DIY projection TV repair

In detail: do-it-yourself repair of projection TVs from a real master for the site my.housecope.com.

It is impossible to imagine a modern apartment or house without video and audio equipment. This equipment is used every day and therefore breaks down more often than others. There are several ways to repair TVs: send the technician to a service center, call a qualified technician at home, or make repairs with your own hands.

Before you start repairing a TV, you first need to make sure what the problem is. This will also help if you do the repair yourself, and then when the master comes, you will be able to explain the situation to him.

There are several types of malfunctions that can most often be found when a TV breaks down.

The technique does not turn off. In independence, a CRT TV or a modern LCD model has broken down, this malfunction is associated with a blown fuse. Only different models have distinctive details from each other. You should also pay attention to the diode bridge - perhaps it was he who burned out.
In both domestic and imported models, the potential can often go astray, for the function of which the posistor is responsible.
If the plasma TV monitor is broken, then the problem, most often, is interference or drops, light or dark stripes may appear, color changes while watching a program or movie.
The problem may be a broken cord or a faulty outlet.

If we take into account all the troubles listed above, it is worth saying that the most difficult breakdown is considered to be a screen malfunction. For example, light reflections appear on your monitor after the liquid hits the matrix or the TV is hit, then it is better to carry it to the teleservice. Here it will certainly be repaired, and if the warranty period has not expired, then it will be free of charge or at a reduced price.

Video (click to play).

See also - How to choose a TV for your home in 2018?

You can try to fix some malfunctions of TVs yourself. And it doesn't matter here - these are LCD models, LCD or LED, it is not necessary to call the wizard if you are confident in your abilities. But caution never hurts, because such TV models are not cheap, and without having any repair experience or knowledge in this area, you can only harm and aggravate the breakdown.

Before you start repairing LED or LCD TVs, you must carefully read the instructions, and also study the principle of operation of your model. Anyone, even far from this field, will understand that the repair of TVs such as LCD or LED will differ from CRT models. In the latter case, you are guaranteed not to run into a faulty PTC thermistor. The main thing here is to determine the problem, why does the backlight not work?

If you are repairing LCD, LED models, then the only difference here will be what kind of backlight is used. If it is an LCD TV, then the backlighting is produced using fluorescent or fluorescent lamps. For TVs, LED backlighting is produced using LEDs. At this stage, the differences between LCD models usually end.

The breakdown may consist only in the fact that there is no power, in order to check this on an LCD TV, you can do the following with your own hands:

open the back cover of the model;
remove the wires connected to the matrix;
connect the working lamp to the contacts;
there are also LCD models in which more than one light source is provided. In this case, all sources must be tested.Just dismantle the matrix and plug your TV into the network - you can see which LED is the problem.

When a broken lamp in an LED or LCD TV is identified, it must be replaced. This stage requires maximum care from the master, as well as the manifestation of special attention. In some cases, the lamp is removed without removing the matrix, you just need to move the protection elements with a rubber gasket and pull out the lamp with a soldering iron. Similarly, it is necessary to mount a working light bulb. Now we can congratulate you - you did the repair of the LCD TV with your own hands! Just pay attention to one important nuance - the new light bulb must fully meet the parameters and dimensions of the broken one!

To repair TVs yourself, look carefully at the matrix! If there are "unhealthy" streaks here, then the breakage is in the matrix. Have a new part? Then everything is simple! You change it and turn on the TV, if it works, then you have accurately identified the breakdown.

If the reason for the breakdown of LCD TVs is the screen, then it is best to purchase new models of LCD or LED equipment. It is not recommended to change the screen of LCD and LED models, as it is impractical! This also applies to the LCD matrix.

What could be the problem with a malfunctioning plasma TV? If it is necessary to repair plasma TVs, then proceed in the same way as described above. Just adapt it to your specific situation. This description can be applied to any model of plasma TV, just stock up on the necessary tools in advance.

Although today most users prefer to use plasma, many still watch programs on more outdated CRT models. Let's find out how to repair a breakdown in such TVs. Below is a step-by-step instruction that will help you repair your electron beam product with your own hands.

