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Thread: after decades, it finally happened.

  1. #1
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    Default after decades, it finally happened.

    ... plugged in the XT/AT power connectors backwards (yeah yeah yeah. black wires from both connectors should be in the center.)
    I think it took out the motherboard and XT-IDE card (and I just finished building that thing!) grrrrh.

  2. #2
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    You know, I have done that more than a few times on all kinds of machines, XT through the end of the AT era, and I do not think I have ever fried something doing it. The thing that has killed more than a few boards for me is dropping those slot cover screws on the motherboard (yeah I finally learned not to install slot covers while the machine is on).

    IBM 5160 - 360k, 1.44Mb Floppies, NEC V20, 8087-3, 45MB MFM Hard Drive, Vega 7 Graphics, IBM 5154 Monitor running MS-DOS 5.00
    IBM PCJr Model 48360 640kb RAM, NEC V20,, jrIDE Side Cart, 360kb Floppy drives running MS-DOS 5.00
    Evergreen Am5x86-133 64Mb Ram, 8gb HDD, SB16 in a modified ATX case running IBM PC-DOS 7.10

  3. #3

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    I must have done this too but don't recall° The only motherboard I fried was due to me stupidly inserting an ST506 controller with the power on. I'm guessing that reversing those power connectors shouldn't harm the computer; it should just shut off the power supply. But I haven't exactly reviewed the pinouts lately.

    °I vividly recall some clone power supplies with the P8/P9 markings marked incorrectly, and seem to remember at least one motherboard with the connectors reversed.

  4. #4
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    I will proudly accept the designation of village idiot, but I have never plugged those cables in backwards. I am in the habit of leaving cases disassembled, covers off. I once dropped a floppy disk onto an exposed motherboard, and although it wasn't fried, it was wonky and I retired it. Then cried. It was a DEC 486 pizza box that I kind of liked.

  5. #5

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    I have also done this, and I recall that the power supply wouldn't turn on as if there was a short. It may vary between motherboards and power supplies.

  6. #6

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    Quote Originally Posted by norm8332 View Post
    I have also done this, and I recall that the power supply wouldn't turn on as if there was a short.
    It's designed that way.
    PM me if you're looking for 3½" or 5¼" floppy disks. EMail “ ” For everything else, Take Another Step

  7. #7

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    Don't worry pal, almost all of us have been there somehow or another.

    I had a Gateway Solo 3350 that I really liked (Very nice subnotebook with a 750MHz Pentium III and dedicated ATi Rage 3D 8MB Video, even had PCMCIA and a USB 1.1 port, absolute champ of a machine) and one time I dropped a screw into it while adjusting the display hinges to be stiffer. Of course it was plugged in. It took out the video chip and made it into a zombie of a computer. It will still boot and monitors will still sync to it, I can hear the Windows 2000 startup sound. But nothing will ever show on screen. It's terribly sad. I've considered using a heat gun and removing the video chip and vram and replacing it, since the rest of the machine seems unaffected, but that sounds like an awful lot of work for something of that age with no value... Oh well, I suppose.

    Don't feel too bad about it, especially since most (if not all) of those components are DIP and (probably) still easy to find replacements for! Some of those might even be socketed!

  8. #8

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    Quote Originally Posted by tipc View Post
    I will proudly accept the designation of village idiot, but I have never plugged those cables in backwards.
    I once connected the power cable to a 3.5" floppy drive offset by one pin. Did not expect the cable's isolation to burn up 50cm in under a second. The drive was fried, the system survived (luckily, since it wasn't mine).

  9. #9

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    Plugged a 486 in the wrong way.
    Dwight

  10. #10
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    Come to think of it I think I nearly did recently, but caught myself. The reason I believe I've never done this is because I looked atlater the traces on a motherboard long ago and figured it out for myself. It's sort of.etched in my memory.

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