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No I haven't. But I'm convinced it won't work unless specific code is written for this processor. In the end I used a Atmega 328p to talk to the TLC5940 and talked to the Atmega from the Teensy via i2c. It actually helped in that I could simplify the commands and put all the timing code (i...

Exactly the same issue here. I'm trying to use with Teensy 4.1. I believe from another thread that the TLC5940 uses MCU specific code for speed. Fingers crossed Teensy 4.x is added!

For what it's worth I appeared to have a dead board too... was blinking when I got it but never showed up in Teenyduino and could never upload to it. Did a hardware reset and ended up with no blinking. Eventually tried my 4th cable (all previous were proper USB, not just charging cables...