DIY TV mystery repair

Mystery TVs appeared on the Russian market relatively recently, already in the era of the development of LCD television technologies. Very few CRT models (televisions with a picture tube) were released, they have not been supplied to repair services for a long time, therefore, there is no need to consider them within the framework of this article.
The history of the creation of the Mystery brand is rather vague. Many trading companies cite audio equipment manufacturer Mystery Electronics, which was allegedly founded by two American businessmen in China.
In reality, Mystery TVs are produced in Russian assembly workshops in Kaliningrad and the region from cheap components and modules of Chinese origin, like all similar low-price counterparts such as SUPRA, Techno, Fusion, Rolsen, etc.

For repairmen, Mystery TVs do not create significant difficulties, and the necessary parts or blocks for replacement are purchased in the wholesale and retail sales of Russia and China.

Modern LCD and LED Mystery TVs are assembled on the basis of some Chinese standard board (Main Board) based on a multifunctional processor combined with a video controller (scaler), often from the developer Micro Star. There are many types of such boards produced in China. All of them are capable of working with HD or Full HD LCD TV panels with the appropriate software.
Some types of such Main Board for LED TVs of small diagonals (up to 24 ″) may include a backlight inverter and, in some versions, a power module.
Sometimes the power supply unit can be supplied as a separate device in the form of an adapter and is issued when sold together with the TV.

A popular malfunction among this category of TVs is software glitch. This is usually due to the use of poor quality memory chips from the manufacturer Winbond.

External manifestations of a failure in the Software:
The indicator on the front panel of the TV shines constantly (more often it signals the standby mode), does not respond to the remote control and function control buttons, there are no other signs of operability.
Replacement of software and memory microcircuit is required.
Such external manifestations can be caused by other malfunctions, for example, related to the power supply of microcircuits on the Main Board, or even a defect in the control processor.

Faults in the power circuits of a power supply or inverter usually look different outwardly, for example, no control indicators on the panel are lit, or the indicator is blinking. There may be no picture or appear only when turned on.

The most popular manifestations of power supply faults:
The TV does not turn on and the control lamps do not light up, there are no sounds or signs of switching on.
More often in such cases, the power module is faulty.
When using an external adapter, even the owner of the TV can check or replace it. In this case, it is necessary to observe the input and output parameters indicated on the sticker.
Repair of a power supply is quite complicated and requires the appropriate qualifications and knowledge of circuitry of modern flyback voltage converters from the master. Direct-flow converters are practically not used in this TV category, especially in adapters.

Display backlight malfunctions:
There is no image, the screen is black, there is sound, sometimes with reflected light, image elements in contrasting areas are poorly visible.
A faulty inverter can be a power converter for lamps or LEDs for backlighting an LCD panel (matrix).
With the same symptoms, there may be faulty LEDs or lamps inside the panel, which can only be replaced in a hospital setting. Disassembling the panel at the customer's home is strongly discouraged.

St. Petersburg, Bolshevikov Ave., 3, building 1.

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 MYSTERY MTV-3207W TV, panel type and modules used. The composition of the modules.

Inverter (backlight): T87I029.14

MainBoard: 228-100326009 V.100420 // MSTV3208-ZC01-01

IC MainBoard: h5du2562gtr-e3c

T-CON: HV320WXC-1007061 NT71180MFG

Inverter (backlight): TV3203-ZC02-02

MOSFET Inverter: Q209, Q210: APM4015P; Q211, Q212: APM4010N

Power Supply (PSU): TV3206-ZC02-01

IC MainBoard: CPU: MST6E48RHS-LF-Z1, Fash: FL032K1F, Sound: TPA3113D2, Tuner: F21WT-3BAR-E

Specifications MTV-3207W

It is recommended to start repairing the MYSTERY MTV-3207W TV with a thorough external examination and diagnostics of a malfunction. When doing this, it is advisable to carefully examine the internal and external components. Sometimes only by some signs it is possible to determine the further direction of the fault localization. In most cases, the repairman can guess about the causes of the defect and the possible consequences by the characteristic signs of typical defects in TVs, for example, the formed ring cracks in the soldering of the element terminals, swollen capacitors of the rectifier filter, charred resistors and other circuit elements.

If, when you turn on the MYSTERY MTV-3207W, there is no image, or it appears for a second and disappears altogether, but there is sound, most likely either the backlight lamps or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the common power supply.
The repair of an inverter can often be somewhat complicated by the device of special protection circuits, which are designed to turn it off in emergency situations for the purpose of fire safety when lamps are depressurized, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostics to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
In these cases, special care must be taken due to the risk of failure of the power elements. After the completion of all repair work, it is imperative to restore the protection circuits for the full and safe further operation of the TV by the user.

