How to demagnetize a TV at home

Self-demagnetization of the mask

In order for the kinescope to demagnetize when image distortions become visually noticeable, it is usually enough to turn off the TV receiver for a few minutes (10-15). But if this does not help, you can go in two ways: the first is to change the faulty parts of the preset factory circuit, the second is to remove the magnetization with a special external device. But first, you should check what the true cause of the defective picture is: in the magnetic field of the CRT or in another malfunction.

Demagnetization with an external device

To demagnetize a highly magnetized CRT mask (PC monitor or TV screen) yourself, it is best to use a purchased inductor or a homemade inductor.

demagnetize, home

Important! Only CRT TVs can be demagnetized using the above external devices. The operation of modern television receivers equipped with plasma panels or LCD displays is organized on completely different principles.

To demagnetize the kinescope using a choke, a number of operations must be performed:

  • remove all electrical devices that can affect the magnetic field of the TV (speakers, power supplies, etc.);
  • turn on the TV receiver (monitor) and let it warm up for 10 minutes;
  • place the choke parallel to the screen at a distance of 2 m from the TV and turn it on;
  • slowly approach the TV receiver, making circular movements with the throttle, the diameter of which must be gradually reduced;
  • coming up to the minimum distance, within 3-5 seconds. make several circular movements with the throttle around the perimeter of the screen;
  • slowly, without stopping circular movements, move away from the TV to the starting position;
  • turn the throttle perpendicular to the screen and turn it off.

After that, iridescent streaks and color spots will disappear. The whole procedure should not last more than 15-30 seconds in order to prevent strong heating of the throttle. At the same time, performing the above operations, you do not need to pay attention to strong color distortion on the TV screen, as well as to the sounds made by the throttle (buzzing, howling, etc.).

Demagnetization by other means at hand

You can demagnetize the picture tube mask using other available means, for example:

  • a coil of a magnetic starter designed for an alternating current voltage of 220-380 V;
  • an iron in which the sole is heated by a spiral;
  • electric shaver;
  • the included electric drill with a powerful neodymium magnet attached to the drill;
  • powerful pulse soldering iron.

In this case, the procedure remains unchanged, and the main condition for obtaining a positive result is the magnetic field power sufficient for demagnetization.

Attention! A permanent magnet cannot be used to demagnetize the CRT. You can see how dangerous it is in the video (starting from the 2nd minute)

So, demagnetizing a shadow mask is not difficult at home, but for this you need to have, if not special equipment, then at least knowledge of the features of EMF electrical engineering. But if it was not possible to remove rainbow stains and color spots from the TV screen using the above methods, then, most likely, the shadow mask in the CRT has moved. It is impossible to repair this defect, in this case it will be necessary to change the picture tube directly or purchase a new TV.

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From time to time, owners of old CRT TVs are faced with the fact that colored spots or stripes appear on their screens, which to some extent distort the image. Such defects indicate that it is necessary to demagnetize the shadow mask of the kinescope.

Reasons for magnetization

The shadow mask of an electron beam tube (hereinafter referred to as a CRT or kinescope) is a structural element of a kinescope made in the form of a raster grid. As a rule, it is made from Invar (an alloy of iron and nickel), which has a small coefficient of thermal expansion.

The shadow mask in the CRT design provides the projection of blue, green and red electron beams onto the phosphor layer. During operation of the TV, the electromagnetic field created by its nodes (transformer, speakers, etc.) magnetizes the mask, which can cause the electron beams to converge incorrectly. This in turn contributes to the appearance of distortion on the screen.

To avoid this effect, picture tubes are equipped with a special device that must remove the magnetization from the shadow mask. It includes a kinescope demagnetization loop and a posistor.

Reference! A posistor is a thermistor, the resistance of which increases when heated. They are also called PTC thermistors (PTC. Positive Temperature Coefficient, from English. positive coefficient of resistance).

Defects caused by strong magnetization of the mask do not indicate a breakdown of the kinescope and can be easily eliminated by the owner of the TV with his own hands. It should be remembered that the functional unit preinstalled in the TV receiver, which prevents the magnetization of the mask, is activated only when the TV is turned off.

The reasons that lead to the magnetization of the CRT mask, experts divide into two groups:

  • defects resulting from prolonged operation of the TV and the failure of parts of the demagnetization system;
  • malfunctions caused by external factors.

