In detail: do-it-yourself repair of samsung lcd TVs 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.
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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!
I offer a beginner master some instruction on where to start repair of LCD TVs and monitors.
First of all, even before disassembling the case TV or monitor, you need to see the exact model name indicated on the sticker in the recess on the back of the device. This will allow you to determine which parts will be needed for the repair. In addition, knowing the model name, you can find repair instructions and circuit boards. Also, before disassembly, in order to save yourself from unnecessary work, it is worth examining all the external details - the network cable, the control mechanism, in case of breakdown monitor - a cable connecting the device with the computer's video card and the video card itself. Distorted images on the TV screen can also be associated with a poor signal from the antenna.
After making sure that the external elements are in order, you can proceed with the repair. It is important to take all safety measures: disconnect the TV or monitor from the mains and, if possible, ground yourself so as not to kill the microcircuits with static electricity. Then you can remove the back cover. On most LCD devices, it is held in place by screws that are easy to remove; sometimes there are also latches, only part of the cover can be removed, it depends on the model.
Motherboard (main, main). It controls the input and output of video and audio signals, adjusts picture settings, searches for channels, etc. It contains RCA, HDMI and others connectors. It also runs a cable to the speakers.
T-con board. Can be standalone or embedded in a matrix. It is connected to the motherboard with a fragile LVDS cable - you need to work with the board carefully.
These parts are always present in any TV, but they can look different - for example, the backlight inverter can be located on a common board with a power supply.
The repair can be done in two ways. Firstly, you can find its number on the failed board, find a new part in the online store and replace it. Secondly, you can do repairs at the component level. In the second case, you will have to check all the components in turn until the damaged one is found. It should be borne in mind that component repair is not always possible.
Most often at power supply capacitors fail. Swollen capacitors are easy to spot by the bulges on their bottoms. These parts are simply removed and replaced with similar ones with the same capacity and voltage.
Fuses can also "burn out" - either due to a short circuit or due to a constant overvoltage. You may need a multimeter to check the fuses. The reason for the blown fuses may be a malfunction of the switching voltage stabilizer - you need to check the diodes of its bridge and power switches.
If the device does not enter the operating mode, but the standby mode is present, you need to power supply check secondary circuits.
The system board should be checked if the TV does not respond to a working remote control and buttons on the case.
To repair the main board, special diagnostic equipment is most often required: a multimeter, a programmer, etc.
One of the most common motherboard malfunctions is the breakdown of the built-in DC-DC converter, which you can replace yourself, knowing the model of the microcircuit.Some universal parts can also be used.
If there is sound and backlight when turning on the TV or monitor, but the image is displayed with various distortions, the t-con board may break. Like the motherboard, the t-con is generally best replaced completely. To do this, carefully disconnect the LVDS cable and LCD panel cables.
Some of the t-con board components can be replaced by yourself. The easiest way is to change the gamma converter, the model of which is indicated on the PCB. Sometimes a new DC-DC converter can be supplied. Breakdown of the first is diagnosed by the nature of the malfunction (the image loses contrast, colors are distorted, etc.), the second is diagnosed by ringing the control points on the board.
When repairing an inverter, you must first check the voltage stability and other parameters of the board using a multimeter, and also inspect its parts visually for visible faults - burnout of elements, swelling of capacitors, etc. Most often, field-effect transistors and transformers fail. A problem may arise with checking the latter - a breakdown is sometimes determined only in operating mode.
If everything is in order with the inverter unit, then a check is required and, if necessary, replacement of the backlight lamps.
Well, well, I think this information on repair LCD TVs and monitors will be useful for a novice master.
I invite you to my YouTube channel , which shows illustrative examples of the repair of various equipment.
I also invite everyone to the groups in social networks: "Telemaster" in Odnoklassniki and "Samodelkin" In contact with.
Hello Victor! As a result of the search for the power supply diagram of the Samsung UE40D6510WSXKZ (BN44-00427A) TV, I got to your site. A day of searching gave no result. Can you help me? Before the breakdown, the TV worked fine, I watched programs on ID TV, then something clicked, the screen went out, the sound disappeared, only the blinking (double) glow of the power indicator remained. The TV does not react to the remote control. I disconnected the plug of the mains cable, the indicator went out, turned it on again, the indicator blinks and nothing else happens (you can hear, however, periodically some clicks). I opened the back cover, visually found nothing (no traces of overheating of parts, tracks, no swollen capacitors). There are three fuses on the board FP801S, FP802S, FP803S. Fuse FP803S (T2A) turned out to be blown. I tried to solder a 1A fuse on top (there was no other at hand), but when the plug is connected (220V network), it instantly burns out. Could you tell me what could be the reason for this, based on your rich experience (it is clear that somewhere there is a short circuit, but without a circuit it is difficult to check anything). Or advise where to find the circuit of this power supply unit. There are many pictures with the image of this power supply unit, but there is no diagram anywhere.
