Modern TVs are reliable and functional devices. However, even they are prone to breakdowns. Users especially often complain that the image on the TV has disappeared, but there is sound. In this article we will look at the key reasons, how to fix them, and what to do in a particular case.
- Some useful tips
- In conclusion
Main reasons
The problem is common, in some cases you can even deal with it yourself. The most common reasons when there is sound, but no picture on the TV:
- cable problems;
- power supply failure;
- problems with the color block;
- the matrix has failed;
- the inventory burned out.
To restore the image, you need to diagnose the breakdown and carry out repairs. Of course, you can contact the service center. The technicians will fix the problem, but the price of their services will be very high.
Checking the cable
If the TV with Smart TV does not show an image, but there is sound, you need to carefully check the wires transmitting the image:
- HDMI.
- Antenna.
- Wire from the provider.
- Plugs.
Checking the integrity of the TV cables
We carefully check all connectors and the integrity of the wires. We take out the plug and check the contacts. If sound appears, but the image is bad and constantly disappears, then you need to check the antenna.
Matrix problems
A common problem why the image on the TV disappears, but the sound works is when the matrix is broken. Signs:
- the picture jumps;
- the video is displayed on half the screen;
- stripes of different shades appear.
The matrix fails mainly due to careless actions of TV owners - an accidental fall or a strong blow. A complete replacement of the part will be required; in some cases it is better to immediately purchase a new TV. The cost of replacing the matrix on some Samsung models will be comparable to the price of new devices.
If problems arose without any prerequisites, for example, the picture began to double or the image quality sharply deteriorated, then repairs are possible without replacing the entire module.
Problems with the TV matrix
It is impossible to repair the matrix yourself without the proper skills. Already at the preparation stage, serious problems will arise, since it is very difficult to find the necessary spare parts. They will need to be ordered from specialized stores, but choosing the right one will not be easy.
Capacitor burned out
Capacitors are unstable to strong voltage surges, so they fail with enviable regularity. The defect appears like this:
- Suddenly the screen goes black.
- After a few minutes of operation, the broadcast disappears.
- There are problems with brightness.
An example of a burnt capacitor
If you remove the back cover of the TV and look at the board, you will see swollen capacitors. In special cases it may even explode.
Usually, a fuse burns in parallel with the capacitor. When diagnosing, it needs to be checked. It is best to entrust the replacement of the capacitor to a specialist.
Testing the matrix cable
When your LG TV has sound but no picture, inspect the matrix cable. Most often, the following points indicate its breakdown:
- periodic disappearance of the broadcast;
- the image ripples, interference appears;
- Various screen distortions appear.
No one will repair the cable; it is much easier to completely replace it. It is impossible to repair the element yourself. The cable is a fragile part and can be easily damaged.
Backlight
If the backlight lamps are broken, it is very easy to check. We turn on the TV in the darkest room possible, and shine a flashlight closely into the monitor. An image should appear in the place where you shine the light.
Backlight lamps for TVs in a very wide price range. They can cost very little or very much. It is unlikely that you will be able to replace this part yourself, so once you have determined the reason, feel free to contact the service center.
What to do with the inverter
If your Samsung, LG, Sony or any other model does not have a picture, but there is sound, the inverter may have failed. This breakdown has too many signs:
- the broadcast is distorted;
- sound appears immediately, but the image appears only after a few minutes;
- the picture is too dark, it is difficult to see what is happening on the screen;
- There is a constant ripple on the screen.
After a detailed inspection and diagnosis of a failed inverter, any person who knows how to use a soldering iron, a multimeter and has knowledge of electronics can repair it.
power unit
If, when connected to power, sound appears on the TV, but the broadcast does not or appears with a significant delay, the breakdown must be looked for in the power supply. First of all, you need to carefully inspect it and only then make a decision about repairs.
- We remove the back cover, check all the wires for creases, and inspect the fuse.
- We find all the capacitors and check if they are swollen. If any are found, they need to be changed immediately.
- Test voltage. The obtained parameters must match those presented in the documentation for the TV.
- The TV reacts to minor taps, the image jumps, colors change - you need to check all contacts.
TV power supply
If there are no visible defects, then you cannot do without the help of a specialist.
