Cessna Guy

Thanks, airframes aside, we all deal with the same avionics challenges and this group does a wonderful job sharing insights. Thanks for including me.

I’m having the problem as well. I did not have it with just the Pro Max PFD but when the MFD got installed it started. It happens on battery with the engine off and when engine is running. The only way I can get the noise to stop is to depress the Pilot Isolation button on the 340 audio panel. The sound is an electronic hum / Morse code sounding noise, extremely annoying. Has anyone successfully resolved the problem? Please advise.