Why does not Samsung TV turn on plasma. Why the TV does not turn on or does not work

The reasons for the malfunction of the TV are found as trivial, and quite confusing. In any case, it is worth starting with something, and in connection with this, we suggest exploring the insides of a typical TV. Without taking into account the decoding boards of digital signals from satellite or terrestrial broadcasting. Now it’s still difficult because the time has come when all the electronics professionals have gone into hiding somewhere. Either they pay in this area a little, or there is no time to engage in writing works (because they need to earn money). In general, when Mail was asked about the intermediate frequency in the Answers, some kind of utter nonsense was chosen as the best explanation. And the correct post is about the fact that there are two intermediate frequencies for sound on the TV - 31.5 and 6.5 MHz - lost somewhere in the backyard. They made scientists out of the country that it is not clear! And then we wonder why the TV does not work, and no one can help.

How does the TV

And although it has been a long time since the first televisions with kinescopes were put into operation, there have been no global achievements. Unless, of course, we consider microprocessors, which today fill with everything and everyone. Previously, their functions were realized almost on lamps, which took up a lot of space and was hardly more efficient. Now the cascades are assembled into neat chips, there are also some new subtleties with sound, but by and large everything works as before.

The signal path to the intermediate frequency has no division. This means that the image and sound go hand in hand, although they carry different, and the type of modulation does not match. Chip receiver, standing after the antenna cable:

1. Performs a primary sample of the desired frequencies from the entire spectrum using a tunable circuit.
2. It amplifies the received signal directly at the receiving frequency, for example, 570 MHz.
3. Using an internal local oscillator, it lowers the frequency of the mix (sound + video) to tens of MHz (slightly more than 30 MHz).

The output is an amplifier, which is called the frequency of the RF amplifier, but you need to confuse it with a radio frequency amplifier. The amplified signal goes to high-quality filters, for example, on surface acoustic waves. Then it all goes to the block of amplifiers intermediate frequency sound and images. Here are the detectors. The second intermediate sound frequency may be different, for example, 5.5 or 6.5 MHz, depending on the standard. Detectors try to find useful information on all carriers, and if any of them succeed, the microprocessor receives a corresponding message. After that, the control signal he opens the necessary notch filter. The sound passes to the low-frequency amplifier and is output to the speakers.

It is clear that there is also a stereo decoding scheme, just like a TV should be able to recognize video formats such as PAL and SECAM. In each case, according to certain criteria, it turns out that it has come, that only the necessary schemes are used.

Setting the input stages of the receiver chip is the central controller. The one that controls notch filters and much more. A special digital code is decoded by the receiver and contains information about the frequency. Accordingly, the input selective circuits are rearranged by the varicaps, and the local oscillator begins to generate the desired signal. Add to this that, before demodulation, the first intermediate frequency of the sound goes through another conversion. There are two of them. This is necessary to quench the frequency of the mirror channel, ultimately it increases the selectivity and sensitivity of the receiver. That is why in professional radio stations frequency conversion is three or more.

Well, something like that on the fingers of the TV. The signals from the horizontal and vertical scanning were, in analog broadcast, incorporated directly into the signal. Now, when the information is divided into frames, this is not necessary. Moreover, the frequency of frame scanning can now be changed, and the central processor will already adjust the image. Complicated and algorithms. Smart electronics can carry out approximation, prediction of the behavior of the image and sound. At the expense of what reception becomes more confident, qualitative. All these details are not so important, let's get down to business.

If the TV does not want to turn on at all

When the TV does not turn on, the power supply is faulty. Of course, before repairing you need to ring the cord and determine the presence of voltage in the outlet, but by and large you will have to climb inside almost certainly. The power supply of the TV is designed to obtain a set of voltages generated by the secondary windings of the transformer. The small size of the core indicates that the power supply is pulsed.

For TVs, there are special chips of pulse generators and keys, on which it is possible to realize a circuit diagram. How exactly to handle the power supply? Need to get as much as possible electrical circuit. Where? For example, here: http://telemaster.ru/shema/. Even if you can not see the brands of TVs, just look at what chip the power supply is built on. Secretly to say, all these names are not brands at all, but marking electronic assemblies. It is easier, with a fee on hand, you can find what you need. If the specified name is absent, do not hang your nose, first of all, through Yandex, you need to look for analogues (and at the same time a scheme on another site). Surely there is something.