Demagnetization by other means at hand

You can demagnetize the picture tube mask using other available means, for example:

  • a coil of a magnetic starter designed for an alternating current voltage of 220-380 V;
  • an iron in which the sole is heated by a spiral;
  • electric shaver;
  • the included electric drill with a powerful neodymium magnet attached to the drill;
  • powerful pulse soldering iron.

In this case, the procedure remains unchanged, and the main condition for obtaining a positive result is the magnetic field power sufficient for demagnetization.

Attention! A permanent magnet cannot be used to demagnetize the CRT. You can see how dangerous it is in the video (starting from the 2nd minute)

So, demagnetizing a shadow mask is not difficult at home, but for this you need to have, if not special equipment, then at least knowledge of the features of EMF electrical engineering. But if it was not possible to remove rainbow stains and color spots from the TV screen using the above methods, then, most likely, the shadow mask in the CRT has moved. It is impossible to repair this defect, in this case it will be necessary to change the picture tube directly or purchase a new TV.

Making a choke with your own hands

If it is not possible to purchase a factory device, then a demagnetization choke can be made by hand. To do this, you need to take a mandrel with a diameter of 100-200 mm and wind from 600 to 900 turns on it with a PEL-2 wire. Wire diameter. 0.15-0.8 mm. Having removed the resulting winding from the mandrel, a power cord with a standard plug is connected to it, and then carefully insulated with electrical tape. And to use the device conveniently, a power button is located on the cord. Visually, the process can be viewed at

Advice! If there is no good posistor at hand, then you can simply drop the faulty one out of the board. In this case, the TV will begin to broadcast the picture without distortion, but the mask will quickly magnetize again. first in the corners of the screen, and soon rainbow stains will appear on its entire surface. Therefore, this method can be used exclusively as a temporary measure. until a new posistor is soldered.

After installing a working posistor, it is recommended to demagnetize the kinescope. To do this, the TV must be turned on and off several times. In this case, the interval between cycles should be at least 15 minutes, which will allow the new unit to cool down. over, if the mask is slightly magnetized, then the demagnetization process will be successful and the color spots will disappear from the screen. If the stains remain, then you can demagnetize the TV at home only with the help of an external device.

Causes of the problem

The main problems include the following:

  • a malfunction is formed in the TV itself during its prolonged use (that is, it does not depend in any way on external factors);
  • a malfunction is formed under the strong influence of external factors, namely, such as. the close location of the speaker system; a magnet that can lie next to the TV or when exposed to the magnetic field of other devices (uninterruptible power supply or transformer stabilizer).

From this it can be understood that, in general, no one is immune from the appearance of this problem on the TV. However, it should be remembered that the irregular occurrence of magnetization is very rare. On the other hand, if this situation appears under the direct action of devices or mechanisms with a strong magnetic field. To avoid such problems, you should carefully consider the place where the TV is located. If there are similar devices that were described above, you should remove them as soon as possible so as not to harm the normal operation of the TV and maintain a high-quality image.

How to fix the problem that happened

There are two most common ways to correct this situation, which are working and can help everyone with this problem. Data include the following:

When using a choke, remove all objects that may obstruct or disturb the magnetic field. When the device is plugged into an outlet, it must be brought perpendicularly to the picture tube. After that, you need to turn it so that the plane of the turns becomes perpendicular to the glass and for 3-4 seconds make circular movements near the screen, and be sure to capture the edges. After that, you need to turn it back to a perpendicular position and slowly begin to move it away from the TV at a distance of at least 3 meters. As a rule, this method is useful and corrects the situation with magnetization.

The problem of color distortion and the appearance of increasing bands of different colors along the edge of the screen usually occurs with TVs with a cathode ray tube (CRT). Many people think that their TV is completely broken, and they buy a new one. But in fact, this defect is easy to eliminate, since these problems are the result of excessive magnetization of the TV picture tube, that is, you just need to demagnetize it.

Poor quality magnetic tapes are light brown and are often used to park card or fair tickets. These bands are much more sensitive and they are already demagnetized from 30 mT. Field intensity up to 3 mT is safe. In mechanical watches, strong magnetic fields can magnetize certain components such as coil springs. They then interact with other metal components of the movement or with the watch case. As a result, the watch can move forward or backward.

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This watch must withstand a magnetic field of 60 Gauss, i.e. after exposure to a magnetic field of this intensity, they should not have a step change for more than 30 seconds per day. In the case of a non-magnetic watch, it is difficult to point to a safe distance. If you want to go to a safe place, you must maintain a safe distance so that the magnetic field matches the natural one, i.e. about 0.05 mt.

