Different situations happen in life, sometimes it is not possible to repair a TV for 500,000 rubles. with the help of a master. Or, sometimes it’s easier, cheaper, faster to buy a new TV than to pay for the expensive service of a TV technician who could understand your model.
The desire to save money and make repairs yourself is quite popular in the CIS countries. Moreover, the breakdown may not be so serious, but the fact of saving money is obvious.
Therefore, below we will tell you about the main components of LCD TVs and their typical breakdowns. Thus, if this does not make you a television master, then at least you will know in which direction to develop this skill.
Main nodes
A modern TV is a rather complex, high-tech thing that is not easy to repair and requires your skills: knowledge of circuit design, the ability to solder, handle all kinds of tools and understand the operating principles of this device and its individual components.
There are not many main components, but they are quite large and in fact are separate devices that interact with each other.
Main components of LCD TVs:
- TV power supply: This is in fact the heart of any electrical appliance. Serves to provide all components of the TV with the required currents, with specified voltages.
- TV inverter: This part converts low voltages from the power supply into high voltages satisfactory for heating the lamps and maintaining their uniform illumination of the backlight.
- Main board: This block is one of the most difficult to repair.
It contains everything to control the remaining components of the TV, so it can also be divided into several components:
- CPU– central processor, serves to receive signals, process them and send signals to subordinate devices. This can be anything up to specialized nodes, such as an audio scan processor, video processor or other complex node.
- Matrix– the image is actually built on it.
- Timing Controller– converts signals from the main board for the matrix, thereby building the image on the matrix in the form in which we are already accustomed to seeing.
Repair of main TV components
A very interesting video about repairing a Samsung TV with your own hands. Enjoy watching!
A description of the breakdown of the main components will help you localize the problem and draw some first conclusions about the type of damage.
But usually, this information is not accurate, so it should always be re-checked, directly when repairing the unit. During repair and restoration work, carrying out diagnostics, you will be able to clarify where the malfunction lies.
- TV power supply. The first thing that indicates a breakdown of the PSU (Power Supply Unit) is when the indicator blinks and the TV does not turn on. Also, there is an option when there is a noticeable delay in starting the TV. Another common situation is when you press “start”, the indicator starts to light up and goes out, in special cases when the indicator turns off, a click is heard. The image disappears, but the sound remains. But keep in mind that problems with PD are not limited to this and can manifest themselves in different ways.
- Inverter (backlight unit). Symptoms can be different, but in general these are problems with the backlight, lamps, brightness (one half is darker than the other). If the backlight does not work, you will also see a dark screen, usually in this case the sound appears and remains in place.
- Main Board. These are usually problems with signal distribution or calculation. May result in picture noise due to incorrect or non-functional TV controls. TV inputs or ports not working. Difficulty setting up the TV.
- Matrix and Timing Controller (T-Con). All sorts of image noise is a sure sign of problems with the matrix. Violations of the color scheme, stripes, white screen - a malfunction of the timing controller. The matrix is usually a durable part, which, if it breaks, is due to mechanical impact (impact) or chemical impact (filled with liquid).
The matrix cannot be repaired, but in general it can be replaced, but it will be very expensive and most likely not cost-effective. – to fix problems with the timing controller, you should contact a specialist, since just a soldering iron and a screwdriver will not save you, it requires fine-tuning work, work with an oscilloscope and most likely very careful soldering, which cannot be done simply with a home soldering iron.
Such breakdowns are typical for any popular brand of TV; they have the same main components and their structural arrangement rarely differs.
Therefore, it doesn’t matter which brand to take, LG, Philips or something else, but each company has its own subtleties.
A short but useful video from which you can clearly watch and learn how to repair one TV unit with your own hands.
Sharp repair
There are countless types of breakdowns, so one breakdown will be considered as an example of describing the process of repairing a TV. For questions about other types of failure of certain parts, contact the Internet if you do not have enough experience to diagnose the device yourself.
Thus, you will receive a description of the process and know what you will encounter.
TV SHARP 14A1-RU on m/s TDA9381PS
Description of the breakdown:
After turning on, when you try to turn on, after 5 seconds it goes into standby mode and starts blinking the LED (LED).
Solution:
First the OS was disabled, the TV successfully started with a dot on the screen. After connecting the OS, the TV worked fine. After turning off the device, everything starts again, all devices that went to the 8th leg of the processor were checked.
Everything turned out to be normal. I checked the data bus; when I tried to access the tuner, the TV went into standby mode. After a long search and sorting through the elements, it was decided to replace the line transistor. Everything fell into place.
. You can find out how to make it and what kind of tool you need for this from our website.