According to the scheme, you can begin to repair. Many people underestimate these "pieces of paper", but only those who have not tried to draw everything by hand or in any program. The scheme is immediately clear where to climb with the tester, where and what will be the voltage. It is also useful to get the so-called Data Sheet (specifications) for each chip, because foreigners (unlike our manufacturers) often supply their, even cheap, products with detailed documentation. Inside you can find the connection nuances, and it's better than trying to immediately take the bull by the horns.

The power supplies themselves are pulsed. The demagnetization loop (often with a posistor) is usually placed only on kinescopes and only on color ones. The steel shadow mask magnetizes and begins to deflect electrons. As a result, the picture is not what it should be. Poistor also reduces the amplitude of the demagnetizing field with time. The fact is that the resistance of this element increases with time due to heating. As a result, the picture on the screen remains clear. By the way, if the fuse constantly flies out, then in many TVs with a cathode-ray tube the case is exactly in the posistor and the demagnetization loop around the perimeter of the kinescope. Try to remove the power off the wire around the screen (from the inside of the case) with the power off. If the TV started working, it is the posistor that is faulty.

Otherwise, you should follow the scheme from the entrance to the exit:

• Harmonic filter from inductances, resistor capacitors.
• Diode bridge.
• High-frequency pulse generator.
• Power key with radiator.
• Transformer.
• Rectifier diodes.
• Output filter

In addition, power supply elements are often used in power supply units, like varistors, which dramatically decrease their resistance with increasing voltage, closing the current to ground.

If there is no sound on the TV

If the sound does not work on the TV, the root of evil lies most often in the settings. For example, if the built-in speakers come to life via HDMI from a home cinema sensor, the low-frequency amplifier works. And the cause of the breakdown lies either in the breakdown of the sound detector, or of one of the notch filters, or in the malfunctioning of the microprocessor. Let's say right away, if there is an image, then the breakdown has crept in not earlier than the detector unit, where the sound is converted to the second intermediate frequency. Otherwise there would be no pictures. There is a scant chance that the sound was cut off by the filters before, but the probability of such an outcome can be considered almost zero.

Thus, troubleshooting begins with the settings and smoothly moves to the detectors and filters. It is useful to flip through channels from different broadcast stations. If there is sound at least somewhere, then there is a break in the filters.

TV screen shows nothing

When the TV screen does not work, the problem is most often in the backlight. And this is closely related to the inverter. Using our findings made earlier, he claims that before the block of detectors and notch filters, the fault could not creep in. Otherwise there would be no sound. There is also an update mode, in which, with the screen off, the system requests a new firmware from the server via the Internet connection. In this case, after the end of the operation, the TV will turn itself off.

Other TV malfunctions

Finally, if the remote control from the TV does not work, then first of all the batteries are checked. Secondarily, the buttons are to blame. Inside the console there is only a transmitter that encodes keystrokes. Nothing special to break. In rare cases, the receiver breaks on the TV. Most often, the radiation is infrared, so it does not pass through objects. Try cleaning the glass covering the sensor and emitter.

When the buttons on the TV do not work, the reason is usually that one of them burned down. As for the touch panels, they burn from voltage drops. Operate the equipment carefully, and there will be no question why the TV does not work. At this we say goodbye to our readers. Some may be interested in in-depth technical details, but they are specific to each TV model. We give only general recommendations.

Despite the diversity of types, types, models of televisions, the reasons for which they may not turn on or turn on, but do not work, always the same.   The problem is that the possible malfunctions in such cases are very lot.

Only an experienced master can determine the exact cause of the failure of a kinescope, plasma, liquid crystal or projection TV.

Highly qualified masters of the service center AllRemont24 have a huge experience in working with various brands and models of television sets, they can repair or replace any defective part with a similar one.

Repairing the TV yourself, not having the knowledge and experience, is unsafe for health and life, and trusting repairs to a non-professional - putting yourself at risk of the final breakdown of the faithful “friend” will have to buy a new one.

