On Nov 3, 3:05 pm, Jack 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.

TKM will not release the service manuals so all work is done at the
factory. Lucky for you the 170 *B* is still supported. I have the
original "MX-170" and the factory refuses to work on it so its a door
stop.

-Robert