KX-155 LEDs

One of my co-owners flew the plane a couple days after the digits vanished
on me. He said it worked fine. Hmmm.
I was very cold on my flight. Enough that I could see my breath. I wonder if
that had something to do with it.

"John Purner" wrote in message
.. .
Aaron,

I hate to press to much but I really need the help. How exactly do you
remove the displays?

Thanks very, very much

--
John Purner
Editor - The $100 Hamburger
http://www.100dollarhamburger.com
"Aaron Coolidge" wrote in message
...
wrote:
: John Purner wrote:
: : I have the same problem with one of my KX155's and my ADF. Funny
thing
is
: : that about five minutes after takeoff. The problem clears up. It
seems
like
: : low voltage, but it isn't.

: As I said it my post, I'm pretty sure that it's a pseudo-grounding
: of the high-voltage that runs the displays. They're not LED's, and
they
: require a fairly high voltage, which is easier to bleed off due to
: humidity. It's definately high enough to make you notice if you
: accidentally brush up against it!

: -Cory

John, Cory, try this:
Take the displays out. Burnish the silver contacts on the displays.
I used a pencil eraser. Note that the contacts are not gold, if they
were they would not tarnish. Put a bead of dielectric grease on the
display's contacts. This will create a gas-tight contact, and keep
the condensation from bleeding off the +150V used to light the
displays. Put the displays back in.

This is what Conrad up at the Radio Shop at KORH did to my KX155's
when I was having similar difficulties a few years ago. No further
problems.

--
Aaron Coolidge (N9376J)

Steven Barnes wrote:
: One of my co-owners flew the plane a couple days after the digits vanished
: on me. He said it worked fine. Hmmm.
: I was very cold on my flight. Enough that I could see my breath. I wonder if
: that had something to do with it.

I have seen a couple digits on one of my KX155's stop working in extreme
cold. I haven't been able to fix this, except by GENTLY pushing in on
the translucent lens, which makes them come back on. Usually by 1000' AGL
climbing out they're back on and stay OK for the rest of the day.
I suspect there are some questionable contacts that the extreme cold
makes, uh, more questionable.

--
Aaron Coolidge (N9376J)

Steven Barnes wrote:

One of my co-owners flew the plane a couple days after the digits vanished
on me. He said it worked fine. Hmmm.
I was very cold on my flight. Enough that I could see my breath. I wonder if
that had something to do with it.

Probably. I fly right down to -30 degC, and I notice that my KX-155
display gets extremely flakey on cold days until the plane starts to
warm up.


All the best,


David