The best way out of this situation is to order a TV repair service in your own home in Vseremont24 company. However, before this it is recommended to perform a series of verification actions to make sure that repairs are necessary.

Often the problem is not turning on the TV is ridiculously elementary things that are eliminated in seconds.

If the LED is off

When the TV does not react in any way to your attempts to turn it on and at the same time the indicator on its case does not light, there is some problem with the face electricity.When the indicator light burns out, the TV still works. When there is no indication - there is no electricity.

Possible causes   power failure:

• the house turned off the electricity
• unplugged machine in the dashboard,
• the outlet to which the TV is connected is faulty,
• the extension cord through which the TV connects to the outlet,
• any wiring problems.

You can independently check the serviceability of the extension cord, sockets, as well as watch the machine and click them several times. You can easily fix some problems yourself (for example, reconnect your TV to a known-good outlet), you will need the help of a wizard to eliminate others.

Please note that the traditional problem of lack of electricity in cRT   TVs - blown fuse. This item is replaced by a new master.

Malfunction of any part   may cause failure in the operation of televisions and other types. What could break on the TV? Control system, microcircuit, capacitor, power supply unit - anything!

Only a professional can carry out diagnostics of various TV units and carry out all the necessary repairs quickly and efficiently. Master VseRemont24 in a matter of hours “will bring your television back to life”!

If the LED on your TV is lit, this is a good sign, it means electricity to the technology. Why in this case, the TV does not turn on?

It all depends on how you try to turn it on. If you do this from the remote control, this device may be broken.

Check the console:

• presence and serviceability of batteries, their polarity, contacts (could oxidize),
• radiator integrity
• buttons and the body of the remote.

It is recommended to disassemble the console and clean it from dust (even if it does not help, it will not be superfluous). Ask the household if they have not spilled water on the console. Something else could have happened that caused this device to fail.

A faulty remote can be repaired by the master Vseremont24, who came to your house. In some cases, repair of the remote control is impossible or better to replace it with a new one.

If everything is OK with the remote control or if preventive measures have failed, try turning on the TV. using the control panel buttons.   At the same time, check whether the “network” button on the TV is turned off (it is on the bottom, on the side or on the back wall).

When you can not turn on the TV and the control panel, there are two problems:

1. Due to power surges or power outages protection worked.   Not always in this case, the TV does not turn on at all, sometimes it makes such attempts, but then it goes off.
2. Due to short circuit tV control electronics out of order, specifically - the processor.

If in the second case, independent repair is not only impossible, but potentially dangerous   (without hesitation, call to your master's house!), then at first, you can perform a series of actions capable to solve a problem:

1. Unplug the TV from the outlet.
2. Wait a while.
3. Try turning on the technique again.

If surges and power outages are an eternal problem in your home, it would be advisable to supply:

• network filter,
• stabilizer.
• bespereboynik.

Always turn off the TV completely when you leave home!

Other causes of TV malfunction

If the LED on your TV is not lit but blinking, it will reports an error.   The fact that this is a mistake, you will know if you find and carefully read the instruction manual, section on the indication of the types of faults of the TV.

The TV indicator also flashes when it performs the function of a computer monitor ( connected to computer). Check whether the computer is turned off and whether it has entered sleep or hibernation modes. In this case, everything is in order with the computer and TV, the first one simply cannot transmit the image to the second one.

It happens that the TV does not turn on because wrong selected mode of operation.   For example, in AV and PC mode, the TV “falls asleep”. Turn on TV mode and enjoy watching your favorite shows!

As with any other technique, televisions can fail and suddenly fail. However, these failures occur regardless of the timing of the device. For example, sometimes the TV does not turn on. When trying to turn it on, the various indicators blink again and click the relay. There may be other "symptoms". Let's look at why televisions refuse to work and what to do in such a situation.

Common causes of faults

This problem may appear for a variety of reasons. It happens that the LEDs blink as usual, but the TV still does not want to run. Also, the indicator lights up red, but the device cannot be controlled from the remote and does not turn on. Often, the TV does not turn on either from the remote or from the button. The indicator does not light up on the case. Another symptom - inside the case something clicks, buzzes. The device makes different, sometimes quite strange sounds, but still does not turn on.

