Over the air reception of analog TV signals with ghosting

If a tall building reflects radio waves, the antenna receives the same signal at a different time, so you can adjust the antenna height by using the Yagi antenna.

Move the antenna and turn it to a pleasing angle.

Ghosting is generally a signal problem, LCD-TV does not have ghosting itself when receiving TV analog signals, it is not caused by placement or intensity, it is the line impedance mismatch, which is more difficult to deal with! You should find a professional to fix it for you.

There must be a problem with ghosting, it may be a problem with your tuner, it may be a problem with the signal source, it may also be a problem with the separation of your whole TV signal, decoding, take advantage of the warranty period, find the manufacturer, hurry up.

It could be an issue with response time, what's your response time?

8ms can rule out the problem of response time, if there is no ghosting when the VGA outputs, it is only possible.

Problems with signals or signal lines.

Generally, it is a signal problem, and the signal is adjusted.

You can see that you know a lot and dare to do it. I will answer your questions one by one

1. Regarding ghosting, if the receiving wireless produces ghosting, it is caused by multiple reflections of electromagnetic waves, due to poor reception position, or high mountains, or tall buildings. If a closed-circuit signal is received, after careful adjustment, each station has ghosting, which is caused by mid-circumferential detuning.

2. Ghosting and high-pressure packs have nothing to do with it. One of the knobs on the high-voltage pack.

It is to accelerate the adjustment of the pole voltage, and it is originally able to adjust the brightness. The other knob is the focus adjustment, and the character is: focus .

3. It doesn't matter if the ghost is and the voltage of the 3 guns, as long as the traces on the high-voltage package do not leak, it doesn't matter, don't worry about it.

4. Regarding the adjustment of the middle week, under amateur conditions, you must adjust it yourself, please pay attention to 3 points: 1. The tool should be suitable and carefully screwed.

Change the station before and after the inspection once.

Answer 1: The TV signal reception environment is not good or the high-frequency head is poorly grounded and shielded, such as a tall building near the receiving point, the TV receives the reflected signal reflected by the tall building while receiving the direct signal, resulting in image ghosting; In addition, if the high-frequency head is shielded or poorly grounded, it will also cause ghosting;

2. Poor acoustic surface filter, when the electrode piece inside the acoustic surface filter is poorly grounded, it will cause a part of the intermediate frequency signal to directly enter the image through its distributed capacitance ahead of the main signal, so that the image will be ghosted;

Because the screen refresh rate is much slower than the frequency of sunlight, just like shooting the screen with a mobile phone or camera will flicker, it depends on the refresh frame rate of the screen! The refresh rate of the average computer ranges from 60-85, which can be set!

Brother, this is difficult to answer you, there are many reasons for the ghosting of the TV, the signal, the high-voltage package, the regulator, the phase tube, etc., will have an impact, you better carry it to the repair shop to repair it, you can take it back tomorrow and continue to watch it, be careful when you disassemble it yourself

Good luck with your TV soon**

The general causes of ghosting in TV images are:

1. Poor receiving environment or poor grounding shielding of high-frequency heads, such as tall buildings near the receiving point, the TV receives the reflected signal reflected back by the tall building while receiving the direct signal, resulting in image ghosting; In addition, if the high-frequency head is shielded or poorly grounded, it will also cause ghosting;

2. Poor acoustic surface filter, when the electrode piece inside the acoustic surface filter is poorly grounded, it will cause a part of the intermediate frequency signal to directly enter the image through its distributed capacitance ahead of the main signal, so that the image will be ghosted;

3. The image quality enhancement circuit is faulty, and many large-screen color TVs have added image hooks to the image processing circuit in order to enhance image clarity, that is, the so-called image contour correction circuit, if the circuit has an error in the processing of the first signal, it will form a ghost.

The troubleshooting method for ghosting on TV images is as follows:

1. Turn on the color saturation of the TV to the minimum, if the image has ghosting, you should check the antenna input system, high-frequency head, etc

Whether the SAW filters and their shields are well grounded and whether the clarity enhancement circuit is normal. Conversely, if there is no ghosting in the image, check the luminance delay line (including the circuit elements around it) or the ribbon pass filter circuit element;

2. Measure and check whether the final stage of the TV or the accelerating pole voltage is too low;

3. Use the resistance measurement method to confirm the suspected components, such as whether the picture tube is aging or whether there is leakage, whether the brightness delay line, resistance, etc. are open;

4. Use component substitution methods, such as high-frequency heads, acoustic surface filters, manifolds, chromaticity bandpass filters, and luminance extensions.

