I have a b+ newly purchased that I'm slimming down for a handheld build. Ideally, I'd like to be able to solder my composite video connection to the underside of the board like I could with a model B. However, I can't find any diagrams for how the TRRS connector pins are mapped to location on the board.
If at all possible, I'd love to keep the actual connector open for a MTF plug to allow headphone input – short of that, being able to solder in the video and ground leads would be terrific. Not opposed to using the GPIO if that's possible either.
Trying to hook up an AFUNTA 4.3" display to a Raspberry Pi B+ without using the TRRS jack directly.