FW: monitor uniformity/ cleaning AR screens
FW: monitor uniformity/ cleaning AR screens
- Subject: FW: monitor uniformity/ cleaning AR screens
- From: Wire Moore <email@hidden>
- Date: Thu, 16 Aug 2001 22:19:52 -0700
You glass cleaner is not likely to have anything to do with this problem.
As you noted, color impurity is very common with CRT displays. It's more of
a problem with larger tubes such as 21". It's not so much a question of
whether purity is right or not on any set, but more of how bad it is and do
you notice it.
In the off chance you have an NEC unit, there is a control called
Globalsync, accessible with the front panel with which you can adjust to
optimize display color purity WRT to the influence of the Earth's magnetic
field. Other manufacturers handle this electronically with or without user
controls. Sony products have front panel controls called "beam landing" or
"landing", as do many other makes of CRT display.
But all front panel control are subordinate to a variety of internal
alignment factors. If the unit isn't properly internally aligned, nothing
you can do externally will help, such as the front panel controls or moving
the unit.
Mislalignment can occur because of a magnetized chassis, poor manufacturing
tolerances, mechanical shock during transport, or wear (change) of the
electronics.
The set runs an internal degauss with each cold start, so it will tend
demagnetize the chassis with power cycles. You can use a hand CRT degaussing
coil to help bad cases, which are rare. If you do so, avoid degaussing the
rear of the set as there are some magnetized components back there which are
sensitive to the degaussing field.
Going off base a tad WRT to Earth field influence, CRTs are also
manufactured for use in the north vs. south hemispheres. If you bought a 21"
CRT display in one hemisphere and used it in the other, you could see worse
color purity.
Here's the monitor FAQ from sci.electronics
http://an.hitchcock.org/repairfaq/REPAIR/F_monfaq.html
Anyway, I think lots of folks use Windex on displays regularly with no ill
effect to the coating. I do with no problems.
Wire Moore
on 8/16/01 1:09 PM, Rhea Garen at email@hidden wrote:
>
I have a flat screen, trinitron monitor with anti reflective coating on the
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screen and I've had some problems eliminating very slight red\green
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inconsistencies\patches on my monitor screen. I've tried lots of
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degaussing and adjusting the convergence.The monitor and suction cups for
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my calibrator were being cleaned with an ammonia based glass cleaner before
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I realized that was not a recommended cleaning agent. We now use dry or
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dampened cloths. Is there a mild solvent that would be acceptable to use to
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clean this screen that won't hurt the AR coating? Is it possible that
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we've damaged the coating and that's what's causing my color uniformity
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problems? I know CRT's are notorious for exhibiting such irregularities--I
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also have large flouresent photolamps in the same room, though they're on a
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different line. I guess I should try moving the monitor to a different
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room to see if we're experiencing some magnetic effects.
>
>
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Rhea Garen