Do-it-yourself Samsung TV repair does not turn on

In detail: do-it-yourself Samsung TV repair is not included from a real wizard for the site my.housecope.com.

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.

Video (click to play).

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!

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.

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.
In both domestic and imported models, the potential can often go astray, for the function of which the posistor is responsible.
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.
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.

There can be many malfunctions with a Samsung television receiver, and it is not always necessary to have qualified help from a wizard to eliminate them. For example, if the Samsung TV does not turn on, then in some cases it is still possible to repair it with your own hands.

To search for breakdowns in any household appliance, there is a certain sequence of searching for problems. The repair of Samsung TVs is no exception, for which the search for possible breakdowns begins from the outlet and continues in the power supply. Next, the switching board and processor module, sweep and synchronization module, etc. are examined. The study may end in the control unit, troubleshooting the stabilizer or finding a failed transistor in the line scan module. Find it all, without opening the TV set - it is impossible, and the ordinary owner of the device will not be able to fix such a problem.

If the TV is fresh from the store, the chances are very low that it is defective. The reason may be your inattention, and you did something wrong. It is recommended to read carefully instructions for the device... But if he was already in work and suddenly stopped responding when trying to turn it on, then looking for the cause of the failure according to certain signs will help to decide whether to contact the service or you can handle it yourself.

Very often, the owners of TV sets panic and start calling the master at the slightest problem with their device. But if you calm down and take a sober look at the situation, then there may not be a breakdown in equipment. It is required to check the behavior of the TV set for some symptoms.

You want to check what mode the TV is in. For instance, Standby mode - this is the standby mode of the TV, and you can find out about its on state by looking at whether the red light on the unit panel is on. It should be remembered that it is not recommended to leave the television receiver in this mode for a long period of time, since when the unit seems to be turned off, all the circuits of the power supply remain energized. If the power supply occurs power surge, then all primary circuits will burn out, after which the TV receiver will refuse to turn on. Therefore, the unit should be turned off with a button located on its panel in order to reduce the risk of burnout of the electronics.

In the case when you observe the indication, but the TV set does not respond to commands from the remote control, then you can try to turn on the device using control panellocated on it. If you succeed, then the remote control is faulty. Although, in principle, it cannot break, except that a quartz resonator can break from a fall, which will have to be replaced. Most often, in the remote control batteries run out or run out... In any case, it is worth disassembling the remote control and trying to fix the malfunction of the remote control with your own hands.

In a situation where there is no indication, and when you press the button, nothing happens, you do not hear clicks and do not notice the blinking of the LED, then we can assume that defective socket... Of course, you can try to connect the device to another power source, but if this does not help, then, without special knowledge and qualifications, you will not be able to repair the TV receiver with your own hands. Even replacing a conventional fuse will be difficult for you, as they are not easy to find on modern TVs. Therefore, calling the wizard will be the right decision.

If a single blinking of the indicator was noticed, after which it continues to burn with a steady light, or its color has changed, this may mean that the device is in operating mode: either AV or in the mode of connecting to a PC. Therefore, it will be necessary to transfer the unit to TV reception mode... In addition, the TV can be locked against unauthorized use (for example, by children) - in this case, you need to remove the lock using the instructions for the technician.

Please note: if the antenna is not connected to the TV receiver, the TV signal is very weak or is absent at all, then the TV set, after suppressing the noise, may enter the monitor mode. That is, you will see a black screen with no sound.

Everything that a non-specialist in teletechnics can do is limited to checking the elements outside the apparatus. In other cases, it is not recommended to open the device with your own hands, and you cannot do without a wizard.

If it was not possible to turn on the TV from the control panel, then you need to observe the behavior of the standby indicator (it normally lights up with a steady light, more often - red). If it turns off when you try to press the button, then the problem should be looked deeper in the device, as this indicates internal blocking triggered (not to be confused with the child lock, which is activated by the user). This happens when one of the modules fails. In some TV models, a clicking sound can be heard when the lock is activated. You will not be able to fix such a breakdown with your own hands. The only reasonable way out is to call a specialist.

