TV no picture there is sound DIY repair

In detail: there is no TV image there is a sound DIY repair from a real master for the site my.housecope.com.

You are faced with such a problem on your TV: the TV screen is black, but there is sound. Naturally, due to this malfunction, viewing the programs is not possible. In this article, we'll show you what to do about this problem. What caused the picture to disappear? Let's take a look at the internal and external causes of the problem.

To understand what went wrong, the first thing: we look at the equipment. If the equipment is completely new, this malfunction may appear due to the manufacturer's defect.
If the device has served you for several years, there is a possibility that the batteries or backlights are out of order.

It follows from practice that the technology itself most often has absolutely nothing to do with it: this malfunction is not always the result of equipment failure. Uninterrupted image reproduction depends not only on internal elements (boards, circuits, blocks), but also on external ones (antenna cable, distribution box, etc.)

Don't be discouraged if you just see a black screen when you turn on the TV.

There is a chance that the solution to the problem is very close:

Antenna cable (cord);
Distribution box;
Plug;
An external antenna located on the roof is the most vulnerable element in this problem.

Inspect these items, especially the plug. Basically, it is connected from the back to a special connector (socket).

First you need to pull it out of the connector and insert it back. There is a possibility that the signal through the plug is weak due to poor contact. This can be one of the sources of image fading.

Video (click to play).

Next, you need to connect a second TV (of course, a working one) to the antenna wire in order to check the signal quality.

If, after connecting, a poor-quality signal began to arrive or there is simply no image, then most likely the problem is either in the external antenna or in the antenna cable.

If there is a problem with the external antenna, then all that remains is to call the organization responsible for its maintenance.

Try to see if your TV has a mute function. This is true for newer LCD / LED TVs such as:

Philips (Philips);
Toshiba (Toshiba);
Sony (Sony);
LG (LG);
Samsung (Samsung).

Certain TVs tend to turn off the picture: this function allows you to listen to the sound of the TV or DVD player while the picture is turned off. - Make sure not to enable this function.

But if we exclude all factors from the outside, then only the problem remains at the hardware level. Let's take a look at what's the matter.

A common cause of malfunctioning new TVs, due to which the image disappears when sound is present, is the failure of lamps or screen backlight LEDs.

The easiest way to determine if the problem is in the backlight or not is: take any light source (lamp, hand torch or even a flashlight on your phone) and, with the TV turned on, bring the light source to the screen.

If you see that the image is there, but it is very difficult to see it, then your lamps or LED strip are out of order. Of course, there is a possibility that the color module, power supply, frame and line scan unit, tuner or matrix have failed.

If you are not an expert in this matter, it is rather difficult to replace or repair the listed parts, therefore, this work should be carried out only by a TV repair specialist.

Equipment often fails due to improper operation.

Unscrupulous attitude to the appearance of minor malfunctions, mechanical stress, penetration of moisture into the body - all this leads to wear of the components, as a result of which malfunctions appear.

One of the most vulnerable spots in modern TVs is the inverter. This part often fails. An inverter is an expensive part, so a specialist will most often recommend repairing it rather than replacing it. This problem, due to which the image disappeared, is typical for TVs of LG and Samsung models.

Let's just superficially touch on the connection via HDMI of a computer to a TV. In rare cases, with this connection, the image may disappear quite often. The first thing to do is test the HDMI cable itself. Also check if hibernation is running on your computer.

The sound can also be played, but the picture will never be. Basically, everyone can cope with the HDMI cable connection, and this is not a serious problem if you have a whole and working HDMI cable. But this issue has its own pitfalls that the user may encounter.

So what to do. If you do not have an image when connecting, check the cable for kinks, bends, breaks, if there is such damage, you need to replace the HDMI cable.

You also need to check your settings and make sure the computer has not entered sleep mode. Another option is connector failure. In this case, you need to refer the technician to be repaired by specialists.

These are the main reasons due to which the image is not displayed when the TV is connected via HDMI.

