Replacing the matrix on a TV with your own hands: disassembly, repair, assembly

In modern television receivers, both liquid crystal and plasma, special matrices are used as a screen, in which liquid crystals or inert gas are used to display the picture. They appeared thanks to innovative digital technologies that are actively being introduced into production by well-known companies that mass produce televisions, personal and tablet computers, and other gadgets. Currently, products that use various types of matrices as screens have practically replaced models with cathode ray tubes (CRT) from the market. But, like any electronics, this equipment also fails due to external factors (for example, mechanical damage) or internal failures (for example, a cable). In this case, you will need to replace the matrix on the TV. Moreover, this process does not depend on the size of the screen diagonal (32 inches, 40, 42 or another), but on the design features of the device.

Types of matrices and their design

In the general case, the matrix is a “sandwich” in which many tiny segments (pixels) are placed between two absolutely clean glasses (substrates), each of which is controlled by a separate driver - a microcircuit located on a flexible cable soldered into the substrate . That is why a certain image is formed on the screen. Structurally, the matrices of plasma panels and LCD TVs are arranged differently.

Plasma panel

The matrix of a plasma TV is a set of glass cells measuring 0.5x0.5 mm, filled with an inert gas (xenon, neon, etc.) with a small addition of mercury. The outside of the cells is coated with phosphor - a substance that can glow under the influence of ultraviolet rays. When high-frequency voltage is applied to the electrodes, the gas is ionized and converted into plasma (4th state of aggregation). In this case, a capacitive high-frequency discharge occurs in the plasma, causing ultraviolet radiation, under the influence of which the phosphor of the desired color begins to glow.

On a note! The process is controlled by the internal electronics of the matrix, and the screen is updated at a frequency of 400 to 600 Hz, which is much faster than in a CRT.

The main disadvantages of a plasma matrix are burnout and afterglow of cells.

Burn-in is a defect that occurs when there are image fragments that do not change on the screen for a long time (TV company logo, etc.). In this case, the luminous cells overheat, the phosphor from their surface evaporates, and a fragment is fixed on the screen that does not disappear when another image is formed.
Afterglow is a phenomenon in which some of the cells can glow both after changing the image and after turning off the TV. This happens due to the fact that an electric charge accumulates in cells that glow with bright light for a long time.

LCD matrix

The operating principle of the LCD matrix is based on the use of the anisotropy of a unique substance - cyanophenyl.

On a note! Cyanophenyl is a liquid substance, the molecules of which fully possess the optical properties usually inherent in crystalline bodies, and, in addition, are able to take the shape of a vessel. This is where the name “liquid crystals” came from.

The formation of a picture on the LCD TV screen is carried out due to the polarization properties of liquid crystal (LC) molecules, which play the role of light filters that transmit only one of the primary colors. Polarization is controlled using an electromagnetic field, under the influence of which the LCs change their shape and location. At the same time, the angles of light refraction of the crystals change, as a result of which their polarization changes and an image is formed.

Structurally, the LCD matrix is an array of pixels, each of which is controlled by internal electronics. The light source can be reflected light or passing directly through the crystals. The design also includes polarizing filters (additional panels) that control the intensity of the LCD glow. In this case, the amount of transmitted light depends on the angle between the polarizer axis (main panels) and the plane of polarization (additional panels).

When to contact specialists

In some cases, it is not possible to repair or replace TV components yourself. The optimal solution to the problem in such situations is to seek professional help from official service centers and private workshops. It is recommended to use the services of specialists if:

the screen is severely damaged and the internal components of the device are affected;
there is no practical experience in repairs and confidence in the correct execution of repairs;
replacement requires rare parts that cannot be found in electronics stores on your own;
A repair attempt was made, but it was not possible to restore the display.

Repairing a TV in service centers will cost more than fixing it yourself, but turning to specialists has several advantages.

The main advantage is the high probability of successful repair and preliminary performance of complex diagnostics using specialized equipment. Another advantage of professional repair is the quick selection of the necessary components and prompt repairs with a quality guarantee.

