No image on lg. Alice in Wonderland Alice in Wonderland: What to do if there is sound on your LCD or plasma TV, but no picture. Self-repair of LCD TVs Samsung, Elgie, Philips, Sony and other models, if not available

A TV is a fairly important piece of equipment in every person’s home. Like any other complex device, it may stop working for a certain reason. Breakdowns can be different, but the most common situation is when the TV screen suddenly starts flickering violently or simply turns off while watching. Of course, this can cause great concern for the owner of the equipment, but there is no need to worry too much. To begin with, it is important to install main reason, due to which the image on the TV disappears, but the sound works.

What situations might there be?

Picture and sound problems can be caused by many things. The most common problems faced by many smart TV owners include the situation when the image on the LCD TV disappears, but there is sound. Additionally, the problem may be expressed as follows:

the TV makes sound, but there is no picture;
I can’t change the channel normally due to a black screen;
the backlight does not function;
the technique leads to severe distortion of the image, changes its size, and leads to the need to change the image format;
The brightness of the screen deteriorates greatly, the colors become too dull;
The image transmission disappears from time to time and the TV screen stops lighting.

Before you begin to repair your device, it is important to accurately determine the cause of the malfunction and think through the course of your further actions.

What problems might arise?

Why does the picture disappear on my TV? The most common reason why the picture on the TV starts to fade and the sound disappears is a malfunction of hardware parts. Problems with the functioning of the power supply or color block, a burnt-out inverter, a broken matrix and capacitor - all this most often leads to the following problems:

all programs stop showing;
the color of the picture changes to green or black and white;
the image changes its position, flips, changes format;
Other types of problems may also arise when the video itself is missing, but the sound continues to function normally.

The TV has lost its picture - what should I do? To get rid of this problem, you should seek help from a private technician working in a repair center, or carry out independent search problem and its solutions.

Cable under test

If the sound from the device comes from the normal volume of the audio track, but the TV screen continues to remain dark, then the main solution will be to test the cable transmitting the image:

antenna;
HDMI 3;
from your cable provider;
checking the Internet connection (this must be done when the TV is equipped with a digital set-top box).

To carry out such a check, you will have to use the special Moinfo utility. It was created specifically to identify the main problems with the functioning of the device when transmitting video signals and sounds. If the application was able to detect malfunctions in the functioning of the device, then the owner should carefully inspect the cable contacts for any possible damage.

Problems with the matrix

Probably the most common cause If the image disappears from the TV screen or changes greatly, the matrix is considered to be broken. If the matrix is damaged, the following symptoms may be observed:

jumping picture;
the screen begins to show only half of the afterimage;
stripes start appearing all over the screen different colors or one (pink, white, yellow).

Most often, the matrix breaks under the influence of external factors, for example when accidental hit water, fall, strong impact. In this case, it will not be possible to repair the screen; you will have to purchase a new matrix (or even buy new TV).

If problems with such a part arose without specific reasons, for example, the picture itself suddenly began to become cloudy or double, then this condition can be corrected by technical service. Here the old module is replaced with a new, well-functioning one.

You can also replace the TV matrix yourself at home, but it will be very difficult for a non-professional in this field to do the replacement with your own hands. The first problems will arise already in the process of preparing for repairs: find correct model matrix for a specific TV is not easy, you will have to order it through official service centers cities. Otherwise, there is a high risk of purchasing a fake, which will only negatively affect the condition and functioning of the equipment.

Burnt capacitors in the device

Problems with the operation of capacitors in LCD TVs appear due to strong surges in network voltage. External signs of a breakdown may be the following: the image on the TV suddenly disappears and appears, the screen itself goes dark, the signal stops immediately after turning on the device or after a short period of time, the picture doubles or loses its brightness - darkening, dullness. After disassembling the TV, you can find a swollen or exploded capacitor on the board, as well as a blown fuse.

It is important to pay special attention to the fact that after recharging, it is the power supply that fails first. Diagnostic measures should be carried out in the same way as in other situations. should be carried out by an experienced professional who will prevent the situation from getting worse and not break it completely.

