I felt inspired…
There are a few more pictures inside of the linked album but not much else to say besides, this may be useful for project in the future.
The monitor is meant for 12V from a car, as it’s a monitor for reversing cameras, but it was trivial to convert to 5v.
I was originally inspired by a youtuber who put a pi zero inside of an old pocket tv, I tried to do the same but bought a tv without composite input by accident; when I went through some datasheets I thought I had found somewhere to inject the composite signal but it didn’t seem to work, despite them using an identical circuit as listed as an example in the manufacturers datasheet.