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: https://everymac.com/monitors/apple/stud...
Any idea where to find it?!
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 every time. Treat the monitor as if it is holding the higher voltage at all times, especially as some “professional” CRTs like the FW900 (and FW900 derived monitors which were rebadged) are likely to exceed 15k volts due to the CRT size and go into the 20-25k range out of necessity for the giant CRT (24” 16:10, in the case of the FW900).
IMPORTANT: Most modern CRT’s (90’s-final production) have a bleeder resistor, but this is often burned out and cannot be relied upon! As such, do a discharge to be safe! DO NOT TAKE ANY CHANCES! Anything from the 80s is dicey, and 70s or older doesn’t, or if it’s there she’s dead.
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 that 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 you do not want to use the ones from Radio Shack or Fry's. These are not thick enough to handle the sustained CRT discharge load and will burn up. 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 since it can literally be life of death.
Before removing the anode, 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.
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
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 ;-)