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Macintosh SE/30 Fixing Motherboard Faults

Macintosh SE/30 Fixing Motherboard Faults.

I spent many months (eight) to repair some of these macintosh SE/30 motherboard, like you can see in the gallery.

The flaws that i could find and repair are:

  • Some multiplexers (74F253 or like) burned.
  • Some Video Ram burned.
  • Very Dirty Motherboard.
  • Electrolytic capacitors have to be replaced.
  • Reseat the RAM and ROM SIMM.
  • Some track of the PCB broken or corroded by the acid.
  • Replaced the lithium battery with a new one.
  • Cold solder joint on chip: RP4/RP5/RP6 – UI2/UI3/UI4 – UJ2/UJ3/UJ4

The flaw that you see in the first picture and that should be the “Jail Bar Pattern” or “Smile Mac in Jail”, in this case is not been so. For this reason i spent a long time to find the fault.

However, i recovered 3 motherboards and I consider myself quite satisfied.

source: Repair Macintosh SE/30 68kmla.org #1 68kmla.org #2

  1. Romeo
    September 6th, 2012 at 12:15 | #1

    Hello,
    i would like to repair a SE30, and the first problem is that: I have the chip 341-650-A AMI 9005 MBP with two broken pins :(:(
    Do you think I can find the part to replace it ?
    Thank you very much!
    R.

  2. Lantz Newberry
    May 31st, 2015 at 00:00 | #2

    Hello I own a working Mac SE/30 which was in storage for a couple years. I just pulled it out and booted up and it’s making working noises but there’s no start up chime and the screen stays black except for every once in a while there’s flashes of light like a birthday I’m starting the middle with streaks horizontal. It’s always worked perfectly so I went online and saw some articles about corroding capacitors and then found your article. Have you ever just clean the motherboard and have it work? Or have you always had to fix the capacitors and other components?

  3. Lantz Newberry
    May 31st, 2015 at 00:02 | #3

    This was the article about the corroded capacitors
    http://pc-restorer.com/repairing-a-macintosh-se30-with-no-sound/

  4. Lantz Newberry
    May 31st, 2015 at 00:04 | #4

    Lantz Newberry :
    Hello I own a working Mac SE/30 which was in storage for a couple years. I just pulled it out and booted up and it’s making working noises but there’s no start up chime and the screen stays black except for every once in a while there’s flashes of light like a bursting star in the middle with horizontal streaks. It’s always worked perfectly so I went online and saw some articles about corroding capacitors and then found your article. Have you ever just clean the motherboard and have it work? Or have you always had to fix the capacitors and other components?

  5. June 1st, 2015 at 11:14 | #5

    @Lantz Newberry

    You must thoroughly clean the motherboard and replace all electrolytic capacitors.

    Best regards.

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