On Thu, Jan 19, 2023 at 10:44:09AM +0100, Andreas Grapentin wrote: > > > > On 19. Jan 2023, at 10:06, Andreas Grapentin <andr...@grapentin.org> wrote: > > > > I started looking at the micro desktop board with my multimeter and did > > some checks, but it’s difficult without reference to a known good board. > > But what is maybe noteworthy is that of the three larger capacitors on the > > board just behind the power socket, both sides of all of them are connected > > to ground. I assume that part of the board is responsible for the power > > control? If so, then the small chip in the middle might be blown. Again, > > hard to verify without a known good board. > > I found the schematics for the micro desktop, and was able to take a closer > look. I tested around the RT8288A, and noticed that pins 1, 2, 3 and 8 have > basically zero resistance to ground. That’s not good. > > I’ll get a hot-air solder station and a microscope, and get that chip off the > board, then do some more tests to see if the other components around that > area are okay. It could also be that one of the capacitors nearby is blown. > > I’ll try to get this micro desktop back to working order, because I have the > suspicion that the power issues of the micro desktop are causing the boot > loops, and I don’t want to break anything else :) >
So we have two "active" testers with a broken micro desktop each. This is the thread where we discussed my power problems and the blown RT8288 in 2020 (see attachment and Lukes replies in the thread [a redesign of this area for micro desktop 1.8] and a schematic as attachment): https://lists.phcomp.co.uk/pipermail/arm-netbook/2020-July/016353.html Andreas, Do you want to accept Lukes offer for one of the five precious micro desktops? If you are done with your testing, you could send it to me. I am curious if my Computer Card is still working. Pablo _______________________________________________ arm-netbook mailing list arm-netbook@lists.phcomp.co.uk Configuration, options, subscribe and unsubscribe at: http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to: arm-netb...@files.phcomp.co.uk
