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Video goes black after throttle!
#1
Just finshed upgrading my current chameleon with some Wraith 32bit 35a escs running dshot 1200. Went to the park and when ever i go above 20% throttle my feed goes black but i still can see osd. Part list is, Dys f4 pro, tmotor f60pros, tbs unify pro v2, hs1177 and crossfire receiver. I have tried switching cameras, checking solder joints, adding caps, turning off amp protection in the escs. The video was working fine before i upgraded escs, could it be a setting in the escs? I really need to get this quad flying before saturday. Any help or ideas would be great!  Smile
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#2
The ESC settings can't affect your video camera.

What are you using to power the Unify Pro and the Camera?
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#3
(28-Sep-2017, 11:46 AM)unseen Wrote: The ESC settings can't affect your video camera.

What are you using to power the Unify Pro and the Camera?

The power for the camera and vtx are coming from the fc.
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#4
I don't have personal experience of this flight controller, but often, these onboard regulators that are supposed to be 3A capable fail to deliver. If you're running the Unify at high power levels, it could be enough to drop the regulator voltage low enough for the camera to drop out.

Alternatively, even though you've checked the connections, you might find that the power or video signal wires from the camera have broken internally or not been crimped properly.

I'd try swapping out the plug and wiring to the camera. It sounds like you've tried most other things!
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#5
(28-Sep-2017, 11:52 AM)unseen Wrote: I don't have personal experience of this flight controller, but often, these onboard regulators that are supposed to be 3A capable fail to deliver. If you're running the Unify at high power levels, it could be enough to drop the regulator voltage low enough for the camera to drop out.

Alternatively, even though you've checked the connections, you might find that the power or video signal wires from the camera have broken internally or not been crimped properly.

I'd try swapping out the plug and wiring to the camera. It sounds like you've tried most other things!

I have swapped the wire and plug for the camera, it didnt work. The unify is running 200mw. Im really lost  Sad
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#6
It's tricky to test for a fault that only happens in flight.

If you take your props, turn them upside down and then rotate the positions of the props clockwise by one motor, the quad will push down when you throttle up. That might at least allow you to try to reproduce the problem on the ground and connect a multimeter to the camera's +5V input to check if that's the problem.
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#7
(28-Sep-2017, 11:58 AM)unseen Wrote: It's tricky to test for a fault that only happens in flight.

If you take your props, turn them upside down and then rotate the positions of the props clockwise by one motor, the quad will push down when you throttle up. That might at least allow you to try to reproduce the problem on the ground and connect a multimeter to the camera's +5V input to check if that's the problem.

I could give that a go tomorrow, any thing else I could try inside?
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#8
You could certainly start by just measuring the 5V to the camera. If it's already marginal (like 4.8V or less) then that may be the problem.
Also, if you have a spare 5V regulator, you could wire that in and use it to power the camera independently and see if it makes a difference.

Sadly, if none of that helps, you're pretty much forced to suspect the flight controller. It may pay to examine the soldering for the OSD chip with a magnifying glass, just in case there's a poor connection to the video input on pin 22 of the chip.
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#9
(28-Sep-2017, 12:14 PM)unseen Wrote: You could certainly start by just measuring the 5V to the camera. If it's already marginal (like 4.8V or less) then that may be the problem.
Also, if you have a spare 5V regulator, you could wire that in and use it to power the camera independently and see if it makes a difference.

Sadly, if none of that helps, you're pretty much forced to suspect the flight controller. It may pay to examine the soldering for the OSD chip with a magnifying glass, just in case there's a poor connection to the video input on pin 22 of the chip.

Voltage is saying 4.90 Is that too low?

There is another 5v and ground I can use on the other side of the fc, I'm gonna give that a go
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#10
Changing 5v didn't fix the problem
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#11
I've not tested the HS1177 to confirm how low the camera's input voltage can go before it stops working, but if you have 4.9V and it stays there during flight, it should be high enough.

Have you tried adding a capacitor to the 5V line?
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#12
What happens if you link your cam directly to your VTX wihtout the FC/OSD being in between?
I'd check and see if this eliminates the problem.
If it does you know your FC is the source of your problems.
Check out my videos @ www.youtube.com/Marcelfint and let me know what you think!
[-] The following 1 user Likes Fint's post:
  • unseen
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#13
(28-Sep-2017, 12:56 PM)Fint Wrote: What happens if you link your cam directly to your VTX wihtout the FC/OSD being in between?
I'd check and see if this eliminates the problem.
If it does you know your FC is the source of your problems.

Should i link the video wire? The tbs unify v2 doesnt have a 5v for a camera.

(28-Sep-2017, 12:55 PM)unseen Wrote: I've not tested the HS1177 to confirm how low the camera's input voltage can go before it stops working, but if you have 4.9V and it stays there during flight, it should be high enough.

Have you tried adding a capacitor to the 5V line?

I havent tried adding a capacitor, should i try it?
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#14
Good suggestion from Fint. It would help to narrow things down.

Adding a cap might help, either on the power input to the flight controller (you'll need a 35V capacitor), or on the 5V supply to the camera. If the camera is shutting down due to a momentary dip in voltage, the capacitor will help prevent that.
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#15
(28-Sep-2017, 01:21 PM)unseen Wrote: Good suggestion from Fint. It would help to narrow things down.

Adding a cap might help, either on the power input to the flight controller (you'll need a 35V capacitor), or on the 5V supply to the camera. If the camera is shutting down due to a momentary dip in voltage, the capacitor will help prevent that.

I have a 35v capacitor on the power wires. Do i just solder the vid in and vid out wires together? Is that what fint means?
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