Do not forget to say “Thank you”, “Like” or repost to the author:

No picture on the TV screen - one of the most frequent breakdowns of this type of equipment, regardless of models and brands.

There are many probable reasons for the disappearance of the image on the screen. Very often provokes a malfunction lack of screen backlight.

Repairing the TV backlight belongs to the category of especially difficult. Trusting him to a layman is extremely dangerous. It is impossible to perform it independently, without the appropriate knowledge, experience and tools.

Therefore, if your TV turns on, reacts to the remote control, there is sound, but there is no video, the best solution is to contact the VseRemont24 service center!

High-quality TVs will lose their picture after years of flawless operation. Unfortunately, cases when a new technique ceases to be shown happen no less often (if not more often).

It may not even take a year (!) As your TV set will break down if you are not lucky enough to buy low-quality equipment.

Most modern LCD TVs are backlit LED (light-emitting diode)... It is these models that dominate the Russian home appliance market.

The LCD TV screen is a liquid crystal matrix, which is illuminated from the inside by rows of soldered LED strips.

Simply put, LED backlight - this is a set of small light-emitting diodes located in the TV set behind the liquid crystal matrix.

Total TV backlight malfunction options two:

Some line of LEDs burned out. The LEDs are connected in series, so the breakage of any of them entails the failure of the entire LED backlight. At the same time, a voltage of about 200 volts continues to flow to the light bulbs.
Backlight control driver (LED driver) problems... In this case, no voltage is supplied to the LEDs, so they do not light up.

It is not difficult to make sure that the fault of the backlight is the fault of the absence of the image. Shine the flashlight at the TV screen while it is working. After performing forced illumination, you will see the image.

This completes the self-diagnosis.Next, you need to invite a wizard who will diagnose the TV by disassembling it.

The specialist will remove the stand and the back cover of the TV by disconnecting the ribbon cable from the joystick. Will become available three tv boards:

the power supply on the board of which the backlight driver is assembled,
main board,
t-con matrix control board.

Dismantling boards - very painstaking, requiring maximum concentration of attention, occupation. Any inaccurate movement can lead to permanent damage to the TV (for example, a broken cable). Even a simple touch to the matrix with dirty hands will result in poor image quality later.

An experienced specialist will carefully remove:

T-con. Disconnect the loops, unscrew the bolts.
Metal protection from decoders. Unscrew the mounting bolts on the sides.
Front bezel of the TV. Unscrew the fastening bolts along the entire contour.
Decoders with rubber mounts. To do this, the master carefully turns the screen over, holding the matrix.
Diffusion film. First you need to snap off the latches and remove the plastic frame.
Reflector. Remove the retaining clips.

After these steps, nothing prevents you from proceeding with checking the TV backlight itself.

Sometimes the problem of LED burnout is noticeable with the naked eye - one or more bulbs burn at the attachment point, the color of their lenses changes, they melt.

If there are no visible traces of tanning of individual diodes, you will have to check all LED bulbs.

Power is first connected to each LED string. Which ruler not lit up, in that open circuit and / or short circuit.

After that, power is supplied alternately to each LED from the faulty line. Which LED does not burn, that one is defective.

The lens is removed, and the faulty diode itself is desoldered (a soldering hairdryer is used for this). Then a new one is soldered in place of the faulty LED. The lens is glued into place.

TV backlight repair is over!

After that, the wizard checks the backlight for proper operation (voltage is applied) and assembles the TV in reverse order.

If the TV is shown and there are no light or dark spots anywhere on the screen, the repair was successful!

If, according to the diagnostic results, it turns out that everything is in order with the line of LEDs, the problem is hidden in the driver in the power supply.

Each LED driver is unique. After checking with a multimeter, a preliminary analysis of the circuitry is required. Next, changes in the current in the LED bars are carried out, based on the data obtained, and all the necessary repairs or replacement of parts.

Did you know that some TV dealers deliberately set the backlight level to the maximum position in all modes in order to accelerate the failure of LEDs and to bring the hour of repair closer?

Maximum brightness contributes to premature failure of the LED backlight. Therefore, in a repaired TV set not too large (optimally 75%) brightness.