Motherboard repair MSTV3208-ZC01-01 it is necessary to start with diagnostics and testing of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. When repairing an MB board, you need to check its components - CPU: MST6E48RHS-LF-Z1, Fash: FL032K1F, Sound: TPA3113D2, Tuner: F21WT-3BAR-E. Defective elements must be replaced.

We remind users again! Attempts to repair the MYSTERY MTV-3207W TV without proper qualifications and experience can lead to its complete non-repairability!

The appearance of the MainBoard MSTV3208-ZC01-01 is shown in the figure below:

MSTV3208-ZC01-01 can be used in TVs:

BBK LEM2648SD (Panel V260B1-LE9 revC1), BBK LEM3248SD (Panel HV320WX2-130 (B3)), BBK LMP3229HDU Ver1 (Panel T315HW02 v.7), BBK LMP3229HDU Ver2 (T315HW04 V764), BBK LEM1 C1), MYSTERY MTV-2607W (Panel V260H1-L05), MYSTERY MTV-3206 (Panel T315XW04 V.7), MYSTERY MTV-3207W (Panel V315B3-L04 rev.c1), MYSTERY MTV-3213LW (Panel T315XW04 V.8 ), MYSTERY MTV-2220LW (Panel CLAA215FA15), MYSTERY MTV-3207W (Panel HV320WX2-110), MYSTERY MTV-2614LW (Panel V260H1-LE6), MYSTERY MTV-3208WH (Panel V315H1-L02), MY 24STER V236H1-LE5 Rev. C1), MYSTERY MTV-2618LW (Panel V260B2-LE11), MYSTERY MTV-2211LW (Panel CLAA215FA10), MYSTERY MTV-2414LW (Panel V236H1-L01), MYSTERY MTV-2660LH1 (LE V2 C1), MYSTERY MTV-3206W (Panel T315XW03 V.3), MYSTERY MTV-3211LW (Panel V315H3-LE2 Rev. C1), MYSTERY MTV-4207WH (Panel T420HW09 V.1), MYSTERY MTV-1921LD (Panel HT185WX3).

Main features of the MYSTERY MTV-3207W device:

Installed matrix (LCD panel) HV320WX2-110.
Matrix control uses the HV320WXC-1007061 Timing Controller (T-CON).
To power the backlight lamps, the TV3203-ZC02-02 inverter is used, controlled by the OB3328 PWM controller. The keys of the type Q209, Q210 are used as power elements of the inverter: APM4015P; Q211, Q212: APM4010N.
The formation of the necessary supply voltages for all nodes of the MYSTERY MTV-3207W TV is carried out by the TV3206-ZC02-01 power module, or its analogs.
MainBoard - the main board (motherboard) is an MSTV3208-ZC01-01 module using CPU chips: MST6E48RHS-LF-Z1, Fash: FL032K1F, Sound: TPA3113D2, Tuner: F21WT-3BAR-E and others.
The F21WT-3BAR-E tuner provides reception of television programs and tuning to channels.

MYSTERY MTV-3207W Version V7L03
Panel type (matrix): T315XW04 V.7
Motherboard: MSTV3208-ZC01-01, Tuner: F21WT-3BAR-E
Invertor: TV3202-ZC02-02 (A) P / N: 303C3203063, B40695, AV IN: TV3211-ZC15-01 (A) P / N: 303C3211054, AV IN: TV3211-ZC22-01 (B) P / N: 303C3211053
PSU: KB-5150 TV3206-ZC02-01 (A) P / N: 303C3206063, OB6563CP, B39849T
PSU: TV3206-ZC02-01 (A) P / N: 303C3206063 Schematic TV3206-ZC02-01,

Information about the composition of televisions on this site is accumulated from the records of repairmen and forum participants.
Be careful! Typos and errors possible!

It is impossible to imagine a modern apartment or house without video and audio equipment. This equipment is used on a daily basis 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.

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 that have more than one light source. 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 protection 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.

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 make a 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 working 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.

Model: MTV3223LW. Diagonal: 32 "(81 cm). Screen format: 16: 9. Resolution: 1366 × 768 HD Ready. Viewing angle: 170 ° / 160 °. Refresh rate 50 Hz. Speaker system: 16 W (2 × 8 W) Inputs: HDMI x2, USBx1, RCA tulip, VGA. Plays video (mkv, avi), music, photos when connecting external devices (external hard drive, usb-flash).

Full description of the repair on the website DZYUKRAS

A MYSTERY MTV-2216WD TV with a declared malfunction was received for repair - it does not turn on, it smokes, it was already sent for repair - it went on for a while, then again the same story.We turn it on to check for the claimed defect:

The LED turns green, but there is nothing on the screen. After a while, it really smelled of burning. Well, let's take it apart.

