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All quality CRT TVs are automatically de-gaussed on switch-on. That's the 'toooong' you hear when they turn on. A magnet might temporarily mess up the magnetic
by simonblack 3y ago
All quality CRT TVs are automatically de-gaussed on switch-on. That's the 'toooong' you hear when they turn on.
A magnet might temporarily mess up the magnetic convergence with magnetised spot areas, but that should be fixed on next switch-on.
The Earth’s magnetic field can also affect the picture
That's because when the convergence controls are set correctly, they also take care of the magnetic field of the earth too at the same time. If you turn the TV upside down, you would also have to reset the convergence controls. No biggie, but it is something that needs doing.
- philipswood 3y agoI tried this with a really big speaker magnet on the family TV as child and found that it persisted after switching it off and on. My dad (at the time a technician maintaining TV transmitters) finally fixed it by power cycling it a few dozen times. He told me that if he hadn't known how it works I'd have had the hiding of my life...
- toast0 3y ago> A magnet might temporarily mess up the magnetic convergence with magnetised spot areas, but that should be fixed on next switch-on. A large enough magnet (or other trauma) can permanently warp the mask or grille --- this is basically unrepairable. The degauss system should undo magnetism eventually, but sometimes it takes several activations.
- Kuraj 3y agoCRT computer screens would also have a "Degauss" option in the on-screen display.