Do magnets really affect Television's components?

Question

i.e. Screen, etc.

Answer 1

Only sets that use a CRT (cathode ray tube... aka picture tube) are susceptible to magnetism.... LCDs, Plasmas, and DLPs are immune to it. As one poster said (in a rather lengthy, but unnecessary fashion) the electron beam in the picture tube is deflected by magnetism and the color can be distorted according to the strength of the magnetic field. I must say, his lesson in how a crt works was pretty good, but he failed to qualify which sets are susceptible and which are not.

Answer 2

To answer the question as you have asked is very simple, None of the components are affected by magnet in as much as damage is concerned , it is the shadow mask inside the CRT that gets magnetised and pulls the electron beams off course so that they strike the wrong phosphor hence the mixed up colour !however even the ancient CTV had a degauss circuit to take care of this problem or if very strongly magnetised then a manual de gauss wand was used to set the screen right again , but damage NO.
I have dealt with this problem more times than I have had a hot dinner .. Cheers Pete
PS Give the ten to Adorabil as he earned it with his sheer typing effort.
Nearly forgot ,,, only CRT s are affected by magnetism !

Answer 3

Yes they do.

When a television receives a signal, it first splits off the audio (sound) signal and the picture signal from a carrier wave (which is used to allow the signal to be transmitted over long distances). The audio is sent straight to the speakers to produce sound. The picture signal consists of three elements, red, green and blue. A standard television has three 'electron guns' at the back of the set, one for each colour. Let's start by looking at the red signal.

The red signal is fed into one of these 'guns'. The gun produces a beam of electrons that varies in intensity with the strength of the red signal. This beam is fired towards the tv screen. The electron beam starts at the top-left of the screen and magnetic fields are used to 'sweep' this beam across the screen in parallel horizontal lines (if you look closely at a tv screen you can see these lines). UK televisions (PAL) have 625 lines and update the picture 25 times per second, US televisions (NTSC) have 525 lines but update 30 times per second.

The back of the tv screen is covered in phosphor 'dots' (pixels) which glow when they are struck by these electrons. The red-signal electron beam is aimed so that it strikes phosphor dots that glow red, emitting photons which the eye can detect.

The same process occurs for green and blue; each colour signal goes to one particular electron gun which excites just the dots of that colour, the signal tells the gun how strong it should be which in turn means some dots glow brighter than others. When you sit back from the tv screen, you don't notice the dots nor the flicker, your eye blends the image together to give a clear picture which appears to move.

Now to answer the question! A magnet distorts the picture as it distorts the path of electrons flowing from the electron gun towards the screen inside the tv. As electrons are negatively charged particles, their motion is distorted by a magnet. So it is these electrons, not photons, which are distorted by the magnet.

On older tvs, damage caused by holding a magnet too close to a tv could be permanent; newer tvs tend to have a demagnetisation process when you switch them on, to ensure that the picture is not permanently distorted.

Answer 4

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Answer 5

Yes

Answer 6

Yes go buy a big one and put it against your TV

Answer 7

Yepp learned that the hard way

Answer 8

yes. it causes interference and makes splotchy color in the tv.

:o]

Answer 9

try it!