Poor image on the monitor. Blurred image on the monitor: what to do? The main reasons why the computer monitor has a blurry image
For any LSD (liquid crystal) monitor, there is only one resolution at which the display can function normally. In some cases, the problem of loss of image sharpness is solved simply correct setting necessary permission.
More information about the services can be found on the website http://technari.com.ua/ru/services/for-home/notebooks/cable-replacement/. If the cable breaks, images may deteriorate, colors may be distorted, and other problems may occur.
In Windows XP, to set this parameter you need to follow a series of sequential steps:
1. Go to the “Control Panel” and in this window click on the “Display Properties” option.
2. In the window that opens, mark the required resolution value recommended by the display manufacturer.
IN Windows Vista And Windows 7 just needs the following simple steps:
1. Right-click on a free part of the desktop and select the “Screen resolution” option from the context menu that appears.
2. As a result, a window called “Screen Settings” pops up. In it you need to find the line “Resolution” and click on the arrow next to this name with the mouse.
3. A list of possible screen resolutions appears, among which you need to find the line next to which it says “Recommended”. This value will satisfy all the requirements of the installed operating system.
Sharpness adjustment
Windows Vista and Windows 7 allow you to quickly and efficiently adjust the sharpness of the information displayed on your screen, in the form of text or web pages. To do this, perform the following manipulations:
1. Go to the “Control Panel” and use the mouse to call up the “Screen” window.
2. In the window that appears on the left, select the “Clear Type” tab
3. After that, in a new window, mark the monitor to be configured (if there are several of them) and continue to move on.
4. In the windows that open, select the text you like from the point of view of reading comfort.
After testing is completed special program will set custom sharpness values. Sharpness can also be set in the monitor menu. Operating the control buttons, mark the “Clarity” option and find its acceptable level.
It is advisable to start any display settings by installing the required drivers and the recommended resolution. By manipulating the monitor panel buttons, you can manually adjust the brightness and RGB color balance.
Read more:
Here are the TOP 10 most common malfunctions of LCD monitors that I have personally experienced. The rating of malfunctions is compiled according to the personal opinion of the author, based on experience in service center. You can think of this as a universal repair guide for almost any LCD monitor. Samsung companies, LG, BENQ, HP, Acer and others. Here we go.
I divided the malfunctions of LCD monitors into 10 points, but this does not mean that there are only 10 of them - there are many more of them, including combined and floating ones. Many of the breakdowns of LCD monitors can be repaired with your own hands and at home.
1st place – monitor does not turn on
at all, although the power light may blink. In this case, the monitor lights up for a second and goes out, turns on and turns off immediately. Jerking the cable, dancing with a tambourine and other pranks do not help. The method of tapping the monitor with a nervous hand usually doesn’t help either, so don’t even try. The reason for this malfunction of LCD monitors is most often the failure of the power supply board, if it is built into the monitor.
Recently, monitors with an external power supply have become fashionable. This is good because the user can simply change the power source in case of breakdown. If there is no external power source, you will have to disassemble the monitor and look for a fault on the board. in most cases it is not difficult, but you need to remember about safety precautions.
Before fixing the poor guy, let him stand for 10 minutes, unplugged. During this time, the high-voltage capacitor will have time to discharge. ATTENTION! It is DANGEROUS TO LIFE if the PWM transistor also burns out! In this case, the high-voltage capacitor will not discharge in an acceptable time.
Therefore, EVERYONE check the voltage on it before repairing! If dangerous voltage remains, then you need to discharge the capacitor manually through an insulated one of about 10 kOhm for 10 seconds. If you suddenly decide to short-circuit the leads, then protect your eyes from sparks!
Next, we proceed to inspect the monitor’s power supply board and replace all burnt parts - these are usually swollen capacitors, blown fuses, transistors and other elements. It is also MANDATORY to solder the board or at least inspect the soldering under a microscope for microcracks.
From my own experience I will say that if the monitor is more than 2 years old, then 90% there will be microcracks in the soldering, especially for LG, BenQ, Acer and Samsung monitors. The cheaper the monitor, the worse it is made at the factory. To the extent that the active flux is not washed away - which leads to failure of the monitor after a year or two. Yes, yes, just when the warranty ends.
2nd place - the image blinks or goes out
when you turn on the monitor. This miracle directly indicates to us that the power supply is faulty.
Of course, the first thing you need to do is check the power and signal cables - they must be securely fastened in the connectors. A flickering image on the monitor tells us that the monitor's backlight voltage source is constantly jumping out of operating mode.
3rd place - turns off spontaneously
after the time has elapsed or does not turn on immediately. In this case, again, there are three common malfunctions of LCD monitors in order of frequency of occurrence - swollen electrolytes, microcracks in the board, faulty microcircuit.
With this malfunction, a high-frequency squeak from the backlight transformer can also be heard. It typically operates at frequencies between 30 and 150 kHz. If its operating mode is disrupted, vibrations can occur in the audible frequency range.
4th place - no backlight,
but the image is visible under bright light. This immediately tells us that LCD monitors are faulty in terms of backlighting. In terms of frequency of occurrence, it could be placed in third place, but it is already taken.