This happens if there are electrical devices near the TV that create a magnetic field during their operation. These are speakers, a music center, and a computer.

How to demagnetize your TV screen?

There are two ways to demagnetize the CRT:

You just need to turn off the TV, unplug it and leave it at rest. Due to the fact that the kinescope demagnetization loop is located inside the TV, the defect should be eliminated the next time it is turned on. The rest period for each TV is different.

If a mechanical watch is inadvertently magnetized and does not work properly, the watch device can degate it with a special magnetizing device that generates an alternating magnetic field. A quartz analog clock can be affected by the presence of a large magnet, as the motor is impeded by the presence of an intense magnetic field. They may start faster, slower or stop completely.

Loudspeakers for remote coils of communication between two hearing aids or between a hearing aid and a remote control. These problems can be as follows. Noise jump reduced remote control distance bi-directional radio interruptor or accessory. Block the readhead motor to affect the position of the printhead or damage the printhead. The fixed drives of small laptops, which are usually found in the base of a computer, are more sensitive to permanent magnets.

In more modern TV models, there is a demagnetization function in the monitor menu. To use it, you just need to find this feature and turn it on. After that, the screen will turn off for a few seconds.

If this method did not work, you should use the following.

Method 2. using a demagnetizing choke

Intentional Data Erasure: If you are going to permanently erase data on your hard drive, using a permanent magnet is not a suitable method. Instead, you use data erasing programs that repeatedly overwrite any existing data on disk.

What is the ideal place for a good sleep? Quite simply, in this case, the bedroom. If you have a TV, at least turn off the main switch or disconnect the plug, not just the remote control, which will leave the unit in standby.

Remove all electrical appliances near the TV.

  • Turn off the TV and unplug the plug.
  • Take a choke.
  • Turn it on 50 cm away from the screen.
  • Making circular movements in a spiral, you need to bring the device closer to the center of the kinescope by 2 cm.
  • Move the throttle from edge to center (concentrically), and then in reverse order.
  • In a circular motion, move it away from the TV at a certain distance.
  • Turn off the device.

All of the above steps should be completed in 40 seconds.

Your best bet would be to have no wires passing by the bed, especially near the headboard, because these distant magnetic fields can cause problems with large cells. Living cells, in addition to everything that we know at the organic level of energy exchange, are also small electrical emitters with their typical biomagnetic field.

There is also another conversation related to blood, because blood is made up of red blood cells and therefore hemoglobin and hemoglobin are iron based. Basically they work a little like magnetines placed on a table, they tend to look at each other.

Before you start demagnetizing the TV screen with a choke, be sure to consult with a specialist. You should know that you can demagnetize only a CRT TV, but not. since his work is arranged according to a different principle.

Hello everyone!

How to demagnetize a TV at home with a magnet

No, “bagels” and trances are excluded I have nowhere to take them, it’s easier to take them to the workshop. If you only use an ordinary round magnet to move,

I will carry out manipulations with on-off, I will also try to find the service menu.

I tell you point by point. 1.Remove the monitor from the TV for good.
2.turn on the TV set
3. turn off the TV set from the remote
4.turn off the TV set with the button on the TV set
5.Unplug the power cord
6.Wait a day
7.connect in reverse order

the regularity of the repetition depends on the degree of kinescope deadness

Thanks for points 1. Removed the tape recorder.
2-6 Completed.
7. I’ll try.

And nothing happened to the tape recorder? It does not need to be demagnetized?

You take the magnet. Well, you drive, bringing closer, removing.

But the best option is a conventional transformer wound on a W core, which is not closed.

I wrote those below. in circles but a magnet to pull, and Sh. the heart is the same. current circle. it gives the correct result.

Quite often, users of old TVs could face a problem when it started to work poorly. This could be identified by various colored spots on the screen, stripes, or an irregular image. All these features are a vivid example of the fact that the picture tube mask is magnetized and it is necessary to demagnetize it.

Since this only happens with old TVs, nowadays it is more and more difficult to find a specialist who can professionally carry out demagnetization. That is why many people may often be interested in the question of how to demagnetize a TV on their own at home.

Quite often, in the practice of repairing CRT TVs, there is such a malfunction as the appearance of color spots on the screen or seemingly unreasonable blown of the protective fuse.

