Damage inside Macintosh Plus

[sega dude]

The inside of my Macintosh Plus looks bad. It's all rusted and it looks like part of the back case melted or something. It's amazing that it worked at all. The caps on the analog board look ok, none of them seem to be bulging. See the pics below.





Is that glue? Or are those caps leaking really bad?









What happened to the back inside case? Did it melt? Is this common?

Now that I got it opened, where exactly do I look for cracked solder joints?

 

[MacDougall]

The goop at the bottom of the caps is just glue. The back of the case looks like maybe the battery has been eating it. It looks like it has gone all the way down to the logic board, so you should to inspect/clean that area by the round I/O connectors to make sure it hasn't been corroding the circuit board too.

 

[CC_333]

Yeah, I agree with MacDougall. Inside the case, it looks like the EMI paint is bubbling up and peeling, possibly due to battery acid (However, I don't see any damage on the logic board battery holder; perhaps it was replaced?)

c

 

[sega dude]

There was no battery in it when I got it. The bottom contact of the battery holder was eaten away. Is the rust a concern? Besides the obvious lead solder, is there anything hazardous inside I should be concerned about?

 

[James1095]

Not particularly, just watch out for high voltage. Even the lead solder isn't a big deal, just wash your hands after handling it.

 

[sega dude]

How do I remove the paper cover on the analog board in order to access the solder joints? It seems to be held on by adhesive foam pieces.

 

[Bunsen]

Please post images as local uploads wherever possible.

 

[James1095]

How do I remove the paper cover on the analog board in order to access the solder joints? It seems to be held on by adhesive foam pieces.

It's just double sided foam tape. Gently tear it off, usually it will split the foam and you can glue it back together with a dab of superglue. Alternately you can scrape off the remnants and use new foam tape, 3M makes the stuff, you can buy rolls of it in any decent hardware store or home center.

 

[mcdermd]

Most office supply stores also sell them as "mounting squares" in varying thicknesses.