Mystery TV Repair
Mystery TVs appeared on the Russian market relatively recently, already in the era of development of LCD television technologies. Not very many CRT (picture tube television) models were produced; they have not been available for repair services for a long time, so there is no need to consider them within the framework of this article. The history of the creation of the Mystery brand is quite vague. Many trading companies refer to audio equipment manufacturer Mystery Electronics, which was allegedly founded by two American businessmen in China. In reality, Mystery TVs are produced in Russian assembly shops in Kaliningrad and the region from cheap components and modules of Chinese origin, like all their similar counterparts from the low price category, such as SUPRA, Techno, Fusion, Rolsen, etc...
For repairmen, Mystery TVs do not create significant difficulties, and the necessary parts or units for replacement are purchased in wholesale and retail sales in Russia and China.
Modern LCD and LED Mystery TVs are assembled on the basis of some Chinese standard board (Main Board) based on a multifunctional processor combined with a video controller (scaler), usually from the Micro Star developer. There are quite a lot of varieties of such boards produced in China. All of them are capable of working with HD or Full HD LCD television panels with the appropriate software. Some types of Main Board for LED TVs may include a backlight LED power converter and a general power module. That is, they are made in the form of a single monoblock, where control and power elements are located on one board. Sometimes the power supply can be supplied as a separate device in the form of an adapter and is issued when sold complete with the TV.
Typical malfunctions of Mystery TVs
A popular problem among this category of TVs is a software glitch. This usually happens due to the use of low quality memory chips from the manufacturer Winbond.
External manifestations of a failure in the Software: The indicator on the front panel of the TV is constantly on (usually indicating standby mode), does not respond to the remote control and functional control buttons, there are no other signs of operability. The software and memory chip need to be replaced. Similar external manifestations can be caused by other malfunctions, for example, those related to the power supply of microcircuits on the Main Board, or even a defect in the control processor.
Malfunctions in the power circuits of the power supply or inverter usually look different in appearance, for example, no control indicators on the panel light up, or the indicator blinks. The image may be missing or appear only when turned on...
The most popular manifestations of power supply malfunctions: The TV does not turn on and the indicator lights do not light up, there are no sounds or signs of turning on. Most often in such cases the power module is faulty. When using an external adapter, even the TV owner himself can check or replace it. In this case, it is necessary to comply with the input and output parameters indicated on the sticker. Repairing a power supply is quite complicated and requires the technician to have appropriate qualifications and knowledge of the circuitry of modern flyback voltage converters. Forward converters are practically not used in this category of TV, especially in adapters. Devices with power consumption exceeding 100 watts by conventional standards use more complex power supplies using a Power Factor Correction (PFC). They are usually installed in LCD TVs with screen diagonals of 32 inches or more, and with LED backlighting of more than 40 inches.
Malfunctions of the display backlight: There is no image, the screen is black, there is sound, with reflected light, sometimes image elements in contrasting areas are faintly visible. The inverter - the power converter for lamps or LEDs backlighting the LCD panel (matrix) - may be faulty. With the same symptoms, the LEDs or lamps inside the panel may be faulty, which can only be replaced in a hospital setting. Disassembling the panel at the customer's home is strictly not recommended.
If the sound is lost only on analog channels, you must first make sure that the sound system is correctly installed D/K (6.5 MHz) Russia Eastern Europe or B/G (5.5 MHz) Western Europe. If there is no sound on all channels and from external sources, there is a possibility that the audio amplifier chip is faulty.
Mystery LCD models popular for repair
The most popular Mystery TV models for repair, backlit with CCFL (EEFL) lamps, discontinued from production, are still in use. We list them in a list with the opportunity to see details and prices for repairs by clicking on the model link:
MTV-1603W, MTV-1605W, MTV-1607W, MTV-1608W, MTV-1703, MTV-1903W, MTV-1904W, MTV-1905W, MTV-1906W, MTV-1907W, MTV-1916WD, MTV-1917WD, MTV- 2204W, MTV-2205W, MTV-2206W, MTV-2207W, MTV-2208W, MTV-2215WD, MTV-2216WD, MTV-2217WD, MTV-2218WD, MTV-2225WD, MTV-2403WH, MTV-2407WH, MTV-2408WH, MTV-2417WD, MTV-2602W, MTV-2605W, MTV-2606W, MTV-2607W, MTV-2616WD, MTV-2617WD, MTV-3204W, MTV-3205W, MTV-3206W, MTV-3207W, MTV-3208WH, MTV- 3209W, MTV-3210W, MTV-3212W, MTV-3704W, MTV-4203WH, MTV-4205WH, MTV-4207WH.
