Repair and replacement of matrices (screens) of TVs

DIY TV repair photo

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Can the TV fall off the bracket. The idea of how you can hang an LCD TV without a bracket ...

Hello everyone! I had a need to hang the TV on the wall, my daughter grows up, becomes inquisitive, often comes up to the TV, and just look, she will overturn the TV on herself or even break it. At first I wanted to buy a bracket, I went and looked closely, but to be honest, the prices were unsatisfactory for something, since there is no extra money anyway. I thought for a long time, I was looking for some piece of iron, similar to a bracket, I wanted to do without finances. Then I got an idea, what if I hang the TV on a chain. I'm an economic guy, I bring everything into the house, of course, only what can be useful for the house. I also found a suitable chain. I figured out the dimensions. The chain is about 42 cm long.I calculated the two central links of the chain, I inserted a 6 × 80 mm screw into them,

I put the washer for reliability, the hexagon turned out to be a little too small

I drilled it at a slight angle into the wall, I was left hanging evenly, two end links from the chain, I already screwed the TV to them, in places with holes for the bracket. There are four holes, you need to screw two holes in the top.

I put a screw in two center links ...

And this is how it looks already in limbo ...

What is an LCD matrix and its malfunctions

Liquid crystals - what are they? This is the name of the phase into which a substance passes under certain conditions. The electric field can change the orientation of the LC molecules. It is this property that contributed to the widespread use of liquid crystals in the industrial field. Liquid crystals were discovered in 1888 by Friedrich Reinitzer.

However, the use of LCDs was found only in the 60s of the last century. American scientists have proposed using liquid crystals as a matrix element in information display devices. Under the influence of voltage, the LC molecules are ordered and form the required image.

That the Matrix is a system of conductors of electricity. It consists of thin and transparent electrodes located vertically and horizontally parallel to each other. The electrodes form a square-nested network that supplies voltage to the substance contained in the device. Repair of the TV matrix may be required if, under the influence of voltage, structural elements gradually fail.

Modern LCDs are backlit monitors, and the matrix cells have color filters. When the backlight fails, you can replace the damaged diodes.

What are the malfunctions of the LCD matrix:

Physical damage or exposure to moisture. As a result, an electrical breakdown of the matrix occurs. The image shifts and freezes. Water that gets inside forms black circles. As a result of corrosion, multi-colored can appear. Replacing the screen with a new one in this case is required.
Discharge defect. Formation of granular goosebumps.
Illumination lamps deteriorated. Looks like a spotty blackout on the screen.
Incorrect fastening. Panel sagging due to the TV's own weight.
Malfunction of microcircuits.
The loop with the control drivers is damaged.
Backlight malfunction.

Can it be repaired

LCD TVs are 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. Asking the question of whether it is possible to repair the LCD display, you need to carry out diagnostics and understand the nuances of the TV.

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 placed along the perimeter of the matrix. During operation of the device, electricity passes through the gaseous medium and forms ultraviolet light, illuminating the phosphors. Through this process, individual cells are highlighted in different colors.

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

the formation of strong defects, provoked by external mechanical stress;
violation of the transmitted image due to liquid ingress;
scratches and microcracks on the display surface.

If the screen is badly damaged and the integrity of the matrix is violated, 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 the prices for TVs, it is worth immediately considering the option of buying a new device.

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

Installing the TV on the wall. What about the bracket?

It is possible to fix the TV on the wall immovably from the point of view of ergonomics only in some cases. Although modern flat-panel TVs typically have a full view area of at least 120 degrees horizontally and 60 degrees vertically, health requirements for extended viewing impose additional restrictions: up to +/– 30 degrees from the horizontal axis perpendicular to the center of the screen; tilt of the screen plane vertically up to +5 (up) and –15 (down) degrees. If long-term viewing is possible while sitting and lying (studio apartment or small-sized one with a living room-bedroom), the vertical inclination is admissible at +/– 15 degrees. That is, the system for attaching the TV to the wall must ensure its rotation / tilt within certain limits so that the viewers' eyes are in the indicated areas, and best of all, directly against the center of the screen.

Note: in what cases and how to mount the TV on the wall it is possible tightly / motionlessly, will be discussed below.

The prices for TV holders do not seem to bite very much: a good one for a diagonal of up to 30 ”can be purchased for 2000-3000 rubles. , and one that can withstand it on a solid capital wall - less than 1000. But if the TV is credit, then this amount can also matter.Hence the third question: is it possible to make a TV mount on the wall with your own hands? There seems to be nothing complicated in store products; for pivoting hinges, small garage hinges (say, 10x120) or detachable door hinges with a ball bearing will fit. Well, let's see about work.

