On 06 Jan 2021 at 12:10:01 GMT, Andy Burns  wrote:

> TimS wrote:
>
>>  Andy Burns wrote:
>>
>>>  What's relevant is that your monitor shouldn't be reverse feeding 5V to
>>>  the Pi
>>
>>  Agreed, if that's what its doing. Could be the other Mini, I suppose. I'll
>>  have to do some more testing.
>
> Wouldn't be the biggest surprise in the world if the a cheap switch box
> just commoned all the 5V pins together (since it can act as either a 2>1
> or 1>2 device, it'll be dumb).

Are these 5V signal or power? From what Joe said upthread, both ends need to
see the other. A 5V signal should suffice for that, I would have thought. No
need for the source to be offering to power the remote end.

> But a source HDMI device is expected to protect itself from an
> unexpected 5V arriving into its output, so no harm "should" occur.

A diode would suffice.

--
Tim

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