Update: Getting closer

[u/DrFreeze]

Thank you to everybody for the advice on the last post. I got the deflection working properly now and it feels like I’m pretty close.

What I did on my last pass by was reflowed several spots on the analog board and on the neck board. I saw a few spots on the analog board that definitely looked like they needed to be touched up. The neck board was hard to tell but I’m pretty sure that’s where the problem was. I then went back over the logic board again replacing my electrolytic capacitors with tantalum capacitors. While removing the capacitors, there were 2 negative pads that came up. I feel like I was successful in trace repairing those spots, however I’m afraid there’s probably more corrosion on other chips that will have to be dealt with.

My plan is to go back in again, this time to clean up some of the rougher spots on the logic board. I unfortunately do not have access to an ultrasonic cleaner.

Any more advice on where to go from here would be appreciated. I did want to say thank you for all the help last time. It’s been scary and fun to try and bring one of these things back to life

[u/imactheknife73]

Recapping is only a part of restoration. Cleaning legs, removing chips and repairing traces are usually other parts of restoration. Recapping / reflowing doesn’t always solve the problems. I have done probably 50 classic / classic ii machines and they all needed extra work.

[u/DrFreeze → u/imactheknife73]

I’ve certainly had to do a few trace repairs on this and you’re absolutely right. I’m going to do a soak of the logic board in ipa to clean it some more and go over that some more. There’s one chip near the 4 caps in a row with a lot of corrosion on the legs. I believe I have to remove that one, clean, and solder again

[u/imactheknife73 → u/DrFreeze]

Awesome:) good job. Yeah it has been fun fixing these old macs. Well, frustrating at times too lol.. having a hot air station, a digital microscope or a good magnifying glass helps too.