Did have the same problem ones...reverse connection from the ESC connector to the APM.
Check your power distro and voltage out to APM/IMU, remember the red wire alwais is on center pin +
From top view connention is S + -
i've just checked the 2 wires (red at centerpin and black on bottom) with my multimeter and he says : 5,0 V
My power distro is good because the 6 esc makes all bip when Mission Planner make the test just after the firmware upload.
But i've a 3S Lipo for my Hexa. is it enough ?
No solutions for me ?? no test to do ??
i've seen 2 solder holes near outputs with + and - .. does they power the APM ? Does 5V works into this ?
Help me please..
Your wires likes right. Ardupilot damaged ??
I don´t know if have fuses.
What are those ESCs? Do they have proper internal BEC?
Have your checked that ESC will output 5V from middle pin? You said that you measured 5v from bottom and middle pin on ESC connector but how about when connector is connected to APM R/C Connectors. Do other pins also see this +5v? You should see +5v between every middle and lower pins at APM 3 row pinheader.
Yes there are + and - holes on side of the PCB but you cannot put 5v to there, it should be higher like 7.2v.
3S is enough for hexa.