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BOFH excuse #325: Your processor does not develop enough heat.

sci / sci.electronics.repair / Re: Bluetooth IC Overheats

SubjectAuthor
* Bluetooth IC OverheatsJohn Keiser
+- Re: Bluetooth IC OverheatsAdrian Caspersz
`* Re: Bluetooth IC OverheatsHW
 `- Re: Bluetooth IC OverheatsJohn Keiser

1
Subject: Bluetooth IC Overheats
From: John Keiser
Newsgroups: sci.electronics.repair
Organization: Newshosting.com - Highest quality at a great price! www.newshosting.com
Date: Sun, 8 Dec 2024 23:57 UTC
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From: johnkeiser@juno.com (John Keiser)
Subject: Bluetooth IC Overheats
Newsgroups: sci.electronics.repair
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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?

Subject: Re: Bluetooth IC Overheats
From: Adrian Caspersz
Newsgroups: sci.electronics.repair
Date: Mon, 9 Dec 2024 07:15 UTC
References: 1
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From: email@here.invalid (Adrian Caspersz)
Newsgroups: sci.electronics.repair
Subject: Re: Bluetooth IC Overheats
Date: Mon, 9 Dec 2024 07:15:39 +0000
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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

Subject: Re: Bluetooth IC Overheats
From: HW
Newsgroups: sci.electronics.repair
Organization: A noiseless patient Spider
Date: Mon, 9 Dec 2024 10:52 UTC
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From: none@no.no (HW)
Newsgroups: sci.electronics.repair
Subject: Re: Bluetooth IC Overheats
Date: Mon, 09 Dec 2024 11:52:21 +0100
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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?

Subject: Re: Bluetooth IC Overheats
From: John Keiser
Newsgroups: sci.electronics.repair
Organization: Newshosting.com - Highest quality at a great price! www.newshosting.com
Date: Mon, 9 Dec 2024 17:54 UTC
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From: johnkeiser@juno.com (John Keiser)
Subject: Re: Bluetooth IC Overheats
Newsgroups: sci.electronics.repair
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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.

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