As for the analog A/V cable - it's always a good idea to have them at hand when all else fails. And such as in this case, at least for diagnostic purposes.
If you can solder, you could always make an A/V cable by yourself with a TRRS 3.5mm mini-plug cable and RCA connectors on the other end. The pinouts: https://i.stack.imgur.com/QTkwY.jpg
Also, a simple ...
To enable 1-wire run
and go to Interfacing Options -> 1-Wire
(This will add dtoverlay=w1–gpio at the end of /boot/config.txt. Default pin is GPIO 4. If you would like to use a custom pin you have to manually change this line to dtoverlay=w1-gpio,gpiopin=x where x is other GPIO pin number)
Reboot the Pi
To list all devices that Raspberry ...