In detail: do-it-yourself mystery TV repair from a real master for the site my.housecope.com.
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.
Video (click to play).
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 (SW): 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 the 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.
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:
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 no secret that a breakdown of a television receiver can ruin the mood of any owner. The question arises, where to look for a good master, do you need to take the device to a service center? You need to spend your time on this, and what is important - money. But, before calling the master, if you have basic knowledge of electrical engineering and know how to hold a screwdriver and a soldering iron in your hands, then repairing the TV with your own hands in some cases is still possible.
Modern LCD TVs have become more compact and easier to repair. Of course, there are breakdowns that are difficult to detect without special diagnostic equipment. But most often there are malfunctions that can be detected even visually, for example, swollen capacitors... With such a breakdown, it is enough to evaporate them and replace them with new ones with the same parameters.
All TV sets are the same in their structure and consist of a power supply unit (PSU), a motherboard and an LCD backlight module (lamps are used) or LED (LEDs are used). It is not worth repairing the motherboard on your own, but the power supply unit and screen backlight lamps are quite possible.
As already mentioned, the design and principle of operation of LED and LCD TVs, regardless of the manufacturer, are the same. Of course, there are some differences, but they do not play a significant role in the diagnosis of faults. Often, in the event of a problem with the power supply, the LCD TV does not turn on at all, while there is no indication, or it turns on for a while and turns off spontaneously. Using an example, the repair of a DAEWOO LCD power supply unit (can be applied to plasma) is considered, which is not much different from repairing an LG TV, as well as Toshiba, Sonya, Rubin, Horizon and similar models.
First of all, before you repair the TV, you need to remove the back panel of the device with a screwdriver by unscrewing the screws. On some models, the rear wall may be latches installedwhich must be handled with care so as not to break them.
After removing the cover, you will see the power supply unit, consisting of several modules on the left, and the motherboard on the right.
On the power supply board you can see 3 transformers: the bottom one is the mains rectifier choke, the top one on the left (large) feeds the inverter, and on the right is the standby power supply transformer. You need to start checking with it, since it turns on the standby mode of the TV receiver.
Duty transformer when the device is connected to the network, it should give out a voltage of 5 V. In order to correctly find the wire on which you need to measure the voltage, you can use the diagram, or you can see the markings on the case. In this case, opposite the required contact is written - 5 V.
Measurement is taken first open circuitby connecting one probe to the found contact, and the other to the cathode of the diode on the radiator. In this case, there is no break.
Further, one tester probe can be attached to the body of the device, the other to the previously selected contact, and measure the voltage, having previously connected the telly to the network. In this case, the device shows 1.5 V, instead of the required 5 V. Such readings of the transformer indicate that it is working, but not at full strength. The reason may be dry condenserlocated below, or swollen - above the transformer.
To remove the parts that have become unusable, it is necessary to remove the power supply board. To do this, first disconnect all wires and the matrix cable coming from the inverter and the system board.So that in the future, after repairing the power supply, you do not get confused where what is connected, you can take a picture of them before disconnecting the wires and loops.
Now you can remove the entire LCD TV power supply by unscrewing the 4 screws. After removing it, it is very important discharge all capacitorsto avoid electric shock.
We solder the defective capacitors and replace them with new ones, observing the polarity.
The assembly of the device takes place in the reverse order: the board is screwed into place, all connectors and cables are connected, the rear panel of the unit is closed.
We again measure the voltage on the transformer of the TV's power supply (the device should turn on) and see that it has become 5v. When you unfold the repaired TV receiver, you will see that it works.
As you can see from the review presented above, repairing TV power supplies with your own hands is not such an overwhelming task. Following this description, you can also repair plasma TVs.
Do-it-yourself TV repair with a kinescope, for example, such as: Rubin, Horizon, Sharp 2002sc, LG TVs, as well as repair of the Vityaz TV, begins with checking the power supply unit for operability (this is done if the unit does not turn on). It is checked using incandescent bulbs for 220 V and a power of 60-100 W. But before that, be sure to disconnect the load, namely the horizontal output stage (SR) - connect a lamp instead. The CP voltage ranges from 110 to 150 V, depending on the size of the tube. Must be found in the secondary circuit SR filter capacitor (its values can be from 47 to 220 microfarads and 160 - 200 V), which stands behind the SR power rectifier.
To simulate the load, you need to connect a lamp in parallel to it. To remove the load, for example, in the popular Sharp 2002sc model, it is necessary to find and unsolder the inductor (located after the capacitor), the fuse and the limiting resistance through which the CP stage receives power.
Now you need to connect the power supply to the power supply unit, and measure the voltage under load. The voltage should be between 110 and 130 V if the CRT has a diagonal of 21 to 25 inches (as in the 2002sc model). With a diagonal of 25-29 inches - 130-150 V, respectively. If the values are too high, then it will be necessary to check the feedback circuit and the power supply circuit (primary).
It should be noted that electrolytes dry out during prolonged operation and lose capacity, which, in turn, affects the stability of the module and contributes to an increase in voltage.
