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Reparatiehandleidingen voor beeldschermen (of monitoren) van computers of andere apparaten met 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, some going up to ~50,000 volts (usually reserved for TVs or monsters like the GDM-FW900)! While this is the generally accepted rule, you should not assume this is going to be the case every time. Treat the monitor as if it is holding the higher voltage average between 15 and 25k at all times, especially as some “professional” CRTs like the FW900 (and FW900-derived rebadge monitors) are likely to exceed 15k volts due to the CRT size and go into the 20-25k range out of necessity for the giant 24" 16:10 CRT due to the sub-2K resolution tube.
IMPORTANT: Most modern CRTs (90s-final production) have a bleeder resistor, but this is often burned out and cannot be relied upon to work! You still need to discharge the tube to be safe -- DO NOT TAKE ANY CHANCES! Anything from the 80s is dicey, and 70s or older doesn’t (or it died decades ago).

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

That said if you still insist on trying and we can’t stop you, 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 - THIS CAN CREATE A HEART-STOPPING CIRCUIT WHICH CAN KILL YOU. In addition to that, if you wear any jewelry, it is imperative you take this off. This will become a hazard if you slip up as it is an excellent conductor. Remember: electricity takes the path of least resistance.

If you do not know where to get a real discharge tool (or have one) since they’re hard to come by these days, it’s okay to use a rubber-handled screwdriver with an alligator clip lead, but do not want to use the ones from Radio Shack or Fry's; they will burn up. Use car jumper wires if that’s all you have - it’s overkill, but when dealing with 15-25,000 volts you’re better off going overboard to be sure it will not bite YOU and potentially kill you.

Before removing the anode from the tube, ALWAYS TOUCH THE LEADS WITH A GROUNDED SCREWDRIVER FIRST! This ensures the monitor has no charge left. 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 zal eeuwig dankbaar zijn.

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