In the home appliance market, LCD TVs have taken their rightful place, along with LEDs, which proves their comparative characteristics. Manufacturers are introducing the latest technology into devices and expanding the functionality of devices. Despite the release of new models of plasma technology, the devices still fail. Many users are familiar with the situation when no picture is shown on the display. In this case, it is necessary to find out the cause of the malfunction and call the wizard. This article discusses why there is sound on the TV, but there is no image on the screen, and how to fix system defects.

Problems with video display on monitors are very common. In most cases the display does not light up at all... But there are other situations:

the picture is flashing, with ripples;
the video signal is interrupted;
a light vertical stripe is visible to the right or left;
blinking backlight lamps;
squares or stripes appear on the image;
red or green borders around the video image;
vertical color stripes on the screen;
the picture is barely visible.

There can be a great many reasons why the image disappears, but there is sound. It is not always possible to independently determine what exactly could break down, and professional diagnostics at a service center will be required. There is no need to blame the manufacturer, since a similar defect occurs on different TVs: Samsung, Lg, Sony, Philips and many others. It happens that the TV turns on, a splash screen appears, after which the displaying display goes out. The channels are switched with the remote control, and sound can be present.

The main reasons may be the following:

the connecting cord is disconnected from the socket;
damaged wire;
the inverter supplying voltage to the backlight lamps has broken;
faulty matrix, motherboard, backlight unit;
defect in the convector, loop or decoder;
electrolytes in the power supply unit are out of order;
inadequacy of the electrolytic capacitor;
in CRT TV, a defect in frame or line scanning;
the cable left the matrix to the board.

Tips for when there is no picture on the LCD TV but sound is as follows.

Make sure the quality connecting cable... Replace the unusable wire with a new one.
On the back of the instrument, check the connection of the cord to the socket.
Turn the volume up to maximum. After this action, the device will work again in the previous mode.
Avoid any mechanical impact on the TV set.
Check device settings... Turn the instrument outputs on or off.
If power outages are common, purchase an uninterruptible power supply.
In order not to aggravate the situation, contact the service center for the repair of equipment.

Note! Our recommendations apply only to a working monitor. In this case, the splash screen appears when the equipment is turned on. If the TV does not show the splash screen and the display is dark, this indicates that some element of the screen is not functioning correctly.

In the case when sound is played on the unit, but there is no picture, you need to check the quality of the wire. Use program Moninfo... The utility is designed to test the transmission of video and audio. If the software detects malfunctions, it becomes clear that the problem is in the connecting cable. The image quality in principle depends very much on the correct choice of this seemingly insignificant detail.

First, you need to test the video signal by following these steps:

on the remote control, select the button with the image of the house;
go to settings;
select the options "support", "self-test", "start image test".

After the issued problems, try to solve them using manufacturer's recommendations:

Nowadays, a rare person does without a TV. Every year the models become thinner, larger and offer more and more new functionalities. Modern plasma screens with Smart TV technology have little in common with devices that were on sale some ten years ago. However, the commonality between the old and new generations still remains - breakdowns and malfunctions still happen. The reasons for this can be very different: blows, falling, ingress of moisture and direct sunlight, or an elementary marriage. In this article, we will take a closer look at what to do if the TV has lost the image, but there is sound. Let's figure it out. Go!

What to do if there is no picture on the TV

First, it should be noted that such a malfunction occurs quite often in a variety of brands of TVs. TVs of all brands are equally affected by this: Samsung, LG, Philips, Sony, Panasonic and many others. Therefore, it makes no sense to blame the manufacturer.

There are many reasons for the absence of an image on the screen, and you are unlikely to be able to determine it yourself by eye.Most likely, you still have to contact a service center or other repair service. It all depends on the nature of the problem. More on this below.

