Bad TV. Main malfunctions of LCD TVs
Like a TV set is broken - you can practically get it right. Often the causes of breakdowns lie “on the surface”, and the repair of a TV set, with the right approach, does not represent a particular complexity. All the same, I recommend not kolupatisya independently, but I will describe the types of breakdowns and methods of repair - just so you know that you are checked during repairs and did not let the master fool yourself. Also, I present a list of the most widespread problems.
The TV does not turn on and does not flicker
If the "box" does not turn on, and the indicator does not light up, the core of the problem is more important than the life block. Often the vin burns out due to voltage fluctuations. The same reason calls for a mimic inclusion of technology. As in the model of transfers, there is an unstable voltage, in critical moments it won’t work and the technique is weak. Are you sure that there were no drops? The same reason is needed not only for blockages of life, but also in the motherboard - microcracks could appear on it.
Often the problem is blamed, they have two dzherels. The first and widest - the remote control is wrong. Dosit not far away to miss yoga, or spill it on the keys of the land, and the wine will cease to function. The reason can be even more banal - it’s just the strength of the batteries (you won’t believe it, how many times people took this factor for a “breakage”). As a whole, it’s real, that the remote control has nothing to do with it, but the cause of the problem becomes viyshov from the fret of the remote control. Yakscho and everything is in order here - the processor is guilty, more for everything.
lost memory
You are advised to save the list of installed channels, but do not leave anything. Imovirnoy cause may be an injustice, I will add a memory. There is a similar problem: you saved some settings (for example, sound), but after you turn on the saving technique again. For whatever it is, I'm guilty of straightening out the memory microcircuit. If the damage was confirmed - it is necessary to simply replace it.
"Zero reaction" to buttons
TV does not respond to pressing buttons on the control panel? Shvidshe for everything, on the right in the contact between the button and the micro controller to regulate the robot. So, in the first turn, it is necessary to check the contacts, and if everything is in order - find out the reason for the failure of the microcontroller processor.
vague sound
Most of the vipadkіv dzherel problems zі zvukannyam become inaccurate dynamics. That's why it's necessary to change the line in the first place, that the stench is correctly connected, and all contacts are in a good state. As the diagnostics showed the column stand and z'ednan, but the problem is saved - the cause of the varto shukati in the functioning of the radio channel.
There is no image, but yoga is the “cult”
Often trapleyaetsya: TV inclusions, a little sound, ale "picture" in the afternoon. There are a lot of reasons for this failure: the TV repairman in the diagnostics process should identify the correct factor that identified the problem. Before the word, practically the entire list of problems is really virishity:
- The image is silent, but the sound is the reason for the breakdown of the matrix or the video amplifier.
- The image is silent, and the sound periodically disappears - tse, better for everything, pointing to problems with the swell.
- The sound is present, the screen is glowing, but nothing more is heard - it's immovable, the video processor is out of tune. The second most banal reason is to switch to tuners.
- The image is not expanded to full screen - a "symptom" of breakdowns in the frame layout of the matrix. Breakage of the personnel layout module may be due to the instability of the voltage or to the inaccurate functioning of the living unit.
- The appearance of a viscous smug of a vertical spread on the screen may indicate a breakdown of the transformer of the string strip. Horizontal smugs point to problems directly behind the staffing.
- Having disappeared, the color or the image turned into one color - showing the breakdowns of the video amplifier or the video processor.
matrix problems
It is not cinematic, but a reference matrix, which is installed in modern TV models. The inadequacy of this element turns into a serious problem, so it is not necessary to repair the wines, and it will be necessary to carry out a replacement. In essence, the matrix is the main element of the screen, on which the image is displayed. The matrix may break down for the following reasons:
● the TV set has fallen or the screen has been hit with a blunt object;
● Motherland has spent on matrix contacts;
● insertion of an element of rejection;
● the item has been worn as a result of 3 years of use,
About the fluctuations of the matrix, to see different colors of smog on the screen, the appearance of dark colors, the freezing of the image or its appearance. Carrying out the diagnostics of the matrix and the replacement of the element is the responsibility of the additional master, since the process of transferring a lot of nuances (especially the arrival and completion of the repair).
problematic
For malfunctions of the personnel distribution in the TV set, a sprinkling of factors is indicated. Zokrema, changes or changes in the vertical image, centering damage, lines appearing, and the appearance of a personnel layout. In the rest of the moment on the screen, only one woman, horizontally spread out, shines.
