I have APM 2. I had a crash and the board seems fine, when I plug in the USB to my computer, everything lights up and I can access Mission Planner. Keeping the USB in, if I plug in my lipo, I can arm the motors, and throttle up (motors spin normally). However, as soon as I unplug the USB from my computer (the lipo is still plugged in) the board goes dark, I cannot arm my motors, nothing happens. I just hear the beeps from my motors repeatedly. I checked all my wiring and everything is in perfect order. The jumper pin is in on the board to allow power from the ouput pins. What's happening?
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Check the soldering on the output pins, sounds like the 5v from the esc isn't getting to the board and as the servo connectors do stick up a bit perhaps one got hit too hard in the crash ?