Radar display fogging
 

The LCD display on my JRC 1500 radar fogs on the inside of the front
glass window (not on the LCD itself). It seems that warm moist air
inside the unit condenses on the cold glass window. I returned it to the
service center during it's warranty but it still fogged afterwards, now
that the warranty has long expired I am toying with fitting 2 spigots
that would allow warm dry air from say a 12v hair dryer to sweep out the
moist air. Any comments?
Dick

Richard Lane wrote:
The LCD display on my JRC 1500 radar fogs on the inside of the front
glass window (not on the LCD itself). It seems that warm moist air
inside the unit condenses on the cold glass window. I returned it to
the service center during it's warranty but it still fogged
afterwards, now that the warranty has long expired I am toying with
fitting 2 spigots that would allow warm dry air from say a 12v hair
dryer to sweep out the moist air. Any comments?
Dick

Is there any way you can fit silica gel bags inside the casing?

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Wonder how the moisture is getting in there? Sounds like something's not
sealed properly. Can you just remove the glass? Assuming you can take it out
and replace it, maybe it's not sealing properly upon reinstallation. Maybe
use Rain-X on the inside?

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Keith
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'Every man has his price. Mine is $3.95.'
"Dennis Pogson" wrote in message
...
Richard Lane wrote:
The LCD display on my JRC 1500 radar fogs on the inside of the front
glass window (not on the LCD itself). It seems that warm moist air
inside the unit condenses on the cold glass window. I returned it to
the service center during it's warranty but it still fogged
afterwards, now that the warranty has long expired I am toying with
fitting 2 spigots that would allow warm dry air from say a 12v hair
dryer to sweep out the moist air. Any comments?
Dick

Is there any way you can fit silica gel bags inside the casing?

Remove "nospam" from return address.


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.779 / Virus Database: 526 - Release Date: 19/10/2004

Keith wrote:
Wonder how the moisture is getting in there? Sounds like something's not
sealed properly. Can you just remove the glass? Assuming you can take it out
and replace it, maybe it's not sealing properly upon reinstallation. Maybe
use Rain-X on the inside?

When I returned the display under warranty I suggested that perhaps the
long vertical distance between the clamshell clamping screws allowed the
plastic to "bow" and not pinch the rubber gasket. JRC repair service
didn't comment. I do notice a 1/16" hole towards the bottom right of the
clamshell face that is the reset access, surely that is not "open to the
world"?
Inserting silica gel sacs or accessing the backside of the face glass
requires separating the clamshell halves and is not a thing I would want
to do as a regular maintenance chore, that is why I thought of the warm,
dry air method.
Dick

I had a similar LCD fog problem, slow baked it at a low temp, around 100 F, for
a week. Then put it in a ziplok freezer bag with a bag of freshly dried silica
gel dessicant, removed it after a few days, then applied liberal amounts of RTV
silicone sealant all over seams and anywhere else I thought moisture might be
getting into the display module. Has been OK for over a year. Kind of a sloppy
fix but it worked... so far.