There are two options - either the power supply and inverter board burned out, or the backlight lamps are faulty. The last reason is not common in modern monitors. If the LEDs in the backlight fail, then only in groups.
In this case, the image may darken in places at the edges of the monitor. It is better to start repairs by diagnosing the power supply and inverter. The inverter is that part of the board that is responsible for generating a high-voltage voltage of about 1000 Volts to power the lamps, so under no circumstances should you try to repair the monitor under voltage. You can read about it on my blog.
Most monitors are similar in design, so there shouldn't be any problems. At one time, monitors simply fell off due to poor contact near the tip of the backlight. This can be cured by carefully disassembling the matrix in order to get to the end of the lamp and solder the high-voltage wiring.
A simpler way out of this unpleasant situation can be found if your friend-brother-matchmaker has the same monitor lying around, but with faulty electronics. It won’t be difficult to make two monitors of similar series and the same diagonal.
Sometimes even the power supply from a monitor with a larger diagonal can be adapted for a monitor with a smaller diagonal, but such experiments are risky and I do not recommend starting a fire at home. But in someone else’s villa, that’s a different matter...
6th place - spots or horizontal stripes
Their presence means that the day before you or your relatives had a fight with the monitor over something outrageous.
Unfortunately, household LCD monitors are not equipped with shockproof coatings, and anyone can offend the weak. Yes, any decent poke with a sharp or blunt object will make you regret it.
Even if there is a small trace or even one broken pixel left, the stain will still begin to grow over time under the influence of temperature and voltage applied to the liquid crystals. Restore defective pixels Unfortunately, a monitor won't work.
7th place - no image, but backlight is present
That is, a white or gray screen appears on your face. First, you should check the cables and try connecting the monitor to another video source. Also check whether the monitor menu is displayed on the screen.
If everything remains the same, look carefully at the power supply board. The power supply of an LCD monitor usually generates voltages of 24, 12, 5, 3.3 and 2.5 Volts. You need to use a voltmeter to check if everything is okay with them.
If everything is in order, then carefully look at the video signal processing board - it is usually smaller than the power supply board. It contains a microcontroller and auxiliary elements. You need to check if they are getting food. Touch the contact of the common wire with one (usually along the outline of the board), and with the other, walk along the pins of the microcircuits. Usually the food is somewhere in the corner.
If everything is in order regarding the power supply, but there is no oscilloscope, then we check all the monitor cables. On their contacts. If you find something, clean it with isopropyl alcohol. In extreme cases, you can clean it with a needle or scalpel. Also check the board with the monitor control buttons.
If all else fails, then perhaps you are faced with a case of broken firmware or microcontroller failure. This usually happens from surges in the 220 V network or simply from aging of the elements. Usually in such cases you have to study special forums, but it’s easier to use them for spare parts, especially if you know a familiar karateka who fights against unwanted LCD monitors.
8th place – does not respond to control buttons
This case can be easily treated - you need to remove the frame or back cover monitor and pull out the board. Most often there you will see a crack in the board or in the solder.
Sometimes there are faulty or . A crack in the board violates the integrity of the conductors, so they need to be cleaned and soldered, and the board must be glued to strengthen the structure.
9th place - reduced monitor brightness
This occurs due to aging of the backlight bulbs. LED lights According to my data, it does not suffer from this. It is also possible that the parameters of the inverter may deteriorate, again due to the aging of the components.
10th place - noise, moire and image jitter
This often happens due to bad VGA cable without electromagnetic interference suppressor - . If replacing the cable does not help, then it is possible that power interference has penetrated into the imaging circuits.
Usually they are eliminated from the circuit design by using filter capacitors for power supply on the signal board. Try replacing them and write to me about the result.
This concludes my wonderful rating of the TOP 10 most common malfunctions of LCD monitors. The bulk of data on breakdowns was collected based on repairs of such popular monitors as Samsung, LG, BENQ, Acer, ViewSonic and Hewlett-Packard.
This rating, it seems to me, is also valid for and. What is your situation on the LCD monitor repair front? Write to and in the comments.
Sincerely, Master Pike.
P.S.: How to disassemble the monitor and TV (how to snap off the frame)
The most FAQ when disassembling LCD monitors and TVs - how to remove the frame? How to release the latches? How to remove the plastic case? etc.
One of the craftsmen made a good animation explaining how to remove the latches from engagement with the body, so I’ll leave it here - it will come in handy.
To view animation— click on the image.
Initially HDMI interface was developed on the basis of DVI, but, unlike the latter, it had support for audio signals and was designed for household appliances - mainly televisions. Later, HDMI ports began to be added to monitors, and this is where confusion arose: television signal is output in a limited color range, and TVs are calibrated so that the picture looks natural in this range. Monitors are designed for the full dynamic range, and accordingly, they display the correct colors only when the image is displayed in it.
