K
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    • K
      If it is failing right at power on, I would suspect that it might be something on the input power side. I have seen reports where people have a 5V DC-DC converter powering the Teensy and if they hot plug it in (rather than plugging it in and...
    • K
      Is there any chance that the U1 3.3V regulator output is connected to the Teensy 3.3V pins as the pin labels seem to suggest? With a 5V VIN input, the Teensy 3.3V pins are outputs from the onboard regulator and should not be connected to a 3.3V...
    • K
      You said the same circuit worked OK with Teensy 3.2 but not Teensy 4.0. I am guessing that something about the signal characteristics like the logic HIGH levels, signal edge rates or drive strength are a little different and one or more of those...
      • SPI Series Resistor Modification.jpg
    • K
      Those series diodes are only used for compatibility with 5V signal sources. They drop the signal level by about 0.72V and since you are driving it with 3.3V logic, the logic high level is only going to be up around 2.3 - 2.6V or so which is...
    • K
      The X's like you see inside the symbols below typically denote a DRC error that needs to be corrected before fab. All SMD devices on the bottom side have these X's. Is there any chance that you flood filled the 12V plane on the bottom layer...
      • 1712681389606.png
    • K
      In his first paragraph he mentions melting plastic on the CPU, so probably safe to say "WAY TOO HOT". Seems like some kind of basic incorrect power issue to me. If you are using a footprint you found on-line, make sure that the pinout is...
    • K
      Can't really tell from the partial schematics, but for instance you have a MUXBREAKOUT block with the only power pin being 5V that apparently has analog signals coming back to the Teensy on a different connection. Do you know if these are...
    • K
      As already stated, you should only put 5V (3.6-5.5V) into the VIN pin. 3.3V is simply too low for it to function correctly. You show a possible connection to the VUSB pin. What is that connecting to if anything? Also make sure that none of...
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