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Thread: New Teensy 4.0 DOA No 3.3V

  1. #1
    Junior Member
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    Apr 2013
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    15

    New Teensy 4.0 DOA No 3.3V

    Hi,
    I bought a Teeny 4.0 back on 8/15/2019 and finally have gotten around to pulling it out of the bag and plugging it in.
    I have tried 2 known good USB cables. With each I measure 5.0V on the the Vin pin but 0.185V on the 3.3V pin.
    I have not soldered headers on it or done anything with it. There are no LEDs lit or blinking.

    Does anyone know what could be wrong?
    Thanks,
    Bill

  2. #2
    Senior Member+ defragster's Avatar
    Join Date
    Feb 2015
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    11,960
    First guess would be shipping damage. One of the needed parts knocked off in shipping perhaps. Do a close inspection of the board compared to the Teensy card or online image and account for the components. Perhaps upload decent top and bottom photos.

  3. #3
    Junior Member
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    Apr 2013
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    Click image for larger version. 

Name:	Teensy4NoBlink.jpg 
Views:	28 
Size:	179.7 KB 
ID:	20780 Here is the photo of the top and bottom of the Teensy 4.0. Thanks.

  4. #4
    Junior Member
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    Apr 2013
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    I have tried pushing the button several times with no change to the 0.185V at the 3.3V pin...

  5. #5
    Senior Member PaulStoffregen's Avatar
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    Nov 2012
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    22,278
    Was this purchased directly from PJRC? I believe most of the distributors didn't have them that early.

    If you can find the confirmation emails with your 6 digit order number, please reply to one of those. If you don't have the order number, please email me directly with some info we can use to try to look up your order.

  6. #6
    Junior Member
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    Apr 2013
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    Hi Paul, I emailed back to Robin with the original email that was sent went the package was sent out.
    The invoice number was 80288. I purchased it directly from PJRC.
    Thanks,
    Bill

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