Colored spots. Basically, they are formed at the corners of the kinescope and do not appear at once, but within a certain time. It may seem that the manifestation of such a malfunction tells us about a failure. kinescope. but, I hasten to calm you down, kinescope here it is not to blame and is quite workable. Such a “spotted” image indicates demagnetizing or magnetizing screen our TV.

This makes the blood less fluid, thicker and less coagulated. This means that it is not only less able to oxygenate tissues, but it also increases the risk of cardiovascular disease. So this is not just a “feng shui trend”. And it must be said that the standard bedroom is done this way, especially the spouses have appliqu├ęs to the left and right of the head of the bed, so with walled power lines and with power outlets to the left and right of the heads of those who sleep in bed.

A system to overcome this. if the size of the room allows it, place the bed in the center. By the way, one thing is to have an electric light on your leg, one is to have it on your brain. What about people who support their cell phone all night long?

If the TV has not been turned off from the network for a long time, but turned off using the remote control (it was in standby mode), then the CRT may magnetize. The fact is that in most CRT TVs, the demagnetization system begins to work when the TV is turned on to the network, and if the device is constantly connected to the network, then demagnetization does not occur when the TV is turned on from the remote control.

This is really awful! Electrical power over cellular radiation. Do you have a cell phone in your hand when you talk for 3-4 minutes? Why is the situation complicated at night? Let’s not forget that the body regenerates at night and is therefore less immune to all external pitfalls.

Even the immune system, which reboots during deep sleep, minimizes its activity. This explains why the factors that can be handled when we are awake at night can create big problems, especially if we go beyond our immediate physical and mental abilities and go back for a minute to talk about long-term well-being.

The principle of the demagnetization system is as follows: when you turn on the “network” button on the TV, the voltage begins to flow to the posistor, which, in turn, feeds the demagnetization loop of the kinescope located on its band, i.e. on the back of the screen. When the TV is demagnetized, the PTC resistor limits the power supply to the loop. And so every time you turn on the TV to the network. And if your device is constantly in standby mode, i.e. turns on and off only from the remote control, then the power on posistor and the power supply is supplied continuously (this can be observed by looking at the LED on the TV panel) and the demagnetization system is constantly turned off. That is why it is recommended to disconnect the TV from the 220 V network at least once a week.

Keep in mind that there are circuit breakers or bioswitches that completely cut off current in both wires can actually help us eliminate electromagnetic night pollution. Simply put, turn off the current in the bedroom with the main switch before bed.

Another important thing is to check that you are not surrounded or partially surrounded by metal cages: beds, as we will see, and nets or walls containing iron. The risk is that a Faraday cage, that is, a conductive structure that insulates what it contains inside the electromagnetic fields from the outside, which ultimately is not very good for the body.

“A posistor is an ordinary thermistor that changes its resistance depending on the temperature. In the cold state, the resistance of the posistor is very small (5. 15 Ohm), in the heated state, more than 10 kOhm. The posistor is turned on directly into the TV power circuit in series with the demagnetization loop. When the TV is turned on to the network, the resistance of the posistor is small and current flows through it to the demagnetization loop. After heating, the PTC thermistor gives more resistance, which prevents the voltage from passing through the loop. By design, posistors may differ, but they are all interchangeable. “

Otherwise, electromagnetic fields will alter the functionality of melatonin, as we will see, it is a high-intensity hormone in sleep management. We do not even hear them, but electrical appliances, even in standby mode, are absolutely silent and also waste a lot of energy. Try to remove them from the bedroom and remember to turn them off in other rooms.

It’s good at rest, it’s good for the environment, and you use less electricity. It might be overkill to remember, but aerating the room by renewing the oxygen supply can make a difference. As breathing travels through the lungs and through the lymphatic system, one of the hidden drivers of daily detoxification, letting our body breathe more oxygen during this moment of relaxation may make a difference.

Also, this malfunction may appear if the posistor itself fails. If you turn off and turn on your TV several times from the network, and the spots do not disappear, then this indicates a failure of the posistor, which should be replaced.

Another option in which the posistor may be guilty is when the mains fuse blows. In this case, the power supply is in good condition. In the posistor, in this case, when voltage is applied to it, a short circuit occurs and, accordingly, the entire voltage supply to the TV is short-circuited. As a result, the protective fuse burns out.

