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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Homebrew pi400
Date: Sat, 14 Dec 2024 13:56:15 +0000
Organization: A little, after lunch
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On 13/12/2024 23:55, Daniel wrote:
> Theo <theom+news@chiark.greenend.org.uk> writes:
> 
>> Theo <theom+news@chiark.greenend.org.uk> wrote:
>>> The Natural Philosopher <tnp@invalid.invalid> wrote:
>>>> On 11/12/2024 16:46, Daniel wrote:
>>>>> Andy Burns <usenet@andyburns.uk> 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-500-m2-socket-install.jpg
>>> https://www.jeffgeerling.com/sites/default/files/images/pi-500-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

-- 
Canada is all right really, though not for the whole weekend.

"Saki"