If we discard the purely “goblin (troll)” ones, then it is still clear: there are more than enough well-grounded questions and comments on the quality of the work and the course of its execution. Although, it would seem, what kind of skill is needed here, to drill holes in the wall, drive dowels into them and put a piece of iron specially designed for this on self-tapping screws?

Or vice versa, the TV must be rotated 80-90 degrees for viewing in the sleeping area. But then the usual "breaking" bracket will need such that when viewed in the living area, its hinge will stick out from the side and make the entire interior design laugh. And for hanging on a special bracket, just for such cases (see below), an ordinary TV is not suitable.

On the other hand, in 2 parts of another plot, it is shown how to independently make a bracket for a TV.

The finished product turned out to be quite solid, but only with the 1st degree of freedom (see below), which is far from always acceptable. The work is not easy, and the savings are not more than 3000 rubles. at its best.

Based on these conditions, you can give the following recommendations regarding the purchase or self-manufacture of a TV bracket:

First of all, it is necessary, according to the requirements of medical sanitation, ergonomics and interior design (in this order), to find a place on the walls for a TV with satisfactory bearing properties of the supporting surface: with a TV weight of 10 kg, each of the 4 points of its attachment to the wall will have to not less than 20 kgf; the leverage rule applies here.
Then choose a suitable mounting structure.
If it is possible to use welding equipment, access to metal-cutting machines, appropriate working skills and a certain supply of suitable scrap metal (steel pipe from 25x15x1 and sheet from 1.5 mm), then you can make a TV bracket with your own hands. The money saved will be enough to celebrate the successful completion of the work.
Otherwise, search the Internet for a product that suits your requirements. The choice is immense, but how to choose a TV mount with knowledge of the matter and make its installation with your own hands, this is all the subsequent material of the article.

Common breakdowns of popular brands of LCD TVs and how to fix them

Each manufacturer has its own weak points, so below is a selection of the most common LCD screen breakdowns.

Philips TV repair

Often, users of this brand are faced with such a problem that when turned on, the device beeps without interruption. This symptom usually indicates that a leak has occurred. It is recommended to try replacing the pre-output stage diode.

Another common problem is turning the monitor on and off on its own. The main reason for this breakdown is hors de combat transistor, it must be replaced. It is recommended that such malfunctions be eliminated on their own only by people who have experience in repairing television equipment.

If the breakdown is complex, then it is better to entrust its elimination to specialists who will not only professionally perform repairs, but also issue a guarantee. Therefore, if the repaired screen stops working again, the user may demand a refund.

LG TV repair

LG flat screen owners may have a problem saving settings. Such a problem does not require contacting the masters, you can repair the LG TV yourself. It is enough to switch the device to another operating mode, and all settings will be saved.

As well as in the case of other LCD models, if the problem is serious, then it is not recommended to repair an LG TV with your own hands, it is better to contact a specialist.

TV screen replacement instructions

The procedure for replacing the TV screen depends on which model needs to be repaired. Differences can be in the order of disassembling the structure and the method of installing a new part - a matrix, accessories or a whole screen.

Most models have latches or screws as fasteners, so removing the TV cover is easy. Disassembly of the structure is carried out from either side.

Frontal. In this case, it is necessary to squeeze out the latches, which are responsible for fastening the cladding of the television panel. This is the only way to gain access to the matrix and other screen components that may need to be replaced. To dismantle the matrix, it is necessary to unscrew the fastening screws - they are located on the rear wall of the structure. Then all that remains is to replace the element or part and reassemble the TV.

The procedure itself for replacing the screen matrix in the event of a breakdown is not difficult.

It is important to follow the procedure and pay attention to the following steps

When the case is disassembled, access to the matrix will appear. It will be possible to see that electronic boards and loops are fixed on it, which are responsible for sending a signal to the device's screen. These components must be disconnected and dismantled, having previously photographed or noted their location.
Loops should be disconnected along the perimeter of the device. It should be noted that in some models the cables are hidden under the frame, which must also be taken into account.
After removing the matrix, it must be placed next to a working element, to which modules and electronic boards should be gradually transferred. As soon as the board is transferred, a loop can be connected to the new matrix.

The new matrix is installed in place of the broken one, then the TV case is assembled and the display is checked for operability.

