Hello everyone,
I’d like to provide details about an issue we’re experiencing with the Teensy 4.1.
Main symptom:
The red LED on the Teensy blinks four times, then turns off, and repeats this pattern continuously. Additionally, the device is not recognized on the USB/COM port. No new connection appears when the Teensy is plugged in.
Recurring behavior:
This issue has occurred with other Teensy 4.1 boards as well, which had to be replaced.
Does anyone know what the four red LED blinks officially indicate? Is there a reference sheet or documentation we can consult for this? Any ideas on what might be causing it—crystal, flash memory, power supply issues, etc.?
Any help or suggestions would be greatly appreciated!
P.S.: Due to project specifications, the board is powered by an external source, so the pads that normally allow USB power have been cut.