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23.02.2015
Don’t alway have to replace the LCD inverter when you have a mulfunction LCD inverter. An LCD TV has the same circuits as in a conventional TV, but otherwise has circuits that are new, such as the inverter and the whole display (lamps, and matrix liquid crystal display). The breakdown section that most often is the inverter and power supply, as these elements are those that handle higher voltages and are therefore more circuits get hot. The inverter is responsible for making calls CCFL lamps illuminate or serve cold cathode lighting or backlight, and can control the screen brightness through these. The main components in an inverter are the integrated circuit oscillator, which generates a signal or oscillation activated after a power circuit consists of MOS transistors, FETS and transformers, this last set of components eventually excite the lamps.
The inverter main power comes from the power supply, which is present at power-up TV, or at least most work this way, the voltage value depends on the size of the LCD TV which will be between 12 and 24 volts DC. When we try to repair an inverter should be noted that for this to work properly, you must meet certain conditions that are related to the control signals between the microprocessor and its own inverter. This handles the brightness signal usually comes as DIMMER silkscreen, and she determined that lighting level should give the lamps to improve the black level. LCD TVs tend to have a gray level before a neutral black, so the DIMMER should be well regulated.
We must bear in mind that if this line is not active, the inverter will not work even if you get the right diet. The line of protection in the inverter can be identified as ERROR, INV_ERROR, errror INV_DISABLE or OUT.
To a lesser extent the oscillator circuit failure (often cross over to mass excitation output MOSFET), and almost always breaks down is that the MOSFET circuit that also causes damage to the oscillator.
Sometimes the failure of the inverter are usually filtering problems of food caused by electrolytic capacitors at the source. Measuring a MOSFET is difficult because there are plenty of them, essentially be measured not in short the drain and source terminals, which typically measure some ohms, but when they are encapsulated as an integrated circuit must resort to the road datasheet for information or technical parameters of these. I find by experience is better I measure with an oscilloscope that has the components measurement function (such as HAMEG oscilloscopes). To check the transformer it is easiest to measure its resistance with a tester but can lead to error. If we believe that the damage is being caused by the integrated oscillator must analyze all voltages (VCC, OUT, etc.
If damaged CCFL lamps only thing possible is replaced by the correct type and form as the original. If we have problems with inverter control lines to do various tests to find out where the problem.
A control line can go ashore without even having any problem with the inverter, which will cause the inverter not turn on the lights. Then if all went well solder the resistor in series with the standby voltage power supply and control line.
If after many attempts to repair, do not get the desired result, it is best to search the market an inverter that has the same number of outputs of lamps that we want to repair and adjust the pins of one and the other to make the substitution . Perhaps my age is what influence to me chances to try new things and that my physical faculties (sight, hearing and touch) have to 100% as always helps in this profession which, unfortunately, always just burning (perhaps I exaggerate) the view by forcing it to small tracks, welding, or micro-components that exist in the market today. This module is used to generate a high voltage AC (alternating current) in the form of frequency starting from a low voltage DC (direct current), so what does not cease to be practically more than a converter from DC to AC, switched by a voltage. This type of inverters is for small screens, whether they are portable DVD for laptops or LCD's very small.
