Subj : Re: Homebrew pi400 To : Theo From : Daniel Date : Fri Dec 13 2024 23:55:00 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-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. --- SoupGate-Win32 v1.05 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3) .