After rebooting, though, I could give rudder input and 2 motors would spin even though the Green LED was solid (indicating the "unarmed, safe to move" condition). Stranger still, I repower the board an hour later, and the heli initializes and I am able to arm it and the ESCs all work again. I even test hover over some grass. I land a bit hard and then the problem reappears.
Now at home, however, I cannot re-arm the board. Configurator does not show any Tx inputs. I know the Rx is good, since I switched it out with another known good one and double confirmed using a standard servo. My sensors all respond in Configurator. The board boots normally (flashing R G B, then solid Green).
I just do not know which board is damaged? I'm assuming it's the lower Mega board (since it's the one with the servo headers, plus it's cheaper), but want a more informed diagnosis.
Was fun while it lasted :^(
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If you have those bullet connectors between ESCs and motors, make sure to check they all have good contact.
In my case I found several of them were rotating freely also when mated, causing bad electrical contact. I soldered them up solid.
check all your connectors, check if all pins are correctly soldered on both (the red and the blue) board
check your motor connections, check ESC power connections
i don't think that one of your main boards is damaged