Does the digital LCD TV have a high voltage package?

TV high voltage packageIt is a very important component, if the TV high-voltage package is damaged, it will affect the normal operation of the TV, and it is necessary to master the correct method to replace the new high-voltage package of the TV, so what is the high-voltage package of the TV? How to replace the high-voltage package of the TV? Below we will give you a detailed answer, I hope you can help after reading it.

What is a TV High Voltage Pack?

The high-voltage package is commonly known as the line output transformer, and the output of high-voltage direct current is the role of the high-voltage package. This is exactly the same as the high-voltage pack in a TV. When used in televisions, it is used to accelerate the electronic screen to achieve sufficient brightness, and when it is used in computer LCD screens, it can supply power to the lamp tube to make the screen reach sufficient brightness.

Early black-and-white televisions mostly used discrete line output transformers (commonly known as line packs). The common fault of this kind of line output variable Zen state pressurizer is that the cylinder of the high-pressure packaging silicon column is ignited and arced, which is easy to cause the inner wall to break down and deteriorate, but most of the coils are not necessarily damaged.

How to replace the high-voltage package of the TV?

The model of the high-voltage package in each TV display is different, and the repairer should pay attention to the model when changing the high-voltage package of the TV. In this way, a series of unnecessary dangers can be avoided.

Turn off the power of the TV, use the table pen of the multimeter (you can also make one according to the same) to discharge the high-voltage bag, because after the TV is turned off, there will be part of the residual high voltage, first connect the metal needle at the short end of the watch pen to the ground wire on the side of the picture tube, and then hold the plastic part of the watch pen, and insert the watch needle between the high-voltage bag and the picture tube for discharge.

Pull up one side of the high-pressure bag left and right, and use the needle-nose pliers to clamp the spring clip with your right hand and pull it out obliquely from the side where the high-pressure bag is pulled. Weld off the high-voltage wire and clamp from the high-voltage pack, remove the high-voltage pack, thread the high-voltage wire into the new high-voltage pack, and weld it to the clip.

A layer of insulating silicone grease is applied to the circumference of the high-voltage nozzle edge of the picture tube 2-3 cm to prevent moisture ingress and leakage in the future. In the reverse order of removing the high-pressure pack, the high-pressure pack, together with the clamp, is loaded into one side at an angle, and then pushed in on the other side of the clamp between the pliers. Rotate the high-pressure bag left and right and press it tightly, so that the clip is in full contact with the high-pressure nozzle.

After removing the discharged grounding wire, check that it is correct, and then use it.

The above is to bring you what is the electric hand type video high voltage package? How to replace the high-voltage package of the TV such as Heshuyuan? All of it.

Kiss! The high-voltage pack of an old-fashioned television set is an electronic component that raises a low voltage above tens of thousands of volts, and is often used in power supply circuits. Older TVs have been phased out due to the widespread use of technologies such as sail liquid crystal displays and LED backlights in modern TVs.

However, as an electronic component, the high-voltage package still has some wonderful uses, such as: 1Laboratory Teaching:

The high-voltage package can be used for laboratory teaching, such as high-voltage arc experiments, electrostatic experiments, etc., so that students can better understand the principles of electricity. 2.Make insecticidal lamps:

The high-voltage package can be combined with fluorescent tubes to make insecticidal lamps, and the high voltage is used to decompose the air into oxygen ions, nitrogen ions and free radicals, etc., and the ultraviolet rays are produced to kill insects. 3.Making a sterilizer:

High-pressure packs can be used to make sterilizers, which use high voltage to convert oxygen molecules in the air into ozone, thereby killing bacteria and viruses. It should be noted that when using the high-voltage package, it is necessary to pay attention to safety and avoid problems such as electric shock and short circuit. It is recommended to follow safe operating practices such as wearing insulated gloves and using insulated tools.

No. The display principle of liquid crystal is different from that of ordinary displays, so it does not need to use a high-voltage pack.

Traditional televisions, which use picture tubes, must emit light through phosphors when displaying images, so the brightness is increased and the high voltage is increased, so a high-voltage package is required. The CRT display cathode ray tube used in CRT display is mainly composed of five parts: electron gun, deflection coil, shadow cover (shadow mask hole, shadow cover plate), phosphor layer and glass shell.

The CRT display cathode ray tube is an active light-emitting device, and its light source is an electron gun. The principle of ordinary TV is that the high-voltage package generates high voltage and hits the screen of the cathode, which is scanned line by line, so there is a display frequency.

