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why are magnets harmful to a television screen?

the color will center on the screen of a television screen if you hold a magnet up to it

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  • 1 decade ago
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    The reason for picture distortion on CRT Televisions is because an electron gun is constantly bombarding the screen with electrons that, upon impact, illuminate the screen to the desired color. Magnets have the power to bend moving electrons quite a bit. A really strong magnet can really screw up a television set, so be careful.

    Source(s): Electrical Engineer- Cal Poly San Luis Obispo.
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  • 1 decade ago

    The electrons that are generated inside the TV tube are guided to where they have to strike the inside back of the screen, by magnetic fields inside the TV. So, it would make sense that a magnet on the front of the screen would also deflect the electrons as they reached close to the front of the screen -- deflect them to the wrong places at the wrong times. An electron out-of-place will make the picture look weird (out of focus, wrong color, etc.)

    Sometimes the metal inside the screen can become magnetized by the magnet, so it acts like a magnet when you pull your magnet away, causing permanent distortion.

    There is a large demagnetizing coil inside the TV that is supposed to take care of this kind of thing, but it doesn't always work if you accidentally put a very strong magnet near the front of the TV. A TV repairman has a special tool that can demagnetize stuff that the TV can't do on its own.

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  • 1 decade ago

    Simply put your TV screen uses magnets to display where the beam hits. electrical impulse and magnetic forces are always have 90 deg. influence. your screen collects dust so fast because of these fields. A short try with a magnet won't hurt the TV but prolonged use will. It can be fixed but why play with it.

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  • 3 years ago

    that is going to be unable to. The magnet led to the phosphor coating on the interior the CRT to alter right into somewhat magnetized, which attracts the three electron streams from the crimson, green, and blue electron weapons to strike the section "off-middle" of its meant colour. it would clean up finally. It relies upon on how sturdy the magnet became. My son did the same situation to my laptop exhibit screen some years in the past, and the rainbow diminished...after purely approximately a 365 days! If that is not any longer a great exhibit screen and you could locate the money for it, i might purely replace the television.

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  • 1 decade ago

    the electron beam can be considered as a set of charged particles which are manipulated by the magnet placed close to the TV. any charged particle moving in a magnetic field experiences a force, and that is how it works here too

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  • 5 years ago

    very confusing aspect. browse using google. that will help!

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