LEDs blink

If they are flashing on the case, it means that the device performs its own diagnostics and will soon find out the cause of the problem. Often on different models you can observe that the lamp or a certain number of times. So he reports a specific error. Part of the codes to them can be found in the instruction manual. TV manufacturers such as Sony, Philips, Panasonic and others have a self-diagnostic function. The central processor of the data bus receives information from the main devices and units. If a failed node is detected, the processor will block the power up command. Therefore, if Phillips TV does not turn on, but the indicator is flashing, you must read the error and decipher it. Then you can try to fix the problem. Also, a similar symptom appears when the TV panel plays the role of a computer monitor. If the PC went off or turned off, then when you press the power button on the remote control, the LCD panel flashes several times with the LED.

Indicators are always on

A glowing diode informs the user that the power supply unit of the device normally receives the supply voltage. What to do if the TV does not turn on and does not respond to signals from the control panel? The first is to try to turn it on using the buttons on the TV itself. Perhaps the malfunction is due to incorrect operation of the console or some errors associated with it. But it’s really not the TV itself that’s to blame.

  If the LG TV does not turn on and similar symptoms are observed, then the whole thing in the ceramic resistance of 4.7 kΩ. It is located near the processor - it is a cliff. Replacing a resistor will help restore device operation. You can take several actions. First of all, it is checked whether the batteries in the remote control are working and whether the contacts have oxidized. Next, check the infrared emitter and its integrity. Then diagnose the buttons. They can stick, which is why the panel does not respond to commands. If the Samsung TV does not turn on, but the indicator is on, then the reason should be sought in electronic components. Something provoked a change in the properties of the capacitors, so the power supply can no longer provide the device with a normal start. The only caveat - determining the localization of this fault will take some time.

Also, experts recommend to disassemble the control panel and clean it from the inside. They often accumulate dust. This does not in the best way affect the operation of the device. If the console was filled with coffee, beer or any other liquid and can no longer work, then it is easier to buy a new one. If, after pressing the buttons on the control panel, the LCD TV does not turn on, then there are only two possible options why this happened.

Protection

This is one possible reason. In this case, the TV can make attempts to start, but literally in a few seconds the screen goes out or completely stops responding to all attempts to start it. The main and popular cause of this problem is a power failure in the home network. The power system in modern TVs loves stable and high-quality voltages. The most effective way to help solve this problem is to completely de-energize the device. You can do this by pulling the plug from the outlet. After a while, the device will recover. If there are constant problems with voltages, then the best solution is to turn on the TV through stabilizers, uninterruptible power supplies, or at least through standard network filters. But best of all, if you want to avoid such problems, turn off the panel when leaving the house. Then you will not be wondering why the TV does not turn on.

CPU faults

Modern TV panels are equipped with a huge amount of control electronics. Schematically, they are small PCs with a separate CPU that manages all the important processors.

  For example, if we consider the circuit diagram of an LED TV, then it can be seen that the control voltages on the LED diode come through a Stand-by contact and a transistor. If there is a short circuit, then the TV will not turn on. Then you can not do without contacting specialists in the service center. Of course, if you have the knowledge and necessary skills, you can try to fix the problem yourself. However, the trouble is that in free access there are no electrical circuits of TVs. And without them, repairing the panel is very difficult.

TV does not turn on, indicators do not light

These symptoms are directly or indirectly associated with a lack of electrical power. If the lamp simply burned out, then the device would function normally (no indication). If this happens, then do not panic. First you need to eliminate all possible faults that are corrected by yourself. But there are situations and more difficult. For example, the LG TV does not turn on, and the problem lies in the breakage of the resistor-fuse.

Through these resistors, a voltage of +12 V is applied to the circuit. After replacing an element, the TV operates as usual.

No voltage in the outlet

Sometimes invisibly shut off circuit breakers in switchboards. There are malfunctions in the outlet itself. This is diagnosed using an indicator or a multimeter. If there is no power, check the machine. If it does not help, change the outlet.

