Anyone know anything about degaussing a TV?

[TechHead87]

I need some help on mechanics of degaussing a TV. Are there different strengths with different degaussers?

 

[JimPhelpsMI]

Hi, Don't know exactly what you want to know but - TV's (and Monitors) have had automatic degaussing for many years. It's a coil of wire, about 50 turns (about 1/2" total diameter) wrapped with tape around the big end of the CRT. It's is supplied with an AC voltage for about .5 to 1 second every time you turn the power on. It is to remove any magnetism from the the tube. As the crt is deflected by magnetism from coils on the neck any extra mag will distort the picture (raster). A thermal resistor was originally used to control the degaussing coil and automatically turned the coil off after a short time. If the auto degaussing fails a large hand held magnet powered by 120 VAC and intended to erase mag tape, can be used by passing it over the entire face of the tube. Hope this helps a bit, Jim

 

[NuroMancer]

Originally posted by: JimPhelpsMI
Hi, Don't know exactly what you want to know but - TV's (and Monitors) have had automatic degaussing for many years. It's a coil of wire, about 50 turns (about 1/2" total diameter) wrapped with tape around the big end of the CRT. It's is supplied with an AC voltage for about .5 to 1 second every time you turn the power on. It is to remove any magnetism from the the tube. As the crt is deflected by magnetism from coils on the neck any extra mag will distort the picture (raster). A thermal resistor was originally used to control the degaussing coil and automatically turned the coil off after a short time. If the auto degaussing fails a large hand held magnet powered by 120 VAC and intended to erase mag tape, can be used by passing it over the entire face of the tube. Hope this helps a bit, Jim

The TV should be off before you use a magnet should it not?

See I was always of the opinion that passing a big magnet by your tv was a bad idea, I saw a Prof do it once, and it fed the TV up.

 

[Geomagick]

A permanent magnet or a dc powered electromagnet should not be used for this. Jim Phelps suggested using an AC powered electromagnet, which will just mimick the degausing coil within the tv.

Edit I would do it with the TV off.

 

[0roo0roo]

there are degausing wands u can buy. not sure why u'd need it.

 

[GalvanizedYankee]

Read the degaussing section in total. Note that Sonys have sensitive aperture grills.

http://www.repairfaq.org/sam/crtfaq.htm


...Galvanized

 

[JimPhelpsMI]

Hi All, The TV does not have to be off. Left on you will see the areas needing degaussing and see when you have it right. Using the automatic requires turning it off and then back on. A DC or Permanent mag will cause the problem. The AC coil removes the Magnetism if the voltage is removed gradually which the thermal resistor does. Removal or magnetising with AC depends on what part of the AC cycle the power is removed. Using a manual coil you keep it on and move it away from the area before shutting it down. Jim