Samsung TV repair do it yourself no image

Samsung has long been one of the most popular brands sold and serviced in Russia.
The choice of buyers is justified by the favorable price-quality ratio of the equipment, and the popularity among repairmen is due to many factors that determine the simplicity and ease of repair and maintenance.

Despite the variety of models, Samsung TVs for technicians and service engineers remain uncomplicated and predictable in repair, and the manufacturer's timely technical support with components, modules, documentation and software greatly facilitates and simplifies diagnostics and repairs.

Since the beginning of the nineties of the last century, the craftsmen have accumulated rich experience in repairing Samsung TVs, which was discussed and preserved on the Internet in numerous conferences and blogs of repairmen.
Typical defects of some models sometimes caused controversy and deserve special attention in considering the causes of malfunctions and methods of their elimination.

In this series of articles, it is planned to consider the most common malfunctions of Samsung CRT TVs from 2000 and the most popular LCD TV models in the practice of repairing.

There is no need to consider the problem of electrolytic capacitors in the rectifier filters of power supply modules here, since this is a massive trend characteristic of the first generation of LCD TVs. It should be noted that in LED TVs, the problem with electrolytic capacitors is less common. Perhaps this is due to the lower consumption of LED backlight power converters.

Operation of some first generation Samsung LCD TVs with defective power filter capacitors may cause software failure. At first, the settings for the channels may disappear, sometimes specific distortions appear in the “Cinema” mode, the screen backlight adjustment may not work correctly.
Often there is a complete failure in the software and the TV is no longer included in the operating mode.
In such cases, after repairing the power module, it is necessary to replace the contents of the EEPROM memory.

One of the most popular power supplies in repair is described separately in the article Typical faults BN44-00192A. In addition to defects caused by a malfunction of electrolytic capacitors, we note two more typical malfunctions of this module. Ring cracks in the soldering of the terminals of the switch-on transistor from standby mode, as well as breakdown of the sealant with subsequent short circuit and damage to the 2200pF capacitor and breakage of the 0.22 Ohm resistor in the power supply circuit of the key transistors of the converter.

Noise in the image in the form of curved oblique stripes associated with poor filtering of the tuner's power supply is eliminated by replacing the 100uF 16V capacitor on the main board. In this case, there is no need to change the capacitor in the tuner. Sometimes the masters do the opposite, due to insufficient competence, then such a replacement will help for a short while.

Another popular typical malfunction of some Samsung LCD models is the use of the AS-15 gamma correction chip in the T-CON board. AS19. The defect is associated with distortion of color transitions. The image becomes lighter and in places looks like a negative.

The latest LCD models, in particular the SMART-TV, have problems with BGA soldering technology for highly integrated chips.In such cases, malfunctions may occur, usually manifested with warming up, which are caused by a violation of the contact of the chip pins with the corresponding pads on the board.

The malfunction of the LCD matrices is perhaps a separate topic for discussion, but it makes sense to briefly consider some of the external manifestations of its defects.
In most cases, these are straight vertical stripes in certain areas of the screen or throughout its entire area. Stripes can be different, both colored and black and white of different thickness.
Sometimes the nature of the stripes changes with external mechanical stress. Freeze-frame images may appear.
Such matrix defects are associated with broken contacts in the connections of the loops, which can sometimes be restored with warming up.
Repair of the matrix in such cases is associated with its disassembly and restoration of contacts in loops or duplication of connections with external conductors - a complicated process, not recommended by manufacturers and may not always be a successful and reliable solution to the problem.
Due to the fact that the price of the matrix is ​​quite high, it is more than half of the cost of a TV, in most cases, owners of post-warranty TVs refuse to replace the matrix due to the economic inexpediency of repair.

In many models of LED TVs of the 5 series, panels (matrices) with backlight LEDs of sufficiently low quality are installed, or the current in the LEDs is incorrectly calculated. This currently popular typical defect can manifest itself already in the first year of operation. In this case, there is simply no picture.
In authorized service centers, on the recommendation of the manufacturer, they change the LED rulers and limit the current in the LED drivers so that the TVs work out at least the warranty period. And in post-warranty cases, this problem is solved by the craftsmen in different ways, depending on their qualifications and contractual conditions with the owner.
Some explanations and recommendations can be found in the article in our article Repair of Samsung, LG LED-backlights.

Of the most common malfunctions of Samsung CRT TVs, there are several associated with the low reliability of CRTs and their deflecting systems (OS).

The consequence of shorting the filament with the cathode of the kinescope (usually green) is eliminated by isolating the filament from the mass and organizing its separate power supply (2-3 turns per TDKS core). In this case, do not forget to use the standard filament current calibration resistor.

