Dark spots around the edge of the screen. Causes of spots on the screen and how to fix the defect
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I welcome everyone! Today I will share my thoughts on what to do if spots appear on the TV screen, monitor, laptop or tablet. For the past few years, Samsung has been a leader in the production of matrices for TVs, monitors, laptops, tablets and smartphones. News flashed that even Apple installed a matrix from Samsung in its new iPhone. As we understand, the South Korean manufacturer is inexorably increasing its turnover in terms of the number of matrices per year. However, as you know, an increase in quantity often occurs at the expense of a decrease in quality. As a result, the Internet is full of messages and questions from users about spots on the TV screen or other display device. Often in such messages we are talking about Samsung matrices.
Stains on the TV screen from impact
We will consider in this article not only the spots associated with the reliability and build quality of the matrix. Spots from blows to the matrix in the hearts or accidentally leave for the next tip - replace the matrix. Why? Because the thin structure of the matrix is almost impossible to repair. It is easier and cheaper to make a new display than to restore an old one. Here are examples of spots that appear after hitting .
Spots from hitting the screen most often have clear boundaries and traces of cracks. Over time, blurry contours may appear - these are neighboring pixels that begin to break from heating and internal stresses.
Gray spots on a white background on the matrix
Now let's talk about spots on the screen, which look like blackouts or bright dots on a white background. Here are some photos, dug up on the net, showing these spots on the TV screen in all their glory.
Here, apparently, we are talking about a violation of the flatness of the polarizer or diffuser located in the layers of the matrix. There are also matrix layers on top of each other.
In the next photo you will see the result of installing a defective diffuser or reflector. Moreover, most often such defects do not appear immediately after the purchase of the monitor, and over time, heating causes a violation of the layer geometry.
This is what the matrix structure of an LCD TV looks like.
It can be seen that the matrix is multilayer and has a strict order of the layers and their orientation. So when disassembling and assembling LCD displays, you need to follow the order and orientation of the layers.
Then we see the result of microdust getting between the layers of the matrix. This happens with poor protection of the screen layers around the perimeter. When an LCD monitor or TV is heated and cooled, air moves between the layers of the matrix - a kind of pump is obtained that can suck in such an unpleasant amount of dust in a few months.
To be honest, such flaws in the design of the screens are not surprising. All manufacturers are trying to reduce their costs and reduce the cost of the materials and structures used, which leads to such "childish" display diseases.
I even found a video that also shows heterogeneous spots on the TV screen.
In principle, dust between the matrix layers is possible, but this must be done carefully so as not to make the matrix worse. One awkward movement - a jam or a scratch - is not corrected in any way, but the image will be very visible in the image.Manufacturers recognize defective batches of matrices
Test result: the reason for the identified defect is a defect in the liquid crystal polarization filter.
Conclusion: this drawback arose due to the use of low-quality components by the laptop manufacturer, which do not provide the necessary MTBF resource within the period of its normal operation.
the cost of the examination is 6200 rubles, the period of performance under the contract is 30 calendar days.
A person with this conclusion went to the warranty service with the intention of going to court in case of refusal to guarantee repairs. What ended is unknown.
Liquid stains inside the matrix
It is also worth distinguishing spots from dust and spots from liquid spots inside the matrix. Here is a photo of an example of such a stain after filling a laptop with alcohol.
The main feature in the repair of such matrices is the work with gloves and the absence of dust in the room.
Most often, such spots appear on monitors and TVs of cheap manufacturers and frankly Chinese firms. It is good that such matrix malfunctions can be easily repaired by replacing the LEDs in the backlight with new ones. Sometimes simple contacts help.
Garbage between LCD matrix layers
It happens that at the factory or during transportation, dust particles or other debris appear between the layers inside the matrix.
Somewhere in my archives there was a photo of a fly stuck almost in the middle of the screen - it was a factory defect. In such cases, the monitor successfully surrenders.
This happened with a new TV and this is what Samsung technical support answered, according to the participant:
Here is what Samsung told me:
Hello.
The technical department has considered your appeal and reported the following:
The display case contains ventilation holes to allow heat to escape from the display backlight elements. Through these holes, insects could get inside the display. This is a TV manufacturing technology, like any other manufacturer of equipment, to ensure the outflow of heat from the display backlight elements. The manufacturer is not responsible for insects getting into the equipment.