Such color switching indicates that the CPU generated a signal to turn on the device, and it was sent to all modules to execute it. If any the module is out of order, then he cannot execute the command. For example, a failure in the power supply does not allow it to go into the desired mode. In this case, the processor, not receiving confirmation from the power supply unit about normal operation, gives a signal to cancel turning on the TV receiver and returns it to sleep mode.

Such flashing can continue for a long time until the main cause of the failure is removed: the inverter was repaired, the transistor was replaced (for example, on the s62 chassis), the power supply was moved, or another of a large number of reasons.

When the indicator is green, and the TV receiver does not even think to turn on, then this situation can be called ambiguous. Required main board check with the measurement of the voltage supplied to it. Also, a study of commands for launch, backlight, etc. is carried out.

If the lamp turns on, signaling the operating state, but there are no signals from the main board, while the device does not respond to the remote control and pressing the buttons on the case, then this may indicate glitch in software... Only flashing and updating the software will be able to return the normal operation of the motherboard.

This behavior of the indicator indicates that a malfunction has occurred in the TV set, and it does not carry any more useful information. Would need complete electronics diagnostics, starting with the “ringing out” of the power supply and ending with the converters located on the system board.

When it takes a long time to turn on the TV set, this indicates that some unit of the unit is out of order. For TVs with picture tubes and LCD panels, the breakdown factors can be very different. It is quite difficult to identify a malfunction without the necessary experience and knowledge. Since the problem unit still starts to work, and only a qualified technician can get to the bottom of the cause of the failure, using special equipment to carry out the necessary measurements. In some cases, it will be necessary to check the device at the service center at the stand, using special software.

As you can see from the above possible reasons why the TV stopped turning on, there are not so many options for repairing it on our own. This rule also applies to the case when the TV itself turns on and off immediately. And since the unit is a complex electronic device, it requires accuracy during operation and timely service.

Samsung technology is popular all over the world, but even top-end devices can suddenly fail. In most cases, troubleshooting will require the help of qualified and experienced employees of the service center, but sometimes it is within the power of a common man to cope with the "repair". The first and most important stage of repair work is diagnostics and finding out the reason why the Samsung TV does not turn on. Having identified the problem, we will soberly assess the situation and decide whether the services of a master are really necessary or whether you can fix the breakdown yourself.The search for the problem of inoperability should start from the outside, and end inside the device itself:

The first step is to check the outlets and power cord. We are looking for kinks and scuffs.

Inspect the case for mechanical damage resulting from a fall or other force majeure.

We examine the LCD matrix to see if there is a characteristic "spider web" of broken glass.

Sniffing around to see if it smells like burnt.

For those who boldly hold a screwdriver in their hands, open the back cover of the Samsung TV and visually inspect the boards for mechanical or thermal damage to the microcircuits.

The channels turn on badly and for a long time (or not the first time) - most likely the operating system is to blame. A simpler and more functional OS Tizen is installed on modern devices, but it is not without its drawbacks.

It is best to entrust detailed diagnostics to specialists who, from their own experience, know what a motherboard, a voltage stabilizer, a scanning module and a TV processor are.A new device from the store is unlikely to be faulty. Therefore, before using it, it will be useful to read the contents of the Quick Start Guide and make the connection according to these instructions.Below are the possible reasons for the inoperability of the Samsung TV, for the elimination of which the help of professionals will not be needed:

Standby mode. In Standby, the device continues to work, although its display remains inactive. Pay attention to the panel LED, which will glow red in standby mode. To start the TV, you just need to exit the standby mode by pressing the power button on the case or on the remote control.

Defective remote control. Try replacing the batteries in the remote control or use a smartphone with a special utility from Samsung (TV-remote) installed to start the TV.

Broken socket. If the indicator on the control panel does not light up, connect the television set to a different power source and start it in the usual way.

AV, HDMI or wireless connection active. The TV display may be configured to mirror the interface of a computer or mobile gadget, so launching regular TV is not available. Disconnect all devices and switch the mode to watching TV.

