Good morning,
That's quite an unfortunate situation. Firstly, have you diagnosed exactly what is wrong with your I/O board?
E.G:
* Has one of your USb-C ports failed?
* Has the SD card reader gone kapoof?
* Have they all just spontaneously died?
Also if you still have the infamous dell warranty, you may be able to get a replacement for this I/O board through Dell, otherwise you are kind of out of luck simply because they don't sell the I/O board directly through OEM. Based on the fact that the board seems identical to 9710, i recommend going to a site like eBay to look up a board for 9710 or 9720.