Here's a way I found from one of the IXBT forum members:
It is necessary to take a soft cloth, such as a scarf or a sweater sleeve, and lightly hit it on the screen, next to a speck of dust. Dust particles are knocked out, and the risk of damage to the monitor is small. Especially stubborn ones, I hit a little harder - this left weak temporary traces on the matrix, which disappeared after a couple of minutes. The result - the screen is clean, the monitor is intact and regularly serves the owner.
And in the same thread of the forum, people also advised tapping on the sides of the monitor - it also helps to bring a speck of dust down when the layers seem to diverge for a moment.
How to get rid of stains on the matrix
So, to summarize and explain how to get rid of stains on the matrix and what cases fall under the guarantee:
- Stains on the TV screen from blows cannot be repaired in any way (the case is not guaranteed);
- If the matrix has flowed, then nothing can be done (if there are no traces of impact, you can try to hand over the warranty);
- When dust gets into the matrix, you can wash the layers of the matrix and dry it without scratching (dust ingress - violation of operating conditions - a non-warranty case, but sometimes people are lucky and change under warranty if a defective batch);
- If the screen is flooded with liquid, then there is a chance to wash the layers yourself (the case is not guaranteed);
- If part of the backlight is out of order
Have you ever noticed strange spots on the screen of your smartphone or tablet? The appearance of any spots or streaks on the screen of the device indicates a malfunction of the display module. Today we will talk about the reasons for their appearance.
Backlight problems
Moisture
Quite often, the penetration of moisture into the device causes a stain. The backlight of LCD displays consists of films, an inverter and lamps. The LEDs shine on the side of the plate, and the films scatter the light, forming a uniform backlight on the screen.
If liquid penetrates between the layers of the film, they stick together. In the place where they touch, the light is refracted at the wrong angle and a spot appears on the screen.
As a rule, it has an irregular shape and is characterized by increased brightness. At different angles of inclination, the spot will change its shape or not be noticeable at all.
If your device has an AMOLED display, then you have no reason to worry. Such screens have a different backlight structure technology. If a small amount of liquid gets inside the device, the stain will not appear.
If you have problems with the backlight of your iPhone, you can replace it. You can buy a new backlight for the display.
Manufacturing defects
Stain due to manufacturing defect occurs during the assembly of the display and very often looks like a stain caused by moisture. The manufacturer may choose the wrong length of the screws, because of which they rest against the back of the display and lead to compression of the films between themselves.
Such a spot has an oval shape and does not change it at different angles of inclination. By the same principle, spots are formed from the ingress of third-party objects, such as sand.
It occurs in devices in which the manufacturer did not make the correct heat sink. In a place where the device overheats, the films are deformed from constant exposure to high temperatures. After the smartphone or tablet cools down, they no longer take their original shape and a stain forms at the place of overheating. Most often, overheating spots occur at the ends of the display and have a yellow tint. Such a spot is darker in the middle and brightens closer to the edges.
Heat spots do not change shape at different viewing angles and may become more pronounced over time.
LED backlight failure
LED backlight problems most often manifested by the appearance of a local black spot or a deterioration in the backlight as a whole. The spot is formed in the place where the LEDs fail.
Backlight repair- a rather laborious process and takes a lot of time. If the backlight is broken in a smartphone or tablet, it is recommended to replace the display module.
Display problems
After a fall or impact, the image disappeared on some part of the screen - this is a sign of a broken display. A spot of this origin most often has an irregular shape, cracks may radiate from it, and if you press on it, its size may increase, and the shape may also change.
With the help of this microcircuit, which is located on the cable, image transfer to the display is controlled. The controller breaks from mechanical impact, that is, from a strong fall or impact. Liquid can also damage it.
If the controller is damaged, the image may disappear altogether: the screen becomes completely white or black. But most often, when the controller breaks, multi-colored vertical stripes appear. If you press on the screen, the stripe configuration will change.
It happens that the image can disappear only in one place on the display. Such a spot will have clear boundaries, and the rest of the screen will display a normal picture.
Note! If the backlight disappears both on the screen and on the buttons, the problem is most likely with the board.
If a small dot of red, blue or green color appears on a plain black or white background of the screen, it means that dead pixels have appeared.
Dead pixel- This is a separate element that loses the ability to change its color.
Often, manufacturers indicate the quality class of monitors, guided by the allowable number of dead pixels.
There are 4 classes in total:
Ⅰ - there are practically no dead pixels. In the event of a broken pixel, the manufacturer undertakes to repair under the terms of the warranty or replace the display;
Ⅱ - 2 defective pixels (white or black) are allowed;
Ⅲ - 5 white, 15 black and 50 color dead pixels are allowed;
Ⅳ - 50 white, 150 black and up to 500 color dead pixels are allowed.