It happens that when you turn on the TV, a splash screen with the manufacturer's logo appears first (LG, Samsung, Philips, and so on), after which the screen simply goes out. With this, you can change channels and hear the sound. Some users noticed that after a while the image appears, but when you turn it on again, everything repeats and the picture is absent. In this case, try the following tips:

Check the connection of the receiver cord as it may have become disconnected. Make sure the cord is plugged in securely.
Also, the problem may be in the cable itself. The wire may be damaged or simply be of poor quality. This concerns HDMI cables. In some cases, replacing the wire can correct the situation.
Check the power cable. It must also be securely connected.
Some users have found a rather original way to solve the problem - to increase the volume to the maximum (or close to it). After a few seconds, the image will appear and then you can set an acceptable volume level.

Please note that all the above tips will only help if the screen is working. This is indicated by the splash screen when the TV is switched on. If there is no splash screen and the screen is constantly dark, this already indicates that some component of the TV that is responsible for the image is out of order.

There are several components, failure of which can cause no picture on the screen. It is quite common that the inverter breaks down, which supplies voltage to the backlight lamps. The lamps themselves can also fail, and this, in turn, provokes a breakdown of the power supply. In addition to the above malfunctions, it is not uncommon for a matrix or motherboard to break down. Also, the problem may lie in the loops, converter and decoder. In this case, non-working parts and elements will have to be replaced with new ones.

It is not recommended to carry out repairs on your own, since modern TVs are rather complex devices, and you risk aggravating the situation even more. The most correct decision would be to turn to professionals. This can be a service center of a manufacturing company or a private office, where repairs will be carried out efficiently and quickly.

One way or another, it is impossible to determine what is the reason for the breakdown of your TV without a thorough examination. In any case, the device must be disassembled and diagnosed for non-working parts and components. It is best if this is done in a workshop with the appropriate conditions, however, if this option is not to your liking, many telemasters provide all of these services at home.

Of course, replacing some parts can cost a pretty penny, but it should be noted that matrices or motherboards themselves rarely fail. Usually damage occurs as a result of physical damage to the part, for example, when the TV falls or gets wet. In general, you cannot do without a telemaster.

Now you know what to do if the TV has lost the picture, but there is sound. You will also understand what could be the reason for such a malfunction. Write in the comments if this article was useful for you, share with other users your experience in solving similar situations, and ask any questions of interest on the topic of this article.One of the most popular problems faced by the owners of smart TVs from the Korean company LG, when the image on the TV has completely disappeared, but there is sound. The symptoms associated with the transfer of content can be different:

The device speaks but does not show.

Unable to change channels due to black screen.

The backlight does not work.

The technique distorts the picture, turns it over and it becomes necessary to change the display format.

The TV shows dim and dim.

The broadcast on the display periodically disappears and the screen does not light up.

In this article, we will analyze what the causes of malfunctions may be, how to eliminate them, as well as what to do in each specific situation. Image - TV no image there is sound DIY repair

The most popular reasons why ice TV does not show digital and analogue channels are considered to be hardware faults. Problems with the power supply, or the color unit, a burnt-out inverter, breakdown of matrices and capacitors - all this can lead to the following:

Shows no gear.
Shows them in green or black and white.
Broadcasts an inverted image.
Other variations, when there is no video sequence, but the sound works (more on them later).

To solve problems when the screen does not show - the logo does not appear and subsequent broadcasts - a visit to a private master in a repair center or self-diagnosis and repair of a breakdown on your own will help.

If the sound comes at normal audio noise volume, but the screen remains dark, one of the diagnostic measures will be to test the cables transmitting the picture:

Antenna.
HDMI.
From your cable provider.
We check the availability of the Internet (in the case of digital set-top boxes from providers).

To do this, you need a special utility called Moninfo. It is designed to find some problems with the transmission of sound and video signals. If the application detects malfunctions, you should carefully examine the cable pins for damage.

Perhaps the most common reason why the image on an LG TV disappears is a matrix breakdown. Because of this, it starts:

jump video,
an afterimage is shown on half of the monitor,
there are stripes across the entire display (white, yellow, pink, or multi-colored).

