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  • Bluetooth IC Overheats

    From John Keiser@21:1/5 to All on Sun Dec 8 23:57:08 2024
    I buy lots of stuff from AliExpress or Temu. Some doesn't work and I
    get a prompt refund. Sometimes I can fix the device - i.e., cold solder
    joint.
    I recently bought a simple Bluetooth receiver [to play Spotify on an
    old stereo] using a common IC: PNSA15E7E.
    The red lights stay on, never gets to pairing mode. I tried resetting
    but no joy.
    Got my refund.
    Opened the case.
    Multilayer board, very, very few components.
    IC runs extremely hot to the touch. Ouch level.
    Resoldering didn't help.
    My WAG is maybe a bridged trace in a hidden layer or just a bad IC?
    Out of curiosity, any better guesses?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Adrian Caspersz@21:1/5 to John Keiser on Mon Dec 9 07:15:39 2024
    On 08/12/2024 23:57, John Keiser wrote:
    I buy lots of stuff from AliExpress or Temu. Some doesn't work and I
    get a prompt refund. Sometimes I can fix the device - i.e., cold solder joint.
    I recently bought a simple Bluetooth receiver [to play Spotify on an
    old stereo] using a common IC: PNSA15E7E.
    The red lights stay on, never gets to pairing mode. I tried resetting
    but no joy.
    Got my refund.
    Opened the case.
    Multilayer board, very, very few components.
    IC runs extremely hot to the touch. Ouch level.
    Resoldering didn't help.
    My WAG is maybe a bridged trace in a hidden layer or just a bad IC?
    Out of curiosity, any better guesses?

    Bad IC, probably on its second life having been recycled from somewhere
    else, and didn't enjoy being reborn....

    --
    Adrian C

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From HW@21:1/5 to All on Mon Dec 9 11:52:21 2024
    On Sun, 08 Dec 2024 23:57:08 GMT, "John Keiser" <johnkeiser@juno.com>
    wrote:

    IC runs extremely hot to the touch. Ouch level.

    Power supply backwards?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Keiser@21:1/5 to All on Mon Dec 9 17:54:10 2024
    HW wrote:

    On Sun, 08 Dec 2024 23:57:08 GMT, "John Keiser" <johnkeiser@juno.com>
    wrote:

    IC runs extremely hot to the touch. Ouch level.

    Power supply backwards?

    Runs off of a USB port so unlikely to be miswired.
    Thanks.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)