That is made on to the beaglebone.  If you open up the miner it just pulls out. Just make sure you do not bend the pins and there are a lot of them. Last one I changed I did not even remove the board from the miner.  just pull straight up on it.   Almost plug and play.  


https://www.bitmaintech.com/productDetail.htm?pid=00020160105102242316JqapyMif0705


$50 bucks on bitmain but paying and shipping is a hassle.  I have seen people reselling them on ebay also.. Search for beaglebone s4 or BB s4.  The firmware is miner specific I believe, same hardware for all but need to make sure it is correct for your miner.

Best of luck.