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I have a Macintosh SE with a vertical line :(

I just got this old Mac SE and it worked before I took the case off to dust the inside. Now I have a vertical line. Anyone know how to fix this?

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The capacitors on the analog board are usually the culprit when this happens, but it can also sometimes be the flyback. While you can repair this, you do need to study how to handle a CRT safely so you do not injure or kill yourself. See here for general advice I have given in the past on the matter: Disassembling an old Apple monitor; it's not something I recommend to beginners, but the lesser evil is leaving you guys without the information on how to do this right. The main rule is DO NOT TRUST ANY BLEEDER RESISTORS. It may work, but they burn out after a few years of being abused to quickly discharge 15-25k volts. The manufacturers knew this back then too; it was only expected to work for a few years and that was usually it. The odds of one from the 80s having any semblance of function left are just about zero at this point. While I have updated that answer (as I do every few years) as I use as a general starting point to give to beginners, it's been passed around a few times; that doesn't mean it isn't still valid. At this point our best advice on CRT safety lives here, as well as this (newly created) Wiki: Safely discharging CRT monitors

This one isn't as bad being a ~15k tube (small color tubes tend to hover ~25k) but that's still enough to give you a nasty kick that will knock you on the ground. The capacitor list can be found here.

This is a time failure, not user failure 9 times out of 10. Even then it's a thing that anyone who knows better gets out of the way when they get a computer with one of these "at risk" analog boards if it hasn't been redone. I can redo it and not have to worry about it... OR wait until I lose the computer until I can repair it. Which one sounds better?

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@tonyezzo that is a collapse of the horizontal deflection circuit. this could simply be caused by bad solder joints, as well as failed components like capacitors and even the IC's on your SE.

Before working on it, you do want to read and fully understand the Apple specific safety guide ESD Safety Guide. To work on it, use this document Macintosh SE Service Source.

Here are the Macintosh SE Schematics. Now, this is for educational purpose only. Remember, as was said before, these monitors pack a punch. Follow proper CRT safety procedures to avoid personal injury etc. while working on High Voltage circuits.

While you work on your classic computer, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. The iFixit community will appreciate this.


Repair is War on Entropy!

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I think it may be time to see if we can get the information we have on CRT discharging out of Answers to a Wiki that isn't hard to find; I have had to dig for that one a few times. The problem is it has our best info, so while it's hard to find it's worth it for questions like this since it saves me from rewriting the "mini book" on this.

It might take me a bit, so I'll get back to this when I have it, then we have a link we can all use when these CRT questions come up.


@oldturkey03 That's what I'm thinking. Take that, but text form it BUT ALSO link something like that to it for visual assistance.


@nick just write a quick Wiki and use those images.


@oldturkey03 Done. Took the info from the 2018 answer, linked the guide, posted the Apple safety information.

At this point I wrote it because I need something I do not need to dig for when these cases come up.


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Thanks for all these answers. I don’t know if personally I would be able to fix this. I am more of a home repair man instead of a computer repair person unless someone wants to point to let me know which capacitors need to be replaced and what board and I would definitely take a dive at this. I already watched videos on how to discharge the CRT safely.

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Tony Ezzo sarà eternamente grato.
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