So I set up and programmed my APM and sensors according to the directions. I ran a pre-flight test indoors without props and everything seemed perfect; motors spinning as expected, good GPS lock, sonar working, telemetry working, etc. I take it outside and power up and I can’t arm. I was thinking I failed the prearm safety check.
Went back inside. Tried to connect to Mission Planner over USB; connection failed . Tried to connect over telemetry; connected but it took a long time. HUD says no GPS lock. UBlox GPS unit has blinking blue LED and GPS test gives me lat. and long. so it is working fine.
I noticed that the ABC LEDs on the board aren’t doing anything. If I hit reset, the blue light blinks a few times and goes out. Red and yellow never light. RX/TX lights constantly flash. Now I can’t connect to Mission Planner at all. Not through USB or telemetry.
Checked fuse and it passes a continuity test.
Something is really wrong. Not sure how to diagnose this. Any help would be greatly appreciated.