To do this, you will have to visit a specialized store and buy consumables, having previously specified the equipment model.

In order for the TV to work correctly and last a long time, it is necessary to coordinate the new matrix with the installed modules. The procedure is carried out with the device turned on. For approval you will need:

go to settings;
run the corresponding function;
follow the rules for connecting drivers.

It should be noted that depending on the TV model, the set and sequence of actions may be different, therefore it is recommended to read the instruction manual.

In this case, it is recommended to seek professional help.

Next, watch the video with a master class on repairing a TV screen.

Verification methods

Experts practice express methods for assessing the performance of the console, which allow them to assess the scale of the malfunction. Previously, a radio tuned to the FM band was used for this. When the buttons on the remote control were pressed, a sound was heard in the speaker. In modern conditions, a mobile phone acts as a tester. They also use a multimeter (who knows how).

By mobile

We carry out diagnostics in stages:

Enable camera mode on your phone.
Point the remote at the mobile by pressing any button.

A colored dot should appear on the display - a sign of the operating board of the console. This limits the troubleshooting field. Most likely, the problem is in the keyboard, and it is easier to restore it than soldering, replacing elements.

Tester or multimeter

A multifunctional household voltamperometer, also known as a tester, allows you to check the presence of current in the batteries, the voltage supply to the board. But for this you need to have a minimum of skills in working with the device.

First, the required mode, voltage (U) is set with a multi-position switch.Then the probes touch the contacts of the battery. The display should be about one and a half volts - this is the normal operating voltage of a good battery. At the same time, you can check the magnitude of the current: the tester is switched to the current measurement mode (I), at each element, a value from 250 to 500 milliamperes is considered to be working.

To evaluate the board's performance (voltage presence at test points), you need to know what to measure where. In Bravia models these are some points, in Samsung - others. And before such deep testing, the remote control must be disassembled.

CRT screens

Despite the fact that today the majority of consumers prefer the most modern plasmas, CRT screens are still in demand. These TVs have their advantages: they are inexpensive, easy to operate, and the quality of the transmitted picture is still high.

The main problems with CRT devices:

the CRT TV does not turn on - just like on devices of a different type, first of all, you need to check the integrity of the fuses;
a diode bridge malfunction is a common problem with CRT receivers, the TV can be repaired only after making a "ringing", from the equipment you will need a multimeter;
breakage of the posistor is considered the most serious problem; in order to check, it is necessary to turn off the TV's power circuit, then start it again. After, observe the lamp, if it goes out, it means that the posistor is out of order. First of all, you need to adjust the resistance of the network, and then replace the part;
burnout of a transistor or capacitor - such a malfunction is easy to replace with a visual check (for black carbon parts), repair is carried out by replacing the part.

Rear access

To repair the TV matrix from the back side, remember the locations of the screws and fasteners of other parts. The screws on the housing can be of different lengths. Attempts to screw them into the mouth of the wrong size will not be crowned with success.

Unscrew the fasteners from the back panel.
If you are repairing a tabletop appliance, remove the stand.
Disconnect the modules on the board from the board.
Remove the cover, taking care not to damage the device cables.
Remember how the loops are attached. Detach them by gently pulling each out of the slot.
Lift up the side frames and check if there are any loops under them. Disconnect any cables attached around the perimeter of the TV

This is true for LG TV.
If the loops are pinned down by the planks, first remove the planks.
Take a new TV matrix and carefully place it next to it on a soft, flat surface.
Transfer the modules and boards of the new matrix to the device by sequentially connecting them to the loops.
Put the TV back together.
Check the equipment is working properly. Use the instructions for the device and configure it through the service menu.

If the line drivers on your Philips TV are scattered, try raising the Voff voltage.

In many cases, replacing the matrix on a Samsung TV is not advisable. It may be that the final cost of the procedure equals the price of a new device. However, you can try to solve the problem on your own.

Samsung TV is a popular product and it's easy to find accessories for it. The total cost of parts for a Samsung TV and the expediency of actions depends on the model of the device. The price for a Samsung matrix can reach 80% of the payment for the purchase of a new unit. You can also find and order a relatively inexpensive matrix. This is due to the fact that the Samsung brand produces a large number of products belonging to different price categories. Samsung replacement matrix can be bought even on a cheap Chinese site. However, it should be borne in mind that not all Samsung TV parts are equally common on the market.

