Why does the monitor not turn on when turned on? The computer turns on but the monitor does not work
Your computer starts working when you turn it on, but monitor doesn't turn on and stays dark? The problem is quite common, and in order to solve it, it is necessary to conduct a thorough diagnosis of the PC and determine the reason for this “behavior” of the monitor. There are a number of ways to do this, thanks to which you will find out why the monitor does not work when you start the computer.
If the power supply turns on and then turns off within a few seconds of pressing the power button on the case, everything is fine. After removal, load all capacitors. In some cases, it may also be a dead battery, so it is recommended to replace it with a specific charge.
Also try to change the slots, there may be some bad motherboard slots. Here's a movie showing what to do. If the power remains on, there is a problem with the processor. Then make sure everything is installed correctly.
Monitor does not turn on: contacts and power
First of all, make sure that the problem is not with the monitor itself. To do this, turn off the computer by pressing the “Power” button and holding it for a few seconds. When the system unit stops making noise, turn it on again. Is your monitor still not working? Then that's not the reason.
Now check the power to see if it is getting to the monitor. If disabled network filter, no image will be displayed on the screen. Perhaps the button was accidentally disabled. The monitor's power button, depending on the model of the latter, may be located on the side, or on the front panel, or on the back. If you see the light bulb is glowing and the monitor does not light up, press the button and watch the other indicators on the monitor to see if they light up, power is being supplied.
However, there may be incompatibilities. Insufficient power supply. A power problem that cuts out after a few seconds can also be caused by poor power output. If the power supply cannot supply power to all components, it suddenly turns off.
Or it could also mean a power failure. Then you will need to replace it with more powerful model. When you turn on your computer, motherboard runs quick tests to ensure all components are running. However, there may be situations where the motherboard emits short or long sound signals or sequentially. Each type of sound signal is associated with a typology of the problem.
Otherwise, determine what condition the contacts are in. They may well be damaged, and the damage is usually located at the following points:
1) connection to the system board;
2) connecting the motherboard to the video card;
3) connection to the monitor itself.
If you suspect that one of the listed contacts is damaged, check the cable that connects the computer to the monitor. Also make sure that the graphics card is securely and correctly connected to the motherboard card, as the problem may lie in the type of signal that is being transmitted. Modern PCs mostly have video cards with two built-in connectors - DVI white and VGA blue. In addition to them, there is also a third type of connector - HDMI, which is used on the newest models of computer monitors.
Searching online or consulting your motherboard manual will help you figure out exactly what is causing the beep. Each code is associated with a different problem. Sometimes the solution is simple, the problem may be caused by a distraction or something you missed.
In other cases you should test by evaluating the component component by component until it finds Hardware, causing the problem. First, rule out display as the source of the problem. To make sure it's not a display issue, press the power button on your computer.
If the computer is connected to a blue connector, try connecting it to a white connector or vice versa. If the monitor is working properly, when you turn it off you will see the message “No signal”. In addition, on motherboards with built-in graphics adapter there is a connector for connection computer monitor. And if the monitor’s operation is restored when it is connected, then the problem, most likely, is that the video card settings have gone wrong or it has simply burned out. You can also press the “Menu” key on the monitor and see what the reaction is. If a window appears on the screen, the monitor is fine and you should adjust the contrast and brightness settings.
If one of the above conditions is met, use an external display. Check if the outlet works, connect a lamp or other electrical device. Before connecting the multimedia projector, turn off the laptop. Connect the power cord to the projector and also to an electrical outlet.
Using a multimedia projector with a laptop
To turn on the multimedia projector. This turns on the projector lamp. This key is different for different laptop models. This translates the laptop display to a multimedia projector. Repeat the key combination again if you do not see the image on your laptop.
Monitor and system board failure
If you find that your monitor is taking too long to turn on, it means there is something wrong with the capacitors. When the monitor is not working well or monitor not working problem may consist of a partial or complete malfunction of the system card. In addition, difficulties may be associated with damage to the connector for connecting the motherboard to the video adapter. But to check this, you will need to connect another graphics adapter.
