I most definitely did NOT
drag a magnet all over my auntie's new tv screen when I was 10, completely bolloxing it forever.
(Leemondus, Tue 20 Sep 2011, 20:26, 9 replies)

ever about half an hour, at the most.
( monster munch person, man, woman... camera... TV?, Tue 20 Sep 2011, 20:51, closed)

ever seen it?
It fades a little but it never goes away.
(gtfomh, Tue 20 Sep 2011, 22:50, closed)

To fix.
Either get expensive degaussing coil.
Or take magnet, scrub over screen. Move magnet to distance of 1mm, and flip over. Repeat, increasing the distance gradually until you're about 3 magnet-lengths from the screen.

Take care not to scratch the screen.
(speedevil, Tue 20 Sep 2011, 23:57, closed)

I held a speaker to the side of an old PC monitor,
in the school computer lab, and convinced myself that I had permanently warped the screen, but it was all fine when I went back the following day.
( monster munch person, man, woman... camera... TV?, Wed 21 Sep 2011, 9:00, closed)

You lirrul scamp
Knew I shouldn't uv bought you that magnadoodle
(Kazza , loathing myself so you don't have to, Tue 20 Sep 2011, 21:57, closed)

Turning it on and off a few times would degauss the screen I would think.
( The Resident Loon Not a demographic. Do not measure., Wed 21 Sep 2011, 0:20, closed)

What?
I did this to my grandma's telly when I was wee, and I was given a thorough bollocking. It took months for my parents to pay back the money to replace the set, and I was in trouble for pretty much the whole time...

And now you tell me it's not permanent damage? Well fuck that. Somebody owes me for months of ruined childhood. I'm getting back to work on that flux capacitor and I'm gonna set this straight. Either that or I might phone my grandma tonight and give her some choice expletives.

"Hey Grandma, you're a fucking bitch!"

Nah, I won't. She's lovely. And it's probably not an appropriate call for somebody on their deathbed.
(leviticus no longer likes the cut of your gib on, Wed 21 Sep 2011, 15:01, closed)

I've heard that the working classes never switch off their televisions.

( Ring Of Fire A petty, drooling belming butthurt retard., Wed 21 Sep 2011, 15:55, closed)

The people above are right, it was easily cured.
TVs back then didn't have degaussing coils built in, which is why it didn't go back to normal like the monitor someone described.
However, using the same magnet carefully it would be possible to demagnetise (or at least adequately remove the magnetism you imparted) on the mask of the TV by simply using the opposite end of the magnet to the one you used on each patch (the method speedevil mentions will probably work also).
I have done this to many CRTs with an assortment of magnets.
(Me, I'm not... in any way intoxicated, Wed 21 Sep 2011, 18:58, closed)