Macintosh Classic Partial Screen Collapse?

[jmb2011]

Hello,

A while back I partially recapped the analog board of my Macintosh Classic. I got the typical suspects replaced. I remember it working fine, but when I turned it on today, the screen is smaller at the top and bigger at the bottom.

If you wait for the computer to warm up, it eventually fills out 95% of the way, with the top still not looking perfect.

Any ideas of what could be the issue? Is it still a capacitor issue? Any help would be appreciated!

 

[robin-fo]

I‘d assume either bad solder joints or remaining capacitor juice

 

[jmb2011]

I‘d assume either bad solder joints or remaining capacitor juice

I’ve reflowed the main solder joints where the analog board connects to the crt yoke and the logic board. I did clean up residue with a qtip and isopropyl alcohol when recapping. Should I have been more aggressive with cleaning it?

 

[jmb2011]

Just wanted to update this thread in case anybody else comes across this issue. I bought a recap kit and went ahead and replaced all the capacitors on the analog board (I had only done a partial recap previously). There was some of the capacitors that I did not replace the first go around that did have some electrolytic gunk underneath the caps. After cleaning the board thoroughly and replacing with all new capacitors, I finally got the issue resolved.

 

[Byrd]

Looking good! I've a similar Mac Classic II and need to get back into it for another deep clean the cap goo was like honey.

 

[cheesestraws]

Good stuff! The Classic and Classic II ABs were built extremely on the cheap, and it shows.