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Recent content by mmu_man

  1. M

    Powerbook 170 not powering up

    If only we had schematics for those… I'm not sure what the original intent is for this diode, I'd have to open one of the powerbooks I have here that needs fixing but I don't have the time right now. If it's just for reverse polarity protection any of those 1N would do I suppose. Not sure about...
  2. M

    Powerbook 170 not powering up

    These 1N400x are meant as rectifiers, they can have high reverse voltage (400V for 1N4004, 1000V for 1N4007) and can forward 1A (50A surge), so probably enough to trip PSU's short circuit detection if there's one for reverse polarity, but if not they'd still blow up anyway. It's odd they didn't...
  3. M

    MAXOPTIX OPTICAL DRIVE with a blown capacitor? Help sought

    Wow, a company answering someone about an antique device ? A first for me 🙃 Maybe they'd go as far as publishing schematics? 🥺
  4. M

    Rayovac 4.5 battery replacement hack

    Ah yes I remember breaking into the same one some years ago… With patience and a good cutter. I think the coin cell might actually fit the original case even.
  5. M

    WIP: SprintLayout (.lay6) import in OpenBoardView for logic board diagnostic/repair

    Aaaaaaaand we have an outline \o/ Much cleaner with some trigonometry to approximate the arcs. Still some holes not hollow, maybe some duplicated points somewhere…
  6. M

    Reverse Engineering the Macintosh LC III Logicboard

    Did you look at the DIN connector yet? There are 3x16 ones on aliexpress that might be cut in two halves I suppose (one requiring some more filing on the plastic key). It should be possible to make a small PCB as cutting rig with marks on the silk screen.
  7. M

    Reverse Engineering the Macintosh LC Logicboard

    My LCIII seems to be okay on the plastic side of things… Maybe some batches had different sources for molding? Or maybe it's just the storage conditions (my bedroom) that suits it better? The only thing I recall is one of the angled tabs retaining the logic board that was a bit lose, and if I...
  8. M

    WIP: SprintLayout (.lay6) import in OpenBoardView for logic board diagnostic/repair

    Ok, trying to get the outline isn't as easy as I thought, of course it's not just a nice polygon; but a discontinuous set of polylines + arcs out of order…
  9. M

    WIP: SprintLayout (.lay6) import in OpenBoardView for logic board diagnostic/repair

    Well in theory you can also do it in KiCAD, though it may be less streamlined and might complain about missing netlist. This Hackaday article mentions some way to do it in KiCAD: I suppose some plugin could make this even simpler. It should also be possible to write KiCAD importer, although...
  10. M

    WIP: SprintLayout (.lay6) import in OpenBoardView for logic board diagnostic/repair

    I recently helped reverse-engineering the Teboview (tvw) format to add support for it in OpenBoardView / FlexBV (Paul Daniels' closed fork which adds some features like both sides at once). Those are heavily used by people like Louis Rossmann to repair laptops, by making it possible to browse...
  11. M

    Eagle vs. KiCad

    KiCAD made a lot of effort on their standard library in the recent years, it used to not be very stable before. Also, the documentation mentions importing Eagle footprints, but I never tested this.
  12. M

    LC III - No video, no sound, and weird schematic

    Yes from the schematics R5, R6, R7 and R8 have a common trace between them.
  13. M

    LC III - No video, no sound, and weird schematic

    I don't have time this week-end (I opened it but had to close it back to make room), I'll have a look next week.
  14. M

    Pin Matrix for PPC ZIF modules?

    Well LTT managed to do that with broken CPU pins…
  15. M

    Pin Matrix for PPC ZIF modules?

    Depending on the dimensions you might be able to replace that with things like these SMD pin headers maybe…
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