I just changed my Diatone R349 flight controller because the old one broke. On my first test flight, I noticed the OSD is flickering very bad, sometimes losing it for more than 1 second, even when not armed.

The video feed is good, just the OSD flickering.

The VTX and camera are powered by an external 5v regulator. The rest is powered by the FC.

I've read that it could be a ground issue.

Could it be something else?

EDIT: This is my current hardware and wiring diagram. enter image description here

  • $\begingroup$ Hey @JoRouss, welcome to the community! What kind of hardware are you running now? Have you tried retouching the solder joints for power and the analog camera signal? Sometimes just re-melting the joint can fix issues with intermittent connections. $\endgroup$ – ifconfig Apr 30 at 21:44
  • $\begingroup$ @ifconfig Hey, I added my wiring diagram and hardware. What joint exactly could cause the OSD to flicker? $\endgroup$ – JoRouss Apr 30 at 22:01
  • $\begingroup$ I just noticed the capacitor is on the FC, not affecting the 5v regulator. This might be the problem? $\endgroup$ – JoRouss Apr 30 at 22:05
  • $\begingroup$ Nice diagram! Hrm, at this point it doesn't look like any solder joints you made assembling the quad could be at fault... If you look at your Mamba F405 FC board near the OSD chip, does anything look off? $\endgroup$ – ifconfig Apr 30 at 22:06
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    $\begingroup$ The capacitor would be suspect if the VTX was cutting in and out because that could mean that it's receiving too noisy power. Although, it is worth noting that where you have the capacitor it is likely doing nothing because only the Crossfire RX is being powered off of the FC's 5v pads. $\endgroup$ – ifconfig Apr 30 at 22:07

I fixed it by adding a common ground between the 5v regulator and the flight controller. I can't explain the science behind this, but I took the answer from this video from Painless360

The flickering is completely gone, even when I punch the throttle.

New wiring diagram: enter image description here

EDIT: I will leave the post unanswered until someone intelligible explains this, and maybe other OSD flickering causes just to keep the post general to the question and not specific to my hardware and wiring.

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