Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: TimS Newsgroups: comp.sys.raspberry-pi Subject: Re: Pi power Date: 6 Jan 2021 13:25:33 GMT Lines: 29 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=fixed Content-Transfer-Encoding: 8bit X-Trace: individual.net BqwMt2i8z1msYuqiqBAFUAFK3H7dydhq+Z1c1t58cyd18nqIWV Cancel-Lock: sha1:fYjQ/UAh2styua7Zh+pBfEvlCu0= X-No-Archive: Yes User-Agent: Usenapp/0.96/l for MacOS - Full License Xref: csiph.com comp.sys.raspberry-pi:25542 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