Correction original post.
I really don't think excessive is the root problem here.
Should read.
I really don't think excessive heat is the root problem here
Steve N4LQ
----- Original Message -----
From: "Steve N4LQ" <n4lq@iglou.com>
To: <tentec@contesting.com>
Sent: Friday, September 17, 2004 11:26 PM
Subject: Re: [TenTec] Orion LCD screen darkening
> I tend to believe the dark areas are a quality issue. My reasoning is:
> A. Only some displays have the problem. (Mine did not).
> B. One must have a B. to sound intelligent.
> Mine took a long time, 30 minutes, to completely warm up to where the
> contrast was stable. As it warmed up, the contrast would vary from milky
> looking to sharp. I assume the long warm up time is not so much waiting
for
> the back-light to get brighter but rather for the crystals to become warm
> enough to block the light from the back-light.
> The Icom series of LCDs take about 5 minutes warm up but they seem to
start
> out with low brightness and get brighter instead of low contrast like the
> Orion's display. The Icoms seem more consistent with typical computer LCD
> displays and they react to temperature.
> I really don't think excessive is the root problem here. Perhaps the extra
> cooling from a fan helps compensate for the defective LCD.
> Steve N4LQ
> ----- Original Message -----
> From: "Ken Brown" <ken.d.brown@verizon.net>
> To: <tentec@contesting.com>
> Sent: Friday, September 17, 2004 8:15 PM
> Subject: [TenTec] Orion LCD screen darkening
>
>
> > Hi all,
> >
> > I am not an Orion owner, nor have I had the opportunity to operate one.
> > However I have read a lot of the posts regarding various virtues and
> > faults in the Orion. The "screen darkening" has been mentioned often
> > enough in unemotional postings, that I believe it is a problem that
> > really exists in many of the Orions. I have seen the addition of a fan
> > mentioned as a cure for this problem. Since the darkening is not uniform
> > across the whole display, it occurs to me that the cause of the problem
> > is not only excessive heat, but also non-uniform temperature across the
> > display. I wonder if either instead of or in addition to adding a fan,
> > it might be worth while to place a highly heat conductive plate behind
> > the LCD panel. The plate would conduct heat such that the temperature
> > would be more uniform across the back of the display. Some insulation on
> > the opposite (from the display) side of the conductive plate might help
> > also. This could simply be a piece of copper clad printed circuit board
> > material, with dimensions equal or larger than the display panel. If it
> > is single sided PCB material the copper side would be closest to the
> > display panel. Maybe double sided would be even better. Since I have
> > never seen an Orion, I do not know whether there is room for such a
> > plate, or an easy way to attach it to the back of the display. Just a
> > suggestion.
> >
> > DE N6KB
> >
> >
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> >
>
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