Popular repair models of Mystery TVs with LED backlighting. Details about repair prices are at the link below:
MTV-1611LW, MTV-1614LW, MTV-1911LW, MTV-1913LW, MTV-1914LW, MTV-1918LW, MTV-1922LW, MTV-1929LT2, MTV-2211LW, MTV-2214LW, MTV-2218LW, MTV-2222LW, MTV- 2223LT2, MTV-2224LT2, MTV-2228LT2, MTV-2229LT2, MTV-2231LT2, MTV-2411LW, MTV-2418LW, MTV-2429LT2, MTV-2429LTA2, MTV-2430LTA2, MTV-2431LT2, MTV-2611LW, MTV-2 622LW, MTV-3012W, MTV-3018LW, MTV-3028LT2, MTV-3211LW, MTV-3213LW, MTV-3217LW, MTV-3218LW, MTV-3222LW, MTV-3223LT2, MTV-3223LW, MTV-3224LT2, MTV-3226LT2, MTV- 3228LT2, MTV-3228LTA2, MTV-3229LTA2, MTV-3230LT2, MTV-4018LW, MTV-4022LW, MTV-4026LT2, MTV-4028LT2, MTV-4029LTA2, MTV-4030LT2, MTV-4031LTA2, MTV-4128LTA2, M TV-4129LT2, MTV-4829LTA2, MTV-5031LTA2.
Mystery TV repair in St. Petersburg
St. Petersburg, Bolshevikov Ave., 3, building 1.
Some useful tips
In a situation where there is no image, but there is sound, you can take the following actions:
- Turn off and turn on the TV after a few minutes. There may be a system failure.
- We check the antenna cable connection and connectors. The wire may have broken.
- Raise the volume to the limit. Usually after such actions the TV begins to work stably.
- If there are constant power surges in the network, install an uninterruptible power supply.
Use the TV carefully to prevent mechanical damage and accidental exposure to moisture.
There is no picture on the TV, but there is sound - how to fix the problem
Nowadays, it’s rare for a person to live without a TV. Every year, models become thinner, larger and offer more and more new functionality. Modern plasma panels with Smart TV technology have little in common with the devices that were sold just ten years ago. However, the old and new generations still have something in common - breakdowns and malfunctions still happen. The reasons for this can be very different: impacts, falls, exposure to moisture and direct sunlight, or simple defects. In this article we will look in detail 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 susceptible to this: Samsung, LG, Philips, Sony, Panasonic and many others. Therefore, there is no point in blaming 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 will 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 (LG, Samsung, Philips, etc.) first appears, after which the screen simply goes blank. In this case, you can switch channels and hear the sound. Some users have noticed that after a while the image appears, but when turned on again, everything repeats and the image is missing. In this case, try the following tips:
- Check the receiver cord connection as it may have become disconnected. Make sure the cord is connected securely. If there is no video signal from the set-top box, many TVs simply turn off the screen.
- The problem may also be in the cable itself. The wire may be damaged or simply be of poor quality. This applies not only to HDMI cables, but also to cables with bells. In them, the transmission of audio and video signals occurs through separate wires, and the problem may simply lie in a broken wire or poor contact. 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 - increase the volume to maximum (or close to it). After a few seconds the image will appear and then you can set the volume to an acceptable level.
Please note that all the above tips will only help if the screen is working. This is indicated by the screen saver when you turn on the TV. If there is no screensaver and the screen is constantly dark, this already indicates that some component of the TV responsible for the image has failed.
There are several components, the failure of which can cause the absence of a picture on the screen. Quite often there is a breakdown of the inverter, 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 malfunctions listed above, failure of the matrix or system board often occurs. The problem may also lie in the cables, 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 yourself, since modern TVs are quite complex devices, and you risk aggravating the situation even more. If the simple tips given above did not help, then the best solution would be to turn to professionals, since the TV will need to be disassembled. This can be a service center of the manufacturer or a private office, where repairs will be carried out efficiently and quickly.
One way or another, it is impossible to determine the reason for the breakdown of your TV without a thorough inspection of it. In any case, the device must be disassembled and diagnosed for non-working parts and components. It is best for this to be carried out in a workshop with appropriate conditions, however, if you do not like this option, then many telemasters provide all these services at home.
Of course, replacing some parts can cost a pretty penny, but it should be noted that the matrices or motherboards themselves rarely fail. Typically, failure occurs as a result of physical damage to the part, for example, when the TV falls or gets wet. In general, you can’t do without a telemaster.
Now you know what to do if the TV has lost the image, but there is sound. You will also understand what could be the cause of such a malfunction. Write in the comments whether this article was useful for you, share with other users your experience in solving similar situations, and ask any questions you have about the topic of this article.