This inverter has two input connectors (although it does not have to always be well and there are some that only carry 1), one is the power and the ground and the other also, but more a more takes the start switching and the relevant signals to operate. With this more or less left a little redial the variants of inverters that there are in the market, now we are going to what is essential and common in the power inputs of the inverters. Another possible failure and one of the most typical are the 1000uf capacitors that are positioned to filter the 12 or 24V in some cases i find that you put the same value, and the backlight device was trying to start and was not able or just starting up and last a good while it turned off the backlight and at the same time I noticed that the filter of 1000uf warmed up, these cases i have solved by adding one of 2200uf. It should also be borne in mind that these 12 or 24V on the inverter goes to a fuse, and do not reach the mosfets. As we said before, the inverters modules take an alternating current of between 1KV to even up to 3.2KV i have come to see, as always varying depending on the inches and lamps of the television. The advantage that we have to verify these transformers is that there are always more equal transformers with which to compare. For the cases in which we were not locating the transformer or unspilling or simply out excessively expensive later I will comment to them on a solution in the paragraph of the IC Driver of unspilling. DRIVER these CI CI serve to give a train of impulses to the base of the Mosfet transistors for switching of transformers and generate high. TL494: As we can be seen in the graph, its serious power (VCC) pin 12, its serious mass 7 (GND), the 3 would be the BL ON, the Dimmer do not remember well but I think that was the 13 (Output control) and the Soft-Start is the 4 (Deadtime control). Note: Before commenting that the leg of the Soft-Start is very interesting, because here I've taken many repairs LCD.
When this IC feeds, directly a tension out Soft-Star leg that goes to a capacitor (the other end of the capacitor will usually mass) doing a mass crossing and continuing giving a voltage from a 3V to 5V. In the case that was cut a lamp, to change it would have to remove all the display and is an option to consider, since if you have no experience and careful, we run the risk of breaking the display a bit and then if it would be a device to throw away. First of all is to switch on the unit and see if it tries to shine a little screen, in some cases makes the attempt and some nothing at all.
On the other hand it could be that the micro did not give the BL ON signal, if it were the case, it would have to look at the micro worked well, that you were rocking and you to generate signals of clock and data and not only that but something very interesting to keep in mind is that there is communication from the flash (TV software) to the microand if there isn't, it would be normal that there is no BL ON.
This power supply through an oscillator circuit is converted to an AC voltage much higher and will depend on the type of lamp to be exciting, it also depends on the size in inches of the TV for a much larger voltage lamps and higher.
These signals have various functions such as calibration and protection, calibration adjustment are related to the brightness of the lamps.
Might also have the right and power in the high state BL_ON the inverter does not work for entering into protected status.
They also often fail the MOS-FETS that may be independent or be encapsulated in groups within an integrated circuit (an example FDS8958).
To solve this problem, or opens fully to display visual access to them or you must have a CCFL lamp tester, we can do with an old inverter that has an exit at least for a lamp. With this feature you see the characteristic curves of transistor, as if excited by simply touching a finger in the door of the transistor. This method is working best if we adapt well and we're putting a new inverter with which guarantee the repair for quite some time.
I'm a Spanish guy, more unusual, son of technical and forcibly compelled to learn with few or many tools that I have been able to purchase and thanks to the knowledge taught by my father or guild mates. These annotations to groso way, is a bit of what I can do after several months of fix faults in these gadgets (LCD) that ultimately bring us many headaches. This high voltage is used to feed the rear lamps of a LCD display, and to generate light that can be seen the image, that is why they call you Backlight (rear light). First I'll explain that are based on your entries and secondarily as ruled out in advance if the problem is of inverter or backlight, or if the problem comes from chassis or power supply. On the one hand we need your input for power supply of 220V AC and on the other hand we have the other connector that will give us the signals relevant to the inverter and starting to turn, will be used to feed the main board (chassis) .The supply voltage you will be given by a rectifier diode accordingly filtered transformer that will come from the switched of the source. This type of inverters is powered normally 24V and need far more amperage than any of the others mentioned.
Have an entry each one, in the Master has power and control signals, and switching and the slave you reach only the supply and the earth. Sometimes it is cut by poor quality and others are cut by some Fet in cross cut or transformer.