If you do not turn on such a device, check first of all the fuses. In these TVs, the back is made up of panels. Therefore, it is necessary to unscrew that part of the panels. Under such panels you will find a board and the power terminals must be connected to the fuse. They are connected to a conventional incandescent lamp, or rather to its base, after which the TV must be connected to the network. In the event that your equipment is in good working order, the lamp will go out after switching on, otherwise, when the fuse has blown, it will either not work at all, or it will constantly burn.
The diode bridge may also break. It should only be borne in mind that it is necessary to regulate and repair it only after making a dial. In this case, not only a multimeter is used, but also a product passport, which indicates the main parameters of this model.
The most difficult breakdown in a TV with a kinescope is a posistor. To check with your own hands, you must first turn off the power circuit, and then turn it on. In this case, the lamp must be monitored. If the work lamp goes out, then it can be said that the posistor is faulty. To make repairs, it is necessary to adjust the resistance of the network and only ventures to change this part.

But not only the matter may be in the posistor, transistors and capacitors burn out in CRT models. The diagnosis of this breakdown can also be made visually. If the condensate is blackened or cracked, then we replace it with a serviceable analogue. Now you know why the TV does not work and how to fix it yourself.

Repair of a projection TV is a laborious process associated with the large size and features of the TV. So, projection televisions on kinescopes have as many as three kinescopes R, G, B, as well as a block of information and additional information coils.One of the main reasons for the repair of projection TVs on CRTs is image burnout during prolonged use of the still picture function. In addition, in projection TVs, a low brightness is initially incorporated, therefore, as a result of prolonged use of an increased brightness level, the phosphor layer may burn out, which will require TV repair.
A common reason for repairing a Liquid Crystal Display (LCD) TV is heat dissipation. The principle of operation of such TVs is based on the illumination of crystals with a powerful lamp, from which the matrix heats up and may fail and require repair. Also, a common reason for repairing such a projection TV is the rather limited life of the projection lamp, which can be further reduced if there is insufficient cooling.

Projection TVs advantages and disadvantages

Projection TVs are very popular because they have no equal in terms of the size of the resulting image, in this regard, they are champions. In addition, these TVs have excellent picture quality in natural colors.

Projection TVs are classified as elite TVs. The image of such a TV is obtained on a transmissive (for projection) and reflective (for projectors) screen. Projection TVs can have large screens (up to 60 ″). And the image of the projectors reaches several meters.

According to the principle of operation, such televisions are divided into two groups: televisions with front projection and televisions with rear projection (rear projection), when the image source is installed behind the screen.

By the type of source of image formation, the following varieties are distinguished: on picture tubes (CRT), on LCD (LCD) matrices, on micromirrors (DLP). In terms of internal structure, all these types of projection TVs are very similar, they differ only in the principle of picture formation.

CRT - CRT models (Cathode Ray Tube). The designs of these models have been worked out for a long time. Typically, these televisions are floor-standing devices, the lower part of which is projection tubes with lenses, acoustic systems and electronics, and the upper part is a mirror and a transmissive screen. The image is formed as follows: from three very bright small CRTs of primary colors, the rays travel a long, broken path through a system of optical lenses, mirrors, prisms hidden in the TV case and are projected onto the screen. This leads to a significant increase in the image and this image is displayed on a large enough screen. These TVs have 50Hz and 100Hz scan rates. The advantages here are on the side of 100 Hz models, since they have a more vivid, clear and stable picture. This is a very important characteristic, because the image is displayed on a large screen, where errors are more noticeable. The optical system must enlarge the picture from the small screen of the tube and bring it losslessly to the large screen.

The tubes in these TVs should have a high brightness. And this, in turn, creates a large thermal load on the phosphor. This creates the problem of the low brightness of CRT TVs. Considering this, it is not recommended to leave a freeze frame for a long time, not to increase the brightness excessively, not to run computer games on such TVs, since all of the above can lead to burning of the phosphor, and this will damage the TV. Another negative side of these TVs is the “burn-in” of a fixed part of the image during prolonged viewing.

Designers are constantly struggling with this problem, so modern models have screen raster surfaces with microscopic stripes, which can increase the brightness of the image. These surfaces direct the light flux towards the audience.But this creates the possibility of darkening the image or acquiring a blue tint when watching TV from the side. Therefore, when choosing a TV model, be sure to pay attention to this.

CRT models may have rainbow silhouette borders on the screen. This is due to the problem of mixing, that is, pictures of 3 colors are not clearly brought together. But this problem has become solvable thanks to sensors built into the screen for precise alignment of the beams. In some models, the convergence is adjusted automatically, in others, it must be adjusted manually. But this should be done no earlier than 20 minutes after switching on, so that all tubes are sufficiently warmed up.

It should also be said that these TVs are much cheaper than plasma and LCD TVs, but they are bulkier and heavier.

