I want to provide 5v power to my tone board from a linear PSU via pins 1 and 21 on the 40 pin header. I know this will void my warranty. I can find documents which tell me what all the pins on the 40 pin header do. The 20 pin header is labelled on the PSU, to tell me which pins are physically which. The 40 pin header does not seem to be labelled, and it is not described in any Tone Board docs I can find. I know pins 1 and 21 are side by side at one end of the 40 pin connector. But are they at the “20 pin header” end of the 40 pin connector, or at the “I2S connector end” of the 40 pin connector?
I can find a labelled pinout image of the Khadas VIM, which I know the other versions of the Toneboard can sit on top of. I have a generic toneboard - if it has the same 40 pin header layout and I am interpreting this correctly, then pins 1 and 21 are at the “20 pin header” end of the 40 pin header, NOT at the I2S end - is this correct?