How to demagnetize your TV screen at home

Despite having a huge selection of modern LSDs and plasma screens, there are people who still use old televisions and cathode-ray tube monitors. And very often they face various malfunctions. One of them is the appearance on the screen of various multi-colored and dark spots. This problem is caused by magnetizing the screen. And many begin to think that the TV or monitor is completely out of order. However, this problem is quite easily solved. It is only necessary to demagnetize the shadow mask of the kinescope.

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

ATTENTION! The mask is responsible for projecting red, blue and green electronic colors onto a CRT phosphor.

To avoid magnetization of the kinescope, TVs and monitors are equipped with a posistor and a demagnetization coil. They work only when the device is off. If the kinescope is magnetized, 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.

These include:

1. Failure of one or more elements of an installed demagnetization system. This reason is the most common.
2. Frequently turn the TV on and off with a minimum interval of time.
3. Short-range electronic devices that create an electromagnetic field. This may be cell phones, speakers, radios and other household appliances.

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

If such a problem occurs, do not immediately contact the workshop, since you can cope with it yourself at home.

There are two ways to deal with a magnetized kinescope:

1. If the distortion area is small, then a regular system can help. The device must be turned off by about 30. If the distortion is less, then the procedure must be performed several times until they disappear completely.
2. The second way is to use a special throttle. Now it is quite problematic to find even in stores. However, it is not difficult to do it yourself.

How to make a choke to demagnetize picture tubes? To do this, you need the following:

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

A cord is wound around the mandrel, you need to do about 850 revolutions. Then it must be insulated with a tape. On the resulting design, the on-off button is fixed and the power cord is connected.

Stages of demagnetization:

1. We heat the kinescope of the TV for a short time.
2. 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.
3. Gradually approach the picture tube, gradually making the radius of rotation smaller.
4. Once the throttle is in the immediate vicinity of the tube, distortion will increase. No need to be scared.
5. Without stopping circular movements, it is also necessary to slowly step back and turn off the device.
6. If the distortion did not disappear immediately, the procedure should be repeated.

The throttle must not be kept on for a long time. This leads to its heating. The entire procedure must be carried out quickly enough. This should take about 30 seconds.

IMPORTANT! Never use a permanent magnet!

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

To avoid re-magnetization, it should be remembered that the TV must be turned off correctly and allowed to rest for a while.