Projection TVs on LCD (LCD) -matrices. Now these TVs are in very high demand. They have three primary color matrices (RGB) or one tri-color matrix. In an LCD screen, a powerful lamp is directed at the image, which forms an image directly on the matrix. The rays then travel through the lens system to the tilted mirror and are reflected on the screen. A beam of light passes through several screens, forming an image: a Fresnel screen, designed to turn the beam perpendicular to the plane of the screen; a diffusion screen that enhances the frequency and contrast of the image through the absorption of an external light source, through which the image is visible; protective screen that protects against scratches and mechanical damage.

These TVs attract the attention of buyers with their compactness, small dimensions, and relatively low cost. They have a bright large screen and high resolution. The image on the screen of such a TV is clear, does not flicker. The image quality is very detailed, which is produced by the pixels; the analog signal is converted to digital.

The disadvantages of projection TVs on LCD screens include problems with natural color rendering, a small viewing angle, the problem of heat dissipation of matrices, since a powerful lamp shines through the matrix. Sometimes a "trail" is visible behind moving objects.

Micro-mirror projection televisions (DLP). This is a development by Texas Instruments. The system is based on a microcircuit - a DMD-chip, inside which there are about two million micromirrors, each of which forms a point of the image in a certain place on the screen.

In 1996, this company introduced its digital projection unit, patented under the DLP trademark (Digital Light Processing). This development was marketed as a fully finished Optical Engine, which contained DMD (Digital Micromirror Device) chips, control electronics and an optical system with a light source and a fan. As a result, several models of these projectors appeared on the market, in which there were a different number of chips (1 - 3). The most powerful models contain 3 chips.

What is the principle of operation of these devices? The projection lamp creates a luminous flux. Luminous flux is measured in lumens. It is certified by the ANSI-lm value, calculated as the weld mean of the results of measuring the illumination at 9 evenly distributed points of the control screen with an area of 0.5 square meters. m at the minimum focal length of the projection lens. This luminous flux, passing through a condenser system with a thermal IR filter, mirrors, a total internal reflection prism, enters the combined beam-splitting prism. This prism separates the components of the primary colors from the stream and directs them to the surfaces of the micromirror chips of the corresponding channels. The modulated color components reflected by the chips are combined by a combined prism into a total luminous flux, which then enters the projection lens.

The advantage of DLP - projectors is good overall contrast, the absence of loop loops on the screen, that is, very clear image contours, accurate color reproduction, high brightness. In addition, micromirrors do not have the effect of flashing white pixels on adjacent black pixels, which provides better image contrast and transmission of thin lines. All of the above suggests that these models provide high quality color images.

Three-chip devices are very expensive. This is tens of thousands of dollars. Models with one chip are much cheaper (from three thousand dollars). But this causes an additional load on the viewers' eyes, since a rotating color separation disk is added to the system, on which there are windows sequentially painted in primary colors, and the eye has to perform the chromaticity averaging operation, since the image on the entire screen appears sequentially in three primary colors ... The frequency of changing colors in a device with a rotating filter is about 150 Hz. This may not be sufficient to remedy the above problems. Very few firms own the secrets of creating new single-chip projectors. These are the American company InFocus, Norwegian Davis, Japanese Plus.

There are devices on two chips: one is used for red, and the other is used for the rest. This system is cheaper than a three-chip one. Reduces the load on the eyes, since the sequential transmission of colors is accelerated, the effect of "flickering rainbow" is reduced.

The main disadvantage of projection systems is the high price and limited service life of the projection lamp (several thousand hours). Since the lamp is powerful enough, it must cool well. And this is a fan that can create additional noise. If the supply voltage fails, the lamp overheats sharply, since the fan stops working and the lamp does not cool down.

Is your projection TV broken? The question arises, what to do, fix the old one or buy a new one?

How to determine the cost of repairing a projection TV.

You just need to call the above phone, an experienced master consultant in 80% of cases by phone will determine the cost of repairing your projection TV.

The fact is that projection TVs have their own typical malfunctions.

According to statistics, 8 out of 10 breakdowns are typical. You just need to tell the master the brand and model of the projection TV and describe the nature of the breakdown.

The make and model can be viewed on the back of the TV. Consulting a wizard by phone will help you decide what to do next to buy a new TV or make a request to repair an old TV.

For example, the photo shows a sticker on the back of a Samsung projection TV model SP-47Q7HFR.

The most common failure of this model is non-alignment of the rays.

The image doubles and fuses, it is impossible to converge the rays in the information menu. Settings don't help.

