DIY TV repair

Material is added to the pages as data accumulates from the available technical documentation, personal author's experience and from the masters of repair forums. More details.

Technical description and composition of the IZUMI TLE15H400B TV, panel type and modules used. The composition of the modules.

T-CON: LP156WH2-TLQ1 P / N: 6870S-0703F

Power Supply (PSU): adapter DC 12V, 4A

IC MainBoard: 25Q80BV, 24C32, YD1517P

Specifications TLE15H400B

It is advisable to start repairing the IZUMI TLE15H400B TV with a careful external examination of both internal and external elements. It often happens that visible damage to elements or connections helps to determine the direction of troubleshooting. If charred resistors, swollen electrolytic or sintered capacitors, ring cracks in the soldering of the terminals of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction, as well as to check the connected elements and assemblies.

If the IZUMI TLE15H400B TV does not have a picture, but there is sound, a malfunction is likely in the LED backlight circuits of the LP156WH2 panel. It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the PSU (power supply) for an overestimated ESR.
Often, in the absence of backlighting, disassembly of the panel is required. It is necessary to check the serviceability of the LED transitions, as well as the reliability of the contact connections in the lines and connectors.
It is impossible to check the LED bars for a break without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally a current source.

The LA.MV6.D2 0343 motherboard must be checked if there is no response to the remote control and function buttons, the standby indicator blinks or is on continuously. In such cases, if the converters or power regulators of the microcircuits are working, it may be necessary to update the software.
In some cases, it is necessary to check or replace (if necessary) elements of the MB (SSB) board - 25Q80BV, 24C32, YD1517P. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.
Before replacing the HFT-8F / 125CW tuner, if there is no tuning to the channels, you must first check the supply voltage at its terminals, including the supply of varicaps (30-33V).

Attention! Users and owners of TLE15H400B TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.

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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Do-it-yourself TV repair is a responsible business, since today a large number of different models (LCD, LSD, CRT) are presented on the market, each of which has its own technological features.Therefore, the approach to each type of TV is individual; in some cases, special skills will be required (knowledge of electronics, experience with a soldering station).

Before proceeding with the repair of television equipment, it is necessary to find out the cause of the problem.

The most common problems are:

1. TV screen does not turn on - this can happen with an old picture tube screen and with the most modern television panel. Basically, this symptom is characteristic of a blown fuse. When repairing, it should be borne in mind that the appropriate fuse must be selected for each model. And also experts recommend paying attention to the diode bridge, power supply, wire, perhaps the cause of the malfunction lies in these elements. Read also what to do if Samsung TV does not turn on.

1. Faint, barely noticeable picture - such a breakdown happens with LCD / LCD monitors. The most likely cause of the malfunction: faulty diodes, device backlighting.
2. There is no sound, the screen "wheezes" - most likely, the sound amplifier or microcircuit is out of order. Also read what to do if there is sound, but there is no picture.
3. Monitor is on, no picture - Perhaps the cause of the problem is in the video processor or in the receiving unit.

You should be aware that if a darkening of the board or rupture of elements is detected during a visual inspection of television equipment, then it is not recommended to immediately start replacing parts. Since such factors indicate a short circuit that could have occurred in another section of the TV. Therefore, if you do not eliminate the cause of the short circuit, but simply change the failed elements, then the situation will repeat itself.

To repair television equipment, the following tools and equipment may be required:

• Screwdriver Set;
• hex keys (in rare cases);
• pliers;
• soldering station (for repairing modern monitors);
• screen layout (can be downloaded on the Internet);
• multimeter;
• oscilloscope.

Many LCD screen problems can be dealt with on your own. But you should know that these screens require more careful handling than, for example, CRT TVs.

First of all, the user needs to study the instructions for his model, and only after that start repairing the LCD or LED screen. You should be aware that LCD TVs use fluorescent bulbs for backlighting, while LEDs use LEDs.

