There is sound on the TV, but there is no image - what to do, reasons and solutions, repair

The causes of breakdowns on CRT and plasma TVs are often different.

CONTENT

1 Diagnostics of the TV, if the image disappeared while saving sound
2 What to do if there is sound, but there is no picture for certain types of problems
3 Simple actions that you can do yourself

Diagnostics of the TV, if the image disappeared while saving sound

The problem of a broken picture on TV is found in almost all brands of TVs: Samsung, LG, Philips, Sony and others. In this case, it is important to correctly diagnose the problem. Having done this, it remains only to make a competent repair. It is on the accuracy of finding out the reason that the effectiveness of further service depends.

Self-diagnosis TV

All an amateur can do when revising his own TV is to visually inspect all the significant details. It is also allowed to disassemble the unit and clean it. At the same time, carefully look at the state of the boards. Often, the problem is found in capacitors. However, it is worth noting that self-intervention in the device can completely disable the TV. Therefore, it is better to entrust the matter to a professional.

It is not recommended to apply aggressive tools to the TV to solve the problem of no picture.

Professional diagnostics of the internal structure of the TV

If specialists are engaged in the study of problems, then, for sure, they will quickly determine the problem by calling all contacts, significant parts and adhesions on the boards. In addition, by calling a professional for diagnostics, the owner of the TV will receive a guarantee of high-quality work performed. Wizards carry out troubleshooting with a special tool and often find the problem in the first few minutes.

It is necessary to work with the internal parts of the TV only when it is disconnected from the electricity.

What to do if there is sound, but there is no picture for certain types of problems

When a TV turns into a radio, it's frustrating to say the least. However, in order not to aggravate the situation, this malfunction must be fought. As a rule, repairs are done after the problem has been clarified. Consider in which cases intervention is required and how it is performed.

If there is snow on the screen, then perhaps this is due to the lack of a signal on the program.

Network problems

If there is no image on the TV screen, then, first of all, this may be due to a poor Internet connection (typical for those cases when a movie is viewed over the Internet). Also, the loss of the picture on the TV may occur due to insufficient Wi-Fi signal.

The lack of an image is often associated with low Internet speed or lack of connection to it.

Partial disconnection or complete damage to the cable

Loose connection of the cable to the sockets of the TV, just, can lead to loss of image, but not sound. To make sure of this, experts recommend, with the TV turned off, pulling out and reinserting the plugs of the antenna wires and the electric cable into the connectors.

If the video signal is lost, you must try to restart the set-top box, check the strength of the connection of the HDMI cable or the wire that synchronizes the two devices. Usually, the problem is solved by replacing the docking cable.

A small break in the wire can be eliminated with your own hands if this did not happen in the connector housing.

If the electrical wire connector is "loose", it must be changed urgently. Even the slightest damage to the cable insulation is dangerous for future use. This threatens not only with the closure of the contacts of the TV, but also with human injury.

Inverter failure

Usually, owners of TVs of brands Samsung, LG, Sony, Sharp and others face the problem of inverter breakdown. Signs of this are: severe screen distortion. The sound may appear immediately, but the image may be delayed by several minutes. You can repair the inverter with a soldering iron and knowledge of electronics. It is important to perform a careful and competent solder here.

The inverter is a large board with many parts. Only a specialist can determine what is broken on it.

Power supply failure

This problem often has similar symptoms as an inverter breakdown. However, here you need to ring each contact on the board. Step by step you need to do the following:

remove the case cover, and then carefully inspect the integrity of the wires, the presence of kinks and visible damage to them;
pay attention to the capacitors. It is imperative that there are no swollen parts (they can further burst and harm the TV);
we test the voltage with a special tool. It should not deviate from the norm specified in the documentation for the TV;
it happens that TV reacts to various kinds of tapping. This indicates a poor contact in the power supply, so the contacts must be carefully checked, and, if necessary, better connected.

In the TV power supply, problems with built-in capacitors often appear.

Ideally, it is better to replace the entire power supply. But, it will cost less than a new device.

GOOD TO KNOW!

It is recommended to check the TV in the switched off state. It is allowed to turn it on only if each part is replaced one by one. However, do not abuse frequent downloads!

How to liven up an image on a TV if it is not there, but there is sound

Breakdown of the television matrix

Matrix malfunction is considered the worst problem. To replace it, you will have to prepare an impressive amount for repairs. Sometimes, it's better to get a new TV. A defect in the matrix can occur in the event of careless actions of the owners: blows, damage, indentations. Less commonly, equipment breaks down due to a factory defect. You can detect such a problem by a jumping picture, an image on a half-screen, or the appearance of vertical stripes of various shades.

When the matrix breaks, a clear dent is visible in the place of damage, moreover, the image is completely absent.