This is interesting: The machine knocks out when you turn on the washing machine: causes of malfunction, expert advice

Signs and causes of failure

Despite the high reliability of the matrix, it can also fail (like any other component of the TV). Among the reasons leading to its breakdown, the most common are:

mechanical impacts resulting in damaged or broken screen;
failure of drivers responsible for image formation;
damage to the flexible cable.

Repairing a failed matrix is usually impossible. It is possible to restore its functionality only in the case when the defect is associated with a malfunction of the backlight elements of LCD screens - fluorescent lamps (LCD) or LEDs . Such defects are characterized by a complete absence of an image. In some models of LCD TVs (Thompson, Sharp, etc.), these elements can be replaced. At the same time, for different types of television receivers (Dexp, Akai, Supra, Daewoo, etc.), the methods for replacing lamps may differ - in some cases it is necessary to dismantle the matrix, and sometimes you can do without it.

LED

Note! LCD TVs from Toshiba, Philips and some other brands have multiple light sources, so when repairing, you need to check each of them separately.

The fact that the matrix has failed can be determined not only by the complete or partial absence of an image, but also by:

colored vertical floors instead of video images;
black circles;
stains and drips;
thin horizontal lines;
dark and light points that do not disappear anywhere.

Can it be repaired?

LCD TVs have become widespread and are installed in many apartments. The popularity of the devices is due to the high-quality images that are suitable for viewing modern content. When wondering whether an LCD display can be repaired, you need to conduct diagnostics and understand the nuances of the TV’s operation.

The main component of the screen is a matrix containing a large number of particles filled with a mixture of xenon and neon. Semiconductors are located along the perimeter of the matrix. During operation of the device, electricity passes through the gaseous medium and produces ultraviolet light, which illuminates the phosphors. Due to this process, individual cells are highlighted in different colors.

All display components are located in a compact space between the planes, which are made from a special type of glass.

When diagnosing a TV screen, you need to determine the type of damage. The most common breakdowns are the following:

the formation of severe defects provoked by external mechanical influence;
disruption of the transmitted image due to liquid ingress;
the occurrence of scratches and microcracks on the surface of the display.

If the screen is severely damaged and the integrity of the matrix is compromised, the gas mixture will begin to escape, and it will be impossible to repair the device. The only way out in this situation is to purchase and replace the matrix. Since the cost of a new matrix is high and comparable to prices for televisions, you should immediately consider purchasing a new device.

Small scratches that do not affect the condition of the matrix can be eliminated yourself. To do this, wipe the surface with a weakly concentrated solution of ethyl alcohol or a special product intended for liquid crystal monitors.

Replacing the matrix at home

Replacing the matrix on a TV is a fairly expensive operation, which should preferably be carried out in a specialized workshop.

On a note! Some workshops offer owners to replace a faulty TV with a new one, purchasing the faulty one for a small fee. At the same time, the price of the new model is reduced by the redemption amount.

If the owner of a television receiver decides to repair it with his own hands, then he must take into account that each TV model uses an original matrix. In each specific case, it must be ordered individually, since there are practically no matrices available for free sale. At the same time, they do not cost much less than a new TV. Replacing the matrix itself is a simple procedure, but it requires:

skills of careful handling of fragile objects;
experience in assembly and installation work and setting up household radio-electronic equipment.

Removing the matrix from the rear cover

Dismantling of the faulty matrix is carried out after opening the housing of the television receiver. In this case, access to it can be opened both from the back cover and from the screen (Samsung, Sony Bravia). Before you begin work on replacing the matrix, you must:

purchase a new matrix;
prepare the workplace by covering it with soft material (flannel, felt, blanket, etc.);
collect tools and materials that may be needed during the work (various screwdrivers, tweezers, thin metal plate, alcohol, napkins, etc.).

To access the matrix from the back of the TV, you need to place it with the screen on a soft surface and unscrew all the fastening screws holding the back cover.

Attention! The rear panel can be secured with screws of different lengths. Therefore, you need to remember where exactly this or that screw is located.

After unscrewing all the screws, you need to carefully lift the back cover and carefully disconnect all the components that are located on it. You should be aware that in the design of some TVs (for example, LG), the back panel is equipped with a special hatch that allows access to elements during service, and therefore, when removing the cover, special care must be taken so as not to damage the cables going to it .