Problems with the matrix cable

The main signs by which you can understand that it is the matrix cable that has broken are the following manifestations:

from time to time the image disappears on the TV screen;
the device does not display the image normally - interference occurs, the monitor ripples greatly;
you may notice a distortion of the picture: large number stripes or doubling of the picture in geometric order.

After asking a specialist for help, he can suggest the following ways to solve the problem:

loop repair;
purchasing a new part.

The first method is considered labor-intensive and impractical, since it will be much easier to dismantle a broken part and replace it with a new one than to try to repair it. You should not try to cope with such a task on your own.

Backlight problems

Another fairly common reason for the image to fade on the screen is poor backlight performance. In LV devices, the LEDs in the LED backlight stop functioning normally. It will be quite simple to identify such a problem - the image blinks a lot, characteristic ripples appear on it, but the main problem is a malfunction in the illumination of the polymer liquid crystal layer.

It is almost impossible to cope with such a problem and repair the backlight on your own at home due to the lack of all the necessary parts. Ordering them from an official supplier is too time-consuming and expensive, and such spare parts are simply not supplied to the radio market. It is for this reason that the best solution is to send the broken equipment to a certified service center with experienced technicians.

Inverter burned out

It is simply impossible to describe all the reasons for the breakdown of the voltage inverter in a TV. The main signs of failure include the following:

Only someone who knows how to properly use a soldering iron and a multimeter, and also has at least basic school knowledge in electronics and physics, can repair a broken inverter on their own. It is difficult to accurately answer the question of where parts burn out most often, since the problem can arise anywhere: board controllers, lamps, and transformers.

Power supply operation

If there is still sound from the TV, but no picture, but the monitor constantly blinks, its color is dim, and the image is not displayed correctly or appears very late, then most likely the problem lies in the power supply.

Trying to repair the power supply yourself at home without sufficient knowledge of electronics and physics is prohibited, as this can only worsen the situation and lead to dangerous consequences. It is best to entrust this matter to a professional who will quickly identify the breakdown and repair it.

A professional always uses an integrated approach. You can’t just take it and fix the damage. First, you should determine the source of all troubles, then follow the instructions when repairing the broken area. Everything must be done strictly “according to the recipe”, because potential problems cannot be taken away later. The TV does not show an image due to system defects. Of course, it is possible to outline the circle of the most vulnerable, but, alas, this cannot achieve absolute accuracy of diagnosis. You always need to pay attention to the little things that affect the performance of the entire mechanism. To begin with, let's voice a list of signs of “disease” for TV repair, if obvious signs in the form of combustion of parts, or the expiration date of any part has not yet passed.

When you press the power button, you can hear a pulse going through, but there is no image.
Nothing happens after turning on the power.
In operating mode without video, only sound is heard.
The TV does not show some channels.
After turning it on, the picture is so bad that the image cannot be viewed.

And so, knowing the nature of the manifestation, you can begin to repair! It is worth starting with the area that ensures the functioning of the problem area. If we are talking about case number 2, then the first thing you should pay attention to is the power supply. In other cases, the problem is much more serious.

If qualified diagnostics is not a problem for the owner, then repairs can begin. Problem areas that have already been mentioned to me are the inverter, power supply, horizontal or vertical scanning units. If the model is old enough and contains a kinescope, it should also be examined. When installing a TV on a liquid crystal screen, like any plasma screen, problems often arise in the matrix, which is often due to exhaustion of resources or the human factor. Impacts on a faulty box only aggravate the breakdown, which is confirmed by the identification of faults where, in fact, they should not exist. High-tech plasmas (LCDs) are not designed to withstand physical deformation, be careful when handling such equipment. In case of incompetence, we advise you to refrain from interfering with the holy of holies of technology - the internal component. Call a specialist to your home, each of them is a specialist in urgent repairs. The advantages of this method of TV repair are not at all in the guarantee, not even in the speed and quality of the work performed, but, first of all, in accessibility. The services of professionals are aimed at helping people in a democratic, affordable price. They are a relief from unnecessary work and headaches for owners of broken models.

