I'm not sure I "solved" it, but here's how I got the flashing TX to stop.
Again, this is with a K3S, fw 5.50. Nothing attached to the rear panel, especially the ACC connector. LCD TX was constantly flashing.
Went into Config: TX Inh, which was set to Inh=LO. set Inh=Off. Flashing TX stopped, TX functionality restored..
Went back into Config: TX inh, and set it to Inh=LO again. The Flashing TX did NOT re-occur. TX functions.
Seems like there was some sort of TX Inh latch state that was cleared by turning TX Inh off or on.
Re-cabling the K3S, and no problems so far -- Our ACC cable has a 1K resistor to +5v on pin 10 (tx_inh). That is now being obeyed again.
-Brian N9ADG
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