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Narco 12D display problem

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Joined
Jun 12, 2014
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My last few flights I have noticed a problem with the red digital display on my old narco 12D display. At first I noticed that the first 1 (for example the active comm side 123.00) was getting dim, then I noticed that the 1 on the standby side was also dim. As the flight progressed the decimal disappeared, and the numbers on the nav side also started getting dim. I first saw this on my way to our week vacation spot. We arrived and didn't fly the whole week. On our way back, when we first started the trip, all digits were bright. As we flew however they started to dim again. Some digits remain bright while some dim, very confusing. Does this seem to be a display problem or a power problem? Anyone have and ideas?
 

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