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Owners of television receivers with LCD screens sometimes face a situation where it is necessary to replace the matrix on the TV. At the same time, the question arises: is it not easier to buy a new device, since the cost of replacing the LCD panel in service centers is very high? And if we add here the price of a new screen, it turns out that the repair will cost almost the same as a new TV set. But in fact, not everything is so sad. Replacing a TV matrix is not such an impossible task. If you know the procedure, then this procedure can be performed by any home master who knows how to hold a screwdriver in his hands.
What is an LCD matrix
This is the main element of TV technology, responsible for the formation of the image. The matrix is a flat container, where a layer of liquid crystals is applied between two plates. The latter, when voltage is applied, change the intensity of the glow.
Each individual crystal, also known as a pixel, carries three colors — blue, red and green. Light, passing through a particular tone, forms the final picture. That is, here we have a kind of set of mini-projectors.
Types of matrices
On the market you can find TVs with different types of matrices, but it is customary to take devices built using TN and IPS technology as the basis. And everything else (PLS, VA, etc.) are derivatives.
TN (TN + film)
The crystals here are lined up horizontally and are at a slight angle to each other, forming a spiral. Devices with TN-matrix are characterized by good response speed and low cost. A major disadvantage of this technique is modest viewing angles.
IPS
In this case, the crystals are aligned parallel to each other. IPS TVs offer maximum viewing angleswhile maintaining image quality. But due to the specifics of the technology, the response speed is noticeably increased. The cost of IPS matrices is much higher than TN.
Signs of matrix breakdown
Liquid crystal technology, in addition to obvious advantages, has one significant drawback — frequent breakdowns of the matrix. Repair in specialized centers is an expensive procedure, but on modern devices it can be replaced at home.
Liquid crystal technology is picky about almost everything. The matrix can fail under physical impact, contact with moisture or even dust. Improper operation of the device also leads to sad consequences.
Visual effects indicating a breakdown of the matrix:
- spots on the monitor of different intensity;
- vertical or horizontal stripes;
- artifacts like «snow»;
- chaotic colored pixels;
- flashing picture.
If one of the above effects is detected, you should immediately begin to solve the problem, otherwise the matrix may completely fail, pulling other important elements with it. Consider the most common defects in more detail.
Mechanical impact
If the TV fell or was hit, the matrix will immediately let you know about it with a downed image. Some budget models even react to soft objects or finger pressure. It is quite easy to identify such a defect by microcracks on the screen, broken glass or chips on the case. In addition to impacts, the cause of breakage can be bending of the screen, for example, during transportation.
Image distortion
There can be a variety of effects here. Some problems disappear by themselves when, for example, the equipment warms up, while others remain.
The matrix needs repair in the following cases:
- slowdown of frames;
- the appearance of thin vertical stripes;
- screen flickering in dynamic scenes;
- wide multi-colored stripes.
Important! Similar problems may appear when the control chip fails.
Spots
By the appearance of the spots, you can determine the source of the problem. If the area is light, then this indicates broken glass or delamination of the matrix. Large dark areas indicate a kink or moisture ingress into the device. Small black dots are bad pixels. The latter are beyond repair.
Matrix Replacement
Replacing the matrix on a Sony TV differs slightly from the procedure for replacing the screen (matrix) on an LG TV. Mainly, the difference lies in TV designs, which affects the order of its disassembly. Fasteners can be implemented in the standard way — on screws, or less convenient — on latches, which are harder to find and easy to break. Disassembly of the unit can be accessed from the front or from the back.
Front side access
With frontal access to the disassembly of the device, you should start by releasing the latches that hold the panel lining.
There are models of LCD devices, including plasmas, which have a protective glass in front of the matrix. If the screen was broken, then you will have to change the protective glass.
After the latches are released, you will see the LCD TV matrix screwed to the TV body with screws that need to be removed. Please note that some screws may be duplicated with a latch. After that, unscrew all the fasteners on the back of the device, covering the entire electronic filling of the device.
Access from the back
To replace the matrix on an LG, Samsung or any other TV, including a plasma one, you will need to unscrew all the fasteners holding the rear panel of the unit and remove the stand if it is a desktop model of the device. Since screws of different lengths can be screwed in different places on the back cover, you need to remember their location.
There are designs of television receivers in which a special hatch (for example, on an LG TV) for service during the warranty period. When removing the cover, you need to be careful not to damage the cables going to it. Also disconnect any modules that may be on the cover from the board. Screen replacement is carried out in a similar way with a plasma TV.
Next, follow these steps.
- When the cover is removed, you will see the metal housing of the LCD TV matrix in front of you, on which all the electronic boards of the device and the cables connected to them are fixed. You will need to be careful in disconnecting the cables (they cannot be loosened in different directions, but you need to pull, carefully, in a straight line). Disconnect them from all boards and modules of the unit. In order not to get confused, how to connect them back, before dismantling the LG TV matrix, photograph their location.
- Also turn off all loops around the perimeter of the device. In some models, they may be hidden under the bezel surrounding the LCD panel. Attention: there are loops that can be pulled out only by lifting the bar that presses them.
- Next, you need to take a new unpacked matrix, and put it next to (laying something soft) with a faulty one. This is done to make it easier to transfer parts.
- The next step will be to transfer all the boards and modules one by one from one case to another. As soon as the board is transferred, immediately connect all cables to it coming from the screen.
- When all the modules are connected, you can install the cover and the frame (if any) in place, close the back panel, and then finish assembling the LCD TV receiver, and then check the device’s performance.
In order for the telly to start working correctly, it will be necessary to coordinate the new matrix with all modules. To do this, you need to turn on the device, enter the service menu, and make settings. How this is done is shown in unit instructions.
Expert advice
In order to correctly identify the causes of a breakdown, one should first of all eliminate problems with peripheral and internal equipment: check the cable, set-top box, video accelerator and color block.
The backlight can fail due to power surges. If necessary, it is easily replaced. If the repair exceeds the cost of a new matrix, then it makes sense to simply replace it.
Advice! It is also useful to check the warranty period. If they do not come out, then the device with problems of any type must be taken to a service center.
Replacing the screen in an LCD or LED TV is not a difficult task, but it requires extreme care, since you can damage not only very thin cables on the new matrix, but also the matrix itself, since it is very sensitive to bending. Some other TV malfunctions can also be repaired with your own hands.
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