In kinescopes with a flat screen, diagonals of 20 inches and more, a short circuit between the accelerating electrode and the modulator (G2 and G1) often occurs, which is accompanied by the absence of an image.
Fortunately, such short-circuits, in most cases, can be easily eliminated by the usual old-fashioned methods popular among repairmen.

It is more difficult with a short circuit in the lower case deflecting coils of the CRT. At the same time, the line transistor short-circuits, usually immediately upon switching on. In some cases, you can see smoke from under the throat of the OS, feel the characteristic smell, the transistor (HOT) overheats at this time.

A lot of trouble in many models of Samsung CRT-TVs of different diagonals is delivered by the elements of the IOC capacitive divider of the horizontal sync pulse formation circuit. In such cases, the limiting resistor often burns out to charcoal, sometimes damaging the board section along with the conductive tracks.

In cases with “floating” defects, when it is not possible to detect poor contact in the soldering of the element leads, it is necessary to remember the specificity of the metallization of the holes in the power circuits of the horizontal scan, which is characteristic of Samsung CRT TVs.
The contact of the metal sleeve with the copper pad of the board is often painted over, sometimes it is faster to detect sparking in this place than to see an annular crack with a magnifying glass.
Most often, such a breakdown of contact occurs at the place of soldering of the contact pad with metallization of the collector connection of the line transistor.

Typical malfunctions of some common models made on standard chassis can be considered separately.
Pages will be added as the material is prepared.
Typical defects and repair of Samsung chassis KS1A - From the practice of repairing Samsung KS1A TVs.
Typical defects and repair of Samsung chassis KS2A - From the practice of repairing Samsung KS2A TVs

According to the functional composition of CRT (with a kinescope) and LCD (LCD) TVs, separate sections have been created on the site, where modules and elements for well-known and popular models for repair are indicated in the tables:
Composition of Samsung CRT TVs - Functional composition of Samsung CRT TVs.
Composition of Samsung LCD TVs - Functional composition of Samsung LCD TVs.

Some useful recommendations for owners who decide to buy a new TV due to the unrepairability of the old one can be found on the page: how to choose a TV when buying.

Comments and suggestions are welcome and welcome!

Hello! Samsung TV UE32H5303. The image disappeared, before that there was a small flash on the screen and it went out, but the sound remained. Channel switching is. What is the reason? Physical damage, water ingress are excluded. Best regards, Svetlana.

It is forbidden to write answers that do not bring any benefit to the questioner from the series: “bring it to the service”, “contact the ASC”, “unprofitable”, etc. Answers like these will be considered a rating cheat, the answers will be deleted, and the account will be blocked.

If you undertake to help people, answer fully. Explain why, if you recommend, for example, reflashing your phone, then write how to do it. If you write that repairs are unprofitable, explain why.

Most likely, the backlight controller is out of order, it can only be treated with a complete replacement of the backlight board.

Recently, the TV in the kitchen Samsung CS-14F2R broke down quite unexpectedly. At first, this caused a feeling of similar joy - he had been behaving disgustingly for a long time and often there was a desire to throw him off the second floor, replacing him with a new one. However, the economic blockade and, as a result, inadequate prices for household appliances in our area, forced to take up the tools.

The very first examination after the autopsy showed that TDKS had burned down. Checking the line transistor D2499 revealed its breakdown in all directions.

Since transistors rarely go to this state on their own, it became obvious that there was some hidden reason that caused it to unacceptably open and completely fail. I had to turn to Internet services in search of a scheme. It turned out to be difficult to find TV circuits by name, as manufacturers based on the same typical scheme produce different models of devices with different CRT diagonal, and often there are clones from other manufacturers. Therefore, what they all have in common is not the diagram, but the chassis number. I found the inscription KS1A on the board. After downloading an archive with a similar chassis diagram and technical documentation for it, I began to study the diagram. Like any electronics repair, I decided to start with the power supply, or rather its launch. Having evaporated the TDKS and the line transistor, I thought about how to make the power supply work without the specified details. It is highly likely that without a load in the form of TDKS, it will not start. The diagram shows that the switching power supply generates two voltages: 13 and 125 volts.

Since 125 volts from the transformer of the switching power supply are fed to the TDKS, and 13 volts is involved in the control of the line transistor, he made the assumption that it was their increase that caused the failure of these parts.

Having sealed off the cathode of the diode D805 (it is he who serves to rectify 125 volts), he soldered a regular 100 W lamp to it. Thus, after switching on, the high-voltage part of the circuit will be de-energized, and it will be possible to check on the lamp what voltage the power supply is giving out.

