Cannot get installed system to output component video, but NOOBS can

Question

Background: Pi 3 B+ connected to an old tube TV with front composite video connection.

I've installed NOOBS on a 32GB microSD card, and am able to successfully boot it, using the keyboard 4 key (NTSC) to display the graphical installer. After the install finishes and the Pi boots, I can no longer get any video to display.

I have set sdtv_mode=0 and hdmi_ignore_hotplug=0 in the config.txt on the /boot partition of the SD card.

Answer 1

According to the forum topic posted here, the newest version of Raspbian (Buster) had an option added to support the Pi 4 that broke component video out. Downgrading my Raspbian version and using a bare install solved this issue for me.