Garmin GPS - 2620 Streetpilot Operating Temp

Author

2620 Streetpilot Operating Temp

kokovec

2005-05-19, 12:22 pm

I just purchased a 2620 and I use it with on the dash with a beanbag mount.
The other day the temperature where I live reached 95 degrees and the top of
the 2620 became very hot to the touch.
Garmin tels me that the operating temp of the unit can reach 140F.
Given the fact that the 2620 has a hard drive should I be concerned?
Has anyone had any heat related problems with their units?

DS

Seth

2005-05-19, 12:22 pm

"kokovec" <dsiewers@socal.rr.com> wrote in message
news:6FPce.5088$Au1.749@tornado.socal.rr.com...
>I just purchased a 2620 and I use it with on the dash with a beanbag mount.
> The other day the temperature where I live reached 95 degrees and the top
> of the 2620 became very hot to the touch.
> Garmin tels me that the operating temp of the unit can reach 140F.
> Given the fact that the 2620 has a hard drive should I be concerned?
> Has anyone had any heat related problems with their units?

I don't know if it is of concern, but you could check the GPSs
temperature...

http://home.socal.rr.com/diverhank/...r /> atures.htm

Tom H.

2005-05-19, 12:22 pm

LCDs suffer a reversible failure at high temperature, and the temperature
is dependent on the exact liquid crystal material is used in the device.
They undergo a transition that is from a liquid crystal to a normal
isotropic liquid. This is a reversible transition, so things go back to
normal when the device cools down. I could hypothesize situations under
which the alignment layers also undergo some sort of corruption at this
transition temperature, but I have never seen this in practice. (In
practice includes looking at thousands of LCDs as an LCD
scientist/engineer.)

If there is some other component that is subject to failure, then you could
be in trouble. I do not know about your hard drive suggestion. I have left
other Garmin units (none with hard drives) on the dash on sunny hot days in
the Arizona desert with no failure other than LCD anomalies as mentioned
above.

Tom

"kokovec" <dsiewers@socal.rr.com> wrote in message
news:elRce.16511$R46.237@tornado.socal.rr.com...
> That's a great website!
> Thanks for the info.
>
> "Seth" < seth_lermanNOSPAM@ho
tmail.com> wrote in message
> news:5TQce.188$8g.30@news01.roc.ny...
>
>

Tom H.

2005-05-19, 12:22 pm

Dan,

> We purchased these LCD's about a year ago and now they have developed a
> green tint.

Is the green tint visible when the display is off, or is it a green cast to
the images only?

>The other strange thing is that the liquid crystal seems to be "oozing"
>from the top of the displays. It looks like the display is forming
>stalactites. These formations are present as soon as you turn on the units.

I am having trouble interpreting something that might be oozing from the
display with it being present as soon as you turn it on. I would expect
oozoing liquid to be present all of the time. Does it go away when the unit
is off? Is it an actual liquid oozing out, or is there a part of the
viewing area itself along the edge that has been corrupted and looks like
liquid ooze?

Tom
>
>
>
>
> "Tom H." <tom_reader@att.nospam*.net> wrote in message
> news:UG8de.169326$cg1.50884@bgtnsc04-news.ops.worldnet.att.net...
>
>

kokovec

2005-05-19, 12:22 pm

Tom,

The green tint is visible when the unit is turned on but I don't know if
this remains when the unit is turned off. The colors look good on the vector
scope as well as on the NTSC monitor so I'm sure it is the lcd monitor that
is out of whack. Also, the green tint is a very slight one.

As for the oozing... nothing is actually coming out of the display. The top
part of the viewing area looks like liquid ooz. The formations seem to
remain stationary.
Il have not thought to check the monitor when it is turned off. I'll take a
scloser look at the monitors today to and let you know what I observe.

