How long does crt hold charge

From a Electronics book put out by the Navy in the navy, you can sail the seven seas Ensure that you have adaquate illumination. You must be able to see clearly, if you are to safely and properly perform the job. Where practical, use only one hand, keeping the other either behind you or in your pocket.

If the system voltage exceeds volts, rubber gloves should be worn. An assistant should be stationed near the main switch or circuit breaker, so that the circuit may be immediately deenergized in the case of an emergency. A man qualified in first aid for electrical shock should be standing by during the entire operation. DO NOT work on any type of electrical apparatus when wearing wet clothing, or if the hands are wet. DO NOT wear loose or flapping clothing. The use of thin-soled shoes or shoes with metal plates or hob-nails is prohibited.

Flammible articles, such as celluloid cap visors, should not be worn. All rings, wristwatches, bracelets and similiar metal items should be removed before working on equipment. Also ensure that clothing does not contain exposed metal fasteners such as zippers, snaps, buttons and pins. Do not tamper with interlock switches, that is do not defeat their purpose by shorting them or blocking them open.

Ensure that equipment is properly grounded before energizing. Deenergize equipment before attaching alligator clips to anything. Use only approved meters and other indicating devices to check for the presence of voltage. Observe the following when measuring voltages in excess of volts Therefore, capacitors should be discharged individually, using an approved type shorting probe. Then hold the safety shorting probe by the insulated handle and touch the rod to the point to be shorted out Always take care not to touch any of the metal parts of the safety shorting probe while touching the probe to the 'hot' terminal.

It pays to be safe; use the safety shorting probe with care. At least. Personally, I would not expect them to ever totally discharge. That's why I use a HV discharge stick. And why, after I've gone over all of the discharge points, I go over them all again. I've lost two screwdrivers and one gold ring to such accidental electrical discharges, and don't need any more finger scars, thank you very much. I mean I wouldnt joke about some of this stuff here considering of some newbie reads it and goes OK..

When discharging attach the "probe" to a correct ground and see where that big ass red wire plugs into the monitor stick that probe in there and wigle it around. That should discharge it.

Keep one hand behind your back when doing this. Make sure that your work space is cleared out and that somebody is watching you to make sure that you dont fuck up. Live adjustments.. If you dont know what you are doing, take it into a shop. The extra cash may be worth saving your ass. Be careful man. A monitors holds enough energy in it to kill a small Army pun intended. Anyway, if I were you and wanted to keep my life I would throw it out, or send it to a proper disposal palce to have them destroy the CRT properly.

I'd imagine that it would be a relatively safe procedure to discharge even the biggest cap to ground, so long as it's done through some form of resistance that can handle the necessary power. Think about it - you know how big a voltage your cap has when it's fully charged, and you should be able to figure out how much charge is stored.

You pick a discharge current that you know is safe and won't stress anything too much, and from that, you pick a resistor that'll give you the current you're looking for. You then attach your discharging doohickey, and keep well away until the time you calculated has passed. You still have to be careful as hell when you're attaching up your discharging wotsit - there's no way you can get around that.

You also have to make sure you do your sums right. But yeah, those big caps scare me - I did a short intro to power electronics and stuff when I was at Uni. I was never that interested and never went any further than that one course, but some of the numbers they talked about scared the hell outa me. If you don't know what you're messing with, it's probably safer to junk it and buy a new one, or pay a Pro to take the risks.

Edit: Hehe Well, I took the shroud off. Beyond that, I just stand in the corner and stare at it sitting on my workdesk. There's a lot of misdirected concern being expressed in this thread. Being careful means looking beyond the obvious. Those "big caps" hold all of about VDC. It's a lot of energy, but since it's DC it's not necessarily deadly. It comes from the flyback transformer directly into the anode of the picture tube. Now, what none of you seem to realize is the picture tube IS a giant capacitor.

Fantastic body. Can be quite a while If you're ever in doubt do the discharge. If you're too nervous to do the discharge don't try the swap.

Quote from: northerngames on September 10, , pm. A few things regarding the "discharge" - first off the charge on the tube is " static" this means one shot.. Biggest danger is dropping the tube because of the shocking surprise. It may actualy recharge after being discharged. Yes Discharge every time you handle the tube I don't but after years of getting hit I am used to it. Always happy to help..

Quote from: Rickn on September 10, , pm. Yeah my buddy unloaded a monitor on himself a couple months ago. Not knowing anything, he wanted to see what was under the suction cup thingy.

Didn't hurt him, but scared the crap out of him. Well, I know a recently charged older 25'er will make you do something to the effect of "unnnghghgh" and will sit you down for a bit to regain some form of mental state that is measurable. Reassure them. Helpful 0 Not Helpful 0. If you are jittery about electricity, do not carry out this procedure. You are more likely to make a mistake if you are nervous. Take it to a professional. Minor amounts of static electricity may continue to collect after the discharge: if you are not servicing this circuit immediately you must repeat the discharge procedure before working on the circuit.

Also, briefly discharge or short especially the large capacitors to avoid similar shock surprises. Submit a Tip All tip submissions are carefully reviewed before being published.

You don't want to be grounded. Make sure that, during the entire procedure, you are not accidentally allowing yourself to be grounded. Helpful 8 Not Helpful 1. Helpful 7 Not Helpful 1. If you mess up, you could be shocked, or even electrocuted. Ask for professional assistance. Helpful 5 Not Helpful 3.

Related wikiHows How to. How to. Myers, Michael and Jernigan, Scott. Co-authors: Updated: May 7, Categories: Computer Monitors Computer Maintenance. Thanks to all authors for creating a page that has been read 98, times. Is this article up to date? Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. About This Article. By signing up you are agreeing to receive emails according to our privacy policy.