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Thread: Teensy shutdown when SD card is inserted

  1. #1
    Junior Member
    Join Date
    Aug 2020
    Posts
    3

    Teensy shutdown when SD card is inserted

    Hey guys,

    I have been having the weirdest of behavior happening to me right now. I have ordered a bunch of Teensy 4.0 and audio boards, I assembled them correctly and see no short circuit on my assembly. The teensy boots just fine but when I insert an SD card before turning on or after the teensy shuts down. As if the SD card is causing some sort of short circuit ?
    I have two copies of teensy 4.0 audio shield built in the past sitting in front of me that behave as expected but this new batch (2 attempt so far ) show the same behavior ! SD card on => Teensy doesn't turn on.

    Any ideas ?

    Thanks in advance

  2. #2
    Junior Member
    Join Date
    Feb 2021
    Location
    Mclean VA -- West of DC
    Posts
    10
    Quote Originally Posted by shirogeek View Post
    Hey guys,

    I have been having the weirdest of behavior happening to me right now. I have ordered a bunch of Teensy 4.0 and audio boards, I assembled them correctly and see no short circuit on my assembly. The teensy boots just fine but when I insert an SD card before turning on or after the teensy shuts down. As if the SD card is causing some sort of short circuit ?
    I have two copies of teensy 4.0 audio shield built in the past sitting in front of me that behave as expected but this new batch (2 attempt so far ) show the same behavior ! SD card on => Teensy doesn't turn on.

    Any ideas ?

    Thanks in advance
    Did you ever figure this out? I think I know what your problem is -- the Audio Shield is too close to the Teensy and C29 (I think) touches the grounded metal of the SD card frame, shorting +3.3V to ground. I came here to make a post to this effect, which I guess I'll do! --BE

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