Discharging a CRT arcade monitor

[BLO383]

What abou these electrical safety gloves would they be safe for discharging?

Class 3 26,000 volts Working Voltage Insulated Electrical Safety Gloves?

Somebody please tell me before i kill myself i dont want to die doing this with a screw driver.

[JHONN77]

jajajajajaja

[1marcelfilms]

When i was 12 i though if you remove that, it will inplode 0.o

[funkyironman69]

DO NOT DO THIS!!! Leave it to a professional, these things can arc across air to you.

[AreYouLuckyWoW]

@funkyironman69 He discharged very well. Many many many arcade collectors do it this way and none have problems. Anyone can do this. I am going to do my first discharge this month and I have been watching videos on how to do it. Many experts recommend this way. It is cheap and it works. If I were to leave it to a professional it would cost too much. Go ahead and waste your money but I am going to spend $12 and do it myself in a safe way.

[larewwedxhhh19]

@AreYouLuckyWoW It seems we are in a similar position. While you may have already discharged it, I need to discharge mine. It's been siting for a good half year but I want to be very safe about it.

[AreYouLuckyWoW]

@larewwedxhhh19 I am ordering a safeback discharger from Bob roberts to discharge my monitor. I am also ordering a cap kit to help the picture look better

[larewwedxhhh19]

@AreYouLuckyWoW I have already discharged mine, and luckily it had nothing in it.

[NOLIMIT69NOLIMIT2000]

Those gloves are sexy.

[MrTpengineer]

The metal band around the tube minimizes static, it's part of the ground too. In case you didn't know :)

[kallisti05]

It seems to me "completely isolating" the monitor then reaching very near the frame with thin gloves, then grounding the flyback transformer to the frame is a bad idea... you are still the closest reference to ground. If you grounded the monitor frame then did it things would be a *lot* safer.

[arcademuffinz]

I've Been Working On Them Since I Was 8

[arcademuffinz]

Not To Be Rude, But........I Don't Think Your Educated With Doing This Other Than Watching Videos

[gobagobax2]

i been doing this sense i was like 13 never used gloves just a screw driver and wire never got shocked took apart thousands of monitors another thing i do is after i drain the crt id turn it over and short all the caps with the screw driver to make sure they are drained its really not as dangerous or as hard as it looks or seems even if you did get shocked itd just be a shock its not constant sense its not plugged in been shocked many times by camera caps those hurt !

[hardstyle905]

What the dude in this video is doing is not discharging. He's grounding the flyback transformer, which doesn't have a charge. The capacitors and the CRT can hold a charge.

[hardstyle905]

@21hammadmossop As to what high voltage looks like, check out my video "raped flyback transformer"

[toadsEATbugs]

@bobthebastard3 The rubber gloves help a tiny bit; they do stop maybe 10,000 volts. It's like getting shot with a .22 pistol while being protected by drywall.

[rollercoastermaniac2]

does it work after its discharged?

[mrcrtking]

Meant to say the CRT is actually a sort of basic Capacitor it will store electrical charge and can hold it for weeks, if lopty is a decent type and does leak have high vlaue discharge resistor, Aquadag froms one plate, glass forms dielectric and inner anode forms second plate, a simple capacitor, shorting the EHT to GND / chassis will not make chassis a hazard but simply short a possible stored 6kv out, the aquadag is also generally grounded to chassis / metalwork.

[mrcrtking]

I repair TVs for a living and have done for 17 years, once lit a cigarett off the arc from EHT cap to Aquadag wedged a screwdriver under cap and got it into positon to get inch long arc then turned on TV hay presto a 25 KV arc lit my cigarett on it, have it on VHS will upload soon, the TV used was a real old school wood cabinet philips from the late 1970s as they never shut down like the newer type do, once we broke the neck off, squirted in switch cleaner then turned on, Boom Galss everywhere.

[markblox]

i hate doing that scares me to death even after 12 years as a arcade tech

[BlackMetalWarewolf]

not to sound awqward, but doesnt transferring the charge to the metal frame now make the metal frame a hazard? or is it grounded?

[over2seeyer]

u'r gloves are useless when u work with kvolts

[weeardguy]

@21hammadmossop: uhm.. you can read what it does and what it looks like on the same comment-paga as this one ;)

[sonofsam717]

What is that "extra little thing"?

[dwarfer777]

static charges reach about 1cm per 1k volts, I believe a CRT monitor has about 15k volts, meaning the spark can jump 15cm...

wow is that right?

[pikachuthesquirtle]

plug it into a grounded wall socket, not the tv stupid.

[roblee3579]

wouldn't it be wise to use a resistor to slowly discharge instead of all at once?

[weeardguy]

@roblee3579 Yes: it is wise to use a good (or a few in series) resistor to prevent damage to micro-controllers and other sensitive stuff when a tube should discharge: I have no idea what is in an arcade monitor and what's not, so it could be nonsens in this case. The only that isn't nonsense is to connect the other end of the discharge wire to the proper ground of the tube, and not 'as long as it touches metal you're good'

[kevykev38]

I'm confused.... As far as i know the "Flyback does not hold the charge The CRT does. The CRT in a sense is like a big Capacitor. Am i wrong?. The crt holds the charge.

[weeardguy]

@kevykev38 Nope, you're right.

[JED1DJ]

@kevykev38 You are right. This is a bad demo of discharging a tube. The anode lead coming from the flyback does not hold a charge, the tube does. Some newer monitors have a bleeder circuit which drains the tube when it is powered off. It is a good idea to discharge a tube again before you attach the anode lead. A charge can be present even after 30 days. It is also good to use an inline resistor on your discharge tool. Use a 1 or 2 watt resistor at 100 ohms would be good.