The device came in an untwisted state, so we just remove the back cover and disconnect the connectors going to the multimedia unit, and also disconnect the network cable connector:

We carefully examine the board of the power supply-inverter. We see a characteristic darkening of the PCB near the transformers:

Type of used power supply-inverter board: TV2201-ZC02-D2 (B). P / N: 303C2201066. Disconnect all other connectors from the power supply board - inverter:

Here is a closer shot:

As you can see, the inverter has already been dug up pretty much. The condition of the transformers is unknown, they may be damaged. It is not clear why, having repaired the TV in the workshop, the owner did not carry it there under warranty if he walked only a few days. In general, it was decided to completely change the inverter. The GOLD-04S2625V module was purchased:

On the other hand, he had the connector pins painted:

Removed from the power supply-inverter board:

Transformers T1 and T2, jumpers JMP3, JMP5, JMP10, resistors R18 (ON / BK) 200 kOhm and R33 (ADJ) 330 kOhm. Then the GOLD-04S2625V board is installed. It turned out like this:

Then the board was installed in place, all the connectors were screwed on and plugged in:

We connect the connectors of the multimedia unit and close the lid. We include:

Working. We check the operation of the brightness control. Functioning normally. We put on a four-hour run with periodic off-on. Everything is working.

This TV can be used as a monitor for a video surveillance system. Such a system can be built on the basis of solutions from Novicam. Novicam is a good ratio of reliability and price. You can buy novicam (recorders, cameras and even all sorts of small things) using the link above.

All photos were taken with a Kodak EasyShare C1530 camera.

Probably, many are familiar with the situation when the TV stopped showing signs of life when the owner intended to turn it on. Now we are calm about this, as we understand that you can use another TV in the next room or in the kitchen, and the faulty device can be repaired over time. But, if you look back thirty, forty years ago, the refusal of the TV to turn on would be perceived as a big nuisance. TV then, despite the ideology of the programs, for many people was the only window into the world. It was in no way possible to skip the episode “Seventeen Moments of Spring”, and the feelings about this seemed quite reasonable.

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

It is quite easy to verify the opposite. You need to check the electrical outlet where the cable from the TV is inserted. Plug in a table lamp and make sure it works. Remember where your device has the power button, and if there is one at all. This is no joke, many owners forget about its existence, using only the remote control.

The assortment of TV sets is so diverse and wide that even a master on TV in a model not very well known will take some time to find the mains switch. These elements of the scheme tend to hide in nooks and crannies, below, on the side, behind and be completely invisible. Accidentally hitting this button and not noticing it, then you can ask for a long time the question "Why does the TV not turn on?"

Of course, situations with a button or a bad outlet are not typical and are quite rare, but by checking these things it is worth starting to diagnose 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 whether to call a master or fix the TV with his own hands.

For many men who consider themselves technically literate, the issue of TV repair does not seem so difficult. “There you just need to replace the fuse, or something else, but to fix it you need a tester, a soldering iron and a circuit,” some confident people think so. However, the desire to repair the device on its own can decline after the cover is removed from the device and access to the boards and blocks of a modern TV is obtained.

The fuse, as we are used to seeing it, in the receiver, most often, is one and in most cases intact, if there were no farce-majeure 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 has blown, but most of the "fuses" are now made in an SMD case and the search for a faulty one may take a long time, since there can be dozens of these components, and they are located in any television unit. It is rather difficult to visually determine their presence in the circuit and distinguish them from similar in appearance capacitors or resistors without proper skill.

Let's say the search was successful. Here it is - a burnt out "fuse" (fuse), which needs to be replaced and the hope that the TV will again delight us with juicy stories and heartfelt stereo sound will come true. However, joy can be premature. Questions should arise: "What is the rating of the defective fuse?" and "Why did it burn out?" If you don't 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 microcircuit or hear the crackle of exploding transistors. This means that you have not found the cause of the blown fuse and, as a result, significantly increased the cost of further repairs.

For an experienced TV technician, the socket for the fuse in the power supply hastily wrapped in wire, causes sacred awe, horror in the eyes and the understanding that this device cannot be restored quickly and painlessly, that you cannot earn a lot, and you will have to “sit” with it for a long time, looking for changing what in ordinary life is not in the habit of failing. The most unpleasant thing in this case is the unpredictability and lack of logic when searching for defective parts.

Situation analysis and assessment of the factors affecting the occurrence of a malfunction are an integral part of the professional skills that an experienced TV master... Finding the root cause due to which various components of the television chassis, including fuses, can fail, is the main task of a specialist. You cannot repair, relying on "chance", without having firm confidence that the defect will not recur in the future.

