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.

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John Purner
Editor - The $100 Hamburger
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wrote in message
...
Steven Barnes wrote:
: Heh, on the way back from the avionics shop to get the IFR cert done and
a
: new VOR head installed, the LEDs went out on our #1 comm (KX-155). The
first
: 2 digits ( 121.9, the 12 is gone). Just went out in flight. What is
: involved in replacing the LEDs? Is it the whole cover?

Along those lines, I was wondering if anyone had any suggestions
for my KN-53 Nav. It's got similar plasma display as the KX-155, but
blanks out when it's really humid in the plane... like after a rain and
it's cold and damp in there. I took the lid off and snooped around for
cold solder joints, but couldn't find any. Upon poking around, I grounded
the high-voltage (using my fingertips... slightly unexpeted... yeoch!).
That blanked the digits too... SO, I'm thinking that it's a high-impedance
"short" when it's humid that kills the HV drive for the display. Any
thoughts on a coating, spacer, insulator? Sound plausible?

Thanks,
-Cory

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