Help No video through my FC

[Quad__]

Hello everyone,

I cannot seem to get my FPV video to pass through my FC. I get a picture when it's connected directly transmitter to camera (no FC) but when I connect the video wire to video in and out on my FC, I get a black screen on my goggles and no OSD.

Is there any settings I change change on BF (I've checked, and my OSD is on) it is my FC need replacing.

Thanks

[Coyote]

I think we need a lot more details to really make any suggestions, like what make is the FC ? have you any wiring pictures ? What grounds are you using in the video path ect

[Quad__]

I'm using a MAMBA F405 mini FC, runcam micro swift and runcam tx200u, the quads a diatone R349.

Here's a picture of my wiring, but for my camera the red is video and the yellows voltage.

And what do you mean by which grounds am I using?

[CurryKitten]

All the board layouts for the f405 I can find have 12 pins on the side you are connecting your camera and VTX, but this board has 14.  Do you have a link to the schematics ?

[Quad__]

Yes this is the schematics

[CurryKitten]

The wiring looks ok (I can't see where the VTX is connected - but assuming you've connected that up correctly)

Usually, a blank screen would suggest that the VTX is putting out a signal, but is transmitting nothing... i.e it's not getting an image from the camera.  Any chance you'd connected that signal to 5v at some point? (which may well murder it)  I would really try and stick red to power if I were you - else it can get a bit confusing.

It's easy to pin down the problem with the aid of a spare camera and/or VTX but I'm guessing these aren't to hand.  In which case you could see if the camera is working by powering it whilst connecting the GND/Video out to a composite video connector and sticking that into a compatible monitor/TV

[FPVSteve]

is the lens cap off? :)

[Quad__]

Yes the VTX is connected properly since I didn't mess with it, and it's still as it came.

Do you mean connect the camera to an external 5v and GND? Because I've done that, I connected both the cameras and VTX to an external GND and power (not on this FC) so only had my video cable running through the FC. It produced an image but no OSD.

Also the tried the this camera and VTX on another FC, and an image and OSD were produced.

Additionally I do have a spare camera and VTX, if you want to try something else.

And yes, my lens cap is off :)

[CurryKitten]

So you connected GND/V of the VTX and camera to an external source, but left the video.  So camera going to VI and VO to VTX?  If that's the case (ignoring the OSD of lack of) it sounds like the camera isn't getting power on your actual FC.  Have you checked the voltage if you check the FV GND/5V connections for the camera ?

[Quad__]

Yeah it seems my camera and/or VTX Isn't getting power on my FC, eventhough I've checked it with a multimeter and I'm getting 5v, on my 5v pads on my FC.

What could be the cause of this?

[ched]

Double check you are also getting 0V on the pads you are using!!! As if you only have 5v and no 0v it wont work! i.e. put the multimeter between lipo 0v (as close to lipo as possible) and test 5v then put multimeter on 5v and test to 0v.

[Quad__]

I'm not to sure I get what you mean, I've checked and I'm getting 5v on all the 5v pads on my board even if I'm not using them.

[ched]

To check a voltage with a multimeter you have 2 probes. To test the 5V you put the black (0v) probe to a gnd pad then the red tests the 5v pads to see what voltage is between the two test points.
But you also need to test the 0V pads. So you put the red lead on a 5v pad then the black one on each gnd/0V pad. They should all show a reading of 5v between the probes on the multimeter.

A multimeter in voltage mode tests the difference in voltage between the probes. Ultimately test the 0V (to black probe) and the 5V (to red probe) on the ones that actually feed your camera then the vtx ones.

Hope that helps?