This breakdown is eliminated by replacing the information chips STK392-040 on the board of the AA41-00601C information module.

The photo shows the AA41-00601 board with two STK392-040 information chips that need to be replaced.

Despite the fact that, as a rule, one of the microcircuits fails, it is advisable to replace both, otherwise after a while this failure may appear again.

The ST392-040 microcircuit is a three-channel power amplifier. There are 6 amplification channels in two microcircuits, two for each color, red, blue, and green.

Two channels for each color are needed for vertical and horizontal ray correction.

This photo shows three picture tubes of the Samsung SP-47Q7HFR projection TV.

Either way, fixing a projection TV is cheaper than buying a new one!

Do-it-yourself TV repair is a responsible business, since today a large number of different models (LCD, LSD, CRT) are presented on the market, each of which has its own technological features. Therefore, the approach to each type of TV is individual; in some cases, special skills will be required (knowledge of electronics, experience with a soldering station).

Before proceeding with the repair of television equipment, it is necessary to find out the cause of the problem.

The most common problems are:

TV screen does not turn on - this can happen with an old picture tube screen and with the most modern television panel. Basically, this symptom is characteristic of a blown fuse. When repairing, it should be borne in mind that the appropriate fuse must be selected for each model. And also experts recommend paying attention to the diode bridge, power supply, wire, perhaps the cause of the malfunction lies in these elements. Read also what to do if Samsung TV does not turn on.

Faint, barely noticeable picture - such a breakdown happens with LCD / LCD monitors. The most likely cause of the malfunction: faulty diodes, device backlighting.
There is no sound, the screen "wheezes" - most likely, the sound amplifier or microcircuit is out of order. Also read what to do if there is sound, but there is no picture.
Monitor is on, no picture - Perhaps the cause of the problem is in the video processor or in the receiving unit.

You should be aware that if a darkening of the board or rupture of elements is detected during a visual inspection of television equipment, then it is not recommended to immediately start replacing parts. Since such factors indicate a short circuit that could have occurred in another section of the TV. Therefore, if you do not eliminate the cause of the short circuit, but simply change the failed elements, then the situation will repeat itself.

To repair television equipment, the following tools and equipment may be required:

Screwdriver Set;
hex keys (in rare cases);
pliers;
soldering station (for repairing modern monitors);
screen layout (can be downloaded on the Internet);
multimeter;
oscilloscope.

Many LCD screen problems can be dealt with on your own. But you should know that these screens require more careful handling than, for example, CRT TVs.

First of all, the user needs to study the instructions for his model, and only after that start repairing the LCD or LED screen. You should be aware that LCD TVs use fluorescent bulbs for backlighting, while LEDs use LEDs.

The TV may not function due to lack of power, to check this, you need to do the following:

Open the back cover of the LCD TV with tools.
Disconnect the wires that are connected to the device matrix.
Connect a working light bulb to the contacts.
Some panels have more than one light source, in which case they must be tested as well. This can be done as follows: pull out the TV matrix and connect it to the network, it will immediately become clear which lamp is out of order.

After the faulty luminaire is found, it must be replaced. This procedure should be carried out as carefully as possible. In most cases, the lamp can be taken out even without removing the matrix - you need to move the protection elements and get the burned out part using a soldering station. Then a new lamp is installed in the same way.An important rule is that the new lamp must be completely identical to the old one.

Read also: DIY minibus body repair

In addition, a certain area of the backlight may burn out.

In different models of television equipment, the lamp is replaced in different ways. For example, for many Daewoo, Akai and Hitachi TVs, to dismantle a burned-out lamp, you will need to remove the matrix from the panel and reinstall the element on it. At the same time, for some Rolsen and Funai, it will be possible to change a burning light bulb or diode without dismantling it. Depending on the design, you will need to bend (unsolder) the contacts, remove the gasket and carefully remove the burnt element from the case. In its place, a completely similar lamp is installed, both in terms of parameters and dimensions.

Photo - LCD monitor device

Many Chinese models of television equipment - CTV, VAO, BBK, during disassembly you can see light stripes on the matrix. They indicate a breakdown of this particular element. Due to some external factors, the part stopped working and oxidized. In this case, you need to select an element that is identical in terms of performance and install it in the place of the faulty one.

Unlike old stationary CRT or portable models, plasma and ED versions are very rarely repairable if the screen breaks. This is a very time-consuming process, so not even all professional workshops undertake such work. In most cases, if the monitor is cracked, it will be cheaper and easier to buy a new TV set than to repair the old one.

