"Magnet damage" in this case refers to when the internal parts of the tube have been affected by a magnet being brought near then which messes up a bunch of things and may make the display seem unusable, however it can sometimes be fixed (depending on severity.) The display needs to be degaussed there are 2 main ways to do this. Magnet damage, screen is badly distorted in colour and/or geometry. Check for failed components surrounding the flyback circuit, if something is not working correctly then flyback could be creating too high voltage which can cause arcing and damage to the tube. Bad connections includes the one with the CRT and the socket, check for any sign of corrosion or other build-up on the CRT pins and in the socket. Any cracked trace can mean high voltage is arcing across it, causing a smoke smell and crackling sound, If any are found them repair them with whatever method you choose.
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