DIY tcl TV repair

In detail: do-it-yourself tcl TV repair from a real master for the site my.housecope.com.

TCL 1418 on 8821CNRG5JB2 processor. If the TV works for 5-10 minutes, then a vertical white stripe appears in the center of the display, and “knocking out lines” starts. I measured the voltage B + (+ 112 V) as it should be.

The cause of the malfunction was the line scan output transistor 2SD1555. And replaced it with a similar ST1803D

TCL DT21368SC 21288 aka SATURN ST-2109B processor 8821CRNG5JB2, and other TVs on the M28 chassis. A squeak is heard in the pulse transformer.

The output transistor of the line scan 3D1555 was broken, replaced with an analogue 2SD1555 and turned on in the operating mode, the protective breaking resistors in the TDKS immediately worked. The power supply of the video amplifiers during the measurement showed + 300 V, while the voltage B + is normal +115 V. As I found out, the malfunction was in the resistor R403 and the breakdown of the capacitor C420 10.0 μF x 100 V. In this case, the OS goes to the "cold" output of the horizontal coils supply voltage SR. It is recommended to install capacitor C420 with an operating voltage of 250 V.
The next time it was turned on, the left quarter of the screen turned out to be black and the image was shifted to the right, the malfunction turned out to be in the TDA9302A microcircuit and the 2SD1555 line transistor. The defect can be classified as typical.

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.

Video (click to play).

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.

Read also: Lsi 48 a ariston DIY repair

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.

TCL T-2139 chassis LK06.
Composition: B.P. TDA16846, BCK80F, + B Adj. Frame output TA8403K, tuner TELE4-801A, TB1238AN, TA8213K, control 13-TCLM5V-R1P 87CM38N-1E75.
The manifestation of a malfunction: the fold of the personnel at the top of the raster, the bottom of the personnel is slightly compressed 1 cm from the edge of the screen. When decreasing the vertical size in the service, the fold at the top of the frame disappears; when increasing, it turns into a horizontal fold. TA8403K modes are within normal limits. The TB1238AN modes are not normal, at the 28th leg (power of the sweeps) the voltage is understated to + 7.4V. Should be + 9c.
Faulty 8.2v Zener diode D833 in the key chain - stabilizer Q805 KSD882. The zener diode has a barely noticeable kilo-ohm leak.

TCL 2560
Ingredients: TCL-A20V07-TO (8857CRNG5DU1), 24C08WP, NJW1136L, TCL79107D5B3, TDA8172, D1556, TDA8944.
Does not turn on. Broken line transistor D1556. Replaced, on - silence, LED
is burning. Unsoldered 5 and 6 legs 24C08WP - TV turned on. I thought how to find the byte in 24C08WP that blocks the processor on TV on. I solved this problem using the WinHex program and the IC-prog programmer, using the method of comparison and exclusion in the dumps of two firmwares. The byte that blocks the inclusion of TV is at the address: 0010hE (57).
The operating value is 37, at 57 - 80 TV does not turn on, or 50 HZ BLOCK. Option in the service menu "OPT". I attach the working firmware and a fragment of the dump. Hopefully, maybe this info will help someone.

TCL 2560_rab.rar 521 Bytes Downloaded: 601 times

TCL DT29326AS chassis M113
When turned on, the bottom of the screen strips chaotically on the screen. With warming up, the stripes move to the top of the screen. Interference climbs in frames.
The culprit S305 220nF * 63V
The malfunction is typical for many TV models.

Hello to all. And again, a TV with a faulty frame scan is being repaired. The repair turned out to be very easy, within the power of any novice TV technician.

So, TV TCL T-14001. I came for repairs with a horizontal strip about 5 cm in size. Within 10 minutes, the screen could expand to 15 cm, and with this size it remained for a long time. According to such signs, it was logical to assume that the problem is in the capacitors, since only they (in rare cases, microcircuits) can restore their properties when heated.

Taking apart the TV, I saw a pile of dust.

Armed with a vacuum cleaner, I cleaned the board a little, and proceeded to a visual inspection.

As expected, near the famous LA78040 microcircuit there was a swollen 1000 uF capacitor C308.

By replacing the capacitor, the TV worked like new.

I spent more time cleaning this TV than repairing myself :).