LCD is the abbreviation of Liquid Crystal Display, that is, liquid crystal display, is a digital display technology, which can filter the light source through liquid crystal and color filters to produce images on a flat panel. The structure of the LCD screen of an LCD monitor is completely different from that of the cathode image tube of a CRT monitor.

The working principle of LCD TV is as follows: the LCD screen consists of two polarizers, two glass plates plus liquid crystal in the middle, and a backlight source, as long as the power is turned on, the liquid crystal can change the direction of light. The LCD consists of a glass with many thin-film transistors, a color filter with red, green, and blue colors, and a backlight.

First of all, the liquid crystal display uses a backlight, that is, a fluorescent tube, to project light, which passes through a polarizer and then through the liquid crystal, at which point the arrangement of the liquid crystal molecules will change the angle of light that penetrates the liquid crystal; The light then has to pass through a color filter and another polarizer in front of it. Therefore, by changing the voltage value at both ends of the liquid crystal, the intensity and color of the light that appears at the end can be controlled, and different shades of color combinations can be displayed on the liquid crystal panel. Liquid crystal displays are passive light-emitting devices that cannot emit light on their own and must rely on a backlight to display an image.

Advantages: Compared with traditional cathode ray tubes (CRTs), LCD has a small footprint, low power consumption, low radiation, no flicker, and reduces visual fatigue. Disadvantages: More expensive compared to CRT of the same size.

Who said that LCD TVs must not have a "high-pressure package"? LCD TV is divided into LEDs according to the backlight, cold cathode fluorescent lamps, etc., cold cathode fluorescent lamps LCD has a high-voltage package, but it is very different from the CRT high-voltage package, small and low voltage, known as a step-up transformer.

He's the same as the phone display, hehe.

This high-voltage package device can only be used as a high-voltage generator.

1. The high-voltage package of the old-fashioned color TV, the full name is "line output transformer", which is a special step-up device for the line output stage. Its working principle is that under the action of 15625Hz line frequency current, the secondary output transformer will produce a high-frequency voltage of more than 10,000 volts, which is the anode high voltage of the picture tube;

2. Make a simple low-frequency transistor ** circuit, and use it to drive the line output transformer to generate high voltage;

3. The output high voltage is turned into DC high voltage (small current) through the high-voltage rectifier tube + high-voltage filter capacitor, which is used in places that require high voltage. The schematic diagram of the simple high-voltage power supply is as follows:

4. If it replaces the "high-voltage power supply" used in teaching, it can do experiments such as spark discharge and electromagnetic wave emission demonstration of Maxwell's experiment. But you must pay attention to safety in the experiment.

It can only be used in the line output circuit of color TV.

The TV is one of the important components inside the high-voltage package TV, which is mainly responsible for the basic voltage required for the imaging of the TV; Generally, there are problems or failures in high-voltage packs, which will produce the following phenomena:

1. The black screen of the TV is not imaged: the failure of the high-voltage package will lead to insufficient power supply of the TV display element (such as the picture tube) and a black screen;

2. Protective standby occurs when the TV is turned on: the failure of the high-voltage package will cause the working current of the internal circuit of the TV to increase, the line will become hot, and the TV will enter the protective standby state after it is turned on;

3. If the high-voltage package fails, such as high-voltage ignition, it will damage the pipe of the TV or damage other components after a long time;

4. If there is a problem with the high-voltage package, it is generally a hardware problem, and it is recommended to contact the after-sales service of the TV for a comprehensive inspection and warranty of the TV.

The line current is large, the line pipe is broken, the high-voltage package is ignited, etc.

Judgment of the quality of the high-voltage package of the color TV:

Mainly look at the change of +b voltage, if there are three none, the measured +b voltage is about 70V;

The main voltage is low, the line tube heats up quickly, and even the smell of heat can be smelled, which can determine that there is a problem with the line change.

Have fun!

Most of the quality of the high-voltage package of color TV is the local short circuit between the high-voltage coils or the bad high-voltage diode, and the slight is that the high-voltage package is overheated, the brightness decreases, and the line amplitude widens. At the same time, the output tube is severely heated. Serious ones are burn-in tubes and power adjustment tubes.

The easiest way is to listen carefully to whether the degaussing coil has a "jing" sound at the moment of booting. Yes, it means that the high voltage is working, and the circuit is not being tested.

The question is unclear and cannot be answered.