Check the power cable
If these steps have not yet sent a signal to the projector, press the "input" button of the multimedia projector or use the remote control remote control for this purpose. To turn off the multimedia projector. The symptoms are as follows: The laptop will most likely turn on after the second, third, fourth press of the shutter button. It doesn't matter whether it's battery powered or mains powered. After release it works once without problems.
If this happens to you, don't despair! The solution is very simple - with a little patience and a lot of desire, even children can cope with this problem. You must work slowly and carefully. One way is to enable a button. But the variety of laptops and the buttons used for them are very different. And the replacement itself, due to surface mount technology, is a test of skills. Sharp tweezers, needles or slits are needed. The problem is in almost all cases: very fine powder collects in the button you see in the picture.
Remember: if you determine that the motherboard is faulty or the monitor is burned out, do not try to solve the problem yourself, but immediately contact professional help. Amateur users who do not understand computer technology should not “dig” into either the monitor or the motherboard. Of course, theoretically, you can attempt to disassemble a “bad” monitor. But, as practice shows, monitors are repaired very rarely by ordinary PC users - almost never. This is a very complex and delicate process that requires special knowledge. And, as the same practice again shows, if the monitor burned out, it is advisable to simply go to the store and buy a new one.
You probably haven't been paying attention special attention cleaning the machine. Once this fine powder has accumulated enough, it prevents the plate from making contact with the button terminals and tells the processor that it is "time to go." When it is pressed several times, the plate may touch the leads and make contact.
Incompatible video card driver
Remove the laptop covers until you reach the button. To be absolutely sure that this is the cause, you can do the following. If he presses, he changes his resistance, starts working straight; or rip something off its pins and make sure the electronics work well. First, carefully disassemble the button of its components as much as possible. This step is completely dependent on everything. Remove the plate and clean it carefully with water. You do not need to use any special medications.
Dust in the system unit
By the way, how long has it been since you “cleaned” the system unit of your PC? The system cleaner is a real vacuum cleaner that sucks in a lot of dust from environment. Therefore, it needs to be cleaned regularly so that the contacts do not become clogged, as this may well lead to malfunction of the monitor. Remove the cover of the system unit and clean it inside, just be careful with the motherboard and other parts. After “cleaning”, disconnect the video card from the motherboard, take a soft pencil eraser and clean the contacts with it. Press lightly so as not to damage anything.
Monitor is not turned on
You clean your bed in the same way at the base where you should see the pin contact contacts. Reassemble the button. In many cases, when the top metal plate is removed, the four horns of the plastic base are broken. In such cases, you can safely use the sharp tip of a small soldering iron to melt the plastic to secure the top plate. In case it is important that the glue does not get into the base of the button, because it will stick and your work is pointless.
You've seen it, it's not difficult at all! To do this, you need to connect the plug connector to two ports at the same time. Everything that has been said so far affects the performance of the monitor. When switching to a laptop, the results were variable - one job, another, not a third - sometimes working, sometimes not. In any case, you must keep in mind that in order to ensure proper operation you need to connect to 2 ports.
Other reasons
If monitor does not turn on reason maybe in wrong choice devices in BIOS. This happens when a personal computer has two video adapters - external and built-in. All you need to do to solve this problem is reset the BIOS settings to standard. To do this, simply disconnect the batteries from the system board.
Let's take a look at back panel. Another feature - complete absence buttons for adjusting the image on the body. Instead, you have access to very limited settings, consisting almost simply of being able to rotate the screen and how to add it - as a mirror or as an extension to the left, right, top or bottom. But there is something to be desired - the lightest can be seen when working with the monitor in a bright room and then in a darkened one. Of course, the brightness or the entire picture is noticeably better in the dark, which signals a lack of brightness.