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However, let’s not forget that often modern, concrete or mostly tuff dwellings are more polluted inside and out, because building materials release invisible, odorless, but toxic volatile substances into the environment, such as, for example, radon gas.

Another good reason is to often ventilate the room and avoid living quarters sealed all over the house with aluminum fixtures and triple glazing that, in addition to creating a cage, make us live in the air. And the point is also to pull out Conglomerated Subtle Energies.

When you need it?

A sign of magnetization is the appearance of multi-colored or dark spots on the TV screen, usually they first appear in the corners of the screen for a certain period of time. In this case, people think that their “old friend” will soon fail, so it is necessary to look for a replacement for him. Another category of citizens is sure that in such a situation the kinescope will soon “sit down” and it is necessary to look for a replacement for it. But in both cases, people are wrong. nothing needs to be done except following some recommendations.

There is a fairly simple way out of this situation: you should demagnetize the shadow mask of the kinescope, which is part of the cathode-ray tube.

With the help of such an element, various colors (blue, green and red) are projected onto the CRT phosphor. In the production of TVs, manufacturers equip them with a posistor and a coil (a posistor is a thermistor that changes resistance when the temperature changes, usually made of barium titanate).

The posistor looks like a black case, from which 3 contacts come out. The coil is laid along the CRT band. These elements are precisely responsible for ensuring that the TV does not magnetize. But when the TV stops working for this reason, this does not mean at all that any of these elements is out of order. It is still necessary to check them.

How to demagnetize a TV?

Nowadays, many people buy expensive TV sets that make life much easier for a person. However, not everyone can afford it, and the old versions of technology still “live” to this day in many apartments and dachas. This article is dedicated to just such old tube TVs that can magnetize over time. Let’s figure out how you can demagnetize the TV yourself.

Causes

There may be several reasons for the appearance of such a phenomenon:

  • the most common problem is in the demagnetization system;
  • the second possible reason may be frequent switching on and off of the TV’s power at short intervals;
  • the device did not turn off from the 220V network for a long time (it worked or was simply on duty);
  • Also, the appearance of spots on the equipment is affected by the presence of various household items next to the equipment: cell phones, speakers, radios and other similar household items. those that cause an electromagnetic field.

As for problems with the demagnetization system, it rarely fails. But if this happened, then you need to pay attention to the posistor, because it is he who is most often susceptible to this problem. The reason why this element stops working can be considered improper operation of the equipment as a whole. For example, a consumer turned off the TV not by using a button on the remote control, but by unplugging the power cord from the outlet. This action leads to the appearance of a current surge with a large value, which makes the posistor unusable.

Degaussing methods

There are several ways to demagnetize the TV yourself at home.

The first way is the easiest. It consists in turning off the TV for 30 seconds (at this moment, the loop located inside the equipment will demagnetize), and then turn it on again. It is necessary to look at the number of places of magnetization: if there are fewer of them, then it is worth repeating this action several times until the spots on the screen completely disappear.

The second way is much more interesting. But for this you need to build a small device yourself. a choke.

To do this, you will need the following materials:

  • frame;
  • insulating tape;
  • small button;
  • a cord that can be connected to a 220 V network;
  • PEL-2 cord.

First of all, you need to wind the cord on the frame. you need to perform more than 800 turns. After these manipulations, the frame should be insulated with electrical tape. The button is fixed, the power cord is connected. Then you need to perform a number of manipulations to demagnetize the device:

  • turn on the TV, let it warm up;
  • we turn on the device for demagnetization, at a distance of 1-2 m from the picture tube, we widely rotate our device, gradually approaching the TV and reducing the radius of rotation;
  • distortion should increase as the device approaches the screen;
  • without stopping, we gradually move away from the picture tube and turn off the device;
  • if the problem persists, you should repeat such manipulations again.

Our device must not be kept under the influence of the mains for a long time. it will heat up. All stages of demagnetization should take no longer than 30 seconds.

With these manipulations, you should not be afraid of either distortions on the TV screen, or sounds that may appear when using a homemade object.

It is also worth noting that this method is only suitable for equipment that is based on a CRT. this method is not applicable for LCD versions.

If there is no way to make such a design as a choke, then you can also use the following options:

  • take the starter coil. it must be designed for 220-380 V power supply;
  • electric razor;
  • a pulse soldering iron, sufficient power to demagnetize the equipment;
  • an ordinary iron, which is heated using a spiral;
  • electric drill with neodymium magnet (included).