I have no schema. In such cases, I check the circuit on which the fuse blows.
Judging by the answer, you did not deal with such a problem with these TVs. It is clear that you need to check the problematic circuit, but how to do this without a circuit? Immediately after the fuse, there are two parts, similar to transistors, on a common radiator with the same designation MDF9N50 CE10823GS, but no matter how I tried to find their parameters and analogues on the Internet, I could not find anything. Can you tell me what it is and how to check it. Or is it better to contact the group in VK?
These are field effect transistors. How to check them is full of information on the net. Contact the group, there, perhaps, they will tell you more precisely.
Hello! I dropped these transistors, they turned out to be punctured (short circuit between all three terminals in any direction and combination), but in Kostanay I still cannot find exactly such a transistor. I wrote out from China, but they will come, as usual, not less than a month later, especially since they now have New Year's holidays until 25.02. We offer a 9N60 transistor, is it possible to replace it?
Good day ! Victor there is such a TV LG 32CS560-zd on the power board EAX64604501 between the trance and the radiator, the blackened condender C614, most likely everything around everything also flew out.On the radiator, what elements (excuse me for my ignorance) shim, as I understand it, and change them anyway? Have you encountered such a problem or a similar one? (He just doesn't have time with my "experience" for a couple of weeks)?
I can't say exactly about your TV, but there are usually field-effect transistors or diodes on the radiator.
There are simply no denominations and I did not find manuals on TV .. well, we will look for a board or a breaker .. thanks
Hello. My BBK Lt3209s TV does not display colors correctly. With a dark picture, instead of deep dark tones, green. With a bright overabundance of light tones. What could be the problem ?
Contact the group with this question
Hello Victor. Such a question: the LG W2234S monitor displays only white, blue, green, red, i.e. periodically. This is all from the words of the owner of the monitor. I don't have it yet. The monitor turns on and off. Three thin vertical stripes. Still sometimes a picture appears. As the picture appeared, it works without problems. What do you think could be? Power supply, capacitors - that's understandable. Stripes are a loop. And the flashing colors?
Hello. such a problem:
LCD thomson 32HU5253
Your TV set. When plugged into the outlet, the indicator flashes and goes out once, when it is turned off, it also lights up and goes out. So in a circle. I wound up a couple of times. Worked without problems. Then they turned off the silence.
I looked at the voltages in accordance with the manual that I found (MT10L-EU-Service-Manual):
+ 3V3_STB (P100Pin7) = 3.3V
P100 PIN1,2,4 = 23.7V
L112, L113,) = 23.7V (12V in the manual.)
Check 5V (U106 + Q100 OUT, L106) = 5V
Check VCCK (U107 OUT, L100) = 1.1V
Check AVDD1V2 (U105 PIN2) = 1.2V
Check DVDD3V3 (U104 PIN2) = 3.3V
Check AVDD3V3 (U109 PIN 2) = 3.3V
Check DDRV (U12 PIN 2) = 1.2V (1.5V in the manual).
I tried to flash the U702 and U703. No results were obtained.
Tell the teapot what else to see.
Perhaps there are problems with the backlight, or rather with the contacts of the lamps - they often get charred
I checked the lamps with a tester
The lamps come on. Maybe with a mine of what?
It is no secret that a breakdown of a television receiver can ruin the mood of any owner. The question arises, where to look for a good master, do you need to take the device to a service center? You need to spend your time on this, and what is important - money. But, before calling the master, if you have basic knowledge of electrical engineering and know how to hold a screwdriver and a soldering iron in your hands, then repairing the TV with your own hands in some cases is still possible.
Modern LCD TVs have become more compact and easier to repair. Of course, there are breakdowns that are difficult to detect without special diagnostic equipment. But most often there are malfunctions that can be detected even visually, for example, swollen capacitors... With such a breakdown, it is enough to evaporate them and replace them with new ones with the same parameters.
All TV sets are the same in their structure and consist of a power supply unit (PSU), a motherboard and an LCD backlight module (lamps are used) or LED (LEDs are used). It is not worth repairing the motherboard on your own, but the power supply unit and screen backlight lamps are quite possible.
As already mentioned, the design and principle of operation of LED and LCD TVs, regardless of the manufacturer, are the same. Of course, there are some differences, but they do not play a significant role in the diagnosis of faults. Often, in the event of a problem with the power supply, the LCD TV does not turn on at all, while there is no indication, or it turns on for a while and turns off spontaneously. Using an example, the repair of a DAEWOO LCD power supply unit (can be applied to plasma) is considered, which is not much different from repairing an LG TV, as well as Toshiba, Sonya, Rubin, Horizon and similar models.
- First of all, before you repair the TV, you need to remove the back panel of the device with a screwdriver by unscrewing the screws. On some models, the rear wall may be latches installedwhich must be handled with care so as not to break them.