The monitor's contrast is at a level comparable to that of a conventional display. To my eyes the colors look natural and pleasing. To my great delight, the panel is matte rather than glossy, eliminating the annoying shine that is inevitably visible on most modern low-cost monitors with glossy panels. Important certification that helps me swallow the lack of brightness. No matter where you stand, you will see a clear and crisp picture with little loss of brightness. Regarding the vertical angle, the situation is different: the loss of brightness is severe and the monitor becomes unusable at a large angle.
It is also quite possible that when the monitor does not light up when you start the computer, the cord contacts are to blame. Gently wipe both ends with alcohol, being careful not to bend or break the parts. Take a close look at the "pins" - if they are bent, take a small screwdriver and straighten them.
Be that as it may, do not be discouraged, because any problem can be solved.
Problems with settings
This, combined with the fact that the stand is not height adjustable, is definitely a minus for the model. Games that require high frame rates and low response times experience ghosting and motion blur. Artifacts are often visible in fast-moving scenes, especially in dark areas. My experience created an obvious interface speed limit. However, if you don't want perfectionism, the monitor will watch videos with appropriate arrangements. The time has come to define the purpose of such monitors - this is mobile solutions for displaying, for example, presentations with big screen or simple dual-monitor system configurations.
In cases where the computer turns on, but the monitor does not work, a thorough diagnosis should be performed in order to find out the cause of the problem. There are several ways to find out why the monitor does not turn on when you start the computer.
Place - turns off spontaneously
That is, a similar solution is aimed at a completely separate niche and does not compare it with a standard monitor. Last but not least, such a monitor is an extremely suitable tool for burned-out laptops or a faulty video amplifier. Take it not only as a monitor, but as an accessory, which is not bad. Case performance can be more High Quality. In addition, however, the monitor is light and thin, remember that it has a 22-inch diagonal size, which hardly feels like a mobile solution.
Checking power and contacts
First you need to make sure that the problem is with the monitor. First of all, you need to completely turn off the computer, to do this you need to press and hold the “Power” button. When the system unit stops making noise, turn it on again. If the monitor does not work, then the reason is different.
It is important to make sure that the monitor's power is working. If the surge protector is disabled, the monitor will not display an image. It is possible that the button was turned off accidentally. The monitor's power button may be located on the front, side, or back, depending on the model.
On the contrary, the weight is unique for this size - about 5 kg! A business presentation will look much better in a dual-monitor setup with a 22-inch monitor than on your laptop screen. From the point of view of our sad reality, the monitor fits perfectly into laptops with broken screen or video card. A strong disadvantage for me is the need for the driver.
The fact is that their reduction in consumption somehow negatively affects quality. My monitor was kindly submitted for testing. First check if there is a display error. Make sure you press the computer's power button. If any of these points apply and you have an external display.
If the monitor does not turn on, but the light is blinking, you can try pressing this button. Using the indicators on the monitor, you can determine whether something has changed - if they light up, it means the power has been restored.
In addition, the problem may be faulty contacts. They may be damaged in the following places:
Make sure that electric outlet works - connect a lamp or other electrical equipment. If the socket works and your computer won't turn on, try a different power cord or adapter. If possible, reinstall the original memory or disk into your computer to see if the problem is resolved. It can also be changed in the control panel.
Video: fixing a problem when the monitor does not turn off
System keyboard. If you don't use the keyboard, you can disable it. Warning about system overheating - if you set this option, the system will report when the sound is overheating. Third boot device. A third device that will try to boot the system if the first and second devices are down.
- Connection with motherboard
- Connecting the motherboard to the video card
- Monitor connection
If the monitor on the computer does not turn on and there is a suspicion that one of these contacts is damaged, you need to check the cord connecting the monitor and the computer - it is connected correctly and is in good condition. You should also make sure that the connection of the graphics card to the mother card is correct and secure.
Virtualization technology. If you are not using another computer's emulation card, turn it off. If the system crashes frequently, let me disable it. If your desktop or laptop won't start, it can be very serious. More often than not, however, we are dealing with a problem that we can solve ourselves.