The reason for all the malfunctions may be the incorrect functioning of the block of the personnel breakdown generator. The frequency of firing in the generator is regulated by the set of electronic elements. Therefore, in order to fix problems, it is necessary to get people, ideally to understand the design of models.
Know such fakhіvtsya ukrainian service Kabanchik.ua- here you can quickly hire a TV repair master with adequate prices and high qualifications. Be a maestro all-round good, but for such vipadkіv it’s better to get a professional - you’ll be smarter, cheaper, and you’ll be pleased with the result of the repair. Description of the main breakdowns of LCD televisions help you to tell the front about the malfunctions of any block, however, this information does not claim to be true in the rest of the instance - it is possible to accurately identify the faulty block only after diagnostics, made by the master.
The modern rare-crystal TV sounding is built up from the advancing blocks:
Serve for the security of other universities with different voltages, you can see a few guards, but don’t stink. Before talking about the malfunction of this module, you can see the onset of symptoms: the TV does not turn on, the indicator is off, the indicator blinks, the start of the TV starts with a delay, the TV starts blinking after a working hour, after pressing the button, the indicator lights up and immediately turns on on some televisions with speakers a little clattering), after one hour after the inclusion, the image disappears, the sound is lost (often it comes to televisions with a diagonal of up to 22 inches). It is worth the most frequent malfunctions, but problems with eating can be manifested very differently!
It takes care of changing the low (12, 24v) voltage, which comes from the block of life at the temple of the voltage, enough for the expansion and support of the light of the lamps of the light source. It can appear in different ways: once the TV is turned on, you notice that the upper part is darker than the lower one (or on the other hand) and the image immediately disappears. A truly respectful TV viewer can mark on the screen the shadows are collapsing, so it’s not the image that disappears, but the illumination of the screen. When the TV is turned on, there is a sound, and the screen is dark - also "to the right of the hands" of the inverter.
The need for this module is important to reevaluate: the unit is responsible for managing all the main nodes of the TV set, including the live unit, inverter, timing controller. here raztashovaniya central processor, Tuner, DC-DC converter, timing and constant memory software security. Main board faults: image shifting, problems with TV controls, incorrect inputs (for example, HDMI-in), problems with adjusting TVs, etc.
T-Con is engaged in the conversion of signals, which should be included in the main payment in signals that understand the matrix, which allows you to capture images on the matrix. Raznomanіtnі smuzhki, "goosebumps", damaged by colors, gray screen, white screen- you can talk about the malfunction of the timing controller. Well, the matrix is a tenacious detail. Lamaetsya in more fluctuations as a result of mechanical (impact), chemical (flooding) or other sound infusion. It is impossible to repair the matrix after the shedding of light, or mechanical failure! And yet other matrices are troubled, for example: vertical smoky, gray screen, different galvanization, splitting of ruhomih objects - in this way, the sense of turning around for the repair of the TV.
Chi is not recommended to take on the repair of the TV set independently. Repairs current TVs and may dosvіd їх repair. In a different way, it is possible to “finish off” the device, after which a good fahivet will not be able to bring it to fruition..
In this article, we can look at the main faults of RK TVs, LCD TVs or plasma TVs and їх independent repair. Also, a description of the main problems in modern models of TV sets and ways to get used to them in home minds:
1.) BBK To enter the special menu of TV sets without DVD (LT2003S, LT2008S, LT1703S), press the "MENU" button on the turned on device and, pressing the "STANDBY" button. The special menu allows you to change color settings, select language, set test mode, change settings.
To enter the special menu of TVs from DVD (LT2007S) it is necessary to press the button "SOURCE" and "OPEN" on the turned on device. It is hoped that you can adjust the color settings, select the language, set the test mode, change the settings.
It is possible to look at the software version and region, so that you can switch the TV to DVD mode, go to the menu with the "SETUP" button on the remote control and dial the combination "9210" in sequence.
2.) BBK Rejection of LCD panels after defective points.
The instruction is to be applied both to the LCD panels of portable DVD players, and to the LCD panels of televisions.
1. Checking of LCD panels should be carried out under natural daylight, which shows a value of 300-700 Lux.
2. Examine the LCD-panel visually from a distance of 30-40 cm (for panels with a diagonal of up to 20 ") and 60 cm (for panels with a diagonal of 20" and more).