I don't know how informative this post was, but in view of the fact that there are not many TVs being transported now, I decided to publish all the repairs, maybe it will be useful to someone.

This video is about how to repair an LCD TV with your own hands, there is a defect - there is no image, there is sound. TV model TCL 22B12H (TCL22)

Thank you all for watching my video, subscribing to my channel, LIKE for the video, leaving comments. SEE ALSO:
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Video REPAIR OF TV TCL 22B12H in 20 minutes channel Oleg Borisovich

Your TCL TV is broken.The question arises, what to do, repair the old one or buy a new one ?! How to determine the cost of repairing your TCL TV. The fact is that each TCL TV model has its own typical malfunctions.

According to statistics, 8 out of 10 breakdowns are typical. To determine the cost of repairing a TCL TV (TCL), it is enough to call us, name the model and brand of the TV, and also briefly describe the manifestation of the malfunction. For example, a TV of the TSL brand, model 32TL440. There is no picture, there is sound.

The make and model can be viewed on the back of the TV. Consulting a wizard by phone will help you decide what to do next - buy a new TV or make an application to repair an old TV.

Sometimes the cost of repairs is 50% or more of the cost of a new TV. In this case, you should think about buying a new TV if the old one is not dear to you as a memory or you are used to it. Either way, fixing an old TV is cheaper than buying a new one!

Repair of a TCL CRT TV makes sense if the TV CRT is in good condition. With LCD TVs TCL (TSL), the situation is about the same, if the LCD matrix is in good order, then the repair makes sense.

From the experience of repairing TVs TSL.

TCL DT-21317AS model. There is a narrow horizontal stripe on the screen. The vertical scanning microcircuit STV9302A is out of order.

Fault - the screen is dark, there is sound. Channels and modes are switched, the volume is adjusted, the contours of the image are hardly visible on the screen.

We remove the TV plug from the socket. Next, put the TV screen down on a flat surface so that the stand hangs down. If the stand is in the way, you can remove it by unscrewing the four screws from the bottom. Then we unscrew the screws around the perimeter of the case and two in the center - one large and one small near the connectors. We open the case.

We carefully inspect all components and blocks of the TV for visible damage. We have a dark screen, but there is sound. Most likely, the malfunction is in the backlight elements or its power supply circuit.
The power supply is on the left. The wires from 4 connectors go to the backlight. Nearby is a voltage converter transformer.

Some of the elements of the power supply unit connected to the network are not damaged. But in the secondary rectifier circuit, we see four swollen electrolytes. The voltage across them should be 12 V, in fact it is about 6 V. The capacitors need to be evaporated, checked and most likely replaced. To do this, disconnect the network connector, the main board power connector and the four backlight power connectors from the power supply. We unscrew the four screws securing the power supply board located in the corners and remove the board. We discharge the primary circuit capacitor after the diode bridge. It is better to discharge by briefly connecting a resistor of about 1 kOhm in parallel with the capacitor terminals. We replace damaged capacitors. To be sure, you can measure the capacitance of the capacitors.

The four damaged electrolytic capacitors are rated at 680 μF at 25 V. The actual capacitance of almost all is about 40 μF. The photo below shows the measurement of the capacitance of one of them, it is equal to 36 μF. Others are the same. Of course, this is unacceptable and the capacitors must be changed.

After replacing the capacitors, the voltage across them is 12 V. The backlight voltage converter worked and the TV did the same.

conclusions
1. The failed capacitors are in the 12 V voltage filter circuit, which powers the voltage converter for the backlight circuit, so the screen was dark.

2. When replacing capacitors, pay attention to the permissible temperature of the installed capacitors. It should be at least 105 degrees.

3. The scheme of this particular TV model could not be found. Its chassis is MT35034. There is a similar circuit for the Thomson TV, the MT35 chassis, but the malfunction was not complicated, so there was no particular need for the circuit.

The article material is duplicated on video:

If the TV breaks down, entrust the technician to professional craftsmen. You just need to call a specialist who will promptly repair TCL TVs at the customer's home at a certain time.
Our ReMobi service center carries out high-quality repairs of out-of-order equipment and electronics.Our operator will quickly call you back and answer your questions ›

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Prompt home visit after registration of the application on any day, since we work seven days a week and on holidays,

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TV repair warranty.

Affordable reasonable prices.