As a rule, this TV part breaks down under the influence of external signs: moisture, strong shocks or falls. In such cases, the display cannot be repaired, and you will have to replace the matrix (or, as an option, buy new equipment). But if the malfunctions arose without visible prerequisites, for example, the picture began to bifurcate or "cloudy" abruptly, then they can be corrected in the technical service, without replacing the module with a new one.

Self-replacement of the matrix at home is also allowed, however, it will be very difficult for a layman to do this. The first difficulties will begin already during the preparation for the repair: it is rather difficult to get a suitable matrix, and it must be ordered from certified service centers. Otherwise, there is a risk of running into a fake and the work will be "down the drain."

Problems with capacitors in LCD TVs occur due to strong voltage surges in the network. External signs of a malfunction are manifested in this way: the display goes out and the transmission disappears immediately after switching on or after a short period of time, the broadcast is doubled, or the brightness disappears - the colors become darker. After disassembling the device on the board, you can observe a swollen or exploded capacitor, and the eternal companion of such a situation is a blown fuse.

Please note that after an overvoltage, it is the power supply unit of the equipment that breaks down very first. The complex of diagnostic procedures completely repeats the instructions from the previous section. As in the case, the electronics repair must be entrusted to an experienced craftsman so as not to harm the device and not completely break it.

The main signs by which it can be determined that the cause of the plasma malfunction was precisely the broken plume of the matrix, the following situations are considered:

The image periodically disappears on the TV.
The equipment stopped showing a normal picture - ripples and interference appeared.
Display distortions appeared: the screen began to strip or duplicate in any geometric order.

After contacting the service centers, there are two options for the development of events:

Repair of the loop.
Replacing a defective part of a part.

The first option disappears due to its inexpediency and complexity, since it is much easier to dismantle the breakdown and replace it with a working part than to try to repair the LG equipment. It is categorically not recommended to carry out any manipulations on your own.

One of the most popular reasons for this problem is the situation when the screen backlight does not work. In LV technology, failure of LEDs in LED backlighting is far from uncommon. It is determined quite simply - if the picture "blinks" and ripples, then the root of all evil lies in the faulty illumination of the polymer liquid crystal layer.

It is almost impossible to repair such a malfunction at home, if only due to the lack of necessary parts - ordering them from an official distributor is expensive and time-consuming, and unfortunately, such components are not supplied to the radio market. Therefore, the best option to fix the equipment would be to send it to a certified service center.

It is impossible to describe all possible malfunctions with a voltage inverter in an LCD device.

The image is flickering and distorted.
Video appears for a long time or does not appear at all.
After starting, the display of the device dims and goes out almost instantly.
There is sound, but the screen is dazzling.
The broadcast looks vague or so dark that it is impossible to make out what is happening.

This module is responsible for supplying energy to the backlight lamps, in addition to this:

Converts 12 volts DC voltage to high voltage AC;
Stabilizes the input current of the lamp to the required values;
Adjusts the brightness of the backlight;
Matches the output stage of the inverter with the input impedance of the lamps;
Protects electronic boards from short circuits and possible overload.

After a careful external examination and diagnostics of a broken inverter, someone who knows how to handle a soldering iron, a multimeter and has basic knowledge of physics and electronics will be able to repair it. It is difficult to say exactly where these parts most often burn out, since the problem can manifest itself anywhere: in lamps, transformers, "keys" or controllers on the board.

If there is sound on the LJI TV, but there is no image, while the picture is constantly twitching, it has become dim, displayed incorrectly or appears on the display with a delay, the problem is in the faulty power supply.

It is categorically not recommended to carry out manipulations without experience in repair and knowledge of electronics. It is better to pay money and call a TV technician who will quickly diagnose the breakdown and fix it.

But the initial inspection to detect problems can be done independently:

Discharge the capacitors - remove the plug from the socket (for the desperate - short-circuit it with any conductor). Open the back cover, check the cables for kinks and breaks, the functionality of the buttons and the fuse.
Inspect the power supply for swollen or melted capacitors or resistors. If any, they should be replaced.
Measure the voltage of the output circuits of the power supply. The values must match the numbers indicated in the documentation or on the board.
If the voltage differs and reaches a value of approximately 200V, it is necessary to look for the cause of the malfunction in the primary circuit.
If, when tapped, the TV reacts, video blinks or colors change, the source of the problem is poor soldering of modules or wires, and it is it that needs to be repaired.