When the voltage is too low it is necessary to test the secondary circuits to exclude leaks and short circuits. After that, the diodes for the protection of the power supply of the SR and the diodes for the power supply of the vertical scan are checked. If you are convinced that the power supply unit is working properly, then you need to disconnect the lamp and solder all the parts back. This check can also come in handy when doing DIY Philips TV repairs.
Another common breakdown of the TV that can be eliminated is the burnout of the backlight lamp. In this case, the TV receiver, after switching on, flashes the indicator several times and does not turn on... This means that after self-diagnosis, the device notices a malfunction, after which the protection is triggered. That is why there is no image on the screen.
For example, a Sharp LSD TV receiver with this malfunction was taken, although in this way it is possible to repair Samsung TVs, Sony Trinitron, Rubin, Horizon, etc.
To fix the TV, you need to remove the back cover from the TV. This requires a screwdriver or screwdriver.
Next, you need to be careful disconnect loops from the matrix.
The next step is to detach the control panel from the case. You do not need to remove it, you will still need it to turn on the device.
The remaining loops also need to be disconnected. Then it is necessary to remove the housing on which the electronic boards are fixed.
Before removing the matrix, unscrew front frame... We remove the matrix itself and filters, snap off the side mounts.
We connect the power and hold down a few keys to enter service menu... This will keep the lamps on for a while.
The figure below shows that after turning on the lamps, the 5th from the top turned out to be inoperative. Disconnect it and replace it with a new one - now all the lamps are on when checking.
The assembly takes place in the reverse order.
After that, you need to turn on the TV receiver and enter the service menu for reset lamp error counter... If this is not done, the device will not work. Entering the menu, you need to find the corresponding line and reset by selecting ok. Now the repair of the LCD TV set is finished. Tests show that the unit is operating normally.
Thus, you can repair the Philips and LG TV with your own hands, and other LCD panels, as well as devices with LED backlight (LED). Owners of the latter type of devices should read the article on repairing LED backlighting, where the whole process is described in detail using the example of an LG TV.
Among the typical and simple reasons that the TV set does not turn on, there may be a remote control or a lack of signal from the antenna cable.
If the TV does not turn on with the remote control, first, you need to make sure the batteries are good. If they are shrunken, replace them. Often the TV set cannot turn on due to contamination of contacts under the buttons. To do this, you can disassemble it yourself, and clean the contacts with a soft cloth from accumulated dirt. If your remote control has been dropped, it is possible damage to the quartz emitter... In this case, it must be replaced. Well, if you filled the remote control with water or some other liquid, and it did not work after disassembling and drying, then it will have to be replaced with a new one.
You can learn more about fixing the remote control in the following video or article.
When repairing TVs LG, Sharp with LCD, Rubin, Horizon with the same screens, a situation often arises when it does not turn on when the device is in good working order. It turns out that the reason may be no TV signal in the antenna cable. This happens due to the operation of the noise suppression protection (in Rubin TVs, they began to install it not so long ago), and the unit goes into standby mode. Therefore, if you find your TV set inoperative, you should not panic, but you need to check the presence of a signal from the transmitting station.
In conclusion, we can say that when you decide to repair a TV set yourself, you should soberly assess your abilities and knowledge in this matter. If you do not feel confident, then it is better to entrust this matter to a telemaster, especially since nobody canceled 220 V, and ignorance of basic safety rules can entail unpleasant consequences.
It is 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.
The technique does not turn off. In independence, a CRT TV or a modern LCD model has broken down, this malfunction is associated with a blown fuse. Only different models have distinctive details from each other. You should also pay attention to the diode bridge - perhaps it was he who burned out.
In both domestic and imported models, the potential can often go astray, for the function of which the posistor is responsible.
If the plasma TV monitor is broken, then the problem, most often, is interference or drops, light or dark stripes may appear, color changes while watching a program or movie.
The problem may be a broken cord or a faulty outlet.
If we take into account all the troubles listed above, it is worth saying that the most difficult breakdown is considered to be a screen malfunction.For example, light reflections appear on your monitor after the liquid hits the matrix or the TV is hit, then it is better to carry it to the teleservice. Here it will certainly be repaired, and if the warranty period has not expired, then it will be free of charge or at a reduced price.
See also - How to choose a TV for your home in 2018?
You can try to fix some malfunctions of TVs yourself. And it doesn't matter here - these are LCD models, LCD or LED, it is not necessary to call the wizard if you are confident in your abilities. But caution never hurts, because such TV models are not cheap, and without having any repair experience or knowledge in this area, you can only harm and aggravate the breakdown.
Before you start repairing LED or LCD TVs, you must carefully read the instructions, and also study the principle of operation of your model. Anyone, even one far from this field, will understand that the repair of TVs such as LCD or LED will differ from CRT models. In the latter case, you are guaranteed not to run into a faulty PTC thermistor. The main thing here is to determine the problem, why does the backlight not work?
If you are repairing LCD, LED models, then the only difference here will be what kind of backlight is used. If it is an LCD TV, then the backlighting is produced using fluorescent or fluorescent lamps. For TVs, LED backlighting is produced using LEDs. At this point, the differences between LCD models usually end.