Dan

"Tom H." <tom_reader@att.nospam*.net> wrote in message
news:Prdde.170053$cg1.63573@bgtnsc04-news.ops.worldnet.att.net...
> Dan,
>
>
> Is the green tint visible when the display is off, or is it a green cast
> to the images only?
>
>
> I am having trouble interpreting something that might be oozing from the
> display with it being present as soon as you turn it on. I would expect
> oozoing liquid to be present all of the time. Does it go away when the
> unit is off? Is it an actual liquid oozing out, or is there a part of the
> viewing area itself along the edge that has been corrupted and looks like
> liquid ooze?
>
>
> Tom
>
>

Tom H.

2005-05-19, 12:22 pm

Dan,
If the green tint is subtle and uniform across the display, I would suspect
the computer/monitor interface like the wrong or corrupted device driver.
As I understand these things, the driver needs to know (among other things)
the brightness vs. electrical signal level for the R G and B channels the
monitor. If that is not correct then I can imagine a situation in which all
green pixels are getting a larger signal than they require to produce an
accurate color. There might also be parts within the monitor unit that
could cause this problem. My expertise with LCD relates to things other
than the TFTs and other circuit elements. My experience is more related to
the chemistry and physics of the individual subpixels.

On the "ooze" at the top of the monitor, my guess is that some pixels in
that region have become corrupted, and are no longer producing the correct
values, but there might be numerous causes for this.

Tom

"kokovec" <dsiewers@socal.rr.com> wrote in message
news:gDsde.8564$Au1.7170@tornado.socal.rr.com...
> Tom,
>
> The green tint is visible when the unit is turned on but I don't know if
> this remains when the unit is turned off. The colors look good on the
> vector scope as well as on the NTSC monitor so I'm sure it is the lcd
> monitor that is out of whack. Also, the green tint is a very slight one.
>
> As for the oozing... nothing is actually coming out of the display. The
> top part of the viewing area looks like liquid ooz. The formations seem to
> remain stationary.
> Il have not thought to check the monitor when it is turned off. I'll take
> a scloser look at the monitors today to and let you know what I observe.
>
> Dan
>
> "Tom H." <tom_reader@att.nospam*.net> wrote in message
> news:Prdde.170053$cg1.63573@bgtnsc04-news.ops.worldnet.att.net...
>
>

kokovec

2005-05-19, 12:22 pm

Thanks for all of the info Tom. I'm having ViewSonic come out and look at it
for themselves. They seem equally perplexed.

In other news... I used my 2620 yesterday and as it sat on the dashboard
it's internal temp reached 52 degrees celcius. It was only 72 degrees F
outside.
Since the max operating temperature is 60 C I am thinking that this unit
really needs to stay out of the sun.
When I drove accross the desert a couple of weeks back the outside temp hit
95 F and the top of the unit was too hot to touch. But it still functioned.

Does anyone know if the 2620 has an internal temp probe or does it calculate
the temp using some type of algorithm?
Also, I can't seem to find any type of universal auto mount for the 2620.

Dan

"Tom H." <tom_reader@att.nospam*.net> wrote in message
news:34xde.688213$w62.306267@bgtnsc05-news.ops.worldnet.att.net...
> Dan,
> If the green tint is subtle and uniform across the display, I would
> suspect the computer/monitor interface like the wrong or corrupted device
> driver. As I understand these things, the driver needs to know (among
> other things) the brightness vs. electrical signal level for the R G and B
> channels the monitor. If that is not correct then I can imagine a
> situation in which all green pixels are getting a larger signal than they
> require to produce an accurate color. There might also be parts within
> the monitor unit that could cause this problem. My expertise with LCD
> relates to things other than the TFTs and other circuit elements. My
> experience is more related to the chemistry and physics of the individual
> subpixels.
>
> On the "ooze" at the top of the monitor, my guess is that some pixels in
> that region have become corrupted, and are no longer producing the correct
> values, but there might be numerous causes for this.
>
> Tom
>
> "kokovec" <dsiewers@socal.rr.com> wrote in message
> news:gDsde.8564$Au1.7170@tornado.socal.rr.com...
>
>

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