First, let's figure out how the signal is output in general. In the vast majority of cases, the RGB model is used, that is, the picture is divided into three color components - red, green and blue. The intensity of each component is specified as an 8-bit number for each pixel, that is, it can vary from 0 (complete absence of a given color) to 255 (correspondingly, the maximum of a given color). In total, we get the opportunity to display 256 x 256 x 256 = 16777216 combinations (color gradations) - this range of colors is called Full RGB, that is, the full dynamic range. However, due to the limitations analog signal V household appliances I had to use a trick and use not Full RGB, but Limited RGB (limited dynamic range) - values are used only in the range from 16 to 235, that is, black is 16,16,16, white - 235, 235, 235. And that’s all we get 219 x 219 x 219 = 10503459 colors, that is, one and a half times less.
What exactly is the problem? It lies in the fact that a video card with an HDMI connection cannot determine what is connected to it - a monitor or a TV, and therefore, in the case of Nvidia video cards, the signal is output by default in a limited range, in the case of AMD - in the full range. There are no problems with video cards from AMD - the monitor works with Full RGB, the video card also produces a signal in Full RGB:
And here Nvidia video cards By default, all devices connected via HDMI are considered TVs and produce a signal in Limited RGB when the monitor expects Full RGB:
As a result, the dynamic range of the image is narrowed, colors become faded, black looks dark gray (because the monitor thinks that 16, 16, 16 is dark gray), white also lacks intensity (because 235, 235 , 235 is no longer white), the same with other colors. That is, the picture suffers quite a lot, and this is especially noticeable with IPS monitors. However, it’s not difficult to fix this: you need to go to the Control Panel, find the Nvidia Control Panel there, go to the “Change resolution” column and set “Full output dynamic range”, and then apply the changes:
Also, if you wish, you can go to the “Adjusting color parameters for video” column and do the same thing there (however, if after this the films begin to look unnatural, it is better to return everything as it was, because some films are cropped to Limited RGB):
That's it, now the image on the monitor should become more saturated.
Of course, all this makes sense only if your monitor is connected via HDMI. If the connection is via DVI or DisplayPort, the video card “understands that a monitor is connected and immediately displays the image in Full RGB.
Question from a user
Hello.
I have quite old computer(for 8-10 years now, I took it from my hands specifically for the dacha). I recently reinstalled Windows on it and the screen started flickering a lot. The eyes get tired quickly, especially against a white background (very noticeable).
How can I stop this blinking?
PS I completely rummaged through the disk from the previous owner with drivers and installed everything that was on it. Did not help...
Good day!
In general, both very expensive monitors and cheap ones can flicker. (both old and new). And many users are very mistaken, thinking that such monitor shortcomings are a thing of the past. In fact, your eye may not see the flicker, but it will (for example, you can indirectly notice this by how quickly your eyes get tired)! Below I will show examples.
As for the author of the question, the reason for the flickering, judging by his description, is associated with the low refresh rate of the screen (this is especially true on older PCs that use CRT monitors (these are so “thick”, see on the right in the preview picture)). As a rule, to fix this problem, you need to install the appropriate drivers for the monitor and video card, and then configure them correctly.
In the article I will analyze these and other reasons in more detail. So...
By the way, I want to add here... If you have ripples on your screen, among other things, vertical and horizontal stripes are running, distorting the image (as in the example below), then you better read this article first: . In it I pointed out the main reasons for this “behavior” of the monitor/PC...
By the way, there is a very good way, find out if your screen flickers (flashes) a lot. Most modern smartphones are equipped with a camera: so, turn on the camera and just focus it on the screen (no need to take photos, just look). It will clearly show whether your monitor is flickering.
As a rule, if something is wrong, you will see vertical/horizontal stripes running on your smartphone (usually from top to bottom (from left to right)). This is the very flickering we are talking about. See example below.
Monitor 1 and Monitor 2 - note the stripes on the second (phone test)
A few words about modern and CRT monitors
Modern monitors, as mentioned above, can also flicker (even if you just brought it from the store, and just at a glance it’s not noticeable). To see if these stripes exist, use your smartphone’s camera or a regular pencil (you need to quickly wave it in front of the screen and see how its silhouette will be displayed (see example below)).
This may happen due to the way the monitor backlight works. (this is not a defect, and the monitor cannot be returned for this reason! To protect yourself from such models, you need to test the device with your own eyes in a store). Typically, this feature appears when brightness is reduced!
Those. the monitor can work perfectly at 80% brightness, but if you try to set it to 40%, you will see (on a smartphone) how the screen starts to flicker (and in my opinion, this is not good).
As a rule, better monitors (in this aspect) use eye protection technologies (Flicker Free, SoftBlue, SmartImage, etc.).
But, I personally came to the conclusion that this does not provide a 100% guarantee. And the best way out is to check the operation of the monitor when purchasing – i.e. ask the seller to turn down the brightness, open a clean White list and point the camera (or buy something specific that you have already looked at reviews and tests on).
If you already have a flickering monitor, then you can try to fix the problem like this: increase the brightness (only moderation should be exercised here), and increase update rate (if possible). Usually, if you reduce the screen resolution, you can increase the refresh rate.
As for CRT monitors, at a frequency below 85Hz screen refresh– it is highly not