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SJRC F22 suddenly shuts off (Flightcontroller issue?)

AVRAddict

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Sep 22, 2024
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Hi everyone!

I hope that someone can help me with an issue I'm having with my SJRC F22 quadcopter. I recently tried to install db122fpv module (a RemoteID transmission device that sits in between the GPS module and the Flight Controller Board). I removed the GPS board from the quadcopter and I connected it to the module. I powered up the module and the GPS module using an external power supply and verified that everything worked correctly. Next, I put both modules back into the quadcopter, and connected the db122fpv to the flight controller.

After powering on the drone, I noticed that the leds of the db122fpv weren't turning on. I quickly powered down the drone, and checked the wiring from the FC towards the db122fpv. I noticed that I made a mistake when I was rewiring the connector coming from the flight controller. :( After correcting the error, I've powered up the drone again (without closing it up) and everything seemed to be working properly. After I put everything neatly inside the housing of the quadcopter- I closed it up again.

From this point on it refuses to finish it's power-on cycle. Holding the on button (for a few seconds) sets off the start-up procedure and gives me the familiar 3-tone piezo sound. (the same sound that the MJX bugs drone makes btw). I notice that the propeller leds turn on briefly- but quickly after that- the quadcopter shuts off. I disconnected the db122pfv - but the problem remains the same. I tried another battery, but the problem persists. However, when supplying 11v directly to the FC board (using external power supply)- the drone actually finishes it's start-up procedure and seems ready for action...

I'm trying to comprehend what's happening here. Any help diagnosing this problem or pointing me in the right direction is grealy appreciated!
 

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