Jay Honeck wrote:
I have a 1967 172 with a MX 170B nav/com. I noticed not long ago that
the display was flickering from bright to dim. Now the radio will not
come on at all. Any suggestions.

Have you tried removing and re-seating it? I doubt it's that easy,
but you gotta try the easy stuff first.

The next step is to see if the display on the radio is seated (and the
connectors are clean). That's a frequent failure mode in the real
KX's with the discharge numbers.