The TV may not function due to lack of power, to check this, you need to do the following:

1. Open the back cover of the LCD TV with tools.
2. Disconnect the wires that are connected to the device matrix.
3. Connect a working light bulb to the contacts.
4. Some panels have more than one light source, in which case they must be tested as well. This can be done as follows: pull out the TV matrix and connect it to the network, it will immediately become clear which lamp is out of order.

After the faulty luminaire is found, it must be replaced. This procedure should be carried out as carefully as possible. In most cases, the lamp can be taken out even without removing the matrix - you need to move the protection elements and get the burned out part using a soldering station. Then a new lamp is installed in the same way.An important rule is that the new lamp must be completely identical to the old one.

Another common problem with these models is damage to the monitor. But in this case, it is not advisable to repair LCD TVs, since it is easier to buy a new screen. This test scheme can also be used to repair plasma televisions of all types. Read also how to fix the LED backlight yourself.

Each manufacturer has its own weak points, so below is a selection of the most common LCD screen breakdowns.

Often, users of this brand are faced with such a problem that when turned on, the device beeps without interruption. This symptom usually indicates that a leak has occurred. It is recommended to try replacing the preout stage diode.

Another common problem is that the monitor turns on and off itself. The main reason for this breakdown is a failed transistor, it is necessary to replace it. It is recommended that such malfunctions be eliminated on their own only by people who have experience in repairing television equipment.

DIY Philips TV repair is recommended if the problem is minor: settings are lost, cable replacement is required.

If the breakdown is complex, then it is better to entrust its elimination to specialists who will not only professionally perform repairs, but also issue a guarantee. Therefore, if the repaired screen stops working again, the user may demand a refund.

LG flat screen owners may have a problem saving settings. Such a problem does not require contacting the masters; you can repair your LG TV yourself. It is enough to switch the device to another operating mode, and all settings will be saved.

As well as in the case of other LCD models, if the problem is serious, then it is not recommended to repair an LG TV with your own hands, it is better to contact a specialist.

Despite the fact that today most consumers prefer the most modern plasmas, CRT screens are still in demand. These TVs have their advantages: they are inexpensive, easy to operate, and the quality of the transmitted picture is still high.

The main problems with CRT devices:

• the CRT TV does not turn on - just like on devices of a different type, first of all, you need to check the integrity of the fuses;
• a diode bridge malfunction is a common problem with CRT receivers, you can fix the TV only after making a "ringing", you will need a multimeter from the equipment;
• breakdown of the posistor is considered the most serious problem; in order to check, it is necessary to turn off the TV's power circuit, then start it again. After, observe the lamp, if it goes out, it means that the posistor is out of order. First of all, you need to adjust the resistance of the network, and then replace the part;
• burnout of a transistor or capacitor - such a malfunction can be easily replaced by visual inspection (on black carbon parts), repair is carried out by replacing the part.

Below is a list of problems encountered by owners of CRT TVs.

1. The Rubin TV buzzes loudly when connected - most likely, the photodetector needs to be replaced.
2. The ruby ​​does not turn on, the indicator does not light up - voltage surges in the transistor.

1. The Horizon TV does not have a blue tint, as well as the white balance is disturbed - this is mainly due to a broken resistor.
2. There is sound, no image - the cause of the problem lies in poor contact of the power connector of the screen board. It is recommended to use a soldering iron to solder the harness into the Horizon TV board.

1. The screen does not turn on - there is a problem with the power supply.
2. A horizontal strip appears on the monitor - repairing a Vityaz TV consists in fixing a problem in the frame scan microcircuit.

Since the malfunction of the power supply is one of the most common problems of all types of TVs, it is necessary to study it in more detail.

Since all models of LCD monitors do not have fundamentally different design differences, therefore, the diagram below can be applied to all TVs (Toshiba, Horizon, Samsung, Sony, Rubin).

Repair of monitors equipped with a picture tube, for example, such as (ruby, sharp 2002sc, sony trinitron, vvk), as well as repair of Samsung TV, Panasonic. always starts checking the power supply.

