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  1. Replies
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    If you have multiple rails on the secondary side...

    If you have multiple rails on the secondary side shorted to ground, you'll need to start pulling parts off the power rail until the short goes away. I'd suspect the mosfets/transistors were the...
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    Iron wattage depends on what you're doing. For...

    Iron wattage depends on what you're doing. For SMD work, a 40W iron can be sufficient, but for through hole stuff, a 60-80W iron can be needed due to power and ground planes sucking all of the heat...
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    Tripping the breaker could be a couple of things....

    Tripping the breaker could be a couple of things. It could either be leakage current to ground, or it could be the inrush current of the power supply when initially turned on causing it. You could...
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    Check ALL of the capacitors, even the tiny ones...

    Check ALL of the capacitors, even the tiny ones buried down under things. If the entire secondary side of the supply went away, it's most certainly something wrong with the primary side.

    When you...
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    If you have a Walmart near you, they have a...

    If you have a Walmart near you, they have a Hypertough 44 piece precision bit set with an extender that works great on compact macs, and it's cheap.
    ...
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    Found the problem, the PLCC socket the ASIC...

    Found the problem, the PLCC socket the ASIC resides in had bad solder joints. I was going crazy tracing out the board since there's not really that much between the memory slots and the 68000, just a...
  7. IDE/ATA is basically the ISA bus with some...

    IDE/ATA is basically the ISA bus with some buffers. Early disk controllers had little in the way of fault detection and misbehaving hard drives could and did often take down the whole machine. Though...
  8. The plastic base is more of a pin carrier than...

    The plastic base is more of a pin carrier than structural support, as you've found out breaking a pin off. Most of the structural support comes from being soldered to a PCB.

    The "breakable" pin...
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    Well after a year working on the board on and...

    Well after a year working on the board on and off, I got it to boot reliably and the garbage on the screen went away. The problem? One of the caps was an incorrect value, unbelievable that a single...
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    I'd assume it'd be like any other hard drive, the...

    I'd assume it'd be like any other hard drive, the less you use it, the longer it'll last.

    If 30+ year old SCSI/MFM/RLL/ESDI/IDE hard drives are anything to go by, I'm sure that a good number of...
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    The large caches are needed for the SMR...

    The large caches are needed for the SMR housekeeping itself, it doesn't help at all with backed up I/O requests from the disk controller. To buffer even a couple of seconds of I/O from the host...
  12. The first "brrrrt" is the protected mode floppy...

    The first "brrrrt" is the protected mode floppy driver loading. The subsequent "chuk chuk chuk" sound is Windows trying to find a file on the drive. This can be verified when you insert the floppy...
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    SMR drives cause any RAID setup to fail. RAID...

    SMR drives cause any RAID setup to fail.

    RAID controllers have no concept of what SMR is, and when a drive starts doing SMR housekeeping, the RAID controller falls flat on its face because the...
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    If you can find a drive without SMR, it's fine....

    If you can find a drive without SMR, it's fine. With SMR, it's a dumpster fire.
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    The memory test that Macs do is very basic, bad...

    The memory test that Macs do is very basic, bad memory can easily get past it, especially at higher address ranges. I have had plenty of problems with bad memory on Macs not being found by the Mac...
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    If two different system installs are behaving the...

    If two different system installs are behaving the same, I'd say there's a fault with the machine. You may have bad RAM, which is an unfortunately common problem on these old machines.

    There's...
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    Yeah those have been popping up all over Ebay.

    Yeah those have been popping up all over Ebay.
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    Not sure off hand, but they're usually pretty...

    Not sure off hand, but they're usually pretty standardized sizes. I don't keep many X2 capacitors around because they don't go bad that often, and I don't usually repair power supplies old enough to...
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    220, 330, 470 and 680nF X2 capacitors are common,...

    220, 330, 470 and 680nF X2 capacitors are common, as are larger 1 and 2uF types.

    But those aren't the only types of caps that can fail, electrolytics fail as well and you really can't have enough...
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    You need to upgrade that CPU, it's painfully...

    You need to upgrade that CPU, it's painfully slow. The D630 will take up to a T9500 and have a massive performance boost.
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    Most AT style motherboards will line up with...

    Most AT style motherboards will line up with slots on the back of the case, the problem is the standoffs. You'll probably have to end up marking, drilling and tapping more mounting holes for large...
  22. Never use Ebay capacitors in stuff you care about...

    Never use Ebay capacitors in stuff you care about working long term.

    www.mouser.com and www.digikey.com are places to get quality components. Shipping is a bit steep, so it's good to have a big...
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    You got lucky. I've literally done motherboard...

    You got lucky. I've literally done motherboard swaps on dozens of these things, and there was a class action lawsuit covering the faulty GPU. The refurb boards are just as likely to fail since they...
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    The D620 and D630 had very high failure rates due...

    The D620 and D630 had very high failure rates due to the ROHS solder fiasco. The models with the Nvidia graphics chips had additional failures related to the GPU package itself, where the bond wires...
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    I'd recommend Piriform's Recuva:...

    I'd recommend Piriform's Recuva: https://www.ccleaner.com/recuva

    I've used it to recover all sorts of deleted stuff over the years, and It's pretty good. Its recovery rate depends on how much disk...
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