This tension tends to be between 2, 5v to 5V STBY and its power-on State always is at 0V.This tension comes from the microprocessor that is what gives the order, but eye! For example, in the displays CHI- MEI, when this low-level would be switched the digital dimmer and against her when this high would be working the analog dimmer. Some inverters carry this joyful leg and is responsible for informing the microprocessor of any fault suffered in the inverter. Another interesting thing and of big utility it is the power to verify a module with feeding and commutation externally. These high voltages the we got thanks to the transformers transistors switched MOS-FETS and even sometimes (depending on the inverter) by a few coils (inverter type Buck Royal). The first thing of everything, it is necessary to know which is its 1st winding and which the 2nd one to what it refers of patillaje, since often they come to you with many sideburns which are only of adornment. In case of replacing a transformer with one of scrapping it is necessary to be careful, since the transformers little by little are faltering and more if they already take a use for the warming that they suffer. In some cases like this are formed by 2 Mosfets and others in just 1, could also be the P-type or n-type For these Mosfet if that would recommend lowering datasheet before making any test, since they can vary their pinout. Any that again I found fault in module inverters in which everything appeared to be fine, but changing some Mosfet switching of transformers of the inverters finished working properly the appliance.
The vast majority of inverters I've seen do not carry it, but a topology is take into account.
They normally do not fail, of echo I think that I just found a case in that IC was crossed and there was no backlight.
The PIN 9 and 10 would be the outputs of the trains of impulses for the base of the Mosfets and the 1, 2.15, and 16 are lamps reference entries, longer that these integrated have them to get one or several references and if they will detect that it is not suitable they autoprotegerian and is apagaria the Backlight. The OZ, has both analog dimmer as digital, but only one of them will be that Act, depending on the type of circuit of the main board. For example, when you have a LCD failing him the inverter and we can not repair it because it damaged a transformer or when there is a cut off lamp, there are few solutions that we can make it to repair, usually tend to buy the module for new, but sometimes or the inverter is too expensive or simply no longer in the market because this discontinued.
Then I would do a verification of consumption and if it were correct it would continue maintaining the tension, on the other hand if it detects a wrong use, would make crossing the capacitor to ground and would be 0V, cutting the departures of trains of pulses.
The first thing we should do to an IC that we know is get off the datasheet and search Deadtime or leg Soft-Start control. The only way to know if they're wrong is with oscilloscope and always and when the end that won't-powered lamps independent of the others and we could watch the turn making, if the input is good and the output is bad, this lamp is defective. You can also opt for the cancellation of the protection of the inverter and we could leave the inverter operating with all lights except that this evil. If you do try, means that initially the food arrives (12 or 24V) and that their boot and Dimmer polarizations in the beginning are correct. The first thing you would do in this case is to verify lamps with HR checker, since it is fast and should not focus on the circuitry, if any lamp is bad, either the exchange rate by resistance d 33 K or 56 k (depending on the size of the display) or will void you protection and would look if you notice it or notSince in some cases don't usually hardly appreciate and thus should not be handling the display and remove it completely.
We speak in these cases of rapid tests of continuity with the hand Tester since we can more or less rule out areas of the inverter if lose big time.
When powered up it will take a couple of seconds then a rapid clicking noise can be heard from the back left side, when standing behind the TV. Here we have a circuit like the high voltage output of a conventional TV where we had a line transformer that gave us the order of 20KV to turn the picture tube.
Important not to be measured with the tester or multimeter on these outputs to lamps that can spoil.
The security lines are activated for various reasons, such as a lamp ceases to operate, one or more MOS-FETs have been made are short or open circuit, a transformer is also shorted or open although it may happen that the very line of defense is going to land because of a faulty port on the inverter or the microprocessor. I am 27 years old and many will think that perhaps he is too young to have experience, but I've been since age 15 workshop trying to improve day to day repairs and researching to bring affordable solutions.