My computer won't start: check the power supply. This is one of the most common problems. There are a lot of things that can go wrong, from connecting that power supply to a blown fuse. First, make sure the battery is fully charged. If you are not sure, remove it and use the network Charger. Also check that the charger is suitable for your laptop. Many laptops - especially those from the same manufacturer - use the same plug, so if you have multiple computers, you may have a power supply that delivers the wrong power.
The problem may be the type of signal being transmitted. Modern computers usually use video cards that have two built-in connectors - white DVI and blue VGA. In addition to them, there is a third type of connector - HDMI, used on latest models monitors.
If the computer is connected to the blue connector, you can try connecting it to the white one and vice versa. If the monitor is working properly, when you turn it off, the message “No Signal” should appear. Also on motherboards with built-in
Detailed description of the problem:
FLATRON monitor does not turn on
I can't wake up the computer. The longer the computer runs, the longer it takes to wake up from sleep mode, and only the blue light is on or blinking. The computer gradually, day by day, began to increase the time it took to load the desktop (it did not turn on for a long time, did not display the desktop picture, shortcuts) and the time it took to exit energy saving mode (hibernation) and, computer shutdown time (turned off for a long time). The monitor could start working 12 minutes after turning it on, or it could not boot up or work after 30 - 40 minutes, depending on how long it was in operating mode before I turned it off and then turned it on again... If I was holding the computer turned on for a day, then it (after disconnecting and resting) turned on earlier than when it worked without a break for 1.5 days or 2 days, or more. Therefore, it was possible to turn it on: wait for the monitor to turn on and, without waiting for it to turn on, turn it off, and do this 2-3 times in a row. As a result, I didn’t wait to turn it on; the monitor remained black all the time. It didn’t glow at all, even in short flashes, and only one blue indicator light was on or blinking. But on another day, after 3 attempts to turn on and turn off the computer, you might finally get lucky and the monitor would wake up, the desktop would appear, and the computer would work perfectly..., it worked like that for all the hours - until it turned off, and it worked for 10 hours and 20 hours and 48 hours... – uninterruptedly. Then, the next day (after switching on again) everything started again (in a cycle). Question: Why does the time for waking up from sleep mode and (or) from completely resting the computer gradually increase, and the time to turn off the computer lengthens (I couldn’t turn off right away, I had to wait)? Every day (for two months) the computer took longer and longer to boot and turned off longer and longer, but depending on the duration of the previous period of work, how long I did not turn off the computer... What is this violation connected with? The monitor was in good working order and all the components of the unit were good, because after a long awakening everything functioned perfectly, but the time of waking up and loading the desktop only lengthened. Therefore, nothing was clear what was happening... Computer parts cannot alternately be faulty, and then work, and then break down and then work, as if nothing had happened, and - again - on their own, for no reason at all. out of order, work and then remain idle. This means: The Beast acts remotely on the contacts, because the Beast usually always sends waves to chips (including airplane black boxes) and to contacts when it wants to disrupt the operation of electrical equipment. Therefore, some users MISTAKENLY think that they use the computer too much (without turning it off), which causes it to break down. The Beast may or may not harm... it all depends on the rules of the Beast... and (in this case) on the picture of the logo... Because all the sabotage (secretly) orchestrated by the Beast begins with a picture - a smiley, which (in the prototype) is like this , is displayed on the monitor as the letter “G”. There, next to the “LG” logo, there is also a “smiley” formed by these two letters. At first, after the computer was running for a long time, turning it off and resting, as soon as I pressed the start button again to turn on the computer, the monitor turned on after 2-3 minutes - I had to wait so long. Then (another time) after 5 minutes the monitor turned on, and so - every day more and more time passed until the pictures appeared on the monitor. t of the unit is normal, the unit did not overheat, and the monitor is working properly, but the feeling was created that the system was slowing down, as if it was freezing at the moment of loading the desktop, waking up; there is a long “freeze” of waking up and a long “freeze” of turning on the monitor, and not a freeze of the working (awakened) system or computer program. What really happened? Here's what: Two monitor plateau capacitors