Testing is carried out using an incandescent lamp, but before performing the procedure, it is necessary to disconnect Sharp c2002sc, Samsung or another screen from the load (horizontal cascade). The horizontal scan voltage can vary from 110 to 150 V, it depends on the size of the picture tube. It is required to find a sweep filter capacitor in the TV circuit. Next, you will need to connect a light bulb, in order to remove the load, it is necessary to unsolder the choke and the fuse through which the JV element consumes power. This scheme is used for sharp screens since 2002sc.

After that, connect the power adapter to electricity and measure the voltage, if the values ​​exceed the norm, you will have to check the feedback circuit of the power supply. If the power supply unit is in good condition, then the light bulb is removed and all the elements are soldered into place. This is the basic information on how to repair a TV with your own hands.

The master said that it is necessary to change the LEDs, where to buy the native LEDs for the izumi TV, for some reason others do not fit?

It is forbidden to write answers that do not bring any benefit to the questioner from the series: “bring it to the service”, “contact the ASC”, “unprofitable”, etc. Answers like these will be considered a rating cheat, the answers will be deleted, and the account will be blocked.

If you undertake to help people, answer fully. Explain why, if you recommend, for example, reflashing your phone, then write how to do it. If you write that repairs are unprofitable, explain why.

If the screen is completely black, it is not necessary that the case is in the diodes, the problem may also lie in the backlight controller, and several names of diodes are selected, as a rule, according to the form factor and characteristics.

Brought in for renovation, an amazingly simple TV model IZUMI TLE32H330B. As always, in such low-budget models the matrix (panel) is made as a separate module, and the back cover is made as a connecting module (bracket) for all boards. A very long LVDS cable leaves the lane, which strives to get under the self-tapping screws of the lower stand. The cost of such a TV corresponds to its quality. He looks remarkably like a TV model. DNS M32AM8, as well as IRBIS S32Q77HAL. And their malfunctions are the same typical - software crashes for no reason. And this is already in the first year of his work, and what will happen next, let's see. But everything is in order. TV set:

Chassis: marking (CV59SH-APW);

Panel: MT3151A05-2 (HD Resolution 1366 x 768)

T–con: MT3151A05-1-XC-7 - made in the form of a strip rigidly connected to the glass panel (not detachable)

Cpu: TSUMV59XUS-Z1; (entrance to SM - source 2-5-8-0)

SPI Flash - U10: GD25Q32BSIG;

The power supply unit and the lane are made on separate boards, but they are rigidly connected with brackets - they act as connecting current buses.

Checking the supply voltages at the output of the power supply showed that it is fully functional. The red LED is on, nothing changes when the start button is pressed. Therefore, it was decided to flash the SPI FLASH GD25Q32BSIG - the firmware is available on the web resource: https://my.housecope.com/wp-content/uploads/ext/2561/dump/lcd_pdp_tv/izumi/izumi_tle32h330b_shassi_main_ap_c36 0-34516.

After flashing, the TV turned on, tuned in the channels, checked all the voltages again on the lane of the working TV. Everything is normal, no deviations. On the lane I checked - the input from the power supply unit 12 V, 5 V StBy, 5 V SW, 3.3 V on U5 Tuner, 3.3 V on U9, at the control point Tp7 - 1.2 V, in Tp8 - 1.8 V DDR, +5 V USB, +12 V at ULF. Issued to the customer after the run. The picture quality is poor. The viewing angle in the vertical plane is small (the screen darkens already when looking at it from above at an angle of 45 degrees, and also from below), as they say, a step to the left, a step to the right, and everything is gone. The matrix has a pronounced backlight in the center of the screen.

A month passed and the TV returned for repair. For me, this case is of some technical interest. As I wrote in some forum topics, all equipment that has been repaired in the service will be monitored and its repairs will be described in the already open topics.

