I've heard the charge can last a very long time, sometimes many months. When I went to discharge mine, I didn't see any arcing, but I know it still may have been doing so. Certainly the CRT can hold a charge for days or weeks even. Best to be safe and discharge it always.
You can't predict on any particular set whether or not it will have a charged up picture tube. The leakage paths are not always obvious. Push the screwdriver tip under the edge of the rubber cup, you may see a spark. Then it would be discharged. If you are disposing the CRT it should have the vacuum pressure released.
To release the pressure there is a metal connector under the rubber cup. Once the CRT has been discharged, disconnect the connector under the rubber cup. You will see the little metal connector nub underneath. You can cut that with diagonal cutters and you will hear the vacuum hiss; that is air rushing in the CRT tube.
After that you can safely break the back of the CRT tube if that is your plan. I agree totally with the answers on here,As a television engineer i worked on crt's in the early years and believe me!
So i would advise you to leave it up to a professional. Don't Try it all. W O W guys I was about to try to disassemble an Apple CRT studio display and looking for an "how to" guide but was totally not aware of these risks I wanted to make an aquarium from the casing but will think twice now You wear a "flack jacket" when you get an x-ray at the dentist for a reason.
Also, many laws prevent businesses or offer incentives for not dumping broken CRT monitors because the lead leaks into the environment and causes alot of damage. The truth is far less dramatic than this guy Wait till you get a mere on high amps and see how that feels, not easy to let go of the offending item either and guaranteed hilarity for your co-workers! Then you get up, brush yourself off and get back to work before the gaffer reaches you to see why productions stopped ;-.
Whip it out and nip the bud off the end to release the vacuum. I did this for my retrofit Amstrad PCW to make the new screen look insconspicuous and was a 5 minute job from start to finish. That is an answer that could get someone killed - yes, killed. I have been working with CRTs for over 50 years we used to call them picture tubes. When a CRT implodes shards of glass can fly over 30 feet. I have seen it. Others in the room could be injured as well. The ultor second anode voltage is nothing to sneeze at either.
And yes, I have gotten shocks from volts one leg of 3-phase to ground no fewer than three times. Your first could be your last. Understand that. Respect that. Virtually every day I work with machines that need lethal voltages to do their jobs properly. I am not afraid of them but I am always respectful of the injury or death they are capable of.
Be respectful of the voltages it carries and the fact that any high voltage item - even if it is only a few milliamps - can injure you. Working with this safely requires one word - respect! The 1 safety device is the six inches or so between your ears. Never forget that. There is one thing you should always remember when working with potentially harmful voltages - and remember people have been fatally electrocuted on as little as 24 volts.
The important thing to remember is that your heart runs on a string of electrical impulses. If you get an electrical flow across your heart, such as one hand being on a voltage source and the other on ground, this voltage across your heart, which is much stronger and completely wrong for what your heart needs, can make your heart stop and start contracting in the wrong ways.
Death or permanent and irreversible brain damage can occur in minutes. Most professionals work in a way that they cannot get a hand-to-hand shock. Keeping one hand in your pocket is a good start. As far as discharging a second anode, I have always used a flat blade screwdriver and a jumper wire clip, Nothing elaborate.
But it is also important to know where to discharge it to. Usually the chassis, but possibly somewhere else. There should be a label saying where to discharge it. In a glass CRT, there is a coating on the inside and the outside of the glass called aquadag. The coating on the inside is silvery, the coating on the outside is black. The black is grounded and the silvery coating is connected to the high voltage button on the inside.
These are both conductive surfaces, the glass between them is a dielectric insulator and therefore it forms a capacitor, and this is what holds a charge. If you are disposing of the CRT, it is best to let the vacuum escape. Unplug this, and in the middle of the pin circle there is a glass tube that appears melted, which is called an exhaust tip.
Break this tip off with a pair of pliers and you will hear the air rushing in. Once that stops the crt is as safe as any other piece of glassware that size.
Learn more If you need to make internal adjustments to a CRT monitor, it's safe to discharge it first. A CRT monitor has a high-voltage anode inside it, which can carry a charge of up to 25, volts. If you don't discharge the monitor and if you do, but improperly, you can get electrocuted.
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By using our site, you agree to our cookie policy. Cookie Settings. Learn why people trust wikiHow. Download Article Explore this Article Steps. Tips and Warnings. Things You'll Need. Related Articles. Author Info Last Updated: May 7, Leave it alone for a few hours. Home Help Search Login Register. Send this topic Print. Read times. I was just wondering how long does a CRT hold its' charge?
I have looked at the steps required to discharge the CRT and it's got me a little scared The last time this CRT got any power was about 1 week ago It has been unplugged since then. Is there still a charge in the CRT and if so, could it still be as high as they say ie.
I'm just nervous about even discharging it. Any help is greatly appreciated. ChadTower Chief Kicker - Nobody's perfect, including me. Fantastic body.
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