failed due to overvoltage, power surges in the network. The capacitors gradually burn out (failure), turn after turn... and therefore: the monitor gradually becomes covered, and may or may not turn on. These capacitors have 4 silver petals at the top, and these petals are swollen - barely noticeable, on one of the capacitors it is almost impossible to see the swelling, they look quite even (flat) because they have just begun to deteriorate. For the Beast, there are Signs in the capacitors: the number 4 and “flower” (petals). But what does the “smiley” have to do with it? Here's the thing: the monitor started to malfunction after I looked (with a special glance) at the image of a smiley - downloaded from the Internet. The beast does not like My gaze, and it begins to harm. The Beast from time to time sends waves into the computer and freezes - very often (by the way, it is also the Beast - “other” and the computer, sometimes, suddenly turns off or reboots), and now, it has begun to harm the monitor specifically. The Beast, acting on the capacitors with waves, stops their operation, because the Beast creates increased pressure (voltage) electric current. And also - in the monitor power connector... there are contacts and they need to be updated: that is: with a soldering iron, heat the solder to a liquid state - melt it and immediately let the molten solder harden, without changing the contacts themselves, without touching them. When a relative did everything like this for Me, at My request, the monitor started working again. It turned on at lightning speed without any problems, the yellow indicator light came on again, and everything loaded as it should and started working. And before this, the indicator was always on, only blue, or the blue light was constantly blinking. At first, a relative recommended that I take the monitor to a service center, and then he concluded: “The monitor is dead (the service won’t help)!”, and we also started looking for advertisements on the Internet for the sale of used monitors. After everything, in the end, it turned out that damaged capacitors and contacts of the power socket (connector) were to blame. Currently, when I write all this to you, the computer is working perfectly, the monitor has been successfully repaired!
For a significant number of people, life is simply impossible without a computer. Therefore, it is very unpleasant when there are problems with your favorite device. For example, some users are faced with the fact that the computer does not see the monitor. This can happen both with a standard device and when connecting an additional device.
There are a great many reasons for this problem. Sometimes users simply forget to connect the monitor. However, most often the problem turns out to be more global. As a rule, when the computer does not see the monitor and there is no signal, the reason may lie in the hardware of the device. For example, it is a damaged cable, insufficient quantity random access memory, error in the video card or even the motherboard itself. A little less frequently, problems are related to the operation of the system itself. Let's try to figure out why the computer does not see the monitor and how to solve this problem.
Power check
First of all, it’s worth starting with the simplest. No matter how absurd it may seem, sometimes everything is too obvious and it doesn’t occur to anyone. Therefore, if the computer does not see the monitor, then you need to check whether the cable has come loose and whether the device’s power button is pressed. This should be indicated by a special light indicator.
If the monitor is working properly (according to at least, it is definitely connected) and there is no image on it, then you should try pressing the menu button, which opens the screen settings control panel.
Checking the computer's operation
If the failure is related to incorrect work PC, then this is quite easy to check. If the computer does not see the monitor via a VGA cable, then just try connecting the screen to another device. Today almost everything modern televisions equipped with the same connector. However, if it is impossible to check the operation of the monitor in this way, then it is worth paying attention to some nuances.
If the computer is malfunctioning, it may begin to flash. If any problems occur, the power button or any other indicator on the PC begins to flash red. In addition, the computer may produce characteristic sound signals. All these signs indicate that the problem is not with the monitor, but with the PC itself.
If the computer does not see the monitor and at the same time “beeps”, then this indicates possible problems with a video card or motherboard. In this case, you should contact a service center or try to find out on your own where the failures are occurring.
Sometimes the monitor is connected normally, and the PC turns on normally without any problems, but there is no image on the screen. The device may simply be in sleep mode. In this case, you can try pressing any buttons on the keyboard or moving the mouse. If the computer does not see the monitor, then do not despair, there are still many options for fixing the problem.