Faulty extension cord

This is a common reason why the TV does not turn on.

You can check it simply - if the device is working from the outlet, but does not want to run through the extension cable, then the problem is clearly in the wire.

Wrong mode selection

It often happens that a person accidentally or intentionally chooses inappropriate modes of operation of the device. In this case, the TV may turn off and not turn on or go into sleep mode. In this case, resetting to factory settings will help.

Electronic components faults

As already noted above, if the Philips TV does not turn on, this is due to the defective electronic components. For example, for some reason, resistors or capacitors burned. Current problem - fuses.

It is better to entrust the diagnostics and repair of such faults to professionals. Self-repair can be very expensive. If the Philips TV does not turn on, it is connected with a punched capacitor in the power supply. As a result, 13 V is supplied to the circuit instead of the required 18.5. This is often the cause of failure. Without the necessary knowledge to identify this problem on your own is very difficult - this is the work of service engineers.

Conclusion

If the Samsung TV does not turn on (and this applies to any brands), then this does not mean that it is irreversibly broken. It can be revived using simple ways. But if the problem is in capacitors or a resistor, you should not take up repairs without proper experience.

As soon as television became firmly established in our homes and became widespread, it radically changed the life of a person, his leisure and his outlook on life. And now, if something happens to the TV, many people start a real panic. What to do when suddenly it crashes and the TV does not turn on, and the LED flashes or does not light up?

Modern TV does not turn on, and the indicator is on: what to do

If the TV does not turn on, it is best to contact the service center. But, if today is a day off, or trouble has happened in the evening, then you can try to fix the problem yourself. First of all, you need to conduct a preliminary inspection of technology.

Instructions attached to the device, gives full recommendations on this issue, and how to fix some basic, particularly frequent and uncomplicated breakdowns. Sometimes the problem of not turning on the TV may be in the wrong connection of the device, and that accidentally pressed, and maybe the off button is damaged. Could, also, burn the power supply.

Before looking for a solution to solve a problem, it is necessary to determine exactly the type of device you have: LCD, plasma TV, or CRT. Currently, they produce both liquid crystal, and kinescopic, and plasma devices. If one of them broke, there will not be any special differences in the repair, because the difference is only in the “design”, and the internal device of the device remains the same.

TVs almost always have various problems, but all of them at first glance have approximately the same signs:

• The indicator is constantly flashing red and green;
• The device clicks, buzzes, cracks or whistles;
• The indicator light does not work at all;
• The TV does not turn on, but the indicator lights up blue.

Equally characterize a broken device will also immediately lack of response to pressing the buttons of the remote, and a complete shutdown at the time when the power supply is turned on. If the plasma does not start right away, try again.

TV "Samsung" does not turn on: the red light flashes and beeps

Before you start troubleshooting, you must re-try to turn on the TV. It is very possible that the problem is hidden in the power button, if that one, for some reason, did not work stably. The indicator light may either be on or off. Therefore, special attention should be paid to it.

Many of those who purchased the Samsung TV models le40r81b, le32r81b, le23r51b, le40s62b, le20s52bp are faced with the problem of not turning on the TV. At the same time, the light is on, but there is no damage. Do not panic. In addition, it is necessary to understand that the wine is not in the manufacturer of the equipment. With a product of any brand, such a nuisance may occur.

One of the most trivial problems is a breakdown in the wall outlet or, in general, the cause of the blackout. You need to analyze the wiring for a fault. Perhaps the failure lies in the panel or connector, which simply turned off or stopped working due to a power surge. Sometimes the reason lies in the complete absence of electricity. You can check the outlet by plugging in another device or device. If there is no power in the whole apartment, then it is necessary to examine the automatons. If everything works for the neighbors, and your apartment is de-energized, and you have not identified any visual reasons, you need to contact a specialist. Let the master on duty himself take the necessary measures.

If the TV does not turn on and the indicator does not light, you should:

• Check the condition of the outlet in which the device is switched on;
• Analyze the integrity of the instrument network cable;
• Check the mains voltage throughout the apartment;
• Ask if the neighbors have stress.

Only if there is a positive answer to all the questions, it can be assumed that the fault must be sought in the device itself.