We start off with the modules, inverters, as do checks and take deductions of the problem that we have in the corresponding device and later finish for solution giving you, that us is economic for us and the client. As every electrical circuit is made up of several components, including highlighting some that another IC (Integrated Circuit) as for example the Driver, several transformers depending on as many bulbs as I have the display and several transistors type MOS-FET, is encapsulated with SMD transistor or IC MDS. Normally its power is about 12" or- .At the same time, the lamp shall be placed at the top or bottom of the display, passing the light through a transparent plastic (kind of Metra quilato) , which leads the light by its entire interior. On the other hand has 8 connectors and one separate appearing in this picture not it would go in the bottom corner to the left that it would be "common", so it is for a 16 lamps. These inverters are normally fed of 24" and with enough amperage as in the previous case, about 4 or 6 amps or- .Each one has 1 output for the bulbs, each feeding a side of ends of the bulbs, or, for example the master feeding the left side and the slave to the right or even, by putting all the lamps in series and one of the loose ends that is giving you the power the master and the other end the slave. Other cases with the same source as the source vacuum i have the 24V but the plug to the inverter i came down and was also by the MKP and others simply nor be able to boot to the inverter giving 0V.
In cases where the LCD has an external source, usually also fail the 1000 uf capacitors or replace the feeder. The DIMMERS they say it s for the brightness of lamps, but in practice we cannot give more or less brightness in the image from this leg. Normally looking with an oscilloscope in this leg we observe how varies its amplitude to the beat of the image ,so to speak in some way it is as if you had an automatic control of the brightness of the bulbs, adjusting it always to the image you are seeing at that time.
In some cases will not connected and in others, such as for example in sharp if that necessarily by design is connected. Knowing every paw so that it serves, what I usually do is to put the corresponding feeding bearing in mind the inches of the display (12 or 24V and with a minimum of 6 amperes), him(her,you) puenteo the paws of the commutation of ignition of unspilling (BL ON) with those of the control of Dimmer and I inject him 3V with another source and this way unspilling has to start(pull out). Also comment on some inverters that had at one end of the bulbs a common, normally this is going to mass, therefore to 0V and serves to create a potential difference between one end of the bulb and the common. Also it is necessary to bear in mind that there are some transformers that have 2nd two 1st and two, but that you will realize that it is evident for the tracks if they him(her,you) come to many paws or only to someone. I met the problems of replacing a transformer with another scrapping igualito and to a little time to come to me again with the same cut transformer, this is due to the fact that the IC Driver has a mental block and on having tried to start(pull out) extracts an excessive peak in the exit(departure) for the Mos-Fet, therefore in the amplification it will be evident moreover, the solution would be to annul the protection of unspilling so that the IC Driver has not a mental block. These failures are usually find much in few lamps inverters, above all on monitors with a supply module integrated inverter.
Among other things, should bear in mind its power, BL ON, everything to do with Dimmer and something very interesting, Soft-Start PIN. This reference may vary by a cut lamp or a transformer cut or altered or anything in the area of high-voltage module inverter. EYE!We are talking about in the case that the Soft-Star did it in ON a high level, also could do so at low level, will not be neither the first nor the last inverter you would find me to work at low level. Another option that we would have is to add to the connector an at least 5W ceramic resistor, so we enganariamos to the inverter, telling him that he has the correct lamp, therefore when it comes to check consumption does not detect error and would keep on. However make sure first of all, it could be that the power was low or source was not able to boot to the inverter due to lack of power. Once ruled out the entry of the inverter and lamps, practically all the inverters (common fault) always make an attempt to illuminate and cut.Before this fault I what I normally do is to verify the transformers. You can see the display very faintly on the front and access the menu options but the clicking causes the display to flicker rapidly as well.
In the present case we have a high voltage circuit with a corresponding high transformer for each lamp, but with less stress.
I am of those who think that change a module always is left to the end, when already your repair, but that the otherwise by impossible never learn and not only that, but which as I have said before, sometimes spending that can lead us to the repair of a plate, can let us rather more benefit than the change of new. For inputs and outputs have their corresponding connectors seeing clearly what is input (cable that goes to the power supply or the chassis) and which are outputs (wires toward the bulbs). This type of inverters is for larger screens, typically up to about 23 ", has only a connector input and multiple output, in this case 4 output with a total of 12 legs, reaching the conclusion that it is for a 6 lamps.
