Display issues on SE and SE/30 after recapping

[burstattack]

Hi folks,

I have an SE and SE/30 that were working, though with their original capacitors. The SE/30's video started to deteriorate -- after startup, where video looked normal, "snow" would start and gradually get thicker until the screen was unreadable. The rest of the machine worked fine except for sound, even though the speaker was confirmed working. The SE worked as normal without any issues.

I had both boards recapped yesterday with capaciators from Console5 (tantalums for the SE/30 and electrolytics for the SE). Once I got them home and plugged in, I found that the SE/30's sound was back (I was so pleased to hear the startup chime!), but now there were severe video issues in both machines. I didn't find similar symptoms in my cursory search of the forum, but I did find this post over at iFixit with the same issue as the SE/30.

I've attached screenshots of both machines at startup with no disk attached or inserted.
The first screen shows the SE. You can see the floppy icon appears normal in front of all that garbage, but if I let it continue booting, the Welcome to Macintosh screen is messed up and unreadable.
The second screen shows the SE/30. You can kind of see where the floppy icon is; if I let it continue starting up from a floppy, it appears to work normally except fro the video.

I have had no work done to the analog board at all, whether earlier or when the boards were getting recapped. And I'm no expert - I have to depend on others to do the soldering and whatnot. However, I do have a multimeter!

If anyone can give any advice, I'd appreciate it.

 

[bibilit]

Concerning the SE/30, probably UE8 (LS166) faulty.

The SE… can’t help, can you post pictures ?

 

[imactheknife]

As with most vintage macs and a lot of pc’s etc recapping is only part of the restoration process. You might also need to remove other components to clean leaked cap juice. This also means to clean pads and legs and check for broken traces and rotten vias. It can be quite a process.

Fortunately for you your units are known working so might be fairly easy to get them back that way with a little investigation. Ue8 definitely a place to look. Would soak board in isopropyl and lightly scrub with soft toothbrush around areas where caps were. How bad was the leakage? Did you have any issues removing old caps?

 

[bibilit]

The strange thing is that your SE was working before the new caps… and the SE is not known for having capacitors issues, had a few and most worked with original caps. A broken pad somewhere ??