Weak signal. "Black screen" is the result of bad weather (thunderstorm, snowstorm) or malfunctioning of the external antenna. In some cases, it is enough just to wait a few hours for the signal quality to improve automatically.

In more detail about some of the methods of troubleshooting on our own will be described below. If the self-repair did not give the required results, in no case should you panic - keep calm and try again to soberly assess the situation.The launch can be prevented by the "Protection against unauthorized use" mode (the so-called "child protection"), which blocks the panel keys: in this case, you must use an active remote control.Remember, in Standby mode, the Samsung TV is always on, some of the microcircuits are energized, so it is very likely that after a power surge that has occurred, the TV set will fail. And the minimum that burns out is the internal power supply, but replacing the module costs a lot of money, so we recommend getting a voltage stabilizer.No matter how ridiculous it may sound, the whole problem sometimes lies in the inoperative remote control. Replace the batteries in the remote control or take an analogue one (from another TV or virtual remote control application for a smartphone) and try to turn it on again. Please note that the indicator of a good "lazy" will blink or light up in a different color when you press any of the buttons. You can also always use the navigation keys located on the side or rear of the case.If, when you try to start the display from the control panel, the red LED stops lighting or you hear a characteristic clicking sound, then the whole point is in the blocking of the indoor module caused by a power failure that occurred. It will be extremely difficult to cope with such a problem on your own, so you should immediately contact a specialist and not waste your time. Image - Samsung TV repair do-it-yourself does not turn on

The custom setting of "child lock" will also not allow activating the TV set from the control panel, so before calling the wizard it will be useful to try to turn on the TV via the remote control.

The blinking of the LED on the Samung is a sign of unstable operation of the device's battery or power outages. The reason should be looked for in the outlet or in the cable connecting the TV to the current source: such mechanical damage can be easily noticed even by a person who is far from repairing electrical equipment.

A blinking indicator indicates a failed power supply, which is hidden inside the case. In this case, you should not try to disassemble the television receiver on your own, because you still will not be able to replace, for example, a non-working transistor or capacitor located on the motherboard.

Some of the most popular breakdowns (for example, there is sound, but no image) are associated with the most expensive part in a Samsung TV - a monitor:

Burnt-out LED backlight lamps (common to both LCD and plasma screens).
Failed backlight inverter (electrical energy converter).

There is only one way out, to replace the entire liquid crystal matrix.

This malfunction is characteristic of Samsung supporting Smart-TV technology: an endless reboot is the result of a firmware failure or an unsuccessful update. Any user can do a flashing: just follow the instructions that come with the factory kit for the device. Consultation of the service center will be needed if reinstalling the software did not give the expected results: it is likely that you will need to thoroughly diagnose the device and perform a targeted set of repair work.

An ordinary user is able to cope only with those problems that do not require opening the television case - it should be understood that attempts to repair the elements of the motherboard on their own can lead to a complete failure of the device. The services of professionals will be needed if:

The Samsung screen does not light up either when using the remote control or using the buttons located on the device itself, and at the same time the wires are intact.
The display does not show signs of life, although the dedicated power indicator is green. Perhaps the problem lies in the board, and only a specialist will be able to check the correctness of the current supplied to it or identify any other breakdown.
The indicator lights up either green or red, which, as a rule, means a failure in the operation of the power supply system. Replacement of transistor or electrical adapter will be required.

There are other reasons for the malfunction of your TV, which will be clarified by an experienced technician, and in order not to aggravate the situation, it is recommended to immediately contact a Samsung service center.

If your Samsung TV won't turn on, it could be due to a power surge after a lightning storm, a failed software update, or a burned-out motherboard. In some cases, the user can cope with the problem on his own, but if there is no confidence in his competence, it is best to resort to the services of an experienced TV technician.

Lead author of many columns at my.housecope.com/wp-content/uploads/ext/956. He is well versed in technology and electronics. He is able to solve any technical problem in a matter of hours, he likes to write about his experience and best practices.

