robws

This is what I am leaning towards, that we are getting essentially a ground loop through the processor. We have checked several failed teensies and the two we checked had IO pins which also were failed (eg 4 ohms VS the 38-40K ohms we see on...

- The 24V base power supply is AC connected, with earth ground - We have had these failures when the board is not connected to any external ports (we control motors, collect signals, etc) but they translators on both inputs and outputs.

Attached please find the power subsystem, as well as the main processor block. The overall board is fed by a 24V power supply (high quality) which is then broken down into 12, 5 and 3.3V. I will check the 5V startup, but in the past its pretty...

Hi Bill, thanks for the thoughtful reply. - Our 4.1 design is a full 3.3V compliant design, with 5V translators where appropriate. - On the diode issue, there was a post in these forums somewhere around backfeed from the 3.3V internal supply...

We have experienced ongoing failures of Teensy 4.1 modules in our system over the last 18 months. These failures appear random and arbitrary except: 1) Never fails during normal operation. In other words once up and running fine during that...