Tuesday, June 29, 2021

MEGA65 SD Detect Patch

 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:

We need to scratch the solder mask off a bit, and then apply some solder to connect the SD Case to the GND plane.

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.