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    First Macintosh Classic II trying to fix

    Fixed! I dumped the 4 ROMs and with a friend, I discovered that the 4 roms were swapped (U23 was wisplaced in U25).... The previous owner must have to swap or someone for him!!! That was incredible!
  2. H

    First Macintosh Classic II trying to fix

    Yeah i've desoldered U4 too. There is some troubleshooting manual to check signals, etc...? I really would like to make as many test as possible.
  3. H

    First Macintosh Classic II trying to fix

    Thanks for your suggestion! Today i removed 15 ICs, please check photos in the link. I cleaned the area of these ICs:  U20, U21, U13, U14, U17, U18, U6, U7, U4, U4, U3, U2, U1, U15, U12 and U10 https://imgur.com/a/Vg4lJhH and seems like there is a bit of life: https://imgur.com/a/eqczefH In...
  4. H

    First Macintosh Classic II trying to fix

    Yes i have hot air station and I've desolder other SMD ICs. Could I check if is shorted in some way before desoldering? I can't find any pinout
  5. H

    First Macintosh Classic II trying to fix

    Ok, so only capacitors on top part of the board. I checked the RAM continuity and all seems good. Could be something relate to analog board ?
  6. H

    First Macintosh Classic II trying to fix

    Yes I tried that! Tried that too! The board is cleaned, i think there is nothing under RAMs. edit1: I didn't recapped the caps on the bottom side of the board... there are some tantalium cap and others squared, please check the photos!
  7. H

    First Macintosh Classic II trying to fix

    There are some tests I could make to be 100% sure? I really would like to fix this!
  8. H

    First Macintosh Classic II trying to fix

    Hi guys, last days i got for free a Macintosh Classic II that need restoration and fixing. I uploaded some pictures on imgur and as you can see the issue is the classic vertical bars. I read online that for similar issue need recapping. I cleaned the board with distilled water and some soap and...
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