You won’t believe it, but connecting Tricolor to two TVs is very simple! How? Read in this, connection features!
You can find out what makes the surge protector of the Indesit washing machine so special.
The TV started working after replacement.
Let's analyze the problem:
An experienced technician, when conducting diagnostics, would say that the line transistor is normal. Because the crackling of static could be heard. But there were no other signs to double check. And this is not an indication that a crack was present.
The point is to use the selection method to find out what is most likely broken, let’s say in this breakdown, I double-checked everything I could, but it didn’t help. After raising the issue that the TV started without an OS, I came to the conclusion that the lowercase line did not work, thereby replacing the transistor, I got a working TV.
Conclusion
It is quite difficult to learn how to repair TVs on your own; if you have some ordinary problems, then if you have soldering skills, circuit design and knowledge of physics, you will be able to correct minor flaws. Since the solution to such problems is usually not difficult to find on the forms of electronics engineers and television engineers.
But if the problem is original and complex, only experience, working with an oscilloscope, the ability to solder well, work with a soldering station, and solder small parts will save you. The search for parts for repair also plays a role; experienced craftsmen already have their own suppliers of parts and they cost them cheap.
At retail, some parts are rare and very expensive. Therefore, in order to master this skill, you will need to read a lot of literature and learn electronics, and then move on to repairing televisions.
It is certainly possible to repair the TV yourself, without resorting to the services of a television technician. What does this require? Basic technical literacy, ability to hold a soldering iron and the ability to carry out basic measurements with a simple tester. A large amount of information about typical defects that the Internet is replete with can encourage even a doubter to start restoring a broken device. Self-confidence is a wonderful quality, but the likelihood of ending up with a completely “killed” device is quite high. Maybe after all?
So, let's start disassembling. Remove the cover from the TV if it is secured with screws or self-tapping screws. Modern TV models, in addition to fasteners, also have a cunning system of latches, which can be quite difficult to open without breaking them or scratching the case. The craftsmen have experience in opening devices and the necessary devices for this, keeping in mind that the connection of the lid to the body is reminiscent of the device of a modern TV remote control, made entirely with latches.
The back cover is removed and we can see the device of the television receiver:
- power supply, which can be made separately or together with an inverter or LED backlight unit
- motherboard
- inverter or LED backlight unit
- matrix with controller (T-con)
- local keyboard, photodetector
The power supply is designed to generate stable voltages of a given power, necessary for the correct operation of the remaining components of the television chassis. It can be in standby or operating mode, depending on the command from the motherboard. It is the most vulnerable link to external adverse influences such as power surges, lightning strikes, etc. The TV's power supply must use high-quality components that can ensure its uninterrupted operation over a wide range of input voltages in severe temperature conditions.
The motherboard is the “command center” of the entire device. Provides control, switching, adjustments and settings for the TV as a whole. Executes user commands sent 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, RAM chips connected to a central or graphics 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 to illuminate 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 malfunction of the lamp or LED line, but also in the event of a certain imbalance in their operation. Inverter transformers most often fail when diagnosing malfunctions of this unit.
Currently, among budget TVs, models have begun to appear in which all the blocks presented above are made on one board. The power supply, backlight driver, and motherboard are assembled in one unit. The ability to diagnose such a device is hampered by the lack of free access to electrical circuit diagrams and firmware for it. In this case, we recommend turning to professionals. A TV technician will repair your TV at home or in a workshop at a very inexpensive price by today’s standards, will give a guarantee on 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 either it or myself.” After all, no one has yet canceled 220 volts, as well as the electrical safety rules when working with electrical installations. It’s one thing if you permanently destroy the “box” - this is only material loss, loss of health is a more significant thing. Think and decide: “Is the game worth the candle?”
It would be a shame for anyone to throw away a $1000 TV. Obviously, replacing the matrix is a very complex and expensive procedure, which may not even be used for budget models. The issue of repair is of particular importance in large organizations that have craftsmen on their staff. How to repair an LG TV yourself? This question increasingly puzzles users, since not everyone wants to seek the help of specialists. Let's save some money together and discuss the main points.
How to carry out restoration work?
What to do if the TV malfunctions and how to fix it? First I would like to mention the good old CRT models. The percentage of such devices is still high.
The TV has fuses in its design that save the user from force majeure situations (voltage surges, short circuits, etc.). Therefore, repairs must begin with fuses. In a normal situation, zero current flows through this component. Craftsmen began to use this feature for their own benefit: the burnt part will need to be pulled out and connected to its terminals with an ordinary 100 W lamp. This resistance value will act as a current limiter, allowing the circuit to last a little longer.
Important! The same is done when adding limiting resistors to the circuit. The lamp in this case is also an indicator that allows the user to understand whether electric current is flowing.