THE TV HAS A PICTURE, BUT NO SOUND

Became in lately The norm is that a high quality standard in the production of televisions is not a panacea for failures, problems and defects that sometimes arise in any electronics. What can we say if the users themselves rarely read the accompanying instructions for televisions, not to mention compliance with the operating conditions. The Soviet past taught many to do their own repairs, hitting the box in order to “improve the quality of work.” But this is fundamentally wrong, because today the products produced are technologically advanced, quite sensitive to any mechanical influences, so even one inept intervention in the body or a blow to it can create a lot of trouble for the owner. One of the existing signs of the human factor, as a rule, or a power surge in the network, is the absence of audio accompaniment to the video.

What to do if there is no sound on the TV?

As in the investigation of crimes, in our case it is important to establish everything down to the smallest detail: how did the malfunction arise, what preceded it, what was the nature of its manifestation? A specialist will need this information to accurately localize the source of all troubles on TV. This is also important when carrying out independent TV repairs. First, you should accurately determine the “broken” part. As practice shows, in 80% of cases the sound on the TV disappears due to three types of malfunctions. Let's take a closer look at each of them. The first is caused by malfunctions in the radio channel, damage to the effects processor and the entire mechanism is possible central processor, memory processing glitches occasionally occur. The second is a malfunction of the speaker, which is caused by wear, contacts coming off, or burnout. The third is the breakdown of microcircuits, and there are quite a few factors preceding this, starting with network outages, power surges, and ending with short circuits, failure of capacitors or, again, contacts.

Sound restoration instructions

But let’s return to the topic of the article and start taking action. Our first priority is to restore the sound supply on the TV; the source has been approximately identified, which means it’s time to repair it. Using tools, unscrew the housing and carefully remove it without touching the remaining blocks. We look at the details and visually look for potential breakdowns. If they are not there, we proceed to check the functionality of the circuits and blocks; if there are no responses, we pay attention to the contacts; even if they are connected, they may be “cold”, which means the circuit itself is not working. When such situations are detected, we change the circuit or try to debug it. Independent work It’s very painstaking and complex, so if you don’t want to delve into the technology yourself, call our technician to your home and repair your TV inexpensively. The guarantee will be the key to long-term and proper functionality of the equipment, and the quality of work will confirm the good quality of the assistance provided for many years. Over time, all clients remain more than satisfied and begin to use the services of our workshop specialists with pleasure.

Take advantage of the golden hands of the service center masters by calling a specialist to your home.

The very first televisions were so different from modern technology that there seems to be almost nothing in common between them. In fact general principles the work was preserved, and some TV malfunctions different models are repaired the same way. However, new causes of failure have also appeared related to the characteristics of the screen matrix, the design of microcircuits, and much more.

Trouble turning on or off

If the TV does not want to turn on, and the network connection indicator light does not even light up, then the problem is most likely with the power supply. It can burn out as a result of a strong voltage drop.

A similar reason may be when spontaneous shutdown TV. If overvoltage protection is installed, it can turn off the device at the right time. If you know that the voltage was stable, then you need to check the power supply and see motherboard whether microcracks have appeared in it.

No response to the control panel

This is a fairly common problem, but in most cases it is associated with a malfunction of the remote control itself. You may have dropped it or spilled something on it and it stopped working. You should also check the batteries to make sure that everything is fine with them.

It happens that the remote control has nothing to do with it, and the problem is a malfunction of the receiver remote control on the TV or a problem with the processor.

Memory problems

It happens that you want to tune channels and remember them, but nothing works. This may be due to problems with the memory device. A similar situation occurs when you adjust the sound, turn off the TV, and after turning it on, the settings are not saved. It will be necessary to check the memory chip and, if necessary, replace it.

Buttons on TV don't work

If you press a button on the TV itself, but no reaction occurs, then you need to check whether the contact connecting the button to the microcontroller is broken. If all contacts are intact, then you need to look for the reasons in the controller processor.

Sound problems

The sound problem is caused in most cases by some problem with the speakers. We need to check that they are turned on, connected, and that all contacts are intact. There are problems with the amplifier low frequencies, as well as with a sound processor. As a last resort, you need to look for a solution in the operation of the radio channel.

Poor or no image at all

It’s an annoying situation when the TV turns on and you can even hear sound, but there is no normal picture. The reasons for this can be very different, but they can almost always be solved. Whether you can solve them yourself or will have to call a specialist is another matter.

