I have purchased an onoff shim and having issues troubleshooting a problem I am having. It turns on via external momentary button and will shutdown but does not kill power.
Thinking it might have been my soldering I tested the onoff shim with a different pi and fresh rasbian and it works perfectly as it should (it therefore isn’t my soldering). With fresh rasbian image on the original pi it still doesn’t work as it should. Therefore, my conclusions is there must be something wrong with the gpio pins on the original pi. I had used the gpio pins for led’s previously. Is there any way to troubleshoot this to understand the hardware fault on the original pi?