Damage to the video processor

A breakdown of the video processor can manifest itself gradually or at once. Often it is accompanied by the following symptoms:

the appearance of color distortions and incorrect display of shades;
the disappearance of one of the flowers;
the sound can be accompanied by image deceleration or just a blue screen.

A melted video processor can pull along the breakdown of other parts of the TV.

This problem is easier to solve by replacing the video processor with a new one.

Backlight unit does not work: main symptoms

You can only suspect a backlight malfunction if the screen does not respond to the picture in any way. At the same time, the sound is heard well. Here you can try to carry out your own diagnostics. To do this, you need to turn on the TV at night or move it to a dark room. Then bring the flashlight close to the screen and turn it on. In the place where the rays of light fall, a small image with contrasting squares will appear. To replace the part, it is better to contact the service center.

In the backlight unit on the TV, each lamp should be lit in working order.

Partial or complete deformation of the train

The cable is located on the matrix, and it easily breaks down after frequent careless transportation of the TV, as well as in the case of prolonged use without maintenance. To determine this problem, the following signs will come to the rescue:

periodic appearance of horizontal stripes in the middle of the screen or in some of its sections;
ripples and interference with a high-quality digital or analog signal;
duplicating the screen in any order or jumping a thumbnail image from one zone to another.

In case of contacting the repair center, the craftsmen will completely replace the part or re-solder the existing loop. Actions are performed depending on the desire of the owner of the TV and the availability of funds for repairs.

Loop damage is only possible if worn or deliberately damaged.

GOOD TO KNOW!

In the case of a partially missing image, you may suspect that some screen colors have burned out. This usually happens when the TV is installed in a location where the screen is exposed to direct sunlight.

Distortion of the image in the event of a malfunction of the line or frame scan unit

Often such damage can be observed in modern CRT TV brands. To check this, you must first diagnose the lowercase and then the frame scan.

Frame scan often suffers on CRT TVs, but it can also be found on LCDs.

In the first case, it is necessary to revise the output transistor, stage and line transformer with a multimeter. This is how the breakdown of deflecting line coils is determined.

In the case of checking the frame scan, it turns out that the power supply of the master oscillator is working, checking for a break in the rectifier diode, as well as studying the frame scan microcircuit.

Convector malfunction

A similar defect occurs when the image is absent only on some channels. It may not appear either independently or together with sound. If the rest of the programs are working as usual, then it is precisely in the antenna convector head.

If the antenna is in the open air, it is better to cover the joints of the plugs from moisture.

Make sure that there is no maintenance on these channels, and then go to the "Keys and frequencies" menu or to the properties of the satellite dish and determine which satellite serves it. Thus, it will be possible to find out which head is to be replaced.

For the correct setting of the signal, it is necessary that all convectors are directed to the satellite in the appropriate degree.

It makes no sense to repair this part, therefore, it is better to contact the nearest radio store and purchase a new convector.

Damage to TV decoders

The presence of wide stripes on the TV screen speaks precisely of the breakdown of the decoder. Or it happens when the loop contacts are dysfunctional. Usually this situation requires a complete replacement of the entire hardware interior of the TV. In this case, it will be cheaper to buy a new device.

The breakdown of the decoder is often accompanied by a split screen.

Swelling of the capacitor case: ways of repair

The failure of the capacitors on the internal board of the TV is accompanied by the loss of the image on the monitor of the receiver. Usually the sound works at full strength, but the image is not visible immediately after starting the device. What can we do to diagnose:

Open the back of the TV and take a close look at all the capacitors.
It is imperative to check the capacitors by touch, since the visual defect may not be noticeable.
If swollen parts are found, it is recommended to replace them with new ones. You can buy analogs in a radio store, just remember exactly the TV model.

A swollen capacitor often affects not only the image, but also the ability to operate from a remote control.

Capacitor breakdown often occurs with sudden voltage drops. Therefore, in order to protect your TV from damage, it is better to buy a special filter and stabilizer.

The capacitor power must be sufficient, so it is better to take a picture of the board, and then go to the store for details.

Simple actions that you can do yourself

If you find a problem with the breakage of the TV screen, you can perform some manipulations that will probably help solve the problem if it lies on the surface.

Try turning off the power of the TV and restarting after a few minutes. If a software failure occurs, then the TV will be restored.
We are trying to reconnect the antenna cables to the connectors on the back of the TV. Perhaps there is a defect in the wires or plugs somewhere.
If the image is lost when trying to connect any other electrical appliance, then the problem is in power surges. This is an excuse to purchase a stabilizer.
If there is no picture on the TV, turn the volume up to the limit for a few seconds, and then return it to the desired range. After a few minutes, the image will appear.

Remote control may not be available if the screen is damaged, so sometimes you have to play with the buttons.

In today's publication, we have analyzed in detail all the reasons for the inoperability of the image on the TV. If you still have questions or you had to carry out repairs yourself, write in the comments and share your opinion.

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