Turning on showed that the power supply was started. However, instead of 125 volts, 150 volts are present! Instead of 13 - 15.5 volts. Checking the zener diodes in the PWM harness on the KA5Q0765 microcircuit did not reveal any crime. But the capacitor C802 for 33 microfarads of 50 volts due to its age (the TV is 13 years old) aroused suspicion.Since there was nothing besides a multimeter to check it, I decided to replace it. At hand was at 33 microfarads 63 volts.

After replacing it, the voltage at the output of the power supply dropped to 13 and 127 volts, which is absolutely acceptable. For reinsurance, I changed all electrolytes in the hot part - С812, С813, С815, С827, С304, С306.

Replaced the burnt out TDKS Samsung FSA 38032M with its Chinese-made 14A004C (S) analogue and a line transistor. To be on the safe side, due to the rather tough operating mode of the line transistor, I installed it on a radiator of a suitable size through thermal paste.

After turning on the device and making sure it worked, after an hour's run, he began to eliminate the old ailments.

This TV suffered from two more malfunctions:

1. disgusting sound (the impression was that the vowels were falling out of the words)) and in order to hear something more or less good it was necessary to increase the volume. It is difficult to say when such a malfunction occurred, but to remember whether it sounded good is even more difficult;
2. the second malfunction was that the conceived switching of channels, even from the remote control, even though the buttons on the front panel, only led to the fact that only the channel number changed, and the image and sound remained the same.

I started to fight the first malfunction by connecting external acoustics from a computer - the sound turned out to be quite decent. Thus, everything turned out to be in order with the processor from which the sound signal comes out. And the reason should be looked for in the ULF and standard dynamics. Replacing the dynamics did not give results. Therefore, it was worth paying close attention to the ULF, which in this TV is built on the TDA8943SF. It is worth noting that for different models of TVs on the KS1A chassis, ULFs are built on different microcircuits. The power supply of the microcircuit turned out to be normal - 12 volts.

In a typical switching circuit of this microcircuit, there is an electrolytic capacitor with a capacity of 10 microfarads 16 volts. Through it, the sixth terminal (reference voltage) of the TDA8943 is connected to ground. It was decided to replace it, which led to the restoration of normal TV sound.

The problem with switching channels had to be solved by resorting to the experience of other people who faced the same malfunction. Just like me, everyone noticed one oddity - if the channels were switched incorrectly, tugging on the antenna cable helped to restore the correct setting! As it turned out, there are many. And this malfunction occurs in Samsung TVs. The reason for this is the frankly poor soldering of the tuner, or rather the soldering points of the mass of the tuner board with its body and massive mass contacts on the board itself.

At first I wanted to completely solder the tuner, but I could not do it with a 25-watt soldering iron. I had to solder the tuner as it is, removing both of its covers. And although there is very little space on the chassis board for such maneuvers, we still managed to defeat this nuisance. Now the channels are switched without incidents.

Poor soldering needs to be said separately. A close inspection of the entire chassis board revealed many places where the soldering had to be repaired.

What was the reason is difficult to say - whether the soldering quality was initially poor, or the TV's long service life. But after the manipulations made, the TV again took its place in the kitchen.

Repairs were carried out by Nikolay Kondratyev, Donetsk.

Samsung LED TVs are reliable and popular devices. In the TV of the latest generations of the manufacturer, malfunctions in the first year of operation are found in 5-7% of users. The most common problem is the lack of an image on the screen.

Samsung TV looks like it is turned off, does not respond to remote control signals (remotes).

• Lack of power - check that the TV is connected to the rear panel and the outlet.
• Malfunction of the video processor - diagnostics and qualified repairs are required.

The TV screen looks dark and the unit reacts to remote control signals.When switched on / off, a splash screen with a corporate logo appears.

• No signal - check the external antenna connection.
• Incorrect brightness settings - go to the “Pictures” menu and adjust the brightness, turn off the power saving mode.
• Malfunction of LED backlighting - disassembly of the panel and replacement of burnt-out LED strips is required.
• Damage to the inverter - an electricity converter that supplies current to the LED.

With a faulty inverter and LEDs, the image on the screen is actually present, but in the absence of backlight, it becomes very dark. To diagnose the problem, darken the room and bring a flashlight to the screen. If you see a picture, the problem is with the LEDs or the inverter. You can replace faulty parts yourself or call a wizard.

