I have an older PI-B that has been replaced with a VERO. I’ve connected the PI-B’s composite output to an old Sony TV but have issues with the color locking. Looking at the composite output with a scope I can’t see any issues with the NTSC signal it’s producing. The Sony TV works fine with a different composite source and the PI’s composite output displays fine on other TV’s.
This leads me to question. Can the PI be made to output separate luminance (Y) and chrominance © signals from the GPIO?
That’s probably more a question for the official Raspberry Pi forums
cc @popcornmix
It has been discussed on the PI forum but looks to be either difficult or impossible.
I thought possibly two DACs were used separately in the BCM2853 and the two analogue Y and C components where resistively combined with R44.
I would be happy with working composite into this old TV but can’t find any solution or info on that either.
Have you tried sdtv_mode?
http://elinux.org/R-Pi_Troubleshooting#Composite_displays_no_image