Do you remember the weird crackling sounds when you turn off tube televisions, which are now a nostalgic element? Why does this sound that causes slight scratching when it occurs at night?
Tube televisions are now a thing of the past, they are almost nonexistent in our homes. Now we can only come across them in villages, summer houses or neighborhood tradesmen. One of the iconic items of the 90s and early 2000s, this with tube televisions almost all of us have a memory (Like putting your finger close to the screen and feeling the electric current).
If you’ve owned or used an old tube television before, sometimes when you turn it off, a crackling sound You may have noticed that it was removed. This sound could be quite frightening, especially at night when it was quiet.
To understand why, we must first understand how tube televisions work.
Ours ‘tube televisionthe name we call ‘ CRT (Cathode-Ray Tube, Cathode Ray Lamp) televisions These types of televisions, which have a very high voltage, circulate electricity in them. So high that this voltage It can reach 25,000 V.
The crackling sound is due to this high voltage used to create the images on the screen. These devices come from an electron gun in the part we call the ‘tube’. They work by sending a beam of electrons to the phosphor-coated screen. Electrons collide with the phosphors and cause an explosion, thus creating colors and shapes on the screen.
This information is in the pocket, what is causing the crackling sound?
inside the tube of the television to control the direction and speed of the electron beam. high voltage is applied to a metal sheet. This creates an electric field that bends and focuses the beam. (This is why if you put a magnet close to the tube television screen, you will destroy the television).
This high voltage is cut off when you turn off the TV. but not immediately, because it takes some time for the electrical charge to dissipate from the sheet metal and other components inside the television. While the charged electricity in the television is discharging, some of the charge may leak out or leak through the gaps, causing sparks or can cause electrical leaks..
It is these sparks that produce the crackling sound we hear.
(If in the air of the environment where the television is If there is heavy dust, This crackling sound is more likely to be heard when the TV is turned off. As you know, dust mostly consists of dead skin particles, and this high voltage attracts them. Dust caught in the current can also cause a crackling sound.
At the same time, the temperature change is also inside the television. because it causes the expansion of the metal sheet Could be the source of the crackling sound. In both cases, the result is due to electrical currents.)
So, does the high voltage that makes this crackling sound harm you?
Unless the crackling sound is too frequent or loud will not harm the TV or you. It is a normal phenomenon that occurs in many electronic devices that use high voltages, such as fluorescent lamps or microwave ovens. However, if crackling sounds are heard frequently or very loudly, it is possible that there is a problem with the tube television.
How? May increase the risk of sparks or short circuits on high-voltage components. dust, moisture or corrosion if any. Apart from these, it may cause leakage or overheating. a loose or damaged cable or connector If so, the same is true. These problems can damage your TV and even may cause a fire hazard.
Can the crackling sound be prevented from tube televisions?
To prevent or reduce crackling sounds from tube television they need to be kept clean and dry. heat, humidity, or heat, such as a radiator, humidifier, or speaker Avoid placing near magnetic field sources.
when turned on or off, as this may distort the electrical charge and cause sparks. The TV should not be touched or moved shortly after turning it off.. Of course, since we didn’t know these things, we always used to run the finger on the electric screen.
Today, tube televisions seem to have disappeared; LCDs, LEDs or OLED TVs are more common. We can sometimes miss these televisions with a nostalgic feeling, but the antiquity of their technology and how much compassion it takes When we remember, it would not be wrong to say that there are no more tube televisions…
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