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Thread: Teensy 3.5 broke (?)

  1. #1
    Junior Member
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    Teensy 3.5 broke (?)

    My Teensy 3.5 board stopped working. Computer doesn't detect it, when I power it there's 0V on GND pins, and 3.3V on 3.3V pins, but all other pins are at approx. 0.12V according to my multimeter (I don't have a scope). The strangest thing is that it was working before I put it on the shelf, it was lying there untouched for approx. a month and now it's not working. I checked USB cables and tested everything on 2 different computers just to make sure, got the same result. Do anyone has any idea what could have happened?

  2. #2
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    Are you using the same USB cable used previously ?? Did you try a different cable (in case you grabbed a charging-only cable - no data lines) ??

  3. #3
    Senior Member+ defragster's Avatar
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    Very odd and not understandable from the info presented ... Not sure where a T_3.5 is - but expect when I found it after however long it would power up working.

    First guess is a visual inspection against a PJRC published image [ Card or pjrc.com ] to make sure no components got knocked off or damaged. Luckily no bottom components to sorry about ...

    Is anything soldered to the Teensy?

    <edit> I left before posting before - now cross posted.
    Seems it isn't making 3.3V output - so something is not right on the board it seems? Any help if powered and holding the 'Button' for "15" seconds then release to do a Restore to blink? Time is measured say 14-16 seconds for triggering that.

  4. #4
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    to be precise, in case I worded it confusingly - the 3.3V otuput pins are 3.3V... the IO pins float around 0.12V

    I tried resetting and it didn't work...
    and I'm not the most eagle-eyed person, but I can't see any physical damage to the board

  5. #5
    Senior Member+ defragster's Avatar
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    Opps - misread - 3.3V where expected is good.

    Restore : I have had to try it a couple times in the past to get back to blink. T_4.x with Red LED is nice to see progress/timing - T_3.5 a bit more trials sometimes.

    If plugged in holding button - then short pause - release - does it register as 'in bootloader' on Teensy Loader? Then time and hold 15 seconds for Restore?

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