If the voltage and resistance measurement method cannot be confirmed by the voltage and resistance measurement method when the time line and related capacitance are defective, the replacement method can be used to check them one by one;

5. For ordinary users, it is generally recommended to contact the after-sales service or professional maintenance personnel of the TV for comprehensive testing and warranty of the TV.

Basically, the VGA signal output by the TV box does not match the display, but there is a way to adjust it.

Go to the monitor menu and adjust the clock and phase, and you should be able to remove or reduce the shadow.

I have encountered a similar situation before, and the specific principle is not clear, but I know that it may be caused by the reflection of the signal emitted by the TV station many times because there are many tall houses around my house.

You can also try the following:

whether it is subject to external interference;

Try other channels, if other channels are normal, most of them are problems with the TV station;

Whether the coaxial cable (i.e., the cable TV box and the cable connected to the TV) is in poor contact or broken;

Adjust the fine-tuning of your TV to see if it works.

For users who use outdoor antennas, check whether the outdoor antennas are in good condition, whether there is poor contact or disconnection, and readjust the position and direction of the antenna;

The color system of the TV is set correctly, and the color system is set to Auto or PAL.

Answer: There are several reasons why the TV picture is blurry and ghosted, and the problem can be solved according to the specific reasons: 1. If the image of the TV is blurred when it is turned on, but it gradually improves after a few minutes of start-up, it may be because the moisture in the air around the TV enters the tube base of the TV, resulting in the poor focusing performance of the TV. You can replace the header of the phenomenon tube, or use a hair dryer to blow on the back cover of the TV for 2-3 minutes, and dry the water in the header; 2. The aging of the socket of the picture tube of the TV leads to the blurring of the image of the TV.

It is recommended to contact the TV after-sales service for specific verification and verification; 3. If the image is blurry when the TV is turned on, it will gradually become clear after 20 minutes, which is generally caused by the dampness of the tailstock of the picture tube, and you can buy a new picture tube and replace it; 4. Try to move the position of the TV to see if it is normal; 5、If the above methods are not improved,It is recommended to contact the after-sales service of the TV for specific verification。 100 times more attentive, 10 points satisfied.

Signal problems, too strong or interference.

1. There is a tall building near the receiving point, and the TV receives the reflected signal reflected by the tall building while receiving the direct signal, resulting in image ghosting; 2. When the electrode piece inside the acoustic surface filter is poorly grounded, it will cause a part of the intermediate frequency signal to pass through directly, and the capacitance distributed by it enters the image ahead of the main signal, so that the image will be ghosted.

Why doesn't this phenomenon occur when watching replays?

If something goes wrong, what else can I do, either it's damp, or the motherboard is soldered and I want to adopt it.

Radio waves sent from TV station towers are almost always transmitted in a straight line, and are called "direct waves". When a direct wave is received by a TV antenna, a TV image appears on the TV. During the transmission of radio waves, if they encounter high-rise buildings, they form "reflected waves".

Transmitted waves may also be picked up by TV antennas, but later than straight waves. If both signals are received by the TV antenna, the image will be ghosted on the TV screen. If you encounter a few reflections, multiple ghosts can form.

In addition, because the photoelectric scan line of the TV is from left to right, the reflected wave "shadow" that arrives later in the antenna always appears on the right side of the main image.

Why do ghosts appear on TV?

This is because the TV signal sent by the TV station transmission tower belongs to the "microwave", it is a straight line propagation (visual wave), the distance of propagation is very limited, that is, the distance of the human eye can see the TV tower, the general transmission radius is about 30 kilometers, after the direct wave is received by the TV antenna, the TV will appear normal TV image that is accompanied by sound. However, if your living environment is blocked by high-rise buildings and other buildings, then this visual wave will be constantly "repeatedly" "reflected" and received repeatedly by outdoor or indoor antennas, so that there will be a phenomenon of "ghosting" on your TV screen.

If you encounter ghosting interference during viewing, you can eliminate it by adjusting the angle of the outdoor or indoor receiving antenna. However, if the living conditions are poor, and there are too many buildings and too dense, then they can only be overcome by adding outdoor antennas. This situation can also occur in remote mountainous areas, and there is no good way to overcome it.

If you completely overcome ghosting and watch CCTV in the city and satellite TV in the suburbs and mountains, there will be no ghosting.

The TV antenna receives multiple reflected waves, causing the TV image to ghost.

Orienting the TV antenna solves the problem.

Ghosting is caused by interference from analog electromagnetic signals.