3. Testing vibrations, displaying fields of red, green, blue, white and black colors sequentially on the screen.
4. Criteria for rejecting panels *
4.1. Introduce a defective LCD-panel, which has one bright pixel (all three color points of one pixel light up).
4.2. Introduce a defective LCD panel, which has more than one color dot (in the warehouse of a pixel, a dot of one of three warehouse colors is permanently lit: red, blue or green).
4.3. Introduce a defective LCD panel, which has over 6 black specks (the dot of one or more warehouse pixel colors: red, blue or green) does not shine over the entire area of the panel, for understanding, there should be pairs of dots more than one 15 mm.
4.4. Introduce a defective LCD panel, which has over 3 black dots (the dot of one or more warehouse pixel colors: red, blue or green) does not shine over the entire area of the panel, for mind you, if you want one pair of dots less than 15 mm.
Please note: LCD-panels with a diagonal of 15 inches and larger are not supplied for warranty and post-warranty repairs. LCD-panels up to 14 inches are supplied.
3.) POLAR 43LTV4005, 51LTV40005, 51LTV4010, 51LTV4110 Fault: dark blue screen light in draft mode. For the PLT module, remove the resistor pos. R314.1 / 4W 10kOhm. 
4.) POLAR 43LTV4005, 51LTV40005, 51LTV4010, 51LTV4110 with chassis type SLT-021 Fault: appearance of noise on the image when receiving programs in the range of 75 MHz to 85 MHz.
1. Clean the mask of the other conductors of the ground bus on the board on the side of the tuner installation (close to the #3 tuner).
2. Put a jumper with solder, so you can get the other conductors of the ground bus
9.) Super 14 "LCD TV + DVD. Incorrectness: from the client's words, the screen went out for an hour, the sound went out when I switched it off. As a result of the report review, it was noticed that the screen was not working in the apparatus. short hum i, zgidno from those. documentation of the picker, it is guilty but connected to the main divider - the upper arm 220K to + 12V, the lower arm is regulated 50k to the ground. A 0.47 μm capacitor is parallel to the lower connection arm. Actually, only a capacitor was installed, other elements were daily. The applicability of the apparatus was confirmed after the given part of the scheme is clearly up to PDF. A possible simpler option is to connect a 1k resistor in parallel with the capacitor. I myself have grown up like this, the apparatus has been working for the third day.
10.) Super 8 "LCD with a faulty adapter (12v, 1.2a). Fault: working 10-15 mins. And so on. 0.9A, what information is provided on the label.
11.) LG RT-15LA50 Incorrectness: sound є, raster glow, no image. The problem is in the poor soldering of the IC501 processor. This defect is a pathology in both TVs and in the modules MDFS-01, MDFS-03 from Toshiba.
12.) Elenberg DVD-28 released in China. Incorrectness: from the words of the Lord, I got off normally, but on the next day I didn’t turn on. Revamped as a cigarette smoker, roztin showed that he was a ChIP-zapobіzhnik. There is a rose of life, there is a sprat, all white color is 0 on board. Now about the reasons - on the right, the bula was on the 20th of the fierce, the frosts were normal, naimovirnish, the car froze overnight after warming up, turning into a generator for condensate, and how to write in the instructions for coristuvachiv ... when transporting in cold weather before turning on, vitrimat virib u a warm welcome is not less than 3 years old. end of quotation.
13.) Hyundai H-LCD2001 Fault: slightly unacceptable whistling sound. On the screen you can see the shifts at the sight of smog moving. Recheck and, if necessary, replace C917470.0x16. Installed on board 5800-A8T832-02. Typical defect.
14.) In the rest of the hour, the Chinese LCD TV, the great diagonal, and the sky were brought in for repair. Incorrect: when switched on, the panel lights up for a second and the power supply unit switches to the draft mode. Get out of the way of the living block. The selection is greedy. The throttling at the second lancius is also very hot. In case of overheating, the core of the choke is irrevocably losing its power. Vimiruvav opir by streak(Vimirnik ESR). Result: overheated choke 12 volt winding = 2 mu. normal choke = 20 ohm. It is necessary to rewind the throttle with Russian ferrite of the same size penetration - 1000, and put a fan in the computer.