By removing the back cover, the owner gains access to the matrix, on the body of which all the electronic components are installed. Having carefully disconnected all the cables going to these modules, you can begin replacing the matrix

Removal from the screen side

To dismantle the matrix from the front side, you need to place the TV with the screen facing up and release all the latches that hold the panel facing in place. This must be done carefully so as not to break the latches. It is best to use a pre-prepared thin metal plate for this purpose. By removing the panel lining, we gain access to the matrix, which is screwed to the back cover of the TV.

On a note! In some cases, the mounting screws are duplicated with latches.

Next, you need to unscrew all the fasteners that are on the back wall of the TV, which blocks access to its electronic components. Then you need to disconnect all the cables that connect the matrix to the printed circuit boards located on its body.

Replacing the matrix

If all the above operations are performed correctly, then you can proceed with the replacement. Having placed a working matrix next to it, carefully transfer to it all the electronic components present on the faulty element. In this case, it is necessary to immediately connect the corresponding cables to them. Then, after wiping the edges of the matrix with a damp cloth soaked in alcohol, install it in place, secure it with standard fasteners, and then carefully connect the signal cable and power supply.

Advice! To make sure that the assembly and installation work was performed correctly, you need to turn on the TV - the screen should light up evenly.

Having made sure that there are no defects, we begin the final assembly of the television receiver housing. It is carried out in the reverse order of disassembly. The process of replacing the matrix ends with checking the functionality of the television receiver. Quite often, when you turn on a television panel with a new matrix, there is no image on the screen, which is due to its inconsistency with the control module. To eliminate this drawback, you need to configure the TV. The procedure for this is described in the service documentation included with the delivery of the television panel.

Cracks on the display

Is it possible to replace the display if cracks appear on it? The fact is that cracks violate the very integrity of the matrix, and a mixture of gases leaks from the container under the glass. This kind of problem cannot be repaired; you just have to buy and install a new matrix.

Many people prefer to buy a new TV, since the cost of the matrix is equivalent to a new device.

It is easier to purchase a new plasma panel if it is a home theater component and does not have audio output devices. Here you just need to replace the broken panel with a new one. If a large multifunctional plasma TV is broken, you should think about repairs. Before choosing a new model, consult with sellers about the quality and place of assembly of the device - operation depends on this.

Prevention

If the malfunction of the television receiver matrix is not associated with a manufacturing defect or natural wear of parts, then in some cases this problem can be prevented.

Equipment should be protected from mechanical impact: shocks, falls, and so on. It must be remembered that the screen is highly fragile.
It is necessary to exclude any exposure to moisture, since it destroys the electrodes, breaks the contacts and, as a result, causes problems with the image.
It is recommended to connect the television receiver to the mains through a stabilizer. This way you can avoid malfunctions of the chips that form the video image and the cable, which in some cases can be caused by frequent voltage surges, lightning strikes and similar electrical phenomena.

Advice! To further prevent damage to the matrix, it is advisable to additionally purchase a protective transparent screen. This is especially true for owners of plasma panels.

So, damage to the matrix is a very unpleasant event. Replacing it in a workshop is an expensive repair job, but it is still recommended to entrust this process to professionals. However, you can change a failed element yourself at home, but only if you have skills in fine electrical work.

How to diagnose faults?

Before you start repairing your TV, you need to make sure that there really is a problem. Diagnostics will help determine the malfunction , which you can perform yourself and do not waste money on calling a technician.

There are several types of TV screen breakdowns. Among the most common are the following.

The equipment stops turning on. This type of breakdown is associated with a blown fuse, so it makes no difference whether a CRT TV or a modern LCD device does not turn on. The only difference is the structural elements that will need to be changed. A fairly common cause of element failure can also be failure of the diode bridge.
A potential failure has occurred . A similar breakdown occurs in both domestic and foreign models. The reason lies in the incorrect operation of the posistor, which is responsible for supplying potential.
The plasma TV monitor stopped working. The problem should be looked for inside the design of the device, in the parts and circuits that are responsible for transmitting the image to the display. It’s easy to detect a breakdown: dark or light stripes appear on the screen, and the color of the picture changes during viewing.