Checking cables
If the wires are damaged, this may also affect the operation of the device. In this case, it does not matter at all whether the computer does not see the monitor via HDMI, DVI or VGA. Any of these wires can come loose at the most unexpected moment. Most often this happens when the cable is not screwed into the back of the screen and PC, but is simply inserted.
If you are using a dedicated video card, you need to make sure that the screen is connected to it and not to the regular motherboard connector. As a rule, the system automatically turns off the standard graphics and uses the connected device. If this does not happen, then you need to disable the image feed through the “mother” manually.
Problems with the motherboard
Many people use two monitors on their PCs. If the computer does not see the second monitor, then the problem may be that one of them is powered by the motherboard, and the second by the video card.
In this case, using a different type of cable or setting it up will help additional screen another method. Most likely, the picture will be worse in this case.
Permission
Quite often, such problems occur when the picture quality does not match the capabilities of the monitor. In this case, the screen will not work or will begin to turn off with enviable frequency. To allow similar problem, just reboot the system and start it in safe mode. After that, just change the resolution to a lower one.
However, everything is not so simple. The fact is that modern operating systems return the original resolution after 15 seconds. Therefore, you need to click the “Save” button in time. In addition, the system may begin to persistently switch resolution when it detects more suitable parameters, in its opinion.
Another situation may also occur. For example, when the monitor does not show “signs of life” when the computer is running. In this case, perhaps the user simply connected two monitors and then disconnected one of them, but operating system for some reason I did not receive this signal. In this case, it is recommended to hold down the Fn button on the keyboard (usually it is located to the left of the spacebar) and press F1, F12 or another key (depending on the laptop model).
Go to BIOS
Sometimes users encounter literally mystical behavior of devices. For example, when when you turn on the PC, information appears on the monitor about the start of the system boot, but after that the image disappears and nothing else happens. In this case, the problem may be deeper, perhaps it's all about Windows. What to do if the computer does not see the monitor in this case?
To do this, you need to boot the system in safe mode and restore the OS using the built-in system recovery function. It is also possible to implement manual reset factory settings. However, to do this you need to have sufficient knowledge and skills.
Checking the equipment
To fix the problem, you can try disconnecting the keyboard, mouse, external hard disks, printer, scanner, speakers and all other devices. Sometimes, due to problems with third-party equipment, problems can occur in the most unexpected components.
After this, you only need to turn on the monitor and computer and wait for it to load. If this does not help, then you need to inspect all the connectors on the devices. Very often, users pull out cables too quickly, causing the ports to stop functioning normally.
If they are damaged, you can try to solve the problem yourself or take the devices to a service center. As a rule, the ports in the connectors are bent, this can be seen with the naked eye. Therefore, you can try to level them with your own hands.
CPU
Sometimes all components of the system work properly, and there are no problems with the monitor itself. This situation confuses any user. It's not surprising if the PC makes a distinctive sound and the monitor works great with other devices. In this case, the problem may be with the processor. If it fails, the computer will make a characteristic sound, but in fact the system will not boot. This is because the coolers are spinning, but nothing else is happening. At the same time, even the motherboard can produce a number of characteristic sounds. However, nothing can work with a burned out processor.
Video card
This board can also fail, thereby causing the problem described in the article. In this case, the PC will also make characteristic sounds, but it will be impossible to display an image.
To check your video card, you just need to connect it to any working system unit and try to start it. If the computer does not work with another monitor, then it’s all about this board.
Some problems can be identified using computer self-diagnosis tools. To do this, you also need to insert the video card into the system unit and run BIOS testing. If during the test the PC begins to make uncharacteristic and very sharp sounds, then the problem is with the board.
However, before you test the video card on another device, you need to check whether it is suitable for it. To do this, it is necessary to clarify not only system requirements, but also whether the connectors on the board correspond to the ports on the “mother”. To do this, you should consult with specialists or ask for advice on a specialized forum.