The procedure in this case is the same as when using the throttle. However, to obtain the desired result, a strong magnetic field is required. Some people have heard that a TV can be demagnetized using a conventional magnet. But this is not so: using such an object, you can only enhance the multi-colored spots on the CRT, but not in any way demagnetize the equipment.

Helpful hints

In order for the TV not to be magnetized, you should carefully study the recommendations of specialists presented below. In order not to face such a problem as magnetization, it is necessary to properly operate the equipment. This requires:

  • to correctly disable it: via the button;
  • give time for the equipment to rest after work.

In the event that the posistor is out of order, and there is no way to replace it with a new one, then this element can be removed from the board, and you must use a soldering iron. However, this will only entail a short-term demagnetizing effect. after a while the screen will return to its original state.

In modern televisions, magnetization is checked by selecting the Blue Screen function.

To do this, go to the TV menu and find the item of the same name. If this section is enabled in the menu, then in the absence of an antenna or a poor signal, the screen will turn blue.

So, we select the “Blue Screen” function, turn off the antenna. a blue screen appears. In doing so, pay attention to the quality of the blue tint. If the display has spots of different colors, it means that the screen is magnetized. It is worth noting that modern LCD monitors have a special demagnetization function, which is located in the equipment menu. For this reason, it will not be difficult to use it.

Reasons for the appearance of screen magnetization

The shadow mask is a structural element of the cathode ray tube.

ATTENTION! The mask is responsible for the projection of red, blue and green electronic colors onto the CRT phosphor.

To avoid the magnetization of the kinescope, TVs and monitors are equipped with a posistor and a demagnetizing coil. They work only when the device is off. If the CRT magnetization occurs, this does not always mean that the posistor or coil is out of order.

There can be several reasons for the appearance of such a problem. both external and internal.

  • Failure of one or more elements of the installed demagnetization system. This is the most common reason.
  • Turning the TV on and off frequently at minimum intervals.
  • Electronic devices at a short distance that create an electromagnetic field. This can be cell phones, speakers, radios and other household appliances.

The standard demagnetization loop fails extremely rarely. Usually it is the PTC thermistor that is the cause of the malfunction. The breakdown of this element very often occurs due to improper operation of the devices. Turning off the TV not using a special button on the remote control, but pulling out the plug from the network, causes a short-term surge of large current. Due to such a shock, the posistors fail. The opposite situation also happens, when the devices do not disconnect from the 220 network at all, which leads to their gradual magnetization and the appearance of color distortions on the kinescope.

If such a problem arises, you should not immediately contact the workshop, since you can deal with it yourself at home.

How to demagnetize your TV screen at home

Despite the huge selection of modern LSD and plasma screens, there are people who still use older CRT TVs and monitors. And very often they face various problems. One of them is the appearance on the screen of various multi-colored and dark spots. This problem is caused by the magnetization of the screen. And many begin to think that the TV or monitor is completely out of order. However, this is a fairly easily solvable problem. You just need to demagnetize the shadow mask of the kinescope.

How to demagnetize a TV at home

There are two ways to deal with a magnetized CRT:

How to make a choke for demagnetizing picture tubes? This requires the following:

  • mandrel;
  • PEL cord. 2;
  • insulating tape;
  • any button;
  • cord for 220 V network.

A cord is wound on the mandrel, you need to make about 850 turns. After that, it must be insulated with tape. On the resulting structure, the on-off button is fixed and the power cord is connected.

  • We heat the TV picture tube for a short time.
  • We supply power to the device for demagnetization. From a distance of at least two meters to the screen, we begin to make wide rotational movements.
  • Gradually approach the kinescope, gradually making the radius of rotation smaller.
  • Once the choke is in close proximity to the tube, the distortion will increase. No need to be afraid.
  • Without stopping circular movements, it is also necessary to slowly step back and turn off the device.
  • If the distortions did not disappear immediately, the procedure should be repeated.

The throttle must not be kept on for a long time. This causes it to heat up. The entire procedure must be carried out quickly enough. It should take about 30 seconds.

IMPORTANT! It is strictly forbidden to use a permanent magnet.!

It happens that both of these options do not help. This means that the posistor has failed, which must be replaced with a similar one.

To avoid re-magnetization, remember that the TV must be properly turned off and allowed to rest for a while.