[SuperSmasher97]

is the crt broken after you remover the rubber thing there?

[weeardguy]

@SuperSmasher97 Nope: there's a connection inside of it that makes contact with 2 kind of 'prongs' on the rubber 'suction cup'

[MarcosKiss2009]

Awesome explanation, help me very very much!

Thank's a lot for your time!

Best Regards,

Kiss

[SuperDan1348]

I'm taking a hardware test for Apple Technician Training, and this really helps me for the section on discharging a CRT.

Thanks!

[peugteobike]

A monitor tube can hold a charge of up to 10,000 volts

[zeldajunkielol2]

I'm making a arcade machine using a crt dell triniton computer monitor and I took off the plastic casing and saw that the inside is metal shielded. My question is, Is it safe to use the monitor in the cabinet without the plastic case?

[slaterking1000]

What happens if you turn on the monitor with out that connected?

[peugteobike]

It will arc

[slaterking1000]

@peugteobike will there be a display?

[weeardguy]

@slaterking1000 You won't get a picture on the screen: the 'suction cup' connected to the flyback creates the acceleration for the electrons in the tube: without that high voltage, electrons won't be speeding up, and the screen won't light: there is a possibility that ozon will form at that 'suction cup' due to the high voltage: if you're the nearest object in the vincinity (let's say a centimeter or 5) it will shock you with a painfull arc.

[bschonec]

Nice jammies.

[redSKORPION50]

Yep, spot on. High enough voltage and electricity will travel through anything.

[mig189189189]

Awesome video. Keep on with that good work!

[yellowdart137]

the rubber gloves are almost useless. cleaning gloves are too thin for the high voltages involved and just make work clumsy.

if you are careful and know what you are doing will will not get shocked. i have been dealing with CRT's since i was 10 and worked for the last 5 years as a service tech. never once been shocked by a CRT. nor have i seen any deaths. seen plenty of others shocked.

[qwertypo1]

Great video. Worked just fine.

[oscar2hot4u]

i have lifted a flyback on my tv when it was on my heart was going so fast and now my heart is fucked it beats so fast and i have bad circulation of blood and u can see my vanes dose any 1 know to 2 stop this ?

[zorahk270]

um are you an idiot?

[RazorSAID]

Could somebody help me? I'm new to this TV DIY repairs, are all anodes the same even if the suction cups are different size. Because I'm trying to replace an anode from my working but small tv to non working but on an old HDTV. So is this safe to do?

[bhieko11]

are you a gay no need for that the glove screw etc..to discharge the crt..

[zorahk270]

the glove can protect you from getting killed.

[WindowsAndMacintosh]

The CRT can remain charged for up to 3 years.

[Aparsanlal]

Hey does anyone know how long would it take for a crt tv to lose its charge by itself? because i have that has been unplugged for a little over two months i think.

[desertman123]

years

[TheNilvarg]

Is there anything cool you can harvest from a broken TV?

[438426x1]

omfg...... take a guess.....

[TheNilvarg]

WOW, GOOD ANSWER. THANK YOU FOR YOUR INCREDIBLE INSIGHT.

Douche.

[neildaust]

Worked great for me, thanks.

[CatholicBoy1957]

Better safe than sorry. Take all the precaution you can. Experienced people can make a mistake too. Thank you for the video.

[hboy007]

Oh come on. The typical red cables are rated 30kV. There are binding regulations as to how much radiation is tolerable and you will have a damn hard time shielding 100keV x-ray with a block of lead glass.

@ Gunbu talking about high voltage safety and wearing silly rubber gloves is a disgrace. Either you make sure to connect the screwdriver to ground potential or you get some adequate rubber gloves (besides, they are quite thick and cost a fortune)

have a safe and productive day :)

[fireball01e]

"the typical red cable" that makes no sense, you rate cables by gauge, colour coding is not a universal practice (also cables are rated by ampage as well as voltage). Fly backs will charge upto 80KV during screen energizing (but at low amps), when the set is off the flyback can store upto 25KV (more if you have a bigger TV (25KV @ 10amps). 97KV is nearly the same voltage as transmission lines (100KV(UK)). remember the voltage dont kill you, its the amps.

[propcycle]

average 19" or 25" monitor operates at 20kv. Nothing even approaches 40kv, let alone 80 or 97.. $50,000 CRT video projectors in flight simulators max out around 37.5kv, any higher than that and any CRT emits X-rays and needs lead shielding.

The high voltage attracts electrons to the CRT face -- the higher the voltage, the faster the electrons hit the phosphor & brighter it is, which is why projection sets use higher voltages. Direct-view sets don't need voltages higher than 25kv typically.

[438426x1]

i have a huge crt tv and its 40kv, i have no idea what ur talking about

[jcaster2012]

Adequate gloves are rated according to standards. That kitchen glove is a joke and sure to provide no protection. Not to mention how it would look if you messed up and died wearing a pink glove and cartoon pajama pants.

[MKUltraProject]

I poked a screwdriver in there one time after the monitor was unplugged out of curiosity and holy shit does it scare you. Didnt know that i was discharging it.

[SmashCOBamberg]

ok... this works. GREAT VID, I RATED 5 STARS!!!

[SmashCOBamberg]

I´m gonna try this now... I´ll post another comment when i´m readdy.

[tedescucci]

The flyback transformer isn't an issue when the monitor is off. The fact that the the tube acts as a giant capacitor is the main issue with monitors that are turned off.

Still though, shorting across the flyback's leads WHILE attached to the monitor is still a good way to do it, so this should still work correctly, but for different reasons.

For the flyback, NEVER go near that thing while the monitor is on... if you mess with it while the monitor is on, then you'll learn why not to do that. ;p