If all else fails, then all that remains is to contact the service center and carry out full diagnostics. It won't be cheap.
It is also not recommended to try to repair the computer yourself if the user does not have the appropriate skills and knowledge. In this case, you can cause even more damage to the car. Repairs will cost even more in the long run.
Today I will talk about what to do if The computer turns on but the monitor does not work. Actually, a couple of days ago, looking at the night, I thought: “What a wonderful monitor I have, it’s almost six years old, and it’s never broken.” In the morning the monitor did not turn on 🙁
Those. Even the power indicator on the monitor did not light up. Naturally, the first thing I did was check the power cable by connecting the monitor through a different cable. Alas, this did not produce results - the monitor showed no signs of power. Taking a screwdriver in my hands, I unscrewed a couple of screws on back cover monitor, and, just in case, reconnected it to the power supply... The monitor worked! However, it refused to turn on again the next morning.
In principle, two versions have emerged that the monitor turns on every other time:
- Poor contact inside the monitor;
- There is a problem with the electrolytic capacitors of the monitor's power supply.
Actually, I had to disassemble the monitor, namely the LG Flatron L1917S (don’t pay too much attention to the brand and model of the monitor, because similar malfunctions occur with different monitors). Having unscrewed the five screws on the back cover, I carefully began to “unfasten” the case latches. I found a recommendation on the Internet that it is convenient to use a plastic card for this so as not to damage the monitor case. Since I didn’t dare use my Sberbank card, I used a screwdriver.
Actually, inside modern LCD monitors, there are not so many spill boards, so finding a rogue with a power supply is not particularly difficult, because it contains a connector for connecting the power cable.
It took a couple of seconds to identify the cause of the malfunction; it was clearly visible that one of the electrolytic capacitors (1000 uF x 16 V) of the monitor’s power supply was swollen.
The slightest swelling of the electrolytic capacitor, as a rule, leads to the fact that its capacity decreases sharply, which leads to increased ripple of the rectified voltage. So modern computer technology is very sensitive to deviations in the power supply, it simply does not turn on. In this way, protection is activated, which prevents more serious damage.
Conclusion: any swollen electrolytic capacitor must be replaced, be it a monitor power supply, or, for example, a computer motherboard.
When replacing capacitors, it is necessary to install a capacitor whose capacitance and voltage are no less than those of the original one. You don’t have to pay much attention to the manufacturer. I found a suitable capacitor in faulty unit power supply from system unit. In the photo below is a “native” capacitor from SAMXON, on top is a capacitor from HEC. The capacitance and voltage of both capacitors are the same.
Below is the “native” capacitor. The capacitance and voltage of both capacitors are the same
Well, actually, after resoldering the capacitor, all that remains is to assemble the monitor. It is desirable that after assembly there are no “extra” screws left :)
Evgeny Mukhutdinov
In most cases, the reason that the monitor does not turn on or there are problems with the image is the incorrect operation of the video card, incorrect settings, or an incorrect connection.
The simplest check:
- Disconnect all wires from the monitor
- Connect only the power cable
- The monitor should turn on. “No Signal” appears on the screen
After some time, the monitor switches to energy saving mode - “Stand by” (the power indicator changes color, the picture disappears)
In this case, the monitor is most likely working properly. Of course, there are possible exceptions.
You can also check the health of the monitor by connecting it to another computer.
If the monitor has proven to be inoperable, you should contact the service for diagnostics and repair. Our article will tell you what to pay attention to when describing the problem, so that when telephone conversation You were correctly advised on the price and timing of repairs.
Before calling the repair shop, find out the exact model name of your monitor. A number of models have standard faults that have long been known to service center employees.
The monitor does not turn on, the power indicator does not light up
If the monitor shows no signs of life, there is likely a power problem. Most often, this breakdown is easily fixed.
There may be a problem with the monitor's power cable or connectors. In this case, if you change the position of the power cord, the indicator may light up briefly when contact is made. If it is completely inoperable, the power supply will most likely need to be repaired.
