The answer to CRT on the Raspberry Pi is CTIA, not OMTP #raspberypi
11When I found out that you can connect your Model 1-4 Raspberry Pi to a CRT using an AV cable with a 3.5mm TRRS phone connector, I was excited to try out. That's when I ordered one of those cables from Amazon, only to then find out that the cable doesn't work on my RPI, as all I got was a high noise and a messy-looking monochrome screen as I show you in the video. At first, I felt like I've been ripped-off due to the wrong cable that I got, until further research into it made me realize that what the Raspberry Pi supports is CTIA, and the cable that I got for it is OMTP, which means, I needed a CTIA-coded AV cable, not an OMTP one. In other words, CTIA means Left, Right, Ground and Video and OMTP means Left, Right, Video and Ground. That is when I learned about an adapter that swaps the Video and Ground rings and converts the cable to CTIA, and vice versa if the cable happens to be CTIA. That's when I knew that it finally worked and I can enjoy using my RPi on an old-fashioned CRT.