Video: PHILIPS TV repair

Despite the total use of plasma, many owners still have more outdated CRT TVs (for example, Vityaz, Elt, Rubin, Horizon, JVC). Step-by-step instructions on how to carry out repair work on electron beam models:Tips on how to check the TV posistor may be different, but any professional telemaster will recommend that you measure the resistance between its contacts. The part has four of them, that is, two pairs. For one honey, the resistance can be up to 600 ohms, while the other's resistance is in the range of 1-5 ohms. But this is only a theoretical check; for a more accurate diagnosis, you will have to solder the posistor.In addition, capacitors and transistors often burn out in CRT TVs. They can even be diagnosed visually. They swell or change color on the board. If you see that the capacitor is blackened or cracked, then it must be replaced with a working analogue.It is no secret that a breakdown of a television receiver can ruin the mood of any owner. The question arises, where to look for a good master, do you need to take the device to a service center? You need to spend your time on this, and what is important - money. But, before calling the master, if you have basic knowledge of electrical engineering and know how to hold a screwdriver and a soldering iron in your hands, then repairing the TV with your own hands in some cases is still possible.Modern LCD TVs have become more compact and easier to repair. Of course, there are breakdowns that are difficult to detect without special diagnostic equipment. But most often there are malfunctions that can be detected even visually, for example, swollen capacitors... With such a breakdown, it is enough to evaporate them and replace them with new ones with the same parameters.All TV sets are the same in their structure and consist of a power supply unit (PSU), a motherboard and an LCD backlight module (lamps are used) or LED (LEDs are used).It is not worth repairing the motherboard on your own, but the power supply unit and screen backlight lamps are quite possible.As already mentioned, the design and principle of operation of LED and LCD TVs, regardless of the manufacturer, are the same. Of course, there are some differences, but they do not play a significant role in the diagnosis of faults. Often, in the event of a problem with the power supply, the LCD TV does not turn on at all, while there is no indication, or it turns on for a while and turns off spontaneously. Using an example, the repair of a DAEWOO LCD power supply unit (can be applied to plasma) is considered, which is not much different from repairing an LG TV, as well as Toshiba, Sonya, Rubin, Horizon and similar models.

First of all, before you repair the TV, you need to remove the back panel of the device with a screwdriver by unscrewing the screws. On some models, the rear wall may be latches installedwhich must be handled with care so as not to break them.

After removing the cover, you will see the power supply unit, consisting of several modules on the left, and the motherboard on the right.

On the power supply board you can see 3 transformers: the bottom one is the mains rectifier choke, the top one on the left (large) feeds the inverter, and on the right is the standby power supply transformer. You need to start checking with it, since it turns on the standby mode of the TV receiver.

Duty transformer when the device is connected to the network, it should give out a voltage of 5 V. In order to correctly find the wire on which you need to measure the voltage, you can use the diagram, or you can see the markings on the case. In this case, opposite the required contact is written - 5 V.

Measurement is taken first open circuitby connecting one probe to the found contact, and the other to the cathode of the diode on the radiator. In this case, there is no break.

Further, one tester probe can be attached to the body of the device, the other to the previously selected contact, and measure the voltage, having previously connected the telly to the network. In this case, the device shows 1.5 V, instead of the required 5 V. Such readings of the transformer indicate that it is working, but not at full strength. The reason may be dry condenserlocated below, or swollen - above the transformer.

To remove the parts that have become unusable, it is necessary to remove the power supply board. To do this, first disconnect all wires and the matrix cable coming from the inverter and the system board. So that in the future, after repairing the power supply, you do not get confused where what is connected, you can take a picture of them before disconnecting the wires and loops.

Now you can remove the entire LCD TV power supply by unscrewing the 4 screws. After removing it, it is very important discharge all capacitorsto avoid electric shock.

We solder the defective capacitors and replace them with new ones, observing the polarity.

The assembly of the device takes place in the reverse order: the board is screwed into place, all connectors and cables are connected, the rear panel of the unit is closed.

We again measure the voltage on the transformer of the TV's power supply (the device should turn on) and see that it has become 5v. When you unfold the repaired TV receiver, you will see that it works.

As you can see from the review presented above, repairing TV power supplies with your own hands is not such an overwhelming task. Following this description, you can also repair plasma TVs.

