Repair of LCD TVs

Modern urban housing can not be imagined without video and audio equipment. Every person uses this type of technology every day, and quite intensively and regularly, in fact, that is why it so often breaks down partially or completely out of order. In principle, thanks to detailed instructions and recommendations, you can make and repair LCD TVs at home, because there is nothing too complicated.

Almost any TV failure can be handled on its own, the main thing is not to panic and follow instructions. And now we will consider in detail how to repair LCD TVs Samsung, Thomson, Panasonic and Sharp and other models. And the most popular breakdowns and methods for their elimination, we will consider in more detail and separately.

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The

monitor ceased to function The above mentioned TVs differ only in illumination, but they do not have any fundamental distinctive characteristics.

Important! In LED models, the monitor is illuminated with LEDs, and in LCD TVs - with fluorescent lights.

Therefore, in the event of a monitor failure, first of all, check the power of the backlight, that is:

1. . Regardless of the model of the device, remove the back cover and the power grid wires from the matrix. Naturally, before this it is necessary to disconnect the unit from the power supply.
2. To check the operation of the wires, you should try to connect to them the most ordinary lamp.

Important! Modern TVs often have several backlight sources and therefore it is recommended to check them individually.

1. To test the matrix, you need to connect the lamp to the contacts and plug the wire into the network.

If everything is correct, then the lamp will light up, and if not - you just need to replace the cable or repair individual threads.

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The

fuse has blown out. It is not difficult to determine exactly this breakdown, because a blown fuse immediately catches your eye, that is, there is no thread inside the glass bulb. Sometimes on the glass, traces of carbon deposits are clearly visible.

Important! Remember, before you start replacing the fuse, that only in ten percent of a hundred the device starts working again.

There is a similar repair of LED TVs with the use of tools such as:

• tweezers;Soldering iron with a set of stitches;
• microscope;
• cutters;
• special meter.

Otherwise, you simply will not be able to replace yourself with such a fragile, small, but at the same time, important for the operation of the TV element.

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The vertical stripes appeared on the screen

What to do in this situation? The appearance of such strips on the monitor clearly indicates problems with the drivers, that is, the controllers, decoders and decoders of the matrix liquid crystal panel.

Important! It is thanks to these chips that the color signal is converted to redirect and start the operation of each pixel.

As a rule, they are located on flexible plaits near the matrix, which divide its surface into several parts. We work further to make the LCD TV repair, thus:

1. Turn the panel down facing and place it on something soft.
2. Then unscrew the bolts and screws holding the back panel.
3. We find the board of the power supply unit, the signal processing unit and the board responsible for the illumination. Here the main task is to get through all these elements to the trains, and in order to do this, it is necessary to remove the frame of the device.
4. We disconnect the signal processing board and release the loops, we check the reliability of the connection of each connector.
5. Carefully detach the traces of the intermediate board of the matrix and inspect, because it is possible here that small cracks formed.
6. Install the board in place, turn on the TV.The strips will tell us the fault of the specific driver: it is simply necessary to press the trains alternately, and if the strips disappear, then the problem lies precisely in this place.
7. Return the loops to the site by pressing them in the desired points, and you can use two-sided adhesive tape to do this. Your main task is to squeeze out the loosened loop as tightly as possible to the matrix.
8. Sometimes the restoration of contacts occurs with the help of a soldering station or an iron. As a result - the cable is securely glued with current-conducting adhesive, which has a low resistance under the compact.
9. The heated soldering iron helps to restore the contacts of the matrix with the cable.

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Problems in the

power supply unit It is not difficult to check the operation of this element. It is necessary to disconnect the load and connect the incandescent lamp to it. If the voltage does not exceed 110 volts, then this will be a clear indication of a breakdown in the power supply.

Then the transformer of the unit passes, which should produce a voltage of at least 160 volts. To understand, you should disconnect the power supply from the sweep by disconnecting the fuse or throttle.

Using the same incandescent lamp, we check the transistor, the input circuits and the network rectifier. If the light bulb will light up and go out immediately, this will clearly indicate the failure of the power supply.

Important! In order not to expose the device to the danger of a final breakdown, it is better to replace the damaged element.

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Illumination problems

Repair of LCD TVs is often associated with a malfunction of the scanning unit and the power supply, that is, its screen simply does not light up. As a rule, in such cases, the fault is the violation of the integrity of the monitor itself, or contacts, trails that go to it.

The problem can also be connected to the radio channel - in such cases there is either no sound or image:

• If there is no picture, but there is a sound, the video amplifier or the color block is likely to be unusable.
• In a reverse situation, the problem is the breakdown of the tuner or its winding.

Important! Maximum attention during the diagnosis should be given to the control unit, and help can be obtained by reference data or diagrams that are present in the technical passport of the device.

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The TV does not turn on at all

Similar symptoms, as a rule, are somehow connected with the lack of voltage in the mains, because if only the light bulb was fused, the TV would work in the usual mode. But you do not need to despair at once, the main thing is to exclude all possible failures in time, which you can eliminate yourself.

Of course, the situation also happens more serious when the fault is due to the breakage of the fuse resistor. Following detailed instructions and schemes, even a person with little knowledge of this technique will be able to solve such problems.

We hope that you were able to restore the working capacity of your TV set yourself and that nothing prevents you from enjoying watching your favorite programs and movies.