Nexus 7 doesn't support MHL or full USB On-The-Go, but that's partly Google's call - The Verge
Asus Nexus 7 (2012/2013) Micro USB Port Repair
100% Genuine Usb Charger Port Connector For Google Nexus 7 Charging Port + Audio Headphone Jack + Flex Cable Replacement Parts - Tablet Lcds & Panels - AliExpress
Resurrect a Nexus 7 (2012) to run as good as new - Discussion - cd-rw.org