Why is this happening

The main reason for the magnetization of the kinescope is the long-term presence of electronic devices in the immediate vicinity of it. In modern homes, this situation is not uncommon: microwave ovens, computers and telephones are present in almost every apartment. It is not uncommon for a TV set to be put on the microwave without thinking about whether it can be done? If your device has suffered from regular exposure to the electromagnetic field, do not rush to carry it to the workshop. You can solve the problem yourself. Depending on how badly your TV is magnetized, you can fix it using one of two options:

  • activate the built-in protection against magnetization;
  • use a device called a choke.
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Important: never use a permanent magnet to demagnetize the CRT.

Replacing a failed posistor

Turning off the device for 10-15 minutes does not always help to get rid of the problem. There are two ways to correct the situation caused by strong magnetization of the CRT screen:

  • replacement of a failed posistor. an electronic component in the circuit of a standard demagnetization loop;
  • demagnetization with a choke.

A possible cause of the malfunction is a failed PTC thermistor

If a working posistor cannot be found for some reason, then to temporarily solve the problem, it is enough to evaporate the faulty element. The transmission of the picture will be restored without color distortion for a while. After which the problem will appear again.

After replacing the posistor, the TV should be turned on and off several times at intervals of 15-20 minutes. During the disconnection of the current supply, the posistor cools down, its resistance decreases, thereby activating the operation of the demagnetization loop. For the complete disappearance of color spots on the screen, it is required to carry out 5-7 cycles of turning on / off the device.

If the built-in mechanism cannot cope with the complete elimination of image distortion, then the CRT screen can be demagnetized using a choke.

How to diagnose CRT magnetization

CRT magnetization causes distortion of the image on the TV screen. But picture distortion is possible not only due to the presence of screen magnetization. You must first clarify the reason.

CRT TVs of most well-known manufacturers (Philips, LG, Sony, Samsung, etc.) are tested for the effect of magnetization of the mask using the “Blue Screen” setting option. The diagnostic procedure is as follows:

  • disconnect the external antenna before checking;
  • turn on the TV receiver and launch the “Blue Screen” mode through the settings menu.

To check the magnetization must be activated in the settings “Blue Screen”

The appearance on the blue screen of multi-colored streaks and spots indicates the magnetization of the kinescope.

How to demagnetize the TV yourself

Many owners of outdated TVs are wondering: how can you demagnetize a TV at home? People face this problem when the device starts to malfunction, showing a distorted picture. This problem is inherent in most devices with a cathode-ray tube and is called “magnetization”.

Demagnetization with a choke

For the procedure, a factory device is recommended, as an option, a homemade inductance coil is suitable.

Factory choke for kinescope demagnetization

  • Disconnect and remove electrical appliances in the vicinity of the TV.
  • Turn on the TV, let it run for 10 minutes to warm up.
  • At a distance of 2 meters, install the choke parallel to the screen and turn on.
  • Slowly bring the device closer to the TV screen, making circular movements with it, gradually decreasing the diameter of rotation.
  • Directly at the TV, you need to outline the choke around the perimeter of the screen several times within 3-5 seconds.
  • Continuing to draw circles, you should move away from the TV to the same place.
  • Expand the coil perpendicular to the TV screen and turn off the device.

The process must be carried out very quickly (15-20 seconds) in order to avoid overheating of the throttle, without being distracted by the sounds made by the TV and color distortion.

Important! The described solution is only suitable for TVs with a cathode ray tube. It will not work to eliminate stains on LCD TVs with a throttle, since the reasons for their occurrence are completely different.

We activate the built-in protection

Each CRT TV has in its arsenal built-in protection against screen magnetization. the so-called demagnetization loop. To activate it, it is enough to turn off the device for a while and let the loop do its job.

You need to know that this loop starts working only when the device is disconnected from the power supply. The thing is that when the power is on, the voltage is supplied to the posistor continuously, and it cannot limit the supply of energy to the demagnetization loop. In this case, the demagnetization system remains inactive. Experts recommend periodically disconnecting the TV from the electrical network to prevent possible problems with the kinescope.

How to make a choke at home

You can assemble an electric magnet at home using an electric wire with a plug, an iron arc and a winding.

Take an iron arc and connect it to the electrical network by connecting with a 220V wire. Insulate the resulting device and connect it to the power supply. The sequence of actions is no different from the demagnetization process with a special choke.