Mine boards on LG TVs can fail every few years. A new replacement part can be difficult to find, so repairing the TV matrix will not work.

Parsing the device and fixing the problem

It is very important to carry out the disassembly procedure very carefully so as not to damage other components of the device and make repairing the TV prohibitively expensive.

It is especially important to be careful when removing the screen itself, because breaking the loop leading to it will require, as in the case of physical destruction, a complete replacement of the matrix. Alas, such a repair can not always be called a profitable solution, because taking into account its cost, it would be much more reasonable to purchase a new model

The exact price depends on the characteristics of the matrix, the presence of other defects, as well as the availability of the new screen for sale. Before disassembling the TV, you need to prepare enough space on a large table. The space should be at least 2.5-3 times larger than the dimensions of the device. This is necessary for convenient transfer of various elements, such as screws, boards, and the matrix itself. It is also recommended to place a piece of cardboard or thick soft cloth on the place where all procedures will be carried out, which will protect the display from scratches, chips and other damage.

Alas, such a repair can not always be called a profitable solution, because taking into account its cost, it would be much more reasonable to purchase a new model. The exact price depends on the characteristics of the matrix, the presence of other defects, as well as the availability of the new screen for sale. Before disassembling the TV, you need to prepare enough space on a large table. The space should be at least 2.5-3 times larger than the dimensions of the device. This is necessary for convenient transfer of various elements, such as screws, boards, and the matrix itself. It is also recommended to place a piece of cardboard or thick soft cloth on the place where all procedures will be carried out, which will protect the display from scratches, chips and other damage.

Then the TV is placed on the table with the screen down and the screws holding the cover are unscrewed along the perimeter of the case. After that, it should be easy to remove, but sometimes you also need to find an additional retainer and put it in a different position. After following this procedure, turn the TV over and remove the front frame from the latches to help you access the matrix. In some cases, it is possible to access the internals of the TV not from the back, but from the front, which depends on the design of the device.

If you accidentally spill a drink on the TV (coffee, soda, etc.), after which image artifacts appeared on the screen, then sometimes to restore the TV's performance, it is enough to clean the cables leading to the display. In this case, from the tools, in addition to the screwdrivers for parsing, you only need a regular eraser. However, this method will not help with physical injuries. A video lesson will tell you about the correct cleaning of the loop:

Repair of LCD screens

DIY LCD TV repair requires extreme caution. It will be a little more difficult than repairing an ordinary CRT TV

But learning is not difficult if you want to. The most important thing is to take care of the screen.

First, it is important to read the instructions for the TV. The liquid crystal screen can be of two types: LCD and LED

They differ in the nature of the backlighting elements, in the first case fluorescent bulbs are used, in the second - LED elements.

In order to check the status of the lights, you can connect the device matrix to the network. If in this case one of the lamps does not work, you can simply replace it.

The most important thing is caution in work, it is important not to damage other parts

If it is possible to check it without removing the matrix, then it is better to do just that. The burned-out element is removed with a soldering iron.You need to select a backlighting element by bringing an old light bulb to the store, there they will pick up a completely identical option for you.

If the screen is damaged, the repair will not help, a new one is needed. The replacement can be done independently, but if you are not sure of the correctness of the actions, it is better to contact a professional. It should also be remembered that each model and different manufacturers have their own peculiarities when repairing.

Repair of the TV matrix cable: step-by-step instructions

Today ice TVs and plasma TVs are not a gimmick. One of them can be found in almost every home, office or on the corner of a large supermarket. Such devices have specific breakdowns that require special repair. All well-known manufacturers: Samsung, Philips, Sony, Toshiba provide their warranty period, so the service center must provide its free services.

It is sometimes impossible to fix the matrix, since the screen is cracked or completely broken. A broken matrix cannot be repaired, its restoration does not make sense. Therefore, it just needs to be replaced. But if the matrix cable is out of order above, then you can fix it yourself, using the master class lessons.

Repair of the TV matrix cable should be done in stages.

Loop repair instructions:

Disassemble the TV case;
Identify the damaged plume that needs to be repaired;
Carefully you need to disconnect the cable from the matrix, do not shake it, but pull it straight out;
Clean damaged contacts, degrease them;
Solder the contact;
Install the loop in place;
Assemble the device.

This process requires the utmost clarity and care so as not to damage the rest of the thin plumes. At the end of the work, the TV must be checked and made sure of the correctness of its actions. In order not to do such a responsible job, it will be easier to replace the damaged loop with a new one.