On the APM 2.5 opposite side of the ABC lights is a large blue LED with a smaller red led.  The blue should be solid while the red LED either blinks when disarmed or is solid if the motors are armed.

My problem is that when I plug in the battery neither the large blue or small red LED lights up.

I can get them on by unplugging the battery then plug in a USB cable into the APM wait for the blue and red LED's to come on then plug the battery in and then I can disconnect the USB cable. But no matter what when I plug the battery in first neither LEDs will come on. I have tried plugging in the USB cable while the battery is plugged in but those two lights remain off.  I have to unplug everything then power up the APM with USB before plugging in the battery for those two lights to come on.  Its not location either. I don't have to move the hexa around to get a lock, its in the exact same spot.

What exactly does the blue LED mean?

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Replies

  • Ok reflased the APM and it seemed to work but now it's not. Still doing the same thing.
  • so when you just plug in the battery is there any activity on the board ? or is it just the rx tx lights not coming on ?

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