Fixing Purity Error on CRTs with a Degaussing Coil
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- Опубликовано: 15 янв 2012
- Demonstration of the placement of magnets on the front of a CRT-based television monitor. This video shows the use of a degaussing coil to fix the resulting purity error problem. For my first year Media Technical Theory students in the School of Radio and Television Arts - RTA - at Ryerson University.
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Precise and to the point while still being entertaining. Great vid. I’ve seen similar videos that were 15 mins of rambling. Thanks for not rambling.
James Pyle Some examples of those videos ? 🤔
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My dad was a TV repairman in the 60s and used one of these on ours and our Gram's TVs now and then. I always wondered why and how it worked. Now I know! 🌝 I am glad I found your short and sweet video. Thank you!
Brought back memories for me, too. My dad had a TV sales and service shop for years and he would wave that degaussing coil in front of TVs like a Jedi when he was setting them up. It fascinated me, especially since it seemed to be a melding of science and art
Your presentation style is so easy to watch, and entertaining as well. I'm pretty jealous :) You clearly have years of experience with this.
Hi Dana!
Thanks for this video. It brings back memories of hanging out with my dad at work at NBC Studios in Burbank. They had CRT monitors that had a degauss button. As a ornery kid, I loved to push it. That was the only time I ever saw gaussing or degaussing.
I was reminded of it today, and thus went and found your great video here, because a friend texted me the misspelling "gauss" instead of "guess" in a conversation today. I asked him if he knew what gauss actually meant and he said no. I shared this video with him and told him about my days at NBC.
+Bret Leduc "Gauss" means actually lots and lots of stuff. He was a German genius mathematician and in the process had all kind of stuff named after him.
If you are curious, take a look at "List of things named after Carl Friedrich Gauss" on Wikipedia.
This is classic. Still remember this from a lecture 13 years ago. Awesome.
Didn't understand this in office hours so googled it to understand more, and the first link was another Dana video. Love it.
Barring a proper degaussing coil, a reasonably strong bar magnet being rotated in front of the screen can also do the job.
Can a color impurity that resulted from a drop be degaussed too?
@@IllusionSector No.
@@IllusionSector it is likely that the coils inside have shifted and you may need to adjust those, but be careful. Tens of thousands of volts are waiting to shock you once you start prodding around
@@ElectronicInspiration the electrocution isn't so bad after the 6th time.
@@IllusionSector not likely. The shadow mask probably shifted off position a little bit.
decades later and I finally know what the degaussing button on my school monitors actually did, and that I never actually used it correctly
Virtually all CRTs have a built in degaussing coil, they work automatically every time you turn the TV on it cycles briefly, but they only do it a tiny bit at a time, so it might take 100 times to fully work, that's where the coil comes in handy, you can do it in just a few seconds.
He came closer and smiled in my soul at the end of the video.
You are a gentleman sir!! I have a slight issue on my PVM after shipping. I will try and do this :)
Totally awesome.
This would have been great to know back when I broke our living room tv in the 90s with a magnet wand.
Great information , thanks for sharing that.
Ah you've demonstrated this in media tech theory class three years ago. Good times.
Great video!
This is so cool!!!
i lold @ the and its fine part
youre very good at speaking.
Dat Oops.
presentation style was very good
Great stuff as always... You really should do more of these Dana. Though if it was up to me all of your Tech Theory classes would be online >_>....
Brilliance
Will a magnet mess up a crt screen if the tv is turned off and unplugged? Does the tv have to be on for the magnets to mess it up? Thanks. Great video by the way.
Nice vid
My friend and I found a 1987 Montgomery Ward TV I believe. It has slight discoloration in the upper right hand corner of the screen it's doesn't look like a magnetic field has caused this. What it does look like to me and this is my opinion but I could use some second feedback. Is that one of the capacitors could be overheating or going out in it. Would you be able to help me with this.?
do crt tvs have an internal degausser? I heard that most modern sets will activate their internal degausser when the TV is turned on after cooling down/has been off for awhile
More contemporary CRT monitors do, indeed, have an internal degausser. If the magnetic 'damage' is major (like throwing magnets on the front of your screen all the time), the internal system might not be sufficient to totally get rid of the purity error. But you are right, there is one built in!
+Dana Lee thanks :)
great...so how do I fix a magnet stain on my TV? it's a huge black blob.
Tip: By plugging out the TV plug and put the plug again the Color patch will go away. (Might only work for some TV)
Markiplier talked about degausing a crt and I thank you
Hey, I have a Sony bvm d32e1wu , that has some discoloring bottom left corner of screen will this work degauss button does, not fix it.
That's definitely a CRT-based monitor. Give it a try!
Dana Lee
I have a Sony Trinitron CRT TV 32 in. Theres a green tint on the upper left corner of the screen. Will a degaussing coil fix the problem? :/
I have a Sony FD Wega Trinitron and the image is bowed towards the top pushing left then in the middle is pushing right. Is it possible to fix that with a coil or magnet?
Maybe. It can't hurt to try a degaussing coil - a magnet will cause more problems, though!
Electromagnetism is such an interesting thing.
1:04 Every sad Magnetic 🧲 ☹️ CRT degaussing coil clean😂😂
Watching this in 2021
THANKS, OBAMA.
aperture grill not shadow mask on this instance.
would that work on a CRT arcade monitor?
Joaquin morales Yes it would!
Dana Lee awesome! Thank you!
Bar it being a vector display.
can this fix a letterbox burn in?
no
no
I need one of these but they're so expensive......
It's possible that purity error can't even be fixed with a degaussing coil, if the shadow mask is very highly and permanently magnetized. If that's the case, then you're pretty much out of luck. Time for a new picture tube - if you can even find them these days.
your wrong if ya wana know y ask me
@@davidknightaudio934 I'm gonna hazard a guess that this person who literally teaches a class on these might just have a better clue than you do about these things.
Don''t let me stop you from speaking up, though.
@@davidknightaudio934 Why is he wrong???
Noo está televisión sordo noo está vivo muerto televisión
I'm not sure how this has anything to do with purity..
and you can't even do this with modern screens, gj science
All modern CRT Tv's had an automatic degaussing circuit that performed the same function. If the set will not degauss itself you have a potential power supply problem where the PTC Globar resistor has broken loose from it welded connections. You did the procedure wrong . Once you got back about 8 feet from the set you should have turned the Degaussing coil at right angles to the tube screen and then turned off the Degaussing Coil. Manually degaussing the set wills till be required each tome the set is turned on, especially if the set is moved to another location.
This guy literally teaches a class.
That's a pretty error.
How the fuck did you not get ANY flicker off those TVs?
What's your magic trick?!
exactly
fixed or upgraded capacitors and diomes?
Wtf! Wow