Re: Bluetooth IC Overheats

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