Author Topic: External Monitor for 550D not working with USB-RCA cable  (Read 693 times)

dhlogic

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External Monitor for 550D not working with USB-RCA cable
« on: January 18, 2017, 11:29:30 PM »
Hello,

I have a Canon 550D and I am using the latest nightly build for my camera:

magiclantern-Nightly.2017Jan14.550D109

When running Canon firmware, the USB-RCA cable outputs video to external sources.

I'm having a problem when running the latest Magic Lantern build. When the camera is first turned on, I get a brief flash, but then nothing. Also when the camera's back LCD goes to sleep and I wake it up by pressing a button, I also get a brief flash on my external monitor, but then it disappears.

I saw years ago there was a similar problem reported and solved. It was described as a "redraw bug".

https://bitbucket.org/hudson/magic-lantern/issues/780/external-monitor-for-550d-not-working-with

Anything I can do to fix this? Thank you!

dhlogic

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Re: External Monitor for 550D not working with USB-RCA cable
« Reply #1 on: January 26, 2017, 07:50:27 AM »
Well, I tried some previous builds, including all the way back to the stable release v2.3 to see if I could get it to work. Unfortunately I was unsuccessful and the camera behaved the same as with the latest nightly build.

Does anyone else with a 550D have a problem using an external monitor via the USB-RCA cable like I am?

While a long shot, especially since it works with canon firmware, perhaps there is some sort of hardware incompatibility with the specific monitor/cable/camera I have when running magic lantern and should buy something else?

teatotalTED

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Re: External Monitor for 550D not working with USB-RCA cable
« Reply #2 on: January 26, 2017, 02:29:29 PM »
Try switching headphone monitoring off under the audio menu.

dhlogic

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Re: External Monitor for 550D not working with USB-RCA cable
« Reply #3 on: January 27, 2017, 05:14:40 AM »
Thank you very much for that tip. It works!

Perhaps I might have found it eventually, but you saved me a lot of time. Thank you.

The tooltip for audio monitoring says to turn it off if you use a SD display.

Anna Sharkaya

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Re: External Monitor for 550D not working with USB-RCA cable
« Reply #4 on: April 28, 2017, 03:23:37 AM »
Hi, i also have this problem but also solved according to follow method, but unfortunate  :'(my external monitor will going broken, do you have suggest for this? what's your brand of exernal monitor?