And so, after the first repair we had: “The picture quality is poor.The viewing angle in the vertical plane is small (the screen darkens already when looking at it from above at an angle of 45 degrees, and also from below), as they say, a step to the left, a step to the right, and everything is gone. The matrix has a pronounced backlight in the center of the screen ”

As expected, this is a defect in the LED backlight. But I have not found data on the organization of the construction of LEDs inside the matrix, their type, as well as their number inside the matrix. Again, the TV came in for repair with a diagnosis - the sound turns on, but there is no image, it reacts to the remote control. Measurement of the voltage at the output of the drivers showed the presence of a voltage of +72 Volts on each of the two channels. It became clear that the LEDs inside the matrix were out of order. The client refused to repair this TV, the TV was bought for experiments, alteration of LED backlighting, if possible. The autopsy of the matrix surprised me!

An elementary calculation shows that 72 V / 9 pcs. = 8 Volts per LED. This is a lot. This is where the very fast degradation of LEDs came about. As the former owner of the TV said, at first it gave a very bright image, and gradually, over a year and a half, it darkened. Measurement of all LEDs showed that they all burned out. I saw this for the first time. Usually, one or two set-diodes in a line fail, but here they are all at once. This speaks only of one thing, incorrect calculation of the driver for the LED backlight chain that is used in this matrix. Factory defect, one gets the impression that the TV was made in a "hurry" - from which it was assembled.

For the alteration, rulers with three volt LEDs were taken.

The corresponding calculation shows that 72 V / 3 V = 24 pcs. LEDs per channel, 8 LEDs in one line. Since there are two channels, there should be 48 LEDs.

After assembly, it turned out to be a good design, with a high-quality image. With a voltage at the output of the drivers of 62 volts, which corresponds to 50% brightness, we have rich colors and good brightness.

It is impossible to imagine a modern apartment or house without video and audio equipment. This equipment is used every day and therefore breaks down more often than others. There are several ways to repair TVs: send the technician to a service center, call a qualified technician at home, or make repairs with your own hands.

Before you start repairing a TV, you first need to make sure what the problem is. This will also help if you do the repair yourself, and then when the master comes, you will be able to explain the situation to him.

There are several types of malfunctions that can most often be found when a TV breaks down.

1. The technique does not turn off. In independence, a CRT TV or a modern LCD model has broken down, this malfunction is associated with a blown fuse. Only different models have distinctive details from each other. You should also pay attention to the diode bridge - perhaps it was he who burned out.
2. In both domestic and imported models, the potential can often go astray, for the function of which the posistor is responsible.
3. If the plasma TV monitor is broken, then the problem, most often, is interference or drops, light or dark stripes may appear, color changes while watching a program or movie.
4. The problem may be a broken cord or a faulty outlet.

If we take into account all the troubles listed above, it is worth saying that the most difficult breakdown is considered to be a screen malfunction. For example, light reflections appear on your monitor after the liquid hits the matrix or the TV is hit, then it is better to carry it to the teleservice. Here it will certainly be repaired, and if the warranty period has not expired, then it will be free of charge or at a reduced price.

See also - How to choose a TV for your home in 2018?

You can try to fix some malfunctions of TVs yourself. And it doesn't matter here - these are LCD models, LCD or LED, it is not necessary to call the wizard if you are confident in your abilities. But caution never hurts, because such TV models are not cheap, and without having any repair experience or knowledge in this area, you can only harm and aggravate the breakdown.

Before you start repairing LED or LCD TVs, you must carefully read the instructions, and also study the principle of operation of your model. Anyone, even one far from this field, will understand that the repair of TVs such as LCD or LED will differ from CRT models. In the latter case, you are guaranteed not to run into a faulty PTC thermistor. The main thing here is to determine the problem, why does the backlight not work?

If you are repairing LCD, LED models, then the only difference here will be what kind of backlight is used. If it is an LCD TV, then the backlighting is produced using fluorescent or fluorescent lamps. For TVs, LED backlighting is produced using LEDs. At this point, the differences between LCD models usually end.