I recently shippped a sensor product of about 150 units based on Teensy 3.2. Of that batch, I was unable to flash or connect with four of the T3.2's. The Vin/USB trace has not been cut. I'm using TeensyDuino Teensy to flash a fixed .hex file while the T3.2 was loose and not mounted on the board. The only thing I had done was solder male headers, including the underside 2x7's prior to flashing (yes, lots of soldering).
Anything I should try or check? Blink does not appear to be loaded or at least doesn't run when USB applied. Are these possibly defective?
Anything I should try or check? Blink does not appear to be loaded or at least doesn't run when USB applied. Are these possibly defective?