On Wed, 06 Jan 2021 09:44:02 +0000, Mike wrote:

> In article ,
> Andy Burns   wrote:
>>Tim Streater wrote:
>
>>> The Pi carried on being powered.
>
>>Unless a 4B is different to any other rPi, they never turn off, they
>>just halt.
>
> But, from the original post, which you snipped :-
>
>> A bit later I shut it down, **and then turned off the Pi power
>> supply.**
>> The Pi carried on being powered.
>
> Are you saying the Pi 4B is a stealth free-energy device? ;)

Its not. This just shows that, if there are common positive and ground
rails on the Pi's PCB that are connected to ALL sockets capable of
accepting a connection from an externally powered peripheral device,
which AFAIK is the case for all Pi models, then a Pi will remain active
as long as external device with a power source providing enough current
to keep the RPi alive is connected to it.

It also means that you can destroy a Pi by connecting it to anything
which requires more than 5v to operate and that has its positive and
ground rails connected to the plug it uses to talk to the Pi.


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Martin    | martin at
Gregorie  | gregorie dot org

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