Teensy 4.1: Suddenly, 3V Pin only getting .17 V when connected to USB

J

jimmie

Well-known member
I have a Teensy 4.1 that has been working fine for a while. It stopped working all of a sudden without any changes to it.

I connected that Teensy to USB and nothing was detected. While connected to USB, I could measure about 5V on Vin. However, both 3V pins are only showing .17V.

Is the board damaged? What could case that?

Thanks in advance for the community's input.
 
I took the Teensy out of its socket. Still nothing ....

There is a "very remote" chance that pin 32 received 12V. If this happened, does this only damage that pin or the entire board?

Thanks.
 
12V will obliterate most semiconductors on the board in a few microseconds I suspect. Overvoltage damage is usually
fast and devastating to modern VLSI chips (gate oxide thicknesses measured in nanometres).
 
The gate-oxide electric fields involved are measured in MV/cm (megavolts per centimetre), once something goes,
it can cascade all through the chip as gate after gate fuses shorted.

In particular I wouldn't expect any 3.3V rated VLSI chip to survive about 4x its working voltage. 2x if you're lucky,
perhaps, not 4x.
 
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