This article has described all the possible situations and reasons when there is no image on the LG LCD TV. If the plasma technology works with sound without a picture, channels are not displayed on TV, the screen is dark, only the logo is lit, or it is impossible to watch movies, then the problem is most likely a hardware problem.To diagnose and purchase components for repair, you should contact the company representatives who assemble LG devices or repair points.

Irreplaceable author of our articles. Besides knowledge of his business, he is a great person. Knows many unusual facts about technology and electronics. For many years he has been repairing all types of electronic devices.

published articles - 54

readers - 11 578

on the site since December 15, 2017

There is no picture on the TV but there is sound: LCD malfunctions and their elimination, the reason is in LG, why it does not workPV connection with which there is no picture on the TV, but there is sound: 8 reasons Image - TV no image there is sound DIY repair

Breakdown often occurs when there is sound in the TV, but there is no picture Despite the fact that a wide variety of TV models are constantly on sale, which are literally considered to be improved relatively old design for watching TV, it is often necessary to encounter many problems. For example, there is no picture on the TV, but there is sound, a horizontal strip is displayed on the screen, or the plasma has failed due to high voltage. What to do in such a situation? It is worth familiarizing yourself with what malfunctions may be, why they arise and how to eliminate them.

The reason for a broken TV can be very different at times.

You can familiarize yourself with the main malfunctions in the operation of the TV yourself using the Internet

And more often than not, it does not work due to:

Malfunctions in the functioning of the control unit;
Burnout of the power supply;
Problems in a part such as a video amplifier;
Broken radio channel selector;
Malfunctions in the module responsible for the color in the pictures or in the sync pulse selector;
Chromaticity module breakdown;
Malfunctions in the vertical and horizontal scanning unit;
Breakdown of TV matrices.

If there are no independent skills in diagnosing a TV, then defects and malfunctions should be examined by a specialist with experience, relevant education and the necessary equipment. If the breakdown has no characteristic features, then the repair will not require serious investments. However, if a malfunction requires replacement of a part, and it is far from being cheap, then in some cases the masters completely recommend leaving the equipment for write-off to purchase new equipment, since the likelihood that the problem will not arise again is very high.

It is not difficult for an experienced specialist to find typical breakdowns, however, what to do if plasma TVs do not show the screen, but have sound? It is not always possible to independently determine why there is no picture, since LCD devices have a complex structure and many microcircuits, for the diagnosis of which special equipment and work experience are needed. The optimal solution is to contact the wizard.

Breakage can be of another type. For example, the TV turns on, and then blinks or goes out altogether. Regardless of the type and model of the device, diagnostics are needed, as this may indicate a serious malfunction.

Even well-known and popular brands of TVs may have a problem with no picture.

Owners of products of even such well-known brands as:

There are a number of reasons why the screen went out, but the TV has not stopped working and there is sound. The cord was disconnected from the socket, damage appeared on the wire, the inverter, which is responsible for supplying voltage to the lamp, failed, and it does not light up accordingly. There may be a malfunction in the matrix, system board, or backlight unit.

There may also be the following reasons: there are defects in the convector, the loop and decoder are damaged, the electrolyte in the power supply has broken, the electrolytic capacitor has become unusable. In CRT TVs, the frame and line scan may be damaged, or there is a disconnection of the loop and the matrix.

If there is sound when turning on the LCD TV, but there is distortion on the screen or it does not light up at all, then you can take a number of actions that can fix the problem. They need to be done carefully and only in accordance with the recommendations of specialists.

To find out the reason for the breakdown of the TV, you need to diagnose it

Diagnostics:

The quality of the connecting cable is checked. If it is damaged, it needs to be replaced.
On the back panel, you need to inspect where the cord connects to the socket.
Then the volume rises to the maximum, after which the device should return to normal operation.
All mechanical influences on the TV, even if they are insignificant, are strictly prohibited.
It is necessary to check the settings of the device for turning on and off the output and input channels.

