Power problem – APM 2.x will not power up

07/14/16

Problem – APM 2.8 will not power up via power module but will power up normally with USB cable from PC in Mision Planner.

After I tried to add a buzzer to my APM (ordinary HobbyKing buzzer) via the ground and signal pins #6 on the long 16 pin rail (analog input pins) – now my APM will not power up except by USB and PC.

What did I brake?

Piezo Buzzer for KK2 KK2.1 & Naze32 Flight Control Boards (1pc)

http://www.hobbyking.com/hobbyking/store/__47014__Piezo_Buzzer_for_KK2_KK2_1_Naze32_Flight_Control_Boards_1pc_.html

I tried a spare power module from my Pixhawk – same problem.

I checked voltages on power module 6 leads – same in both power modules -

5.05, 5.05, 3.9, 4.5, 0, 0

Did I burn out internal fuse?

Help,

Vince

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Vincent LaPorte July 14, 2016 at 7:40pm

SOLVED – APM 2.x - no power

I opened my APM control board and checked voltages after diode and found low value 1.49v

So I jumpered the diode with a small yellow wire.

Now powers up fine.

So I guess I fried the diode by applying the buzzer on the Accessory rail.

I will be more careful now.

Many thanks to all the excellent documentation on the web for this control board.

I have attached the information I found on the web and a photo of my repiar.

Luck,

Vince

check diode.doc

diode junper wire.JPG

https://storage.ning.com/topology/rest/1.0/file/get/3702268470?profile=original
Vincent LaPorte July 14, 2016 at 8:59am

Addendum:

I measured voltages on APM with power module power and ESC power on output rail -

Output rail 5.5v

Input rail 1.1v

Acessory rail 1.1v

Thanks,

Vince

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Problem - APM 2.x wil not power up

Piezo Buzzer for KK2 KK2.1 & Naze32 Flight Control Boards (1pc)

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