15.) LG KZ-17LZ21. Incorrectness: from the client's words, stopped reading disks, then the matrix went out, the sound is normal. I turn it on, the light for the draft mode lights up (red color). On startup, lights up green colors and far away silence. The matrix does not light up, the sound is present. In case of expansion, the inverter is overturned. Vіn zіbrany on microcircuit BD9766FV (switch-controller) and two arms of vihіdnіh retvoryuvachіv on pole transistors RSS090N03-N-channel і RSS075P03-P-channel. 2 transistors and 3 pulse transformers to power 3 upper lamps and another arm with two transistors and three transformers to power 3 lower lamps. Poloviks voted to live 3 upper lamps of the matrix.
Tas well as zgorіv smd zapobіzhnik 4A to 24V on the inverter board. For the cob, turn on the upper scheme of the conversion and launch the TV. The matrix lit up and an image appeared. Ale, after 3 seconds everything went out, ale TV went into working mode. Spratsyuvav zahist in BD9766FV. So the lower shoulder is correct. I don’t know the schemes anywhere. Robiv by analogy with similar schemes. I don't know original transistors. Pіdіbrav go for the parameters. Zamіst RSS090N03 putting in maternity pay computer HUF76129S. And replace RSS075P03 by setting IRF7416. So just replace the electrolyte in the block of life (partial loss of capacity) C823: 220uF at 25V. Varto yakraz in the filter for eating the inverter +15..
When turned on, the TV is normally turned on. It was noted that the IRF7416 transistor heats up three times stronger than the HUF76129S. Their hulls are different. IRF7416 sot8 is small, and HUF76129S is big, that one can be even richer. About every change on the IRF7416 hung a plate part of the middle radiator. But it’s less likely that the upper arm heats up more strongly than the lower one, or through a larger stream of lamps, or the original transistors are adjusted according to some parameters. And in general, the temperature here is 60-70 degrees. The DVD programmer had to clean the laser head. Ale, the laser is still pidsiv. Deyakі disks do not read. And regulate the strum without becoming a shob not to drive yoga to the end. That client was not especially overwhelmed. Obviously, the ideal option is to replace your head, ale, as if nothing. That th name I don’t know on niy.
Elements are not built to ideally block the flow of light - the black color on the LCD TV screen is really not absolutely black.
It is also necessary to take into account the shortcomings and the loss of contrast, the shards of the LCD are not so wide. Because of this peculiarity of LCD TVs, they could not gain popularity for a long time, but at once, zavdyaki zusilly retailers, creations became practically unremembered.
Prior to the transfer of televisions with a rіdkokristalіchnym screen, you can see a wide range of models with different indicators of brightness (vіd 250 to 1500 cd / m2) and contrast ratio (vіd 500: 1 to 5,000,000: 1). Zavdyaki tsomu, the buyer can bring the device, optimally fit in your own necessary image quality and available price. In addition, LCD TVs are driven by a small gang and comrades, so they can be placed on the wall.
And the greatest merit of rare-crystal technology is in its mass character. For a large-scale variation, the prices for televisions with an LCD matrix are lower at the same time, lower for other similar extensions.
16.) PREMIERA RTR-750ZX Fault: no sound from the tuner, but no sound from the LF input. On weak channels, you can use the color or do it wrong. You may see images. Repair of the inverter path. Replacing FEPki SAW2-D3953M - putting LG - X6966M.
17.) PREMIERA RTR-750ZX Fault: does not turn on in dredge mode. All voltages are normal. Repair of processor lances. Replacement of quartz Y1 - 12 MHz.
18.) Rolsen RL-20X30 Fault: the power supply unit does not trim voltage, although at idle the output voltage is 12 volts. С08 47.0x25 having spent the capacity.
19.) Teckton TL-32VWTS Fault: TB turned on after bug-like manipulations of the vimikach. Glancing around, showing: PSU to switch to operating mode (ind. Merezhі does not light up), 5, 12 and 24 voltages without pulsation, sensory. Claudia react - TV is blocked in the DR. A further analysis with an oscillom gave a positive result - increased pulsation on C96 100x16v (the cost of a stabilizer
1.8c). After replacing the panel, it started working.
The reason for the defect is the burnout of a thin plate next to the bottom of the capacitor C1 (100.0x25) between the positive contact and the diode D1. +12 to the stabilizer +5 to the control circuit. It is possible to visually identify the defect through a separate placement of parts. Figure 2 shows the shaving of the other with the capacitor C1 removed.
Instead of burning a friend, it is better to solder a 7-mm jumper from the gate side of the plate between two transitional openings. We replaced the skips of the electric C1 and the burnt diode D1, after which the TV set was normally charged.