Do-it-yourself TV repair with a kinescope, for example, such as: Rubin, Horizon, Sharp 2002sc, LG TVs, as well as repair of the Vityaz TV, begins with checking the power supply unit for operability (this is done if the unit does not turn on). It is checked using incandescent bulbs for 220 V and a power of 60-100 W. But before that, be sure to disconnect the load, namely the horizontal output stage (SR) - connect a lamp instead.The CP voltage ranges from 110 to 150 V, depending on the size of the tube. Must be found in the secondary circuit SR filter capacitor (its values can be from 47 to 220 microfarads and 160 - 200 V), which stands behind the SR power rectifier.

To simulate the load, you need to connect a lamp in parallel to it. To remove the load, for example, in the popular Sharp 2002sc model, it is necessary to find and unsolder the inductor (located after the capacitor), the fuse and the limiting resistance through which the CP stage receives power.

Now you need to connect the power supply to the power supply unit, and measure the voltage under load. The voltage should be between 110 and 130 V if the CRT has a diagonal of 21 to 25 inches (as in the 2002sc model). With a diagonal of 25-29 inches - 130-150 V, respectively. If the values are too high, then it will be necessary to check the feedback circuit and the power supply circuit (primary).

It should be noted that electrolytes dry out during prolonged operation and lose capacity, which, in turn, affects the stability of the module and contributes to an increase in voltage.

When the voltage is too low it is necessary to test the secondary circuits to exclude leaks and short circuits. After that, the diodes for the protection of the power supply of the SR and the diodes for the power supply of the vertical scan are checked. If you are convinced that the power supply unit is working properly, then you need to disconnect the lamp and solder all the parts back. This check can also come in handy when doing DIY Philips TV repairs.

Another common breakdown of the TV that can be eliminated is the burnout of the backlight lamp. In this case, the TV receiver, after switching on, flashes the indicator several times and does not turn on... This means that after self-diagnosis, the device notices a malfunction, after which the protection is triggered. That is why there is no image on the screen.

For example, a Sharp LSD TV receiver with this malfunction was taken, although in this way it is possible to repair Samsung TVs, Sony Trinitron, Rubin, Horizon, etc.

Next, you need to be careful disconnect loops from the matrix.

The next step is to detach the control panel from the case. You do not need to remove it, you will still need it to turn on the device.

The remaining loops also need to be disconnected. Then it is necessary to remove the housing on which the electronic boards are fixed.

Before removing the matrix, unscrew front frame... We remove the matrix itself and filters, snap off the side mounts.

We connect the power and hold down a few keys to enter service menu... This will keep the lamps on for a while.

The figure below shows that after turning on the lamps, the 5th from the top turned out to be inoperative. Disconnect it and replace it with a new one - now all the lamps are on when checking.

The assembly takes place in the reverse order.

After that, you need to turn on the TV receiver and enter the service menu for reset lamp error counter... If this is not done, the device will not work. Entering the menu, you need to find the corresponding line and reset by selecting ok. Now the repair of the LCD TV set is finished. Tests show that the unit is operating normally.

Thus, you can repair the Philips and LG TV with your own hands, and other LCD panels, as well as devices with LED backlight (LED). Owners of the latter type of devices should read the article on repairing LED backlighting, where the whole process is described in detail using the example of an LG TV.

Among the typical and simple reasons that the TV set does not turn on, there may be a remote control or a lack of signal from the antenna cable.

If the TV does not turn on with the remote control, first, you need to make sure the batteries are good. If they are shrunken, replace them. Often the TV set cannot turn on due to contamination of contacts under the buttons.To do this, you can disassemble it yourself, and clean the contacts with a soft cloth from accumulated dirt. If your remote control has been dropped, it is possible damage to the quartz emitter... In this case, it must be replaced. Well, if you filled the remote control with water or some other liquid, and it did not work after disassembling and drying, then it will have to be replaced with a new one.

You can learn more about fixing the remote control in the following video or article.

When repairing TVs LG, Sharp with LCD, Rubin, Horizon with the same screens, a situation often arises when it does not turn on when the device is in good working order. It turns out that the reason may be no TV signal in the antenna cable. This happens due to the operation of the noise suppression protection (in Rubin TVs, they began to install it not so long ago), and the unit goes into standby mode. Therefore, if you find your TV set inoperative, you should not panic, but you need to check the presence of a signal from the transmitting station.

In conclusion, we can say that when you decide to repair a TV set yourself, you should soberly assess your abilities and knowledge in this matter. If you do not feel confident, then it is better to entrust this matter to a telemaster, especially since nobody canceled 220 V, and ignorance of basic safety rules can entail unpleasant consequences.

Video (click to play).