- After removing the cover, you will see the power supply unit, consisting of several modules on the left, and the motherboard on the right.
- On the power supply board you can see 3 transformers: the bottom one is the mains rectifier choke, the top one on the left (large) feeds the inverter, and on the right is the standby power supply transformer. You need to start checking with it, since it turns on the standby mode of the TV receiver.
- Duty transformer when the device is connected to the network, it should give out a voltage of 5 V. In order to correctly find the wire on which you need to measure the voltage, you can use the diagram, or you can see the markings on the case. In this case, opposite the required contact is written - 5 V.
Measurement is taken first open circuitby connecting one probe to the found contact, and the other to the cathode of the diode on the radiator. In this case, there is no break. 
As you can see from the review presented above, repairing TV power supplies with your own hands is not such an overwhelming task. Following this description, you can also repair plasma TVs.
Do-it-yourself TV repair with a kinescope, for example, such as: Rubin, Horizon, Sharp 2002sc, LG TVs, as well as repair of the Vityaz TV, begins with checking the power supply unit for operability (this is done if the unit does not turn on). It is checked using incandescent bulbs for 220 V and a power of 60-100 W. But before that, be sure to disconnect the load, namely the horizontal output stage (SR) - connect a lamp instead. The CP voltage ranges from 110 to 150 V, depending on the size of the tube. Must be found in the secondary circuit SR filter capacitor (its values can be from 47 to 220 microfarads and 160 - 200 V), which stands behind the SR power rectifier.
To simulate the load, you need to connect a lamp in parallel to it. To remove the load, for example, in the popular Sharp 2002sc model, it is necessary to find and unsolder the inductor (located after the capacitor), the fuse and the limiting resistance through which the CP stage receives power.
Now you need to connect the power supply to the power supply unit, and measure the voltage under load. The voltage should be between 110 and 130 V if the CRT has a diagonal of 21 to 25 inches (as in the 2002sc model). With a diagonal of 25-29 inches - 130-150 V, respectively. If the values are too high, then it will be necessary to check the feedback circuit and the power supply circuit (primary).
It should be noted that electrolytes dry out during prolonged operation and lose capacity, which, in turn, affects the stability of the module and contributes to an increase in voltage.
When the voltage is too low it is necessary to test the secondary circuits to exclude leaks and short circuits. After that, the diodes for the protection of the power supply of the SR and the diodes for the power supply of the vertical scan are checked. If you are convinced that the power supply unit is working properly, then you need to disconnect the lamp and solder all the parts back. This check can also come in handy when doing DIY Philips TV repairs.
Another common breakdown of the TV that can be eliminated is the burnout of the backlight lamp. In this case, the TV receiver, after switching on, flashes the indicator several times and does not turn on... This means that after self-diagnosis, the device notices a malfunction, after which the protection is triggered. That is why there is no image on the screen.
For example, a Sharp LSD TV receiver with this malfunction was taken, although in this way it is possible to repair Samsung TVs, Sony Trinitron, Rubin, Horizon, etc.
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To fix the TV, you need to remove the back cover from the TV. This requires a screwdriver or screwdriver.
Next, you need to be careful disconnect loops from the matrix. 
Thus, you can repair the Philips and LG TV with your own hands, and other LCD panels, as well as devices with LED backlight (LED). Owners of the latter type of devices should read the article on repairing LED backlighting, where the whole process is described in detail using the example of an LG TV.
Among the typical and simple reasons that the TV set does not turn on, there may be a remote control or a lack of signal from the antenna cable.
If the TV does not turn on with the remote control, first, you need to make sure the batteries are good. If they are shrunken, replace them. Often the TV set cannot turn on due to contamination of contacts under the buttons. To do this, you can disassemble it yourself, and clean the contacts with a soft cloth from accumulated dirt. If your remote control has been dropped, it is possible damage to the quartz emitter... In this case, it must be replaced. Well, if you filled the remote control with water or some other liquid, and it did not work after disassembling and drying, then it will have to be replaced with a new one.
You can learn more about fixing the remote control in the following video or article.
When repairing TVs LG, Sharp with LCD, Rubin, Horizon with the same screens, a situation often arises when it does not turn on when the device is in good working order. It turns out that the reason may be no TV signal in the antenna cable. This happens due to the operation of the noise suppression protection (in Rubin TVs, they began to install it not so long ago), and the unit goes into standby mode. Therefore, if you find your TV set inoperative, you should not panic, but you need to check the presence of a signal from the transmitting station.
In conclusion, we can say that when you decide to repair a TV set yourself, you should soberly assess your abilities and knowledge in this matter. If you do not feel confident, then it is better to entrust this matter to a telemaster, especially since nobody canceled 220 V, and ignorance of basic safety rules can entail unpleasant consequences.
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.
