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mattsoft

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  • Gender
    Male
  • Location
    Seattle
  • Interests
    Retro computing and video games

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  1. mattsoft

    Macintosh SE with horizontal lines, no chime

    So I found a working SE and swapped main boards. The broken SE (now affectionately known as old stripey) works fine with the working main board. So the horizontal stripes is something on old stripey's main board. I swapped the ROMs and still no luck. So it must be some other component on the main board that has given up the ghost.
  2. mattsoft

    Macintosh SE FDHD, Hard Drive Migration?

    I would get a SCSI2SD, prep it with an SD card of appropriate size and connect it to the external SCSI port. Format the "drive" and copy everything over. Remove the spinning HDD and mount the SCSI2SD inside.
  3. mattsoft

    Macintosh SE with horizontal lines, no chime

    Well, I figured out why I was getting a black screen when only 2 SIMMs were installed. My SE logic board has the 150 ohm resistors at R35 and R36. On my board, R35 was cut and R36 was removed. I soldered 150 ohm resistor on R36 and put 2 SIMMs into slots 1 and 2 and instead of a black screen, I get the same damn horizontal lines. I swapped all 4 sticks of RAM around in those 2 slots and always got the horizontal lines. So either I have 4 bad SIMMs or it's something else. I removed all 3 ROM chips, cleaned the pins and sockets and re-inserted. No change. I also tested the voltages on the power molex into the motherboard. Everything looks good. Checked all the pins on the bottom of the logic board and nothing appears to be bent or shorting anything. At this point, I'm stumped. If someone has a working SE motherboard they'd like to sell cheap, I'm all ears! Thanks!
  4. mattsoft

    Macintosh SE with horizontal lines, no chime

    I cleaned the SIMMs and sockets. This SE has 4MB of RAM (4 X 1MB SIMMs). With the 4 SIMMs installed, I get the horizontal lines. I removed the 2 SIMMs from slots 3 and 4 so it only has 2MB of RAM and I get a black screen. Swapping the 4 SIMMs around so that only the 1st 2 slots are filled always gives a black screen. If I put 2 SIMMs into slots 1 and 3, I get vertical lines. This config shouldn't work, so I guess that makes sense. Maybe I have 3 or more bad SIMMs. What I need is a working SE to start swapping parts. Will keep a lookout for one in the area. Thanks!
  5. I had a similar problem on a Plus and it was a cold solder joint on the analog board where the power molex connects. I simply reflowed the solder on the analog board for the molex connector and all was good. YMMV.
  6. I have an SE that when powered on does not make a chime and displays these lovely horizontal lines. Initial inspection of the motherboard looks good. Anyone familiar with these symptoms? Gonna check voltages next. Thanks!
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