DIY samsung lcd TV repair

It is impossible to imagine a modern apartment or house without video and audio equipment. This equipment is used on a daily basis 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 that have more than one light source. 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 protection 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 make a 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 working 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.

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 repair practice.

There is no need to consider the problem of electrolytic capacitors in the rectifier filters of power supply modules, 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 TV models 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, SMART-TV in particular, 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, accounting for 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 or 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 the closure in the lowercase deflecting coils of the CRT. In this case, 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!

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 explanation of the essence of the problem to the TV technician.

Photo - Samsung design

The main types of faults:

1. 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
2. The potential of imported and domestic projection TVs is very often lost. A posistor is responsible for this function;
3. Breakdown of plasma monitors. These include color changes, swings, interference, or dark (light) streaks on color TVs during broadcast;
4. 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:

1. 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;
2. 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
3. To check their performance, you need to connect the most ordinary lamp to the contacts. Most often used at 100 watts;
4. 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
5. 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, when disassembling, 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