MEGA65 PCB REV 3, what can go wrong? The board has been working for some while, no commentary back that something is bad. Yet there is a real PCB Bug!
The internal large SD card socket case is not connected to a common GND. This as result makes the Card Detect function fail. So as SD detect was not yet tested the error got unnoticed.
How to Fix?
Option 1:
Options 2, 3:
Options 2 and 3 do not need scratching the PCB they use short wire instead. Either wire 1 or 2 can be used, they do the same task.