We employ experienced specialists who are fluent in modern innovative methods of repair, therefore they perform it efficiently and efficiently. They regularly improve their skills and professional skills. You should not try to fix the malfunction yourself, as the TV is a complex device that is not easy to repair. Entrust the work to a telemaster with the necessary skills and knowledge. We have modern equipment to eliminate any malfunction, allowing you to restore the TV in a short time.
We begin our work by performing a professional comprehensive diagnostics, which allows us to determine the nature of the malfunction, the prices for all types of services.We offer for our customers only high quality of services and favorable prices for TCL TV repair... The cost is determined by the amount of work performed, the replacement of necessary components, the complexity of the breakdown. The wizards will replace the matrix, replace the backlight, display, screen, repair the board, tuners, connectors, firmware, etc. We will provide advice on the operation of your particular device. When placing an order, you must indicate the model, brand, type of breakdown.
We will eliminate any malfunction: image distortion, no sound, does not switch channels, does not turn on, makes noises, dark screen, etc. Call, make a request, and we will help you to cope with any problems.

I ask for help to understand the problem of the TCL TV (see diagram). The problem started out of the blue. On turning on (cold), the frame scan was hitting - the STV9302A microcircuit. I dropped it, put another one, which worked safely (without any deviations in the quality of the picture) for two weeks and just “exploded”. After reading the forums, I came across an advice to change the condender and diode, standing next to this mikrushka. I bought new ones, changed them. As a result, another mikrushka lasted two days. Image - DIY tcl TV repair

.
We bought a third. Still in hand. ). Please tell me how to find the cause of the burnout of the sweep controller, and how to overcome it.

TV repair
Plasma TV samsung 51 inches model ps51d451a3w. Worked the floor.

TCL TV and Chinese antenna
Good day to all. Once upon a time we bought a TCL TV for $ 25 used.

From the TV to the tablet
Kind time of the day to all. Such is the question, in theory, is it possible from Chinese.

Tv disassembly
I will disassemble the SAMSUNG UE32H4510K TV has everything except the matrix. All questions.

18. The microcircuit was soldered, turned on, it worked, but.
The image is stretched vertically slightly - the "reverse" of the beam is slightly visible. That is, the image does not fit into its “frame”. Some voltage beats have appeared, which is reflected in ripples around the edges of the picture.
Everything else works. Only STV9302 gets pretty warm during operation. I did not check the voltage on it at work.
Hence the question - what can be the reason for the increased supply voltage, and how to deal with it?
PS: once upon a time I had the same problem of increased supply voltage in the UMZCH of the music center. No matter how I fought, I did not come up with anything track

Now there is a start of the TV set "with warm-up"). that is, at first it shows, but with waves at the edges, then it shows without waves, but slightly stretched).

PS: here curiosity is already playing - a new TV set or a good used one will still have to buy.

I looked, when I turned on nothing interesting - a clear exponent to the operating voltage and some noise in the region of 30-70mV approximately. True, I used a cheap Chinese digital oscillator (DS0201) for this, but here, on the power supply conductors, something did not pop up especially. And when turned off, the conductors remain charged for a very long time, the voltage does not drop for several minutes, that's for sure - I just didn't look further.

PS: I think that the problem in horizontal beats is precisely in the underestimated tension in the rest of the sections. At my leisure, I hang 2-3 diodes in series in the personnel supply circuits - the power will drop one and a half volts in the shoulder, which will reduce the load on this controller without lowering other voltages.

ZY2: it is a pity that the practitioners in this topic are silent. It seems to me that any practicing "television" would solve a similar problem in a moment.

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 desired 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.

Further, one tester probe can be attached to the body of the device, the other to the previously selected contact, and measure the voltage, having previously connected the telly to the network. In this case, the device shows 1.5 V, instead of the required 5 V. Such readings of the transformer indicate that it is working, but not at full strength. The reason may be dry condenserlocated below, or swollen - above the transformer.

To remove the parts that have become unusable, it is necessary to remove the power supply board. To do this, first disconnect all wires and the matrix cable coming from the inverter and the system board. So that in the future, after repairing the power supply, you do not get confused where what is connected, you can take a picture of them before disconnecting the wires and loops.

Now you can remove the entire LCD TV power supply by unscrewing the 4 screws. After removing it, it is very important discharge all capacitorsto avoid electric shock.

We solder the defective capacitors and replace them with new ones, observing the polarity.

