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   RBERRYPI      Support for the Raspberry Pi device      21,939 messages   

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   Message 21,162 of 21,939   
   The Natural Philosopher to Daniel   
   Re: Homebrew pi400   
   14 Dec 24 13:56:15   
   
   INTL 3:770/1 3:770/3   
   REPLYADDR tnp@invalid.invalid   
   REPLYTO 3:770/3.0 UUCP   
   MSGID:  01cfc677   
   REPLY: <87wmg32l63.fsf@rpi3> 9e26df4b   
   PID: SoupGate-Win32 v1.05   
   On 13/12/2024 23:55, Daniel wrote:   
   > Theo  writes:   
   >   
   >> Theo  wrote:   
   >>> The Natural Philosopher  wrote:   
   >>>> On 11/12/2024 16:46, Daniel wrote:   
   >>>>> Andy Burns  writes:   
   >>>>>   
   >>>>>> Daniel wrote:   
   >>>>>>   
   >>>>>>> Jeff did a teardown on his second channel and soldered a m.2 socket   
   >>>>>>> hoping it was properly designed. He found the power lines weren't   
   traced   
   >>>>>>> in so no power.   
   >>>>>>   
   >>>>>> There were some nearby component missing too, maybe the Rev1 board has   
   >>>>>> bugs, and they need a Rev2 (or whatever) but his soldering job looked   
   >>>>>> relatively clumsy (bridged pins etc).   
   >>>>>   
   >>>>> Yeah, it was pretty bad, at least he was honest about it.   
   >>>>>   
   >>>>> I am sure things were missing to keep the circuitry disabled and I'm no   
   >>>>> engineer.   
   >>>>   
   >>>> Why would you put support chips on if you were not going to install an   
   >>>> M.2 socket anyway?   
   >>>>   
   >>>> I think he called it right in that this is a bare bones model, and more   
   >>>> upmarket versions will emerge in due course.   
   >>>   
   >>> Looking at:   
   >>> https://www.jeffgeerling.com/sites/default/files/images/pi-5   
   0-m2-socket-install.jpg   
   >>> https://www.jeffgeerling.com/sites/default/files/images/pi-5   
   0-pcb-bottom.jpeg   
   >>>   
   >>> I think there's a MOSFET and some decoupling capacitors missing (to the   
   left   
   >>> of the middle larger hole), so the power isn't connected.  There may be a   
   >>> pair of missing capacitors in series with the PCIe lane, but I can't   
   >>> immediately see the footprints for those.   
   >>   
   >> Ah, I see them now.  To the right of the spot on the silver chip are four   
   >> tiny spots for passives, oriented at compass bearing 135 degrees.  I can't   
   >> tell from the photo or video whether they're populated or not, but those   
   >> will be the series capacitors.   
   >>   
   >> Theo   
   >   
   > I'm going to wait for someone to hack a working solution then copy   
   > it.   
   Wait for the Pi 501...with it all one the board already   
      
   --   
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   "Saki"   
      
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