The image on the Samsung LED TV looks like a narrow strip, a solid or color screen appears. The problem appears immediately after switching on or after 5-10 minutes of operation. Sometimes the picture on the screen freezes, the screen becomes dark, and after turning it off and on again, the problem reappears.

• Damage to the video amplifier or processor (in 95% of cases, only one color appears on the screen). It is necessary to call a telemaster for accurate diagnostics and repair. It is impossible to eliminate the malfunction on your own without the presence of special equipment.
• LCD malfunctions - the cost of repairs can be up to 80% of the cost of a TV. Repair is advisable only for new TVs under warranty.

You can determine the breakdown of the LCD matrix yourself. To do this, with the device turned on, slightly press down on the screen. If the matrix is ​​faulty, the image at the point of pressing will freeze, darkening or strong color distortion may occur. Failure of the matrix is ​​rarely sudden, as a rule, with this problem, “broken pixels” appear first, then their number increases.

Samsung TV works fine, but suddenly the screen goes dark and the device turns off. When turned on, the problem can be repeated many times.

• Energy saving feature enabled - go to settings and disable it.
• Sleep timer activated - check if the sleep timer is on and deactivate it.
• TV goes into standby mode - signal problem for more than 10 minutes, check the connection.

We offer step-by-step instructions for restoring the Samsung LED TV screen to work. In 50% of cases, the absence of an image can be eliminated on your own without calling the wizard. So, what to do if the image on your Samsung TV is missing:

• Check that there is a power supply and that all plugs are connected correctly. If there is electricity, you do not feel the characteristic burning smell from the TV or the socket, the breakdown lies in the TV itself.
• Check the functionality of the device: the presence of sound, loading the splash screen when turned on, the operation of the remote control and buttons on the case. If the TV does not turn on, try unplugging it for 10 seconds and then plugging it back in. If there is still no image, then go to step 3.
• Restore your TV to factory settings. Go to the menu "Support" - "Self-diagnosis" - "Reset". After entering the pin code, the TV will return to factory settings, having previously turned off and on.
• On TVs equipped with the “Auto Diagnosis” function, you can run a picture test. During testing, the device checks all settings and the operation of key elements. If the test does not start, then the problem cannot be solved without disassembling the TV.

Life hack: If the Samsung LCD TV responds to the remote control and has sound, but no picture, then try increasing the volume to the maximum. In some cases, this simple method helps to restore the normal picture.

If none of the above helped to return the image to the screen, the TV must be disassembled to identify the cause of the breakdown and eliminate it. It is better to entrust the disassembly of the device to the employees of the service center or an experienced telemaster.

The principle and procedure for disassembling Samsung TVs is virtually the same for all models. It is necessary to put the device face down and unscrew the rear panel screws, open the latches. Carefully remove the panel and inspect the microcircuits. As a rule, there are two of them. Check the connection of the loops. If everything is in order, then you should check the LED backlight and inverter.

The normal input voltage to the inverter is 10-15 Volts, the output is 60-120 Volts. The parameter depends on the diagonal of the screen: the larger it is, the greater the voltage. If the voltage is absent or much lower than normal, then the inverter is faulty. Its replacement or repair is required. Is the voltage normal? We check the LED backlight strips by applying voltage to each. Having identified the faulty tape, we replace it with a new one. If all tapes are normal, it is likely that the LED driver is burned out and needs to be replaced.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The products of the South Korean company Samsung have proven themselves well in the modern market. In addition to the constant quality of products, this manufacturer focuses on the widespread use of advanced technologies. For example, among the assortment of corresponding stores, you can find Samsung's ultra-modern television technology with a curved LED matrix.

However, even the highest quality equipment sometimes fails. One of the common problems faced by owners of television electrical equipment is the so-called black screen. In other words, the image of this device disappears. At the same time, he, obviously, catches a TV signal, since there are no problems with sound.

It is quite possible that the shutdown of such a device, for which the picture has disappeared, can be carried out only forcibly, after pulling out the plug (plug) from the socket.

You can try to figure out for yourself what is the reason that the Samsung TV has sound, but there is no image, and do the repair yourself.

The most common malfunctions on Samsung TVs include the following failures:

• dark image;
• the screen turned black;
• the sound disappears.

The reasons for breakdowns can be as follows:

• disconnection from the socket or inoperability of the wire;
• failure of the inverter - a device for supplying voltage to illuminating lamps;
• inoperability of the matrix, motherboard, backlight unit;
• converter, decoder and decoder problems;
• failure of the power supply unit or board.

Do not forget that the lack of brightness or sound transmission on a television device is quite possibly caused by a malfunction of the settings familiar to the eye and ear. In such a situation, you just need to bring them to comfortable parameters.

