor (Radeon) HD6750 1GB DDR3 video card. Two or three times now over a six month period, I noticed that the monitor screen will have a semi-transparent grey splotch in the lower left quadrant of the screen. IIRC, each time it happened when I woke up my desktop after it had gone into hibernation mode. Its shape and color make me want to compare it to that of a grey cloud. I can see the desktop, but the area it covers is light to medium grey. At least it's not moving :-) I haven't experienced this problem before. Is it a prelude to the monitor or video card failing? If so, which one would be the likely suspect? What would be useful search terms to use to find out more about it? Thanks, John |
#2
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help - is it monitor or video card problem
On Thu, 9 Jul 2015 15:43:02 +0000 (UTC), "Yes"
wrote: Its shape and color make me want to compare it to that of a grey cloud. I can see the desktop, but the area it covers is light to medium grey. At least it's not moving :-) I haven't experienced this problem before. Is it a prelude to the monitor or video card failing? If so, which one would be the likely suspect? What would be useful search terms to use to find out more about it? Video cards don't fail, not with the quality of computer power supply units and finely crafted MB regulators driving their PCI-E voltages. I seen plenty of brandmake PS unit replacements listed on Ebay for flatpanels, though. My first Olevia model, (one of the first LED flat panels), developed perhaps similar aberrations, on one fateful day, that had worsened into half the lower screen being lost. They send me parts, control modules I believe, when I first talked to the American storefront for handling returns. I used a bedspread to place the monitor face down to replace them. Second time I called, because parts didn't help and it was doing exactly the same thing after I replaced the controls, someone [else then] said I shouldn't have replaced anything. After parlay, they shipped me the next dated model up, either a reworked unit if not effectively new. Dunno, except combine a couple, three years for the first model now to this model, and it's going on no doubt 15 years usage. I'd say knock on wood, but for a 32" replaceable in what I'd want in the event should it fail, (Best Buy's inhouse brand model is my present favorite) -- that's how that works at well under $200 on competitive sales. It's to a point that subscription they're looking is behind the price for the $5 Samsung cellphone. At some point the end product falls below the service mean, and it's in the over-the-shoulder mainsteam groove. I got 2" or 3" galvanized pipes I used a Lincoln stick welder to make my antenna aerial mast, and buy by 20-cent minutes to put everybody else on the latest in blacklistings. But, it's OK to be selective. Same Olevia cost $1500 when I first took interest (kinda like $4000 curved and 4K-resolution units for discrete marketing purposes now). I don't have to but I favor cheap at viably reliable since $10K days, either way, and years in gambling dealings. Get whatever spins the twirly for your cap, I suppose. |
#3
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help - is it monitor or video card problem
Yes wrote:
I posted this in the sister a.c.h newsgroup and got no reply. Hope for a better response here. I have an Asus 24" VS248H-P R LED monitor and a PowerColor (Radeon) HD6750 1GB DDR3 video card. Two or three times now over a six month period, I noticed that the monitor screen will have a semi-transparent grey splotch in the lower left quadrant of the screen. IIRC, each time it happened when I woke up my desktop after it had gone into hibernation mode. Its shape and color make me want to compare it to that of a grey cloud. I can see the desktop, but the area it covers is light to medium grey. At least it's not moving :-) I haven't experienced this problem before. Is it a prelude to the monitor or video card failing? If so, which one would be the likely suspect? What would be useful search terms to use to find out more about it? Thanks, John I can find articles on such things, but it's unlikely your setup has the same stimulus (too much heat behind screen). https://discussions.apple.com/thread...art=0&tstart=0 ******* Video cards don't tend to make splotches. There was one video card problem (driver related), where a discolored circle appeared around some gaming elements. That's about as close to a splotch as I could get. Otherwise, memory faults on a video card could give colored rectangles (memory array that no longer writes but reads back random garbage). I don't think I've ever heard of a good "snow" type failure, except for people using too long an HDMI cable. That makes colored snow. But with a short HDMI cable, you're unlikely to have a video card make snow on its own, or splotches for that matter. Some geometries are harder to make than others. Whereas a physical problem with an LCD monitor, can be related to its physical structure. You can have vivid vertical lines on an LCD screen, when the array driver ICs pack up. The array driver failures seem to have a preferred direction for defects. And on an LCD monitor with multisync scaler, the memory chip on the scaler can fail - and you'd expect element geometries similar to a video card defect. The difference is, the video card can "amplify" a defect, whereas the scaler memory failure, the faults stay "closer to the initial failure bit". And the thing about the video card, is if something really fails (shader program goes crazy), the video card driver is likely to report "VPU recover" or "driver recovery in progress" or similar. So a video card defect can't have too much of an impact on card operation, or you'll be able to tell from "screen blinking to black" that the driver the OS uses is not happy with what the card is doing. Paul |
#4
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help - is it monitor or video card problem
Yes wrote:
I posted this in the sister a.c.h newsgroup and got no reply. Hope -- snipped -- I haven't experienced this problem before. Is it a prelude to the monitor or video card failing? If so, which one would be the likely suspect? What would be useful search terms to use to find out more about it? Thanks, John I did some deeper Googling and ran across a reference to "backlight" failure. I don't know what that means, only that the symptoms I described seem to match that term. Of course, the warranty on my monitor expired about four months ago :-) It would seem that the remedy is to replace the monitor, which is not a big deal, but there was no info about how soon that you should do so once the problem crops up. Between Paul's and Flasherly's responses, at least I can rule out the video card. I would have hated to have to deal with two problems at once. One at a time is more manageable. |
#5
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help - is it monitor or video card problem
Yes wrote:
Yes wrote: I posted this in the sister a.c.h newsgroup and got no reply. Hope -- snipped -- I haven't experienced this problem before. Is it a prelude to the monitor or video card failing? If so, which one would be the likely suspect? What would be useful search terms to use to find out more about it? Thanks, John I did some deeper Googling and ran across a reference to "backlight" failure. I don't know what that means, only that the symptoms I described seem to match that term. Of course, the warranty on my monitor expired about four months ago :-) It would seem that the remedy is to replace the monitor, which is not a big deal, but there was no info about how soon that you should do so once the problem crops up. Between Paul's and Flasherly's responses, at least I can rule out the video card. I would have hated to have to deal with two problems at once. One at a time is more manageable. There are two symptoms I know of, for backlight failure. 1) CCFL tubes change color when they get old. At 25,000 hours, the light becomes brownish instead of white. 2) Inverter failures cause the CCFL tubes to go off completely. Sometimes, the tube comes on for two seconds, then shuts off. This means the inverter detects "too much load" when moving from ignite to burn state. The tube operates at higher voltage and lower current when it starts. And as it warms up, the voltage across the tube starts to drop. The inverter and the tube characteristic are matched to one another. But as the setup gets older, the load presented can change enough, that the inverter no longer tolerates it. Or the inverter just plain doesn't work right any more. There is an entire 130 page book, which discusses the quirks of CCFL lighting systems, and its more art than science (making them work reliably). LED based backlights are different. No nasty voltages. The LEDs still age. Failure on LEDs is defined as the light output level dropping below a certain level. So a user might still see light, but a LED company person would say "all those LEDs are failed" because they no longer deliver the amount of light expected. While the theory says the LED based lighting should be very reliable, everyone has seen instances of LED based lighting, where an early complete failure happens and there is no light at all. You won't get "brownish", or "on for two seconds, then dark" as symptoms with LEDs. So in that respect, a LED lit monitor may have fewer annoying symptoms over lifetime. But out-right failure (dead LED) is still possible. The "gray splotch" problem is probably a chemistry problem with the chemical between the sheets of glass. Rather than a backlight problem. Note that, some LCD panels using LEDs, are "edge lit". They use a fancy plastic element to redirect the light from an array of LEDs on the edge of the panel, to cause light to appear (uniformly) in the center of the panel. If any of the components shift mechanically, this translates to "backlight bleed". So some backlight bleed problems, change with time, as some of the materials work themselves loose. Paul |
#6
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help - is it monitor or video card problem
On Fri, 10 Jul 2015 06:58:06 +0000 (UTC), "Yes"
wrote: I did some deeper Googling and ran across a reference to "backlight" failure. I don't know what that means, only that the symptoms I described seem to match that term. Of course, the warranty on my monitor expired about four months ago :-) It would seem that the remedy is to replace the monitor, which is not a big deal, but there was no info about how soon that you should do so once the problem crops up. Between Paul's and Flasherly's responses, at least I can rule out the video card. I would have hated to have to deal with two problems at once. One at a time is more manageable. Good thing, as that involves a bulb or related support circuitry changes, being more apt to find common replacement parts, than, say, aberrations you may be experiencing from non-power related logic circuitry directly addressing the 3 colors/black&white comprising a pixel display (the surrounding cathode tubes further facilities by brightening the pixel). Most "video cards" are not: Most all MBs, though curiously not shrunk yet far enough for yet having slots for prohibitively expensive "video boards," in other words they're almost exclusively sold across the broader market already chipped with video (dunno, personally, about these newer offerings, with the CPU now formally incorporating video subsystems). Tedious, is it not, dealing with it? Good thing is you'll feel so much better when your vast technical expertise accomplishes so many amazing things you know. Like that Behringer soundprocessing board, alongside possibly surface mounted automated machine soldering, for the arrays of capacitors I attempted to resolder last evening (bought 20 of them, at 15-cents each, for starters...polarized 10u farads), to replace ostensible Behringer ****. Got as far as finishing two. Tolerances were too small and tight, totally for working under a x15 or x20 stereoscopic workbench microscope with a small, close and tight 20-watt soldering iron. That I could do it, doing two (had to solder them from the backside of the board's contacts, otherwise too much and tight of miniature real estate) made me feel -- sooo savvy, like accomplished. I felt exactly that way all the way to the garbage can, where I dumped the rest of the capacitors alongside the Behringer unit. Just in time to return and write a nasty-assed review of Behringer on Amazon. Mark my words, matey. -- Enduser: To be kept in the dark and never, ever watered. |
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