On the other hand we have 4 outputs for 4 lamps, which Iran located 2 at the top and 2 on the bottom. This "common" can be a simple cable that goes to mass and all the lamps ends to make a potential difference in each lamp, or even on some models, especially in Samsung, they have 2 connectors for cable type FLEX, which is where all the ends of the lamps by independent thread.


The connector for cable type FLEX, is only of interconnection between the 2 modules, it's not the same as the previous case to the ends of the bulbs. If you decide to repair, at times I have had some that another problem with external power supplies, especially with the LI-chin, is that still fail even having filters are changed by being in bad conditions, the solution is resoldered all welds of the source, including those of the SMD components and with this work correctly. Normally this line do not tend to have problems, I found only one case carrying a Vestel 17PW15-8 source that he polled the backlight when I wanted to and it was because of BL ON. This pata in its correct state there are 0V,but at the time that determines that there is a fault, is generally made high level.
If it works we will see the resplendence on the screen and if it gives some problem of that cuts or that simply does not do the resplendence, unspilling is damaged by some place and we will continue with more tests.
When the ends of the bulbs are independent with a cable type FLEX at the top and bottom of the inverter module, if we punctured with the oscilloscope, we see that there is a return of the senoidal impulses that come out of every one of the bulbs.
When we know which are its windings it is necessary to compare them with the others, measuring with the polimetro in all the rest transformers, both in its 1st one and in its 2nd one. When they are of the type as the FDS, normally only comes in the nomenclature the number, for example, in this case (FDS8958) only comes inscribed the 8958 and my way of knowing which is, is putting me in Alldatasheet, write the numbering and this database is prepared so that you locate the components that integrate into its "8958" nomenclaturelater down we'll see a big list where all related appear us.
The most basic decisions is crossing to cut the passage of 12 or 24V fuse, since normally or van direct to the transistor or van direct to the transformer and for crossing as it is the first thing that would happen.
Normally these integrated are family OZ but over time we will be observing that there are many types. This reform is based depending on the inches of display, if less than 26 "is put a 33 K resistor - and if it is more than 26" add a few 56 k or-.If it doesn't work you go putting more and less ohms to locate a keep the inverter in ON.
It could also be because the BL ON cut is either that the inverter gave a return to the micro for its leg of Error (in the case that had it) either because the micro detect external problems and cut. If there is any evil and their position is not that of most top or very bottom of the inverter, remove the top or the bottom and I put it in the wrong position and bad if it is to only leave a lamp without (at the top or bottom), unlike if it were for two lamps would have to verify if any of the other windings are this good and bad I leave it unconnected and always the here or at the top or at the bottom so that it always stays as much without illuminate those parts, since it would be less where you realize at first glance. If all this correctly, what I would do is verify the entries and exits of the Driver IC.Mainly food and secondarily the Soft - Start status, if various high level or level low depending on whether is in STBY or ON and if all is well I directly go to transformers (1 to 3 and peak KV) outputs, or directly on the connectors on lights so you know exactly which line is the wrong.
Is this a inverter or power supply problem?Mike's SAS Tutorials: I'm no expert in this area so take my advice as such. I am a technician who can not give you incredible theory lessons for my lack of knowledge of theories, laws or protocols. These lamps Irian located 3 on the top and 3 on the bottom of the display with the clear plastic or in some cases are positioned in parallel with the display, or behind the display. This type of display is used from 26 "to 37" or something as well, I can not assure that workshop has not yet entered any more than 32-inch LCD but if I have to say that if I don't I remember told me that they usually take 2 modules like this inverters and doing the same function but saving space. This type of inverters used in displays LG-Philips and only time I have seen it in 26" do not know if you have been in more inches.
