I know that bringing a magnet near a crt can because with it because it interferes with the magnets in the tv. However, what I don’t understand is why this affects can be permenant, with discolouration and other issues still being present once the magnet is removed.
In: Technology
At the back of the TV is an electron gun (that’s actually what it’s called). The stream of electrons coming out of the gun are steered to phosphors on the glass with magnets. If you use an powerful outside magnet to redirect this stream of electrons you can end up burning out some of the phosphors by focusing too much energy one a small spot. This will permanent damage the phosphors.
Several reasons but generally, a magnetic field from a magnet or magnetized object near the front of the CRT can introduce a permanent magnetic field in the phosphor coating on the back side of the screen that actually forms the picture you see. It’s just like when you rub a magnet on the tip of a screwdriver and make the screwdriver tip magnetic. The magnetic field distortion can be removed with something called a “degausser”. It’s basically a coil of wire that’s plugged into a AC outlet and “erases” the magnetic field from the phosphors when it’s held near the screen. Worked in a TV shop when I was a kid and my job was to “degauss” the screen after the TV was repaired.
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