I can’t find any replacement parts for this device, but replacement units are currently [https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=google+home+mini&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=google+home+mini+housing&LH_BIN=1&rt=nc|trending on eBay] for $30 or less. Chances are if you found the parts to fix this, it would outweigh the cost of simply replacing it.