If we talk about real malfunctions associated with the operation of the device, then a situation is quite common when, after watching it, they turned it off, and after turning it on, they found that video was missing on it. In the situation described, most likely, one of the working elements of this technique requires replacement or repair. But first things first.

As mentioned above, in addition to the fact that the device in question can work, but does not show a picture, there is a possibility of encountering the following display defects:

• vertical and / or horizontal stripes;
• spot on the display;
• the contrast and (or) brightness has disappeared (broken);
• the image on the TV flickers;
• doubles;
• half of the screen is dark;
• there is no clarity of the picture;
• does not turn on or goes out after a while.

Inside the technical documentation attached to any modern electrical engineering, usually contains recommendations for diagnosing and eliminating some of the above defects. To get out of some situations, it is really helpful to listen to them.

Obviously, if your Samsung TV screen goes dark, then it needs qualified diagnostics to determine what exactly is broken. An experienced electronics repair technician will test the operability of the elements of the equipment handed over for repair and determine whether in this particular case it will be necessary to replace the matrix or some other manipulations on it.

The simplest diagnostics can be done with your own hands. In particular, if your Samsung device has a flickering screen, a blinking image, or stripes appear on its display, check the quality of all external wire connections connected to it.

We recommend using the self-diagnosis function, which is equipped with all modern models. You can find the corresponding item in the main menu - Support - Self-diagnosis.

In some cases, calibrating the LCD TV will help solve the problem.

However, if, nevertheless, there is no displayed picture on the LED display of a Samsung device, but sound transmission is present, most likely there are problems with its backlight or other internal electronic modules, the solution of which will require professional intervention.

Depending on the type of malfunction, due to which the equipment in question has sound, but no picture, Samsung TV repairs are made in different ways. In addition, troubleshooting methods may differ depending on its design.

To solve the problem, tidy up the contacts both inside and outside the Samsung LCD TV. In addition, sometimes a complete replacement of the matrix (plasma screen) is required. Let us consider in more detail the situations requiring repair work, in which Samsung TV equipment disappeared from the display, but the sound remained.

If the picture disappeared on the Samsung TV, but the sound is in place, then it is advisable to check the cable serviceability, because with a high degree of probability, it was the cord that caused the malfunction. At home, this can be done by connecting it to a known working device, or by replacing it with a known working cable.

If on a Samsung LCD TV that was previously working without complaints, when connected through the cable under test, there is sound transmission, but there is no picture display, then this conductor is broken and must be replaced with a new one.

All of the above is also true for connections via an HDMI cable.

The following symptoms may indicate malfunctions of the inverter, which supplies voltage to the backlight lamps:

• the display flashes;
• there is sound, but no display;
• the backlight turns on, but immediately goes out;
• violation of display (for example, the discussed device shows a color television broadcast in black and white);
• uneven backlight (brightness) of the display.

The weak point of modern television inverters can be considered high voltage transformers, which are subjected to increased load during operation.

The reason for the lack of display on the display of television equipment may be the inoperability of its backlight. Try taking a flashlight and shining it on a dark surface when your device is on. If you can see something, then this is a sure symptom of problems with the backlighting lamps, the voltage to which is supplied by the inverter. Another two signs of their inoperative state may be blackouts or, conversely, white spots on the TV display.

Manufacturers of digital technology claim that the backlight lamps can only be replaced in conjunction with the matrix, which makes the elimination of this problem a very expensive procedure.

A faulty power supply or power board can be identified by one of the following symptoms:

1. there is no picture on the display (in particular, the image disappears, but the sound transmission is working);
2. violation of the image (kinks, stripes, the device shows a color television broadcast in black and white);
3. the display appears with a delay, or only after several attempts to switch on.

Most often, malfunctions in this part of the design are caused by the failure of the capacitor filters, which in this case must be replaced.

Now you know what could be the reasons that there is no picture on the TV produced by the Korean company Samsung. If the television equipment has stopped showing TV broadcasts, it is advisable to take it to a service center or call a trusted specialist to your home. Since the device may need serious help in the form of repairing radio parts, due to a malfunction of which it stopped showing content.In some cases, an expensive replacement of the LCD display or CRT element will be required.

In order to prevent the occurrence of problems with the operation of television equipment, avoid rough mechanical influences both on its screen and on the body of the product. In addition, make sure that all wires through which the system is connected are located freely, without bends and strains. Do not forget that it is recommended to wipe the TV screen with a soft, lint-free cloth (for example, microfiber), or specialized wipes for office and home electronics. Compliance with these simple rules can significantly extend the life of television equipment.