In a normal situation, the component will blink and go out after turning on the LG TV. It is worth noting that the performance of the device will go a little in the wrong direction.
What other components should you pay attention to? Let's look at the main situations:
- The diode bridge fails. The component is responsible for rectifying the current. If the circuit experiences voltage surges, one of the diodes may burn out. It even happens that two diodes fail at once, so the failure should be determined using a “continuity test”.
- The resistor fails. The purpose of this part is to remove the potential from the cathode ray tube. If a component stops doing its job, a “rainbow” will appear on the TV screen. In this case, the thermistor or inductive loop may burn out. In this case, simply turn off the power and use the tester to identify the problem.
Do-it-yourself repair of CRT TVs is the most common replacement of burnt components, but what about modern models?
We do repairs right
We should not forget about the general instructions. It is advisable to dismantle the main board in order to avoid the possibility of electric shock. First you need to discharge the electrode of the EL tube.
Important! During restoration work, try not to touch metal parts.
This component is located in the area of the rubber gasket:
- Use a screwdriver to pry off the rubber band.
- Rock the component and remove the EL tube electrode.
- Touch the rod to the body of the device, thereby discharging the part. If you can find land, it's best to use it. The most ideal option is a European-style socket that has the terminals connected correctly.
- When discharging, you should hear characteristic clicks. Discharge the component until you can no longer hear them.
- Each TV has a main board, which is responsible for “controlling” the equipment. Remove this part and inspect the radio components on the board.
- If necessary, replace swollen capacitors, resistors and burnt-out elements.
Important! If you haven't been able to repair your TV yourself, it's probably time to replace it with a new, improved model. In our separate review you will find out which ones are better.
LCD devices
Repairing LCD TVs with your own hands - the screen does not light up. This problem can be solved if you know the general principles.
Cases of breakdown of such equipment are slightly similar to those described above for CRT models. Obviously, there are unlikely to be any posistors here, so you only need to establish the reason for the failure of the backlight. Typically, such TVs are classified into two types:
- Based on gas discharge lamps.
- Based on diodes.
Gas lamps have nothing in common with those lamps that hang on ceilings. To check the power supply, it is necessary to dismantle the back wall and visually evaluate the functionality of the wires that go inside the matrix. To do this, disconnect them from the connector and use a light bulb to check their operation.
It also happens that the illumination is provided by a number of discharge-type light sources. In this case, you will need to try to pull out the matrix and turn on the device, looking to see which lamp is not working. If a failed component is found, a replacement will need to be found.
Important! Select components according to your TV model.
In some models, you simply need to remove the lamp from the end without dismantling the matrix. The conductors are located on both sides and covered with a special protective gasket, which needs to be pushed back a little. The light bulb is desoldered and a brand new component is placed in its place.
Important! Also, when installing, consider the location position: side or top. You should not lose sight of those cases when several illuminators are used in one cell.
If there is a horizontal or vertical stripe on the screen, then the root of the problem should be found in the scanning electrode. We recommend that you provide power to another device that has a working matrix in order to confirm this assumption.
Important! It is irrational to replace crystals in budget TV models. Most likely, it will be more profitable to purchase a new device. You may find a suitable model in our publication.
But let's not forget about those cases when the TV is broken, but its matrix is working. Then it is recommended to carry out repairs.
Cable problems
The most common breakdown is cable problems. Most often, they simply step on it, which leads to damage to the core or even the track on the microcircuit. The digital type receiver is made in the form of a small microcircuit with a shielding coating, which is why the assembly is inseparable from the cable connector.
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Modern people can no longer imagine their life without video and audio technology. As a result of regular and intensive use of equipment, it is subject to various breakdowns. Imported and domestic TVs often have poor potential. A posistor is responsible for this function. Another plasma malfunction can be a change in color, interference, or the appearance of light or dark stripes during operation. But sometimes the problem may be with the outlet or power cord. This is only the most minimal description of the malfunctions, as there may be many more problems associated with the TV. Screen faults are the most difficult to fix. If dark or light spots appear on the monitor after a shock or water contact, it is better to immediately take it to a service center, since only a specialist can repair the device.
Before starting repair work, it is imperative to determine what exactly is broken and for this purpose the device is diagnosed. If the TV does not turn on, the problem may be due to a blown fuse. This applies to LCD and CRT TVs. At the same time, as practice shows, the problem may be a malfunction of the diode bridge.
TV repair possible:
- Have it done at a service center;
- Call a specialist to your home;
- Carry out all repair work yourself.