Power indicator blinks, no picture
Flashing of the voltage indicator (cyclic power on and off) regardless of the position of the cord is a signal of incorrect operation of the power supply or main board.
The service center will determine the cause of the problem and fix it.
Power indicator is on - no image, backlight is on
Most likely the problem is with the processor board (MB) of the monitor. For diagnostics, you will have to contact a service center, since such “symptoms” do not allow you to immediately determine the cause of the malfunction. The technician will be able to give an exact answer only after examining the monitor in disassembled form.
The monitor backlight does not light up or goes out after a few minutes of operation
Sometimes the picture can be seen in reflected light, when looking at the monitor from above, from the side. The monitor responds to buttons and there is access to the menu. It is possible that immediately after turning on the monitor works, and after a few minutes the backlight turns off. The problem is in the inverter or in the backlight lamps: they burn out over time or can suddenly fail as a result mechanical influences(for example, a blow). Repair consists of replacing the lamps or converter. For this procedure, you should choose a service meticulously: the procedure is complex, requiring a certain level of qualifications and increased accuracy from the specialist.
Screen brightness decreases and a reddish tint appears
These symptoms indicate burnout of the backlight lamps, as in the previous case. Decreased brightness and a reddish tint may occur only in a specific area of the screen or throughout the entire monitor. The problem is solved by replacing the lamps, and various dark screensavers and monitor sleep mode settings serve as preventative measures. The fewer nights the monitor sits with a static picture on, the longer the lamps will last.
Stripes on the screen
The appearance of vertical or horizontal stripes on the monitor screen there is a sign of a malfunction of the decoder loops. If the stripes change location, then the problem may be in the video card, and if the stripes have a constant location and color (black, white, color), then the problem is in the monitor matrix. For replacing the master's cables in service centers are practically not undertaken, since there is no confidence in the success of the operation and that the problems will not return in a short time. The only solution to the problem is to replace the matrix assembly. If your monitor is under warranty, contact service immediately after the stripes appear, even if there is only one stripe and it doesn’t bother you.
If stripes appear on the monitor, guarantee period whose service life has already ended, find out at the service center the cost and estimated repair time for your model. An original matrix is required, and the cost can be comparable to buying a new monitor.
Image or color distortion
Usually occurs due to loss of contact in the signal cable or broken connectors. Check the signal cable(VGA,DVI) by replacement.
The DVI (digital) cable can only be switched (!!!) on a de-energized monitor!!!
If the defect persists, this is most often due to either incorrect operation of the video card or a breakdown of the monitor’s processor board. In some cases it can be fixed by flashing the firmware.
The technician will be able to name the exact cause of the malfunction and the cost of repair only after diagnosis.
The monitor does not display an image from the computer, it displays messages
If, instead of the usual picture, the monitor displays a service message (“check the cable” or “non-optimal mode”), and this state does not change after the appropriate changes (replacing the cable, setting the required mode), most likely the problem is in the monitor. A number of monitor models with a MICOM processor ( Samsung lines 710 (N/V), 713/913, some Philips, LG) has a standard malfunction associated with the rapid failure of the processor. Repairing or replacing the faulty processor completely eliminates the problem.
Problems with LED monitors
LED monitors differ in the type of backlighting: LEDs are used instead of lamps. Failure of LEDs, which manifests itself as a decrease in brightness in a separate area of the screen, is quite rare and can be successfully repaired.
Please note that slight uneven backlighting of the LED monitor may budget models already found upon purchase. In this case, the center of the screen is illuminated more than the edges. This is due to the use of cheap materials to create the scattering layers of the screen. Not ideal color reproduction is also a feature of LED monitors; they are simply not designed for professional color work.
One of the common failures of LED monitors is screen flickering, which becomes noticeable when the brightness is reduced. For some models, repairs are limited to flashing the firmware; for others, the processor board needs to be replaced.