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monitor mystery
Old 10-03-2004, 01:06 AM   #1 (permalink)
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I've just noticed something on a rarely used monitor (and its only a year old).. It looks like something has scratched the surface of the monitor, but from the inside of the glass that protects the actual screen (which seems to be recessed about 1/4" behind the scratch). It looks like a coating of some sort has worn away, but in a patten that looks like it was done by animal claws or fingernails. There is no texture of this on the front surface, and if I try to scratch it with my own fingernails nothing happens, there's nothing to "catch" on to. The monitor is a NEC Multisync F#991SB. Anyone have any ideas on the cause and a cure?

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Re: monitor mystery
Old 10-03-2004, 01:00 PM   #2 (permalink)
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How about a picture of the problem?

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Re: monitor mystery
Old 10-03-2004, 05:16 PM   #3 (permalink)
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I'll have to see what I can do, but its inaccesible for the moment. It looks like some kind of UV laminate coating which makes the screen look a little darker (like those radiation screens) but which in this case seems to have been scratched off in a random pattern in some places, like someone picking at it with a fingernail. Upon a closer look, I'm thinking this front glass might be user removable because it is so far in front of what looks like the actual screen, and there seem to be some holding clips around the bottom edge, although I can't quite figure out it there is a way to release them.

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Re: monitor mystery
Old 10-03-2004, 06:00 PM   #4 (permalink)
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I am a computer salesman. I have seen this kind of thing before. It happens during production and assembly. It probably is finger nail scratches or the like. I have even seen fingerprints on the inside of the tube with no way to remove them. NEC has a 3 year warranty, I would get it replaced. Viewsonic and NEC are the brands I carry. They have never questioned me on this kind of thing in the past when seeking a new monitor under warranty.
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Re: monitor mystery
Old 10-03-2004, 06:11 PM   #5 (permalink)
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But is this something that can develop on its own after a period of time? I could swear this wasn't there when the monitor was first purchased and used extensively - we would have noticed it. (That system has been dormant, sitting on a desk for several months.)

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Re: monitor mystery
Old 10-03-2004, 07:06 PM   #6 (permalink)
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Is it possible that this is from having the same image on the monitor for long periods of time while the monitor was on. This used to be a problem with monitors and that is why screen savers first came along. Sometimes you would get really odd looking patterns from a variety of images that might be on the screen for long periods of time. Just a wild guess, but something to consider.
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Re: monitor mystery
Old 10-04-2004, 12:00 AM   #7 (permalink)
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The inside of the glass is coated with phosphor dots.. They add either a shadow mask or aperture grill inside which is a metal mesh that ensures only the correct colors are lit at the right time.. This also helps produce a crisp picture.. So.. from what you are describing, I'm getting the impression that this metal mesh has moved around somehow and is scraping away at the phosphor dots..

To my limited knowledge, there is no inexpensive way to fix this except to replace the CRT or the monitor itself..


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