A simple example. Panasonic CRT TV does not turn on. Measurements show that a 56 volt zener diode is broken in the tuner tuning voltage generation circuit, which performs a purely protective function, and its presence or absence in a properly operating chassis is not at all necessary. Due to inexperience, when repairing with your own hands, replacing this part leads to its repeated burnout. If the zener diode is not installed at all, the TV can turn on and work for a while until the line transistor, frame microcircuit or line transformer burns out. The reason for this behavior is in the overestimated voltage that the power supply gives out, and if even deeper, in the loss of the nominal capacity of two electrolytic capacitors of 47 microfarads. in the primary circuit of this block. This is the root cause of all troubles.

There is much more to be said about why the TV won't 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, one should look for the cause and eliminate the consequences caused by it. An attempt to restore the TV's performance on its own may not always end in success. You need to be ready for such a turn and think a hundred times before deciding on this step. It may be worth calling a foreman on TV for repair and, accepting a job, pay, first of all, his experience and knowledge, and not the ability to solder and use a tester and a circuit.

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Without video and audio equipment, few people can imagine a full-fledged home, and it is precisely because of regular and intensive use that this type of equipment is most often subject to breakdowns. Repair of TVs can be done at home, if you call a master, or do all the work yourself.

Before starting repair work, you should determine what exactly broke in the TV. In any case, this will greatly facilitate both the independent repair process and the explanation of the essence of the problem to the TV technician.

Photo - Samsung design

The main types of faults:

1. The device does not turn on. In both CRT models and more modern LCD TVs, a malfunction occurs due to a blown fuse. But in different devices, it can be represented by different details. At the same time, the problem may be a burnt out diode bridge; Photo - kinescope
2. The potential of imported and domestic projection TVs is very often lost. A posistor is responsible for this function;
3. Breakdown of plasma monitors. These include color changes, swings, interference, or dark (light) streaks on color TVs during broadcast;
4. However, sometimes problems with turning on or operating certain functions are due to a faulty power cord or outlet.

Of all these troubles, the most difficult to fix is ​​screen breakage.For example, if light reflections appear on the monitor after a shock or water ingress on the matrix, then it is better to immediately take the device to a service center, where it can be repaired under warranty.

Photos - details

But most of the repair work can be done easily with your own hands. Let's consider in order how to carry out urgent repair of home LCD and LED TVs Thomson (Thomson), Sharp (Sharp), Samsung, Panasonic (Panasonic) and other models:

1. The difference between the above types of TVs lies in the different backlighting, but in principle, their operating schemes are very similar. In LSD TVs, the monitor is illuminated by fluorescent lamps, and in LED - by LEDs. Therefore, if the monitor does not turn on, you immediately need to check whether the backlight is receiving power;
2. Regardless of the brand, the back panel is removed. It is screwed to the base with screws. After that, you need to remove the network power wires from the matrix (first unplug the device from the outlet); Photo - rear panel
3. To check their performance, you need to connect the most ordinary lamp to the contacts. Most often used at 100 watts;
4. It should be noted that modern Toshiba (Toshiba), Sony (Sony), Philips (Philips) can connect several backlight sources to the circuit, so you will need to check each one separately; Photo - matrix
5. For testing, the matrix is ​​removed, a lamp is connected to the contacts and the power wire is connected to the network. If it is working properly, then the lamp will light up. If not, then you will need to replace the cable or repair individual threads.

In addition, a certain area of ​​the backlight may burn out.

In different models of television equipment, the lamp is replaced in different ways. For example, for many Daewoo, Akai and Hitachi TVs, to dismantle a burned-out lamp, you will need to remove the matrix from the panel and reinstall the element on it. At the same time, for some Rolsen and Funai, it will be possible to change a lit bulb or diode without dismantling it. Depending on the design, you will need to bend (unsolder) the contacts, remove the gasket and carefully remove the burnt element from the case. In its place, a completely similar lamp is installed, both in terms of parameters and dimensions.

Photo - LCD monitor device

Many Chinese models of television equipment - CTV, VAO, BBK, during disassembly you can see light stripes on the matrix. They indicate a breakdown of this particular element. Due to some external factors, the part stopped working and oxidized. In this case, you need to select an element that is identical in terms of performance and install it in the place of the faulty one.

Unlike old stationary CRT or portable models, plasma and ED versions are very rarely subject to repair if the screen breaks. This is a very time-consuming process, so not even all professional workshops undertake such work. In most cases, if the monitor is cracked, it will be cheaper and easier to buy a new TV set than to repair the old one.

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