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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:

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;

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.Without video and audio equipment, few people can imagine a full-fledged home, and it is precisely because of regular and intensive use that this type of equipment is most often subject to breakdowns. Repair of TVs can be done at home, if you call a master, or do all the work yourself.Before starting repair work, you should determine what exactly broke in the TV. In any case, this will greatly facilitate both the independent repair process and the clarification of the essence of the problem to the TV technician. Image - Samsung TV repair do-it-yourself does not turn on

Photo - Samsung design

The main types of faults:

The device does not turn on. In both CRT models and more modern LCD TVs, a malfunction occurs due to a blown fuse. But in different devices, it can be represented by different details. At the same time, the problem may be a burnt out diode bridge; Photo - kinescope
The potential of imported and domestic projection TVs is very often lost. A posistor is responsible for this function;
Breakdown of plasma monitors. These include color changes, swings, interference, or dark (light) streaks on color TVs during broadcast;
However, sometimes problems with turning on or operating certain functions are due to a faulty power cord or outlet.

Of all these troubles, the most difficult to fix is screen breakage. For example, if light reflections appear on the monitor after a shock or water ingress on the matrix, then it is better to immediately take the device to a service center, where it can be repaired under warranty.

Photos - details

But most of the repair work can be done easily with your own hands. Let's consider in order how to carry out urgent repair of home LCD and LED TVs Thomson (Thomson), Sharp (Sharp), Samsung, Panasonic (Panasonic) and other models:

The difference between the above types of TVs lies in the different backlighting, but in principle, their operating schemes are very similar. In LSD TVs, the monitor is illuminated by fluorescent lamps, and in LED - by LEDs. Therefore, if the monitor does not turn on, you immediately need to check whether the backlight is receiving power;
Regardless of the brand, the back panel is removed. It is screwed to the base with screws. After that, you need to remove the network power wires from the matrix (first unplug the device from the outlet); Photo - rear panel
To check their performance, you need to connect the most ordinary lamp to the contacts. Most often used at 100 watts;
It should be noted that modern Toshiba (Toshiba), Sony (Sony), Philips (Philips) can connect several backlight sources to the circuit, so you will need to check each one separately; Photo - matrix
For testing, the matrix is removed, a lamp is connected to the contacts and the power wire is connected to the network. If it is working properly, then the lamp will light up. If not, then you will need to replace the cable or repair individual threads.

In addition, a certain area of the backlight may burn out.

In different models of television equipment, the lamp is replaced in different ways. For example, for many Daewoo, Akai and Hitachi TVs, to dismantle a burned-out lamp, you will need to remove the matrix from the panel and reinstall the element on it. At the same time, for some Rolsen and Funai, it will be possible to change a burning light bulb or diode without dismantling it. Depending on the design, you will need to bend (unsolder) the contacts, remove the gasket and carefully remove the burnt element from the case. In its place, a completely similar lamp is installed, both in terms of parameters and dimensions.

Photo - LCD monitor device

Many Chinese models of television equipment - CTV, VAO, BBK, during disassembly you can see light stripes on the matrix. They indicate a breakdown of this particular element. Due to some external factors, the part stopped working and oxidized. In this case, you need to select an element that is identical in terms of performance and install it in the place of the faulty one.

Unlike old stationary CRT or portable models, plasma and ED versions are very rarely repairable if the screen breaks. This is a very time-consuming process, so not even all professional workshops undertake such work. In most cases, if the monitor is cracked, it will be cheaper and easier to buy a new TV set than to repair the old one.

Video: PHILIPS TV repair

Despite the total use of plasma, many owners still have more outdated CRT TVs (for example, Vityaz, Elt, Rubin, Horizon, JVC). Step-by-step instructions on how to carry out repair work on electron beam models:Tips on how to check the TV posistor may be different, but any professional telemaster will recommend that you measure the resistance between its contacts. The part has four of them, that is, two pairs. For one honey, the resistance can be up to 600 ohms, while the other's resistance is in the range of 1-5 ohms. But this is only a theoretical check; for a more accurate diagnosis, you will have to solder the posistor.

Video (click to play).

In addition, capacitors and transistors often burn out in CRT TVs. They can even be diagnosed visually. They swell or change color on the board. If you see that the capacitor is blackened or cracked, then it must be replaced with a working analogue.