It should be noted that the quality class of the display directly proportionally affects the price of the spare part. The higher the quality, the more expensive the display costs.
Today touch screen sticking problem mainly occurs in budget smartphones.
In low-cost models, there is an air gap between the display and the sensor. When the space between the display and the sensor shrinks, they can stick together and stay that way for a long time.
The glue stain can be easily recognized. It is noticeable when the display is off and may partially disappear when the backlight is on. It looks like a liquid squeezed between glasses. Faced with such a problem, users often think that water has entered the device. It is possible to eliminate such a stain, but for this it is necessary to re-glue the touch screen.
Module delamination
Delamination in the display module is a type of defect that refers to a factory defect. A poorly glued sensor during the manufacture of the module begins to lag behind the display around the perimeter over time. As a result, white spots appear. Such a defect is extremely rare. In this case, the display must be replaced under warranty.
If any stain appears on the screen of your device, contact a specialized service center. It is almost impossible to replace or repair damage to the backlight or display module at home. For repairs, it is necessary to use special equipment and have certain skills in repairing equipment.
If you know which particular part needs to be replaced, you can purchase it from our website. To find the right spare part or find a replacement for it, we recommend reading ours.
Why do spots appear on the TV? There are several reasons. We will consider each of them in detail, and then we will analyze the proven ways to eliminate such defects. To avoid the appearance of blackouts, black and colored spots, stripes, follow the operating conditions of the equipment.
Many users do not pay due attention to the care of the LCD screen. You should clean your TV display at least a few times a month. Such a preventive measure will avoid the appearance of various defects.
You have to be selective when it comes to cleaning products. For example, do not use cosmetic wet wipes, alcohol-based products that are not designed for LCD screen care. Now let's move on to the main causes of spots on the display.
Manufacturing defects
If the screen works, but at the same time a bright glow appears, then this is the first sign indicating a manufacturing defect. The matrix is wrong. If the TV is still under warranty, it is better to exchange it. Because repairs are too expensive.
The defect does not appear immediately. A bright glow occurs after repeated heating. The specificity of the breakdown is that the geometry of the matrix layers is broken. The cause of the malfunction was the incorrect installation of the diffuser and reflector.
If a dark spot appears on the screen, then this can also indicate a manufacturing defect. At first, the defect appears as small dots. Such a symptom indicates non-compliance with the screen installation technology in production.
Small white spots on the TV screen gradually darken and increase in size over time. Contact the service center so that the masters can repair the faulty device or change the damaged matrix.
What should I do if the warranty has expired? If you use a TV from a famous brand: Samsung, Sony, LG, then it is possible that the company wants to maintain its reputation and will meet you halfway. However, such a scenario is possible only if there was no mechanical damage to the TV and the rules for caring for equipment were observed.
Separately, it is worth talking about the availability of software for recovering dead pixels. However, the use of special software will be justified only if the subpixels are not damaged.
Dust and small debris
White spots on an LCD TV screen are caused by the penetration of dust particles into the matrix layers. This also indicates a non-compliance with the geometry of the layers. Regular temperature fluctuations (the TV constantly heats up and then cools down) lead to the movement of the layers. Because of this, dust and other small debris enter the matrix layers. After 2-3 months, black dots or a large black spot may appear.
Experts strongly recommend wiping the liquid crystal display in a timely manner. It is not necessary to use special wet wipes or special sprays. Blowing is the best way to remove dust. This eliminates the possibility of damage to the matrix.
Not only dust can get stuck between the layers of the matrix. It is possible that there will be larger particles. There are cases when insects get stuck between the layers. However, this is rather an exception, indicating a factory marriage.
Large dust particles and other contaminants are removed as follows:
- Take a dry and soft cloth.
- Lightly tap on the display.
- The dust particles will gradually fall off.
Why can't you just wipe the screen? Firstly, divorces may appear, which are extremely difficult to get rid of in the future. Secondly, if the geometry of the layers is really broken, then wiping will only exacerbate the problem.
To prevent dust from getting stuck between the layers of the LED TV, you need to lightly tap on the center of the display. Tapping around the edges can exacerbate the problem.
Stained by impact
Dark spots on the TV are traces of mechanical damage. Such defects appear if the TV device has fallen or the display has been hit, a strong mechanical impact. The spots have very clear contours.
The internal heating of the TV aggravates the breakdown. Because neighboring pixels are also damaged. It is impossible to repair the display of a Samsung or LG TV, contact the service center so that the masters change the matrix. However, this is also a financially costly procedure.
