Repair guides for displays (or monitors) for computers or other devices with video output.

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Disassembling an old Apple monitor

Hi to everybody, I'm desperately looking for any disassembling instructions for an old Macintosh Studio Display Monitor, this one:

Any idea where to find it?!

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CRT monitors can hold up to ~15-25,000 volts (25,000 volts is usually reserved for TVs). While this is the generally accepted rule, you should not assume this is going to be the case; treat the monitor as if it is holding the higher voltage at all times. Most modern CRT’s (90’s and newer) have a bleeder resistor, but this is often burned out at this point due to years of stress. For this reason, you must discharge the CRT as a safety precaution to be sure.

Unless you know what you’re doing, you are better off leaving the repair to someone who knows what they are doing or replace it. These monitors hold enough charge to kill you if you screw up.

If you still insist on trying, you need to take precautions. The best advice I can give you that isn’t covered is to ALWAYS keep one hand behind your back - this will prevent a circuit from forming if the charge chooses your hand as the path of least resistance. DO NOT have both hands out at the same time, as this can create a complete circuit that can kill you.

If you wear any jewelry, it is imperative you take this off. This will become a hazard if you slip up, even if you take other precautions. Jewlrey provides little to no resistance.

If you do not know where to get a real discharge tool, it’s okay to use a rubber handled screwdriver with an alligator clip lead, but you do not want to use the ones from Radio Shack, just to name an example. These are not thick enough to handle the sustained load discharging the CRT will put in the wire and will cause a fire. Use car jumper wires if that’s all you have - it’s overkill but when you are dealing with 15-25,000 volts you’re better off going overboard.

Before messing with the board, ALWAYS TOUCH THE LEADS WITH A SCREWDRIVER BEFORE REMOVING THE FLYBACK ANODE to ensure it is discharged. Again, failure to do this CAN KILL YOU.

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I have to agree with @nick. We want to encourage repair, but when it has potential to harm, it’s best to take it to a professional.


I've opened CRT's before, but they still scare me a little. I would still do it on a monitor worth saving like a Trinitron, but I'm not going to work on an eMachines CRT.


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fuino_alex  I agree wholeheartedly with my colleagues about the danger when dealing with CRT’s ( can be a shocking, heart stopping experience)Since I am sure that you are going to find some information about this task somewhere else anyway, I think it might be safer if you can get it on here. I do think you should at least receive a couple of ideas. Something like the CRT safety is vital when you work on monitors like yours. CRT safety

This will show you how to disassemble it safely. APPLE-Studio_Display_17.pdf

Again, follow all the instructions to a T. This stuff can kill

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I've since added my own additional advice to my answer after it got moved to Answers. I didn't think it would happen, so I didn't give it too much thought.

As I told @blakeklein the only way I will open one is if it's a Trinitron or a rebrand like some of the older Dell CRT's that aren't the freebie generic ones they handed out like candy in the 2000's. That includes KDS/eMachines monitors.

I'm not going to risk my life to open a cheap and plentiful CRT.


I open those a lot. Can't repair vintage console games or Vectrex without doing so. All of those are CRT based. To be safe, one must follow the proper procedures.


I know the retrofit Composite monitors usually don't have the bleeder resistor. It's only really found on 90's-present monitors and many classic Macs.

That said you still need to treat any CRT as if it's charged even with the resistor.


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I just use a CRT discharging tool to eliminate the hazard. cheap! I would have been out of business if I let fear dictate what I could work on. After all, most of the early Macs all had CRTs! But I remember a couple of times when my tech got knocked on his tukus when he didn’t discharge it. But after the second time, he remembered to discharge them ;-)

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fuino_alex sarà eternamente grato.
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