Where did the snowflake screen image of the old TV come from?

My childhood memories. Television sets were a rarity, and at that time televisions were still black and white, and they were bulky, just like the old computers in the past, and they would have heavy shells. On the other hand, at that time, the installation of a TV set also had to install an antenna that could receive signals and some outdoor equipment, which is equivalent to being more troublesome now, and the development of TV sets is also a historical witness for the whole society.

Because it mainly relies on the antenna to receive different TV signals, you can watch different TV stations, the previous signal reception is not much, and there is often a weak signal, or there is no signal, at this time, there will be a snowflake screen phenomenon and will make an unpleasant sound. When I watched cherry balls before, their TV was also because of the bad signal, but my grandmother took two shots, which is also a method, at least for us who were anxious to watch TV at that time. Now let's look at this question again, how did the snowflake screen on TV come about?

According to a lot of information, some people think that this snowflake screen is caused by the fact that the TV cannot receive radiation from the universe, but at that time, the TV was not as advanced as we imagined, and could receive radiation from the universe. So what does this snowflake screen come from? In fact, at that time, the TV was a bit similar to the radio, because the frequency of the electromagnetic waves of each channel was different, so the received signals were also different, and the picture that came out was naturally different, if the electromagnetic wave fluctuated or interfered, then there would be a snowflake screen.

The world is constantly moving, not static, even if it is static, it is only relatively static, so the snowflake screen is caused by the movement of many unstable particles to each other, a state. It is for this reason that there is a snowflake screen that we hate. Now life has changed very differently from the past, so there is no need to worry about the snowflake screen.

The snowflake screen image of the old TV comes from all levels of amplification circuits and various clutter entered by the antenna, many of the post-80s have seen it, and later the technology is better and there is a color TV, and it becomes a blue screen.

Snowflake screens come from signal interference or signal fluctuations. When the signal is relatively weak, TV reception will produce certain fluctuations or even cannot be received,At this time, a snowflake screen will be generated。

When the TV does not receive the signal, the noise signal generated by the clutter from the various levels of the amplifier circuit and the antenna of the TV amplifier circuit is displayed on the TV screen, and it becomes a snowflake screen. It's like the rustle we hear when we use the radio (amplitude modulation) when we don't have a station.

How it works.

When a high-frequency current is applied to a conductor, an electric and magnetic field is generated in the space around it. According to the distribution characteristics of electromagnetic field in space, it can be divided into near zone, middle zone and far zone.

Let r be the distance between a point in space and the conductor, and the region at r 2 is called the near zone, and the electromagnetic field in this region is closely related to the current and voltage in the conductor. In the region of r 2 is called the far zone, in which the electromagnetic field can leave the conductor and propagate into space, and its change will lag behind the current and voltage on the conductor for a period of time, at this time, the electromagnetic wave propagating out is no longer directly related to the current and voltage on the wire, and the electromagnetic field in this area is called the radiation field.

It must be noted that when the length l of the wire is much smaller than the wavelength, the radiation is weak; When the length l of the wire increases to a wavelength comparable to that of a wavelength, the current on the wire increases considerably, resulting in a strong radiation.

According to you, TVs, set-top boxes are all possible. You can rule it out and connect the set-top box to another TV and see if there will be this problem. Yes, it's a set-top box, and if there's none, it's a TV. If it's a TV, you'd better find a manufacturer for after-sales.

It's not impossible to repair it yourself, that is, to replace one or two devices, maybe a frequency latch, or a signal memory chip, and the specific circuit should be measured. But after you finish repairing it yourself, the manufacturer will not give you a warranty.

This is due to the influence of certain electromagnetic waves.

The signal is not good, and the background electrical noise affects it.

It's a common TV natural phenomenon that doesn't make much of a difference.

I don't know the model function of your TV,Did you accidentally get some unique settings,Take a good look at the manual,Understand the function thoroughly,Then draw conclusions。

There are several possible causes and solutions for snowflakes on TV channels: 1. The problem of TV program sources. Workaround:

Satellite set-top box 1 and pot lid are shifted in the direction of the satellite, resulting in weak signal lead. Solution: You need to adjust the position of the lid of the small pot accurately.

2. There is an obstacle in the direction of the satellite where the lid of the pot is aligned. Solution: Remove the obstacle so that the direction of the lid is kept open, and there should be no obstruction.

3. The signal cable connecting the set-top box is loose, resulting in a weak signal. Solution: You need to reconnect the signal cable to restore the signal.

b.The signal line of the wired set-top box 1 and the signal line connecting the set-top box is loose, resulting in weak signal. Workaround:

The signal cable needs to be reconnected to restore the signal. 2. The front-end of radio and television will suspend the broadcast of individual programs. Workaround:

There are several reasons:1、If the TV display is normal when it is turned on,It becomes a flower screen after use,The brightness of the screen becomes brighter after becoming a flower screen。 2. You can first try to check whether the cable of the TV is normal.

3. If it is a blurred screen caused by the color display of the screen. Suggested processing methods: 1. You can use the measurement logic board.