Plasma TVs, unlike tube TVs, have many advantages, as they: have a more saturated image, have a thin body, are characterized by high contrast and wide viewing angles. However, despite all the advantages, like models with a kinescope, they are subject to a wide variety of breakdowns.
All types of faults that arise can be divided into several categories, namely:
- Plasma panel malfunction;
- Failure of the electrical circuit, receiver;
- Problems with sockets, connectors, wires;
- Dust accumulation inside the device.
If the screen is broken, the image may be partially or completely missing. In this case, the plasma panel will need to be replaced at a specialized service center, and you will not be able to repair the TV yourself. If the TV panel is broken, you also need to replace it. If the problem is in the electronics, the image may become distorted and disappear completely. You can repair electronics yourself by resoldering faulty parts or replacing them with new ones.
However, you must have certain knowledge and skills in working with electronics.
If you handle wires, cables or connectors carelessly, certain problems may arise. Faulty parts of an LED TV can be repaired, and in case of serious damage, replaced with new ones. The accumulation of dust inside the case can cause various malfunctions, which is why it is better to clean the device in a timely manner than to repair the TV for a long time.
Features of DIY LCD TV repair
Repairing LED TVs at home can be quite a complex and time-consuming task, which is why you need to pay enough attention to prevention, as this will help reduce the risk of breakdowns.
Preventive measures include:
- The device must be located in a ventilated area;
- Periodically you need to clean the dust;
- You cannot leave static images for more than 20 minutes.
Learning how to repair a TV yourself is quite simple; the most important thing is to take into account the advice of professional technicians. You can learn all the secrets of repairing LCD TVs by watching video lessons for beginners, where everything is described in detail for each brand of device.
Important! Before you start repairing the TV yourself, it is advisable to consult with a specialist, since the cause of the breakdown can be very serious and can only cause even more harm to the equipment .
DIY LG TV breakdowns and repairs
LG is considered one of the most popular manufacturers of household appliances. The manufacturer is constantly improving the production of household appliances, introducing the latest technologies, which allows them to achieve exceptional quality of devices.
Basically, the following factors lead to breakdowns of LGI TVs::
- Getting foreign objects inside the equipment;
- Clogging;
- Poor quality maintenance and improper operation.
Before you start repairing an LSD TV, you need to prepare the appropriate tools and check the device for faults. Then you need to remove the back cover of the device and find the instructions, which will be written in Russian so that you can study the configuration. Initially, the television receiver is inspected, and the reliability of all cable connections is checked. After checking the connections, you need to carefully inspect the cable equipment, because it may be the main cause of the breakdown.
If the cause of the malfunction is the power cord, then you must initially replace it and only then proceed to further diagnostics of the device.
Often LSIDI TVs do not work due to a broken power supply. For the same reason, a computer can often fail. Failure mainly occurs as a result of excessive accumulation of dust inside the device. When repairing an old CRT TV, you need to inspect the base element of the kinescope. All threads must glow. If you have to repair electronic devices for the first time, then initially a circuit design is drawn up.
LED TV models and repairs
Repairing a TV with your own hands is a completely doable task; the most important thing is to first familiarize yourself with the features of the internal structure of the equipment.
The simplest TV models are considered to be::
- Rolsen;
- Samsung;
- Supra;
In addition, among modern TVs, the brands Sony, Panasonic, Elenberg, and Mystery are quite simple in design. Standard faults are the absence of backlight or periodic loss of sound. In this case, it is important to determine the performance of each individual element. In TVs Supra, Samsung, VVK and others, the LEDs located on the strip often burn out. The problem is resolved by replacing them. The reason why LEDs burn out is mainly due to constant overheating of the device and its operation at critical temperature conditions. In addition to replacing the LED, aligning the heat sink is also important, as this allows for better transfer of excess heat.
What to do if your Philips TV doesn’t turn on: DIY repairs
The high reliability of a Philips TV guarantees its long service life, however, in some cases various types of breakdowns may occur. Philips brand equipment is distinguished by its high quality and the difficulty of troubleshooting, since the device is characterized by the peculiarity of its parts, in particular, such as the transformer.
The most common types of malfunctions are::
- No sound;
- Blinking, periodic disappearance or complete absence of the picture;
- Image distortion;
- Lack of response to commands.
In the case of a broken matrix, it is best to purchase another TV, since replacing it will be very expensive. If you do not have sufficient experience in carrying out repair work, you can watch video tutorials or entrust troubleshooting to specialists.
DIY TV repair (video)
LCD TVs are a very reliable and functional device, however, if used incorrectly, if dust and foreign objects get in, as well as if there are defects and many other problems, various types of breakdowns can occur. You can eliminate many types of plasma malfunctions quite simply on your own; the most important thing is to first study the design of this type of equipment.
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