If there are frequent power outages, install a fuse.

If horizontal stripes appear on the screen, cutting off half of the image, then you need to immediately search for this malfunction.

Dash color can be:

If you notice a horizontal strip on the TV screen, you need to contact the wizard for help.

Depending on the type of TV, the cause of this breakdown may vary. For CRTs, a horizontal strip indicates that there is a defect in the vertical scan, which may occur due to obsolescence of parts or with strong and frequent surges in voltage. Breakdown is not difficult to eliminate and can be done at minimal cost.

If it is an LCD TV, Plasma TV or LED/LCD and horizontal stripes are formed, this indicates a malfunction.:

Matrices;
TDKS;
Boards called T-CON.

In the first case, a complete replacement of the screen is required, but if it is possible to restore the operation of the device, then a lot of funds are needed. In this case, you need to decide whether to repair the device or buy new equipment in order to save money.

There are guidelines to help you avoid malfunctions with TVs such as:

It is categorically unacceptable for the TV to fall to the floor, as this will cause the device to turn off, and also major breakdowns will occur, which are not so easy to eliminate. It is very important to keep the equipment clean, as dust entering the device can clog the contacts, short circuit and overheat the loop.

It is strictly forbidden to get water inside the case. It affects the contacts and causes oxidation, which leads to loss of insulation and short circuits.

It is advisable that the TV is installed in a place where even minimal mechanical stress will not be carried out. It is best to install it on a wall using special brackets. It is not advisable to wet clean the TV, regardless of its type. The dust is removed with a vacuum cleaner.

As already mentioned, TV models can break down to the point of exception, be it: CW71A, EBR73575201, CW62C, MAX9590, TA8750AN.

It is worth noting that there are an incredible number of malfunctions that exist and can occur and can be attributed to them:

Ripples;
The process when the screen snows;
Lines that run vertically;
The TV beeps;
The screen has narrowed;
The tuner frame does not open on color screens;
The screen either goes out or is too bright, and others.

Using the Internet, you can independently familiarize yourself with common LCD TV malfunctions

There are also malfunctions that can occur exclusively in LCD TV. Breakdown of the matrix backlight circuit or, in other words, the TV inverter. The inverter is used to convert the low voltage that comes from the power supply to a higher voltage in order to ignite and keep the lamp illuminating the screen. Breakage can be of various types.

For example, after turning on the device, the screen becomes dark or immediately black, and partially, not completely. This indicates that it is not the picture that is disappearing, but the backlight is not working.

A breakdown of the power supply is possible, through which the voltage of each node in the LCD TV is provided. The power supply has several degrees of protection, which may not always work properly. If we consider malfunctions caused precisely by a defect in the functioning of the power supply, then such problems are possible as: inability to turn on the TV, not turning on or blinking the screen, turning on after a long delay, turning off on its own, the device does not respond to the buttons pressed on it or simply does not perform the task at hand, the image disappears.

The main module, which is responsible for controlling the entire TV as a whole, may break down. That it is defective says a lot. For example, the lack of functioning of such components as an inverter, a timing controller and a power supply. The main module board contains the central processor, converters, tuner device, temporary and permanent memory, as well as software. A malfunction in the main unit may manifest itself in the form of interference in the picture and difficulties in operating the TV.

Failure of the matrix or in other words the timing controller is considered a serious problem that requires immediate contact with the master. Due to the timing controller, the conversion is carried out, and the signal is supplied to the main board, which affects the quality of the reproduced image. Therefore, if the screen is covered with goose bumps, ripples and other defects, then you first need to start diagnostics from the matrix.

Video (click to play).

So, the diagnostic methods, depending on the breakdown, may be different, for example, to detect the return path of the beam, you need a special device, and to eliminate the crack on the screen, only a visual inspection and no more. The most important thing is that the non-working TV has an excellent master who can resume the work of the product quickly and without oversights.