If dark spots appear on the screen of a plasma or LCD TV, caused by mechanical damage, it is more rational to buy new equipment. Repair will cost about 50% of the face value of the TV.
Liquid stains
It is extremely easy to distinguish a spot on a TV screen caused by the ingress of a copious amount of liquid from a darkening due to dust. Defects appear if alcohol, tea, coffee, juice or the most ordinary water gets on the display.
What should I do if such spots appear on the display? Wash the screen with boiled water (room temperature) or purified alcohol.
Spots that appeared due to liquid are eliminated in a room without dust and drafts. Be sure to rinse the display while wearing gloves so as not to aggravate the damage.
Dark semicircular spots around the edges
A dark spot on the LCD TV screen indicates a breakdown of the LED backlight elements. This is local dimming. Defects of this type appear in the corner of the screen. The malfunction is eliminated by replacing the burned-out LED.
If the TV has not been disassembled before, and the warranty period has not expired, then the replacement of defective LED backlight elements will be free of charge.
How to get rid of stains
The main ways to care for the liquid crystal screen have been discussed earlier. We have proposed several effective methods aimed at correcting specific defects. There are other tricks to remove stains that we will share with you:
- If the stain appeared as a result of mechanical damage, then it will not be possible to eliminate it. The only way out is to replace damaged components.
- A leaky matrix is another sign that it will not be possible to restore the hardware module. If the warranty has not ended, then the repair of the TV will be free of charge.
- What to do if dust has already seeped between the layers of the matrix, and ordinary tapping on the screen does not work? Buy a special microfiber cloth for LCD displays and also get a screen cleaning spray. Spray the aerosol onto a cloth, and then wipe the TV.
- If the TV was flooded with liquid, then you should not hope for warranty repairs. However, you can wash the screen yourself. Mix vinegar, boiled water and purified alcohol, and then wipe the display using a soft dry cloth (preferably microfiber).
- You can blow through the layers of the matrix using household appliances. Many vacuum cleaners are equipped with nozzles suitable for this procedure. The main thing is not to bring the nozzle too close to the screen. Blowing is carried out at a distance.
Now you know how to remove the spots that appear on the screen yourself. It is far from always possible to solve the problem using improvised means. For example, if the defect appeared due to mechanical damage or the LED backlight burned out, then seek help from specialists.
Note.
If spots appear on the monitor, this is a consequence of a serious breakdown of your device. Variants of its manifestation can be different:
- round black, dark or gray spots randomly scattered across the screen;
- oblong spots in the form of smudges and blur;
- red, yellow or other colored spots (on the screen or on its sides);
- light areas in the form of longitudinal or transverse stripes, on which the image is doubled or blurry.
Why do spots appear on the monitor screen?
There are two main causes of spots:
1. Mechanical damage
These include shocks during careless transportation, strong pressure on the screen surface with a hand, careless use of chemicals to clean the screen, water ingress, etc.
2. Matrix malfunction
Most often, the matrix and components associated with it fail. For this reason, areas of dead pixels appear. Almost always, such a problem is solved only by replacing the matrix.
What do the different colors of the spots mean?
Yellow spots on the monitor
This usually indicates a split screen. The design of a modern monitor is a combination of thin layers, between which a special adhesive is contained. Violation of the integrity of the layers in this case manifests itself in the form of yellowish spots. It is also possible to get inside a foreign liquid, most often water.
Red or colored spots on the monitor
Blurry patches of red or purple tint can indicate magnetization of the monitor, especially after a sudden power surge or thunderstorm. You can try to solve this problem by disconnecting the device from the mains for half an hour or an hour. In this case, you can hear the moment of degaussing in the form of a characteristic click inside the monitor.
However, most often the cause of such image defects is the breakdown of the power supply or the failure of the matrix.
Black, dark or gray spot on the monitor screen
If a black spot (or several) appears on the monitor, this almost always indicates the failure of the pixels of the matrix, which cannot be restored. This is eliminated either by replacing the screen, or by purchasing a new monitor.
Light or white spots on the monitor
It happens that light spots with uneven edges appear on the monitor screen. Sometimes they are clearly visible, sometimes you need to look closely to notice them. The reason for such highlights is a malfunction of some components of the matrix backlight: an inverter, lamps or other elements.
How to remove spots on the monitor?
In rare cases, you can try to eliminate the bright areas that distort the image using the monitor settings, but the likelihood that this will help is extremely small. In other cases, repairs are required. In this case, it often happens that replacing the matrix is completely unprofitable, and in this case it is more profitable to buy a new monitor.
