What is GPIO_GRAPE_IRO_L on the Touch Connector responsible for?

Hi Karl,

What you'll want to do is search the entire schematic for all occurrences of GPIO_GRAPE_IRQ_L. Once you have all the pages that signal appears on, it will tell us everything it's connected to and where. As Tom pointed out, that's actually Q rather than an O; the acronym IRQ is generally used to mean Interrupt Request; i.e., an interrupt signal to the processor to handle something immediately; in this case it appears to be related to a touch event.

As far as the physical location of where that trace runs on the board, the Gerber files are what is used to map the schematic to the board view files; if someone has access to the board view files for your iPad, they would be able to follow that line from the pad to wherever it ends up and reveal if there is anywhere else it pops up that you could potentially run a jumper wire to, like a via or another component pin. I don't have that information myself, but it's possible some of our other contributors do.