The assembly of the device takes place in the reverse order: the board is screwed into place, all connectors and cables are connected, the rear panel of the unit is closed.

We again measure the voltage on the transformer of the TV's power supply (the device should turn on) and see that it has become 5v. When you unfold the repaired TV receiver, you will see that it works.

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 and lose capacity during prolonged operation, 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.

Next, you need to be careful disconnect loops from the matrix.

The next step is to detach the control panel from the case. You do not need to remove it, you will still need it to turn on the device.

The remaining loops also need to be disconnected. Then it is necessary to remove the housing on which the electronic boards are fixed.

Before removing the matrix, unscrew front frame... We remove the matrix itself and filters, snap off the side mounts.

We connect the power and hold down a few keys to enter service menu... This will keep the lamps on for a while.

The figure below shows that after turning on the lamps, the 5th from the top turned out to be inoperative. Disconnect it and replace it with a new one - now all the lamps are on when checking.

The assembly takes place in the reverse order.

After that, you need to turn on the TV receiver and enter the service menu for reset lamp error counter... If this is not done, the device will not work. Entering the menu, you need to find the corresponding line and reset by selecting ok. Now the repair of the LCD TV set is finished. Tests show that the unit is working properly.

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 valid. 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 in an inoperative state, 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 certainly possible to repair the TV yourself without resorting to the services of a TV master. What is required for this? Basic technical literacy, the ability to hold a soldering iron in your hands and the ability to carry out elementary measurements with a simple tester.A large amount of information about typical defects that the Internet is replete with can induce even a doubting one to start restoring a broken device. Belief in one's own strength is an excellent property, but the probability of getting a completely “killed” apparatus as a result is quite high. Maybe we'll call the master after all?

So, let's get down to disassembly. Remove the cover from the TV if it is secured with screws or self-tapping screws. In addition to fasteners, modern TV models also have a clever system of latches, which can be quite difficult to open without breaking them or scratching the case. Craftsmen have experience in opening devices and the necessary devices for this, bearing in mind that the connection of the lid to the case resembles the device of a modern TV remote control, made entirely with latches.

power supply, which can be made separately or in conjunction with an inverter or led backlight unit
motherboard
inverter or led backlight unit
matrix with controller (T-con)
local keyboard, photodetector

The power supply unit is designed to generate stable voltages of a given power required for the correct operation of the rest of the television chassis components. It can be in standby or operating mode, depending on the command from the motherboard. It is the most vulnerable link in case of external adverse influences such as power surges, lightning discharges, etc. The TV's power supply unit must use high-quality components that can ensure its uninterrupted operation in a wide range of input voltages in a severe temperature regime.

The motherboard is the “command post” of the entire device. Provides control, switching, adjustments and settings of the TV as a whole. Executes user commands from the remote control and local keyboard. It has a developed architecture of data storage devices in the form of Eeproom, Flash, Nand Flash, SpiFlash chips, RAM connected to a central or graphic processor and signal processing devices via the I2C bus - a serial data bus using two bidirectional communication lines SDA and SCL.

An inverter or LED backlight unit ensures trouble-free operation of light sources in the form of lamps or LEDs for backlighting the liquid crystal matrix. It is controlled by commands from the motherboard to turn on and change the brightness of the backlight. They have a serious protection structure that blocks the system not only in the event of a lamp or LED bar malfunction, but also in the event of a certain imbalance in their operation. Inverter transformers most often fail when diagnosing faults in this unit.

Currently, among the TVs of the budget line, models began to appear where all the blocks presented above are made on one board. Power supply, backlight driver, motherboard are assembled in one unit. The possibility of diagnosing such a device is hampered by the lack of free access to electrical circuit diagrams and firmware for it. We advise in this case to contact the professionals. The telemaster will repair the TV at home or in the workshop at a very low cost by today's standards, will give a guarantee for the work performed and spare parts, and will save you time and nerves.

When deciding to repair your TV yourself, you should soberly assess your technical and professional skills and ask yourself the question: "Will I be able to fix my TV without harming him or myself." After all, no one has canceled 220 volts yet, as well as the rules of electrical safety when working with electrical installations. It is one thing if you irrevocably ditch the “box” - this is only material loss, loss of health is a more significant thing. Think and make a decision: "Is it worth the candle?"

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