Audi A6 Quattro (2006) MMI Not Powering up, Troubleshoot and fix

All Audi A6 Models around the year 2006. MMI boots and then shuts off. Monitor goes on and then black. None of the MMI control works. Failed component in the optical chain is the Amplifier which is water damaged. This leads to other videos in my channel for troubleshoot and find the root cause of the the water leak. The troubleshoot steps applies to similar Audi models. Hope this video helps you on troubleshooting similar problems. GL. btw, there are plenty of videos on how to "replace the audi MMI board". it is a prone to failure component with water/coffee spills from the top over time. I followed this one to replace it. It is time-consuming but really cheap for DYIs: https://www.youtube.com/watch?v=SH1PrInREi4&list=PLgqjEErmJIBwbCWwAI0bcvqNM6p8-T6Gj&index=4&t=0s