When the image is completely absent, but the sound is excellent, this may be due to a malfunction of the matrix or video amplifier.
The absence of a picture and periodic loss of sound may indicate that there are scanning problems.
If there is sound and the screen lights up but does not show anything, then there is some problem with the video processor. The cause may also be interference in the tuner.
It’s an annoying situation when the image only expands to half (bottom or top) of the screen. This indicates a malfunction in the matrix's vertical scanning. The vertical scanning module fails due to voltage surges and bad work power supply.
If a narrow vertical stripe appears on the screen, then something is wrong with the horizontal scan transformer; if the stripe appears horizontally, then there is a problem with the vertical scan.
The image has become monochromatic or one color has disappeared. This indicates that the video processor or video amplifier is broken.

Individual matrix malfunctions

In a modern TV, a matrix malfunction becomes big problem, which can only be solved by replacement. The matrix, in essence, is the screen, or rather, its main part on which the image is built. The reasons for matrix failure may be the following:

being hit by a hard object or falling;
moisture entering the matrix contacts;
manufacturing defect, electrical defect;
wear and tear resulting from long-term operation.

Due to damage to the matrix, images may appear on the screen. colorful stripes, black circles, the image freezes or is completely lost. Only a specialist can diagnose and replace the matrix, since there are many features of connecting and configuring the device.

Scanning problems

There are several indicators that indicate that there are problems with the frame scanning of the TV:

the image has become smaller or shifted vertically;
alignment is disturbed;
lines appear in the image indicating the reverse path of the rays;
there is no frame scanning at all, etc.

In the complete absence of frame scanning, one luminous horizontal stripe is visible on the screen. Usually all these cases of malfunction are associated with malfunction frame generator block. In the generator, the frame rate is set by capacitors, resistors, diodes, and transistors. If the TV has a kinescope, then the signal from the frame scanning unit is supplied to the deflection system. There may be problems with the contacts, or a breakdown in the deflection system may occur.

Only a person who is well versed in the TV's structure can fix problems with all these elements, so contact a service center.

From all that has been said, it is clear that most problems can only be fixed at a service center. With our own strength we can:

check if there is voltage in the network if the TV does not turn on;
check the antenna connector contact, whether it is connected well, try tuning other channels if the image is not of good quality;
if there is no sound, see if the headphones are plugged into the socket, unplug them, plug them in and out again, make sure the sound setting is correct;
replace the batteries in the control panel and check its serviceability.

Based on the signs that we described in the previous sections, you can determine how serious the problem is with your TV. After this, you can call a technician or take the device to a service center.

No image on the TV screen is one of the most common breakdowns of this type of equipment, regardless of models and brands.

There are many possible reasons for the image disappearing on the screen. Very often causes a malfunction no screen backlight.

Repairing the TV backlight is particularly difficult. Entrusting it to a non-professional is extremely dangerous. It is impossible to do it on your own, without the appropriate knowledge, experience and tools.

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

Two reasons for the TV backlight to malfunction

U quality TVs the image disappears after many years of flawless work. Unfortunately, cases when a new technique stops showing results happen no less often (if not more often).

It may not even be a year(!) before your TV breaks down if you are not lucky enough to buy low-quality equipment.

Most modern TVs LCD display with backlight LED (light-emitting diode). These are the models that dominate Russian market household appliances.

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- these are many small diode bulbs located in the TV behind the liquid crystal matrix.

Options for TV backlight malfunctions in total two:

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

It is not difficult to verify that the reason for the lack of an image is a faulty backlight. Point the flashlight at the operating TV screen. By applying forced illumination, you will be able to see the image.

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

Professional TV backlight repair

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

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

Dismantling boards- a very painstaking task that requires maximum concentration. 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 subsequently result in low quality images.

An experienced specialist will carefully remove:

T-con. Disconnect the cables and unscrew the bolts.
Metal protection from decryptors. Unscrew the fastening bolts on the sides.
The front frame 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.
Scattering film. First you need to unclip the latches and remove the plastic frame.
Reflector. Remove the locking clips.

After these steps, nothing will stop you from starting checking the TV backlight itself.

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

If there are no visible signs of scorch on individual diodes, you will have to check all LED bulbs.

First, power is connected to each row of LEDs. What ruler Not caught fire, there is a break and/or short circuit.