Another thing to keep in mind is that the inverter can supply amorrar or because the inverter is in poor condition (crossing or semicruce) or because the source of the sufficient power, in this case would have to put consumption in the line of 24V and with the inverter unplugged to discard what is the problem. In Sharp what makes is that after giving the error, the appliance does not start unless we ourselves in service mode (cancels the protection) and delete the error. If we were detecting an enormous change in the ohms of one of the transformers to comparative of the others, this transformer would be altered and it can obtain that the module to unspill between in protection cutting the Backlight. This is because they play with a balance so that the image reflecte better, they illuminate more the top and low(lower) part because it is where more darkness index can have and this way they manage to balance it. Another case that I happened to any which again is that if a substitute Mosfet riding the original and we are not sure if they are the same characteristics (P or N), if you put the contrary usually or always leave the on screen or acts against, or when it needs to be on is off and must be turned off is on. When the bobbin thread has a considerable thickness, they normally fail welds since it would be impossible for you to remove. Under tests 95% of the cases has gone me perfectly, but there are some who brought me a few headaches. Lamps are bought by length and diameter of the same, if everything is the same one to another, in theory it could replace, but if we knew the tension at which they operate and the Khz which works as serious one point in our favor. But what I'm sure is that I will try to make some explanations simple, easy to understand for everyone, that technical engineer as to who has a device and is a handyman and you would like to make a repair without complications or questions.
Its power also is about 12V, in this case with more amperage than the previous one, because you need more power in order to be able to boot to the transformers.
This happens because it is registered in the memory of the device and when pulled up and starts the tv software, tells the micro that do not start by error in inverter. But these transformers if we notice have the same references therefore if we extract them out of the module and measure we will see that they all mark equally, but the culprit is the circuit that is designed this way. When I began to investigate the solutions that could reach have a module inverter based on measurements, me di account this leg changing state when it was the Backlight on and off.
As all tension, working to a home and that various time between ones and other tensions that we can locate the device. It should take into account that the inverters if they detect something wrong on this plate, short entering protection, so tests must go by them by turning off and turning on the appliance whenever it enters protection. When I emailed asking them when I could expect a replacement, they sent me the tracking number (that I had to return the TV) and said I received the TV and needed to call the police to file a report. We will always speak of common failures of these modules, as no backlighting and therefore the lack of image but with existing sound. However in other brands simply in giving the order to error, short signal directly ON BL, but when we started up again, if the inverter has not suffered a damage ,turn back on the backlight without need to go into service mode as in Sharp. Another thing to be born in mind is that, on having measured with the polimetro in the windings of the transformers, if there was some damaged transformer, few solution would have since these transformers do not sell for free, unless we had of scrapping. It should first check the connection of the inverter (power & control) if everything is correct could be that the inverter fuse was cut by poor quality or by crossing.If the problem is external that did not come you the power would have to check the power supply, above all the source 2nd which generates the 24V and the order which gives the microphone to jump-start to this part of the source of power (STBY).
Some typical bugs are welds of transformers, some again electrolytic capacitors the inverter or even some Mosfet internally not working well although making measurement appear to be fine. The test method I found to determine if it's an inverter board problem was to shine a flashlight through your screen from behind and if you could see some of the menu trying to be displayed, then the backlight isn't working and thus it's an inverter board issue. This pata can be overridden, in sharp still didn't try but in a display LG Philips if and did not affect the functioning of the LCD. In the case of which was cut even I have not tried winding them again, but it is something that as soon as I have time and some module affected with cut coil, I'll try and I will comment.
In the case of the MosFet, serious change by trying, since some cases I've gone crazy looking for a measurable failure and at the end has been one of them failing.
When in doubt of the lack of backlight I usually LIGHTLY press the display with your thumb, getting that the liquid display let out a little more than light. These coils are as original replacement, except to be a conventional coil, in that case we could locate something. If no meeting that glow, check inverter, but if this, unless we ruled out the possibility and will continue through other ways other than this.
However there are others that put the leg to ground and is as simple as bypass the leg of the Soft-Start capacitor, its other end is mass. Only question is do you recall or have the part 2 for the inverters?i»?Mike's SAS Tutorials: Sorry, that was spam. It's a little tight and it might hurt your fingers, but you should just be able to pull it out gently.



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