Why Philips TV does not turn on: what to look for a problem

If the light is on, and the TV does not turn on, it can be assumed that the consumer has incorrectly applied the active mode. Many newer instruments have functions that allow you to enter a “sleeping” state. With this turn of events, the TV should respond to the remote. You just have to go to the menu and turn on the TV mode.

In case your Philipstea1507p TV is connected via an extension cord, you should check when it has any parts damaged, like chips or a capacitor, or the power supply and buttons. In this case, it is best not to try to solve the problem yourself. Your wrong actions can only harm the device even more.

If you intend, nevertheless, to try to repair the device yourself, then study the instructions carefully and follow only its instructions. Begin by trying to turn the TV off and on again. If your TV model is relatively new, and recently acquired, then it should not have global problems. The simplest failure can be a faulty power button. It may simply be disabled. If the indicator light on the TV is on, but the device itself does not turn on, then it’s okay with the power, the device just didn’t turn on the first time. Do not look for other reasons yet, just try to restart the device.

To start the system, try the following steps:

• If the indicator does not turn on from the remote control, then try to turn on the device directly from the control panel of the TV itself. Maybe you just have a faulty console, or batteries are dead.
• When the TV does not want to turn on from the TV panel, then you need to pay attention to the standby mode indicator.
• A dark screen will also be at a weak transmitted signal, or if the antenna is badly stuck.
• Sometimes after turning on, the TV screen lights up, and after a few seconds it turns off again. This may mean that one of the device's chips is broken, and its quick shutdown is a simple protective function. If the device goes into protection, you should call the telemaster.

If the TV turns on for a long time, the cause may be a malfunction of one of the TV units. Different models of TV breakdowns can be very different. Identifying serious problems without proper experience is difficult. It is better to give it in for repair to specialists.

LG TV does not turn on: flashing light

As with any household appliances, the TV is characterized by malfunctions. This can happen regardless of the lifetime of the device and the manufacturer.

When the relay indicator blinks, the LJI series 42pa4510, ld33b, 42ld650, 42la621v TVs themselves give a signal that the device has a problem. Usually the red light should flash a certain number of times. You just have to open the user manual and find a section in which the types of breakdowns are indicated and their indication, with which the device reacts to the problem.

Another option that can cause a similar symptom appears when the computer is connected to the TV as a monitor or player. If the latter went into “sleep mode”, and maybe completely turned off, the TV will give a signal with an indicator when turned on by the remote control for a few seconds.

According to this principle, modern televisions and the following companies work:

• Samsung le37c530f1w;
• Philips;
• Rolsen;
• Akira;
• Toshiba (Toshiba);
• Mystery;
• Bbk (Вв, ББК) led2452fdtg, lem2488fdt, led;
• Dns (DNS) m24dm8;
• Sony (Sony) Erickson, Erisson, Bravia;
• Dexp;
• Hyundai (Hyundai, Hyundai;)
• Helix;
• Supra (Supra) led;
• Sharpe;
• Vityaz;
• Thomson;
• Prima;
• Jivisi;
• Novex.

Overheating of the internal parts or housing of the TV is a very frequent problem for modern appliances. In this case, the non-inclusion of the device, a dark indicator and clicks will make you know even in a working model. Let the device rest for a couple of hours, and everything will be fine. Also, TVs will whistle, and the indicator will not turn on if the power supply is too heavy. Replacing a transformer, transistor or chip you can solve the problem. If the old TV has turned off, or the old TV has gone out, then the master should search for the reasons.

Attention, only TODAY!

Probably, many are familiar with the situation when the TV stopped giving signs of life when the owner intends to turn it on. Now we calmly relate to this, because we understand that you can use another TV in the next room or in the kitchen, and fix the faulty device over time. But, if you look back thirty or forty years ago, the refusal of the TV to turn on would be perceived as a big trouble. TV then, despite the ideology of programs, for many people was the only window into the world. Skipping the series “Seventeen Moments of Spring” was by no means impossible, and experiences about this seemed quite reasonable.

