Hello and welcome.
I just bought some PI4 for an art installation for which I need the RCA composite video output. I tested the same procedure with PI3 and it works awesome. Now, with the PI4 it seems like the PI can't output the GUI through RCA. Console mode (CLI) works fine, but it seems like there is some problem with the composite out.
Steps I did in config file:
Also with this settings, when I'm in the NOOBS menu (after pressing shift while boot) usually I can switch to RCA PAL or NTSC with 1,2,3,4. Now with the PI4 it doesn't work. I can stille see that something happens on the TV, but it just flickers. After turning back to hdmi everything crashes and the screen shows a crash dialog (photo attached)
In the CLI mode I can boot the PI, but when I try to do something GPU related (like open a video file), the command line shows me the data about the video but not the video itself. After couple of time trying this the PI crashes.
I need it so badly, the art installation is already in two weeks. If some could help me, that would be awesome.