INTL 3:770/1 3:770/3
REPLYADDR theom+news@chiark.greenend.org.uk
REPLYTO 3:770/3.0 UUCP
MSGID: <14s*RDN1z@news.chiark.greenend.org.uk> 4ce7145d
REPLY: <34s*FvN1z@news.chiark.greenend.org.uk> 8b59c272
PID: SoupGate-Win32 v1.05
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-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

--- SoupGate-Win32 v1.05
 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)
SEEN-BY: 4/0 19/10 88/0 90/0 105/81 106/201 128/187 129/305 153/757
SEEN-BY: 153/7715 218/700 840 220/70 221/1 6 360 226/17 30 100 227/114
SEEN-BY: 229/110 111 114 200 206 300 317 400 426 428 550 616 664 700
SEEN-BY: 229/705 266/512 267/800 282/1038 291/111 292/854 301/1 310/31
SEEN-BY: 320/219 322/757 335/364 341/66 342/200 396/45 460/58 633/280
SEEN-BY: 712/848 770/1 3 100 330 340 772/210 220 230 880/1 900/0 102
SEEN-BY: 900/106 902/0 6 19 26 905/0 930/1 5020/400 5075/35
PATH: 770/3 1 218/840 221/6 341/66 902/26 229/426