There is no doubt that the equipment has become more reliable and technological over time, its weight and dimensions have decreased, many new user and multimedia functions have been added. However, at present, as well as at the dawn of its formation, television receivers are sometimes subject to failures when turned on. The reasons for this may be quite a lot and not always the “culprit” of such strange behavior is the apparatus itself.

Make sure the opposite is easy. You need to check the electrical outlet, which is inserted into the wire from the TV. Plug in a desk lamp and make sure it works. Remember where your device has a power button and whether it is at all. This is not a joke, many owners forget about its existence, using only the remote control.

The range of television receivers is so diverse and wide that even the master on the TV in the not very well-known model will need some time to discover the network switch. These elements of the scheme are used to hide in secluded corners and grooves, below, side, back and be completely invisible. Accidentally touching this button and not noticing it, then you can wonder for a long time the question "Why does the TV not turn on?"

We repair ourselves or trust the TV master?

Of course, situations with a button or a bad outlet are not typical and are quite rare, but with checking these things you should start diagnosing the reasons why the “box” does not want to turn on. Most often the receiver itself is to blame and the owner has to make a decision, call the master or fix the TV with his own hands.

For many men who consider themselves technically literate, it does not seem so difficult. “It’s just that you need to replace the fuse or something else, and for repair you need a tester, a soldering iron and a circuit,” some confident people think so. However, the desire to repair the device independently can go into decline after the cover is removed from the device and access to the boards and blocks of a modern TV is gained.

The fuse, as we used to see it, in the receiver, most often, is one and in most cases intact, if there were no farce-major circumstances in the form of a thunderstorm or large voltage surges in the electrical network. It may well be that the fuse on one of the boards burned out, but most of the "fuses" are now done in the SMD package and the search for the faulty one can be delayed, since there may be dozens of these components, and they are located in any television unit. It is rather difficult to determine visually their presence in the circuit and distinguish it from similar in appearance capacitors or resistors without the proper skill.

Let's say the searches were crowned with success. Here it is - the burnt "fusion" (fuse - fuse), which must be replaced and the hope that the TV will once again delight us with juicy scenes and soulful stereo sound, will become a reality. However, joy can be premature. Questions should be asked: "What is the rating of the faulty fuse?" and "Why is it burned out?" If you do not think about these things and just solder a wire instead of a spare part, you can discover a lot of new things: see the smoke from a large chip or hear the crackling of exploding transistors. This means that you did not find the cause of the blown fuse and, as a result, significantly increased the cost of further repairs.

In a telemaster with experience, a socket for a fuse in a power supply unit wrapped in haste with a wire causes sacred thrill, horror in the eyes and an understanding that this apparatus cannot be quickly and painlessly restored, it’s not a lot to earn, and changing the fact that in ordinary life it has no habit of breaking down. The most unpleasant thing in this case is unpredictability and lack of logic when searching for defective parts.

Situation analysis and assessment of factors affecting the occurrence of a malfunction is an integral part of the experienced skills that an experienced person possesses. Find the root cause, due to which the various components of the television chassis can fail, including fuses - the main task of the specialist. It is impossible to repair, hoping for the "chance", without having a firm confidence that the defect will not happen again in the future.

A simple example. Panasonic Kinescopic TV does not turn on. Measurements show that a 56-volt Zener diode is punctured in the voltage shaping circuit of a tuner that performs a purely protective function, and its presence or absence in a properly functioning chassis is not at all necessary. Due to inexperience, when repairing it yourself, replacing this part leads to its re-burning. If the Zener diode is not installed at all, the TV can turn on and work for a while, until the line transistor, the personnel chip or the line transformer burns out. The reason for this behavior is in an overvoltage, which the power supply gives out, and even deeper, in the loss of the nominal capacity of two electrolytic capacitors of 47 μf. in the primary circuit of this unit. This is the root cause of all troubles.

Much more can be said about why the TV does not turn on. This note focuses on the human factor in such a situation and on the fact that always when repairing a TV, as, indeed, any technically complex device, you should look for the cause and eliminate the consequences caused by it. Not always trying to restore the performance of the TV on their own can end in luck. One has to be ready for such a turn and think a hundred times before deciding to take this step. May be worth