Afterwards, power is supplied in turn to each LED from the faulty line. Which LED doesn't light up, that one is faulty.

The lens is removed, and the faulty diode itself is desoldered (a soldering hair dryer is used for this). Then into place faulty LED solder a new one. The lens is glued to its original place.

TV backlight repair completed!

Afterwards, the technician checks the functionality of the backlight (voltage is supplied) and assembles the TV in the reverse order.

If the TV shows 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 driver in the power supply.

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

Did you know that some television equipment dealers specifically set the screen backlight level to maximum position in all modes to speed up the failure of LEDs and bring the hour of repair closer?

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

One of the most popular problems faced by owners of smart TVs from the Korean company LG is when the TV completely loses the image, but there is sound. Symptoms associated with content transfer may vary:

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 upside down, and it becomes necessary to change the display format.
The TV is dim and dim.
The broadcast on the display periodically disappears and the screen does not light up.

In this article we will look at what the causes of malfunctions may be, their elimination, and also what to do in each specific situation.

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

Doesn't show transmissions.
Shows them green or black and white.
Broadcasts an inverted image.
Other variations, when there is no video, but the sound works (more on them later).

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

Testing the cable

If the sound is coming If the audio noise level is normal, 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).

For this you will need special utility Moninfo. It is designed to find some problems in the transmission of audio and video signals. If the application detects failures, you should carefully examine the cable pins for damage.

Matrix failure

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

jump video,
is shown afterimage half of the monitor
There are stripes (white, yellow, pink or multi-colored) all over the display.

As a rule, this TV part breaks under the influence of external signs: moisture, strong impacts or falls. In such cases, it will not be possible to repair the display, and you will have to replace the matrix (or, alternatively, buy new equipment). But if problems arose without any obvious prerequisites, for example, the picture suddenly began to bifurcate or “go cloudy,” then they can be corrected by technical service, without replacing the module with a new one.

It is also allowed self-replacement matrices at home, however, it will be very difficult for a non-professional to do this. The first difficulties will begin already during preparation for repair: getting suitable matrix quite difficult, 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.

Burnt out capacitors

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

Please note that after an overvoltage, it is the equipment’s power supply that breaks down first. The set of diagnostic procedures completely repeats the instructions from the previous section. As in that case, electronics repairs should be entrusted to an experienced technician so as not to harm the device or completely break it.

Matrix cable

The main signs by which it can be determined that the cause of the plasma malfunction was a broken matrix cable are the following situations:

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

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

Loop repair.
Replacement of a faulty part of a part.

The first option is eliminated 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 strictly not recommended to carry out any manipulations on your own.

Backlight

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

It is almost impossible to repair such a problem at home, if only because of 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. That's why the best option repair the equipment, it will be sent to a certified service center.

The inverter burned out

Describe all possible malfunctions with a voltage inverter in an LCD device it is impossible.

Symptoms:

The image flickers and becomes distorted.
The video appears for a long time or does not appear at all.
After startup, the device’s display dims and goes out almost instantly.
There is sound, but the screen ripples.
The broadcast appears blurry 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:

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

After a careful external examination and diagnosis of a broken inverter, it can be repaired by someone who knows how to handle a soldering iron, a multimeter and has basic knowledge of physics and electronics. It is difficult to say exactly where these parts most often burn out, since the problem can appear anywhere: in lamps, transformers, “switches” or controllers on the board.

power unit

If there is sound on the LGI TV, but there is no picture, and the picture constantly jerks, becomes dim, is displayed incorrectly, or appears on the display late, the problem is a faulty power supply.

It is strictly not recommended to carry out manipulations without experience in repair and knowledge of electronics. It’s better to pay money and call a teleworker who can quickly diagnose the problem and fix it.

But you can carry out an initial inspection to detect problems yourself:

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, and check the functionality of the buttons and fuse.
Inspect the power supply for swollen or melted capacitors or resistors. If there are 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 is different and reaches a value of approximately 200V, it is necessary to look for the cause of the malfunction in the primary circuit.
If the TV reacts when you tap, the video flickers or the colors change, the source of the problem is poor soldering of modules or wires, and this is what needs to be repaired.

Ask a question to a virtual expert

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Conclusion

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