GAMMA to correct the voltage, the most common is the AS15-G class fault, you can touch the AS15-G with your hand or gently touch the tip of your nose to see if the AS15-G is hot and hot.

If it feels hot or hot, it can be judged that the AS15-G is malfunctioning; Then measure whether the voltage of each gamma is normal to determine which gamma has the wrong voltage, and then replace it with a new AS15-G to restore normal. 2. If the wiring of the TV is abnormal, then reconnect and then restart, if this problem is not solved, it is generally due to the failure of the hardware inside the TV. 3. Generally, it can be judged that it is the problem of the LCD screen itself.

Because the LCD screen display image is to have a backlight and a circuit that can change the direction of the liquid crystal arrangement, the circuit controls the three color pixels of the liquid crystal RGB respectively, and once the LCD screen fails, it will lead to a blurred screen. 4、Due to the above two reasons, the TV screen screen involves disassembly inspection and maintenance,It is generally recommended that users contact the after-sales service staff of the brand TV to conduct a comprehensive inspection and maintenance of the TV。

The main reasons:

2. The signal of the TV is interfered by external electrical appliances, resulting in horizontal stripes, just find out the source of interference and eliminate it.

3. The hardware failure of the TV leads to horizontal stripes, mainly the failure of the screen line or poor contact contact, the failure of the display screen, the failure of the internal display circuit, or the failure of other components, etc., it is recommended to contact the after-sales service of the TV to overhaul the TV.

Extended Materials. Maintenance tips.

Tip 1: Try not to let the LCD TV work for a long time or continue to display the same picture. Because the screen of the LCD TV is displayed by LCD pixels to form a picture, the LCD TV works for a long time, or the same picture is always displayed, which will overheat the LCD light emitting tube and cause internal burnout.

Therefore, when users are not watching TV, they should turn off the monitor or turn down the brightness of the monitor in time. Users should try not to press the pause button while enjoying a CD to keep the screen displayed.

Tip 3: Keep your TV dry. Televisions are highly technological, and although they can work in a humid environment, they can only "work as usual", not "work normally".

Moisture can be very damaging to televisions. Therefore, even if the user does not watch TV for a long time, it is best to turn on the power on regularly, so that the heat generated when the monitor is working will drive the moisture out of the machine.

Tip 4: Clean the screen properly. If the screen is dirty, it is best to use a professional cleaner to wipe it gently with a soft cloth dipped in a little water, but not too much water, because the water will enter the LCD and cause the screen to short circuit.

If you find fog on the LCD, you should gently wipe it off with a soft cloth in time before you can turn on the power. If moisture has already entered the LCD, it must be placed in a drier, warmer place to allow the moisture to evaporate sufficiently.

Tip 5: Never disassemble the LCD by yourself even when it is not plugged in. Because it has been turned off for a long time, the CFL converter in the TV's background lighting component may still have a high voltage of about 1000 volts.

Voltages of 1000 volts can also cause serious personal injury. In addition, even if the user is not electrocuted, incorrect operation can lead to temporary or even permanent damage to the display.

Under the LCD display: The snowflakes on the display will not move If it will move, it should be caused by the dirty data cable or graphics card slot Clean up the dust of the graphics card It should be much better If it is a new monitor, it may be a bright spot or color dot under the flat display: exclude the case that the graphics card is gray Do not rule out that there is a problem with the display picture tube.

Solve the problem of screen of death on boot There are three situations that usually cause the screen to die on computer boot: 1Splash screen is a relatively common display failure, and most of the screen failures are caused by the graphics card itself.

If you can occasionally enter the system or enter safe mode (F8), first reinstall the graphics card driver; Then it is to clean up the gold finger, which can generally be solved. If the system can't get in, it is very likely that the video memory is damaged, and often when the system starts, there will be a blurred screen of confused characters, in which case the graphics card or video memory bar must be replaced.

2.If the temperature is too high, the fan of the graphics card is not good, or the air duct in the case is not good, resulting in too high temperature, and the temperature is high in summer, which is more common; Feel the temperature of the memory chip with your hand to check whether the fan of the graphics card is stopped. Then look at the AGP slot on the motherboard to see if there is any dust, check whether the gold finger of the graphics card is oxidized, and then clean up the dust according to the specific situation, wipe the gold finger with an eraser to polish the oxidized part.

3.The power of the power supply is insufficient. If there was nothing wrong with it before, this can basically be ruled out; Lessons learned:

If you encounter a blank screen on the computer, first look at whether your graphics card is an integrated graphics card or a standalone If it is integrated, then it may be that there is a problem with your memory module If it is independent, then there is a problem with your graphics card Please refer to the first article to solve it.

The snowflake screen we see is actually from the universe.

It's because the signal is not good and can't be received.

The snowflake screen is because sometimes the signal is not good!

caused by interference with radio signals.

The TV signal may be poor.

It is because of poor contact with the picture tube.

It may be because of the failure of the TV, there are some problems on the display screen.

Interference with radio signals appears on the snowflake screen.

This snowflake screen is actually from the universe.