How Do I Degauss a CRT TV?

Written by darla ferrara
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How Do I Degauss a CRT TV?
Degaussing a CRT (pc monitor image by Jorge Casais from

Degaussing eliminates an undesirable magnetic field. A CRT is a screen that uses a cathode ray tube. Many units with this category of tube use a metal plate to focus electron beams. This plate picks up strong external magnetic fields that interfere with the colour on the monitor, causing it to blur, also known as a shadow mask. Modern CRTs have an internal coil that activates when the power comes on in the unit. These coils tend to be less effective than an external degaussing coil. While the physics behind degaussing are complicated, the process is not.

Skill level:
Moderately Easy

Things you need

  • Degaussing coil

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  1. 1

    Turn off your monitor. Let it sit for a few minutes, then turn it back on.

  2. 2

    Look for a button on your CRT labelled "Degauss." You will probably find it on the front of the unit near the colour adjustment buttons. If you are unable to locate it, consult the manual that came with the product.

  3. 3

    Scroll through the menu options if you are unable to locate a button. You may see choices such as "Screen Size" and "Positioning;" "Degauss" should be nearby. Select the "Degauss" option from the menu. The screen will flicker as it degausses.

  4. 4

    Purchase a degaussing coil from an electronics store. This will only be necessary for older units. Most modern units will degauss automatically when turned on or allow you to degauss manually through a button or menu option. A degaussing coil is a 110-volt, 60-cycle coil inside of a plastic shield.

  5. 5

    Plug the coil in, hold the coil out in front of you and switch it on.

  6. 6

    Move towards the screen and swing the coil around in small circles. Wipe it across the face of your screen, starting with small circles and widening until you reach the edges. It should take approximately five circles to reach the edge of the monitor.

  7. 7

    Continue circling the coil, step two steps back, away from the screen, and stop for a few seconds while still circling the coil. Back up again, this time moving a couple of feet back as you circle. Turn the coil off.

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