Another common reason for screen failure is a broken cord or a faulty socket.

It is difficult to restore the operation of the TV display, but if you wish and have the necessary tools, you can cope with the problem yourself . In this case, it will be possible to correct not only the main symptoms, but also improve the quality of the picture.

This is interesting: The multicooker does not turn on: reasons and what to do?

Expert advice

If there are vertical thin stripes, it is worth checking not only the matrix, but also the video amplifier and color block;
Lamps in the matrix may burn out due to power surges. They are being replaced;
Matrix repair makes sense only if the price of a new TV is higher than the part;
The body of the equipment is assembled in the opposite direction;
Some cables can only be removed by lifting the clamping bar;
If the TV's warranty is still valid, but the matrix is broken, take it to a service center for repair.

Watch a video on how to dismantle the matrix of a large diagonal TV

What does the screen consist of?

The main component is the matrix. It contains a huge number of particles that are filled with xenon and neon. The matrix is framed around the perimeter with semiconductors. Phosphors begin to glow when UV is created - a glow created by an electric current that passes through a gas medium. This process causes the cell to glow in the desired color. Together, tens of hundreds of cells create the image that the TV shows.

What to do with a cracked TV screen? please advise!

The entire screen structure is located in a small space between two planes, which are made of durable glass. To understand whether the LCD screen is broken, you need to understand how the breakdown occurred.

Damage to the cable and glass leads to the need to completely change the matrix.

Disassembling a TV with a front housing system

The principle of replacing the matrix depends on the TV model, manufacturer, and the size of the matrix. However, there are general rules. There are two popular types of housing fastening - screw connections and plastic latches.

The front panel of the cladding must be pressed out and the latches removed. Then you will see the matrix screwed to the main body of the TV using metal screws or screws. You need to unscrew each fastener and separate it. Be careful - the screws may be doubled with latches. It will also be necessary to dismantle the bolts on the back wall of the TV; they secure the case with a metal screen that provides protection against malfunctions of the power supply and control board.

When everything is done as needed, the matrix with all the electronics should be separated from the body. To prevent chips and scratches, it is recommended to place the element on a soft fabric; flannel is perfect for this. Next, disconnect the panel from the connecting cable, be extremely careful. In some situations, for additional fastening, as well as protection against movement of the cable, the manufacturer glues strips of adhesive tape to the connection.

Carefully remove it, lift the clamp - pawl located on the connector, you can use small tweezers for this. To avoid damaging narrow paths, you must try to remove the cable without swinging it in different directions. Then you need to remove the stiffening panel from the matrix. For this purpose, we unscrew the screws from the ends; different manufacturers may have 2–12 pieces on one side.

Damage warning

It is impossible to argue that prevention is the best defense. Manufacturers have already created many methods of protection. One of them is an acrylic screen protector. Its advantage is that, unlike TV screens themselves, they can be exposed to water, scratches or even light impacts.

Important! This type of screen will help protect the original panel from mechanical damage, which is extremely important, as well as from dirt and dust, which is considered the enemy of nanotechnology.

So, if you want to protect your plasma TV from damage, and even more so if the cost of the equipment is quite high, we recommend purchasing this protection option. An acrylic protective screen is very useful and necessary in a house with children, because one careless movement can lead to large losses.

Important! If the resume of the technicians from the service center is unambiguous - the panel cannot be repaired, you will have to buy a new TV. Our reviews will help you choose a high-quality model and place it correctly in the room:

OUR SITE RECOMMENDS:

Graph of the function fractional part of a number
15.12.20190
Studying 10th grade algebra using the textbook by A.G. Mordkovich and ...
View of the earth from space with hyper zoom
15.12.20190
World map from satellite. Explore the satellite map of the world...
Where to find a screenshot on your computer
15.12.20190
Contents1 Using the “Print Screen” key2 When using...
Libraries for Proteus 8
15.12.20190
Probably, if you have just started studying microcontrollers, you...

The last notes

How to recover Instagram page without email
15.12.2019 0
How to restore a VK page without a last name
15.12.2019 0
How to restore a VK page if the number is lost
15.12.2019 0
How to restore a column in Excel
15.12.2019 0