If you followed the instructions in the article exactly, but your TV viewing device still shows a poor quality image or does not show it at all, a possible reason is a shift in the kinescope shadow mask. This malfunction cannot be repaired, and the only solution to the problem is to buy a new picture tube or TV. Now there are many models on the market, and in order not to make a mistake when buying, you need to know the parameters for choosing a TV. The optimal solution would be to choose a modern TV with Smart TV, powered by LED technology.

How to demagnetize the kinescope?

Unplug the TV and wait for the PTC thermistor, the so-called PTC thermistor, in the demagnetizing loop circuit to cool down. This can take up to half an hour. Then turn on the machine again. Automatic demagnetization will take place. If it doesn’t work, repeat the procedure several times. The monitor usually has a relay that disconnects the PTC thermistor and the coil from the network after demagnetization has been performed. Therefore, it cools down even when the monitor is on. To demagnetize the kinescope again, just select an item in the monitor menu called Degauss.

How to demagnetize the TV yourself

Many owners of outdated TVs are wondering: how can you demagnetize a TV at home? People face this problem when the device starts to malfunction, showing a distorted picture. This problem is inherent in most devices with a cathode-ray tube and is called “magnetization”.

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How to demagnetize a TV picture tube?

How to demagnetize a TV picture tube? Finist Now, if you remove the tape recorder from the TV, the muzzles on the screen turn green, if put back in place, they turn pink again. Turning on and off doesn’t help. What can be done to get rid of this phenomenon?

We activate the built-in protection

Each CRT TV has in its arsenal built-in protection against screen magnetization. the so-called demagnetization loop. To activate it, it is enough to turn off the device for a while and let the loop do its job.

You need to know that this loop starts working only when the device is disconnected from the power supply. The thing is that when the power is on, the voltage is supplied to the posistor continuously, and it cannot limit the supply of energy to the demagnetization loop. In this case, the demagnetization system remains inactive. Experts recommend periodically disconnecting the TV from the electrical network to prevent possible problems with the kinescope.

When choosing this option, it should be borne in mind that the loop cannot cope with the strong magnetization of the kinescope. In this case, you will have to resort to the second method.

How does a neodymium magnet work on a TV? Demagnetization of the kinescope. Posistor.

Switching on / off with a button. weak demagnetization effect, designed to maintain a uniform field, and not restore. Most TVs demagnetize the CRT if they are turned off and then turned on with the power button. We need a more powerful electromagnet. It is easier to call the master. to do something for 5 minutes. This sequence helps: first turn it off from the remote control, then turn it off with the button on the TV set, then unplug it and leave it there for half an hour or longer.

After the next turn on, if it does not help, repeat the same again. It usually helps after the first time. An ordinary magnet helps. Move them near the screen. The picture will change. Use trial and error to remove stains. I just did it and everything worked out. Helped to sharply drag the magnet along the screen from right to left several times at a distance of 20 cm from the screen.

You can use a special device to demagnetize the TV picture tube. The cost of this device is not great, it is quite possible that it will be useful to you. I began to show everything in purple tones, turn on the demagnetization function, then turn off the TV set from the outlet, wait 5 minutes and turn it on, it becomes normal, but this effect lasts no longer than a minute. Then it magnetizes again. They generally have a predisposition for this. It is desirable that the TV remain without volts for several minutes and for some models. hours.

This is the simplest and least interesting method of kinescope treatment. But there is another. The second way is at: www. The reason for the magnetization of the kinescope of your TV can be electrical appliances located next to it and having their magnetic field.

The passports of some electrical appliances indicate that the device has shielded protection. This parameter is required for some audio devices. For example, if the speakers of computer audio speakers lack shielding, this will lead to a rapid failure of the monitor that stands next to such speakers.

If the reason for the appearance of stripes on the screen was a shift in the picture tube mask, then such a picture tube or the entire TV set will have to be replaced. The magnetization of the CRT can be removed in two ways. If the magnetization is small, then the protection available in the kinescope is called a demagnetization loop, enough to cope with the problem.

You just need to turn off the TV. After it has been in standby mode for a while, the bars will disappear.

The specific time can range from several hours to several minutes. If turning off the TV did not help get rid of the stripes, then only the throttle can help. a special device with which you can demagnetize the kinescope. But first, you must carefully read the instructions for it or consult with an experienced person, since when demagnetizing the kinescope with a choke, it is of great importance to precisely follow the sequence of the necessary actions.

Detailed information can be obtained from our manager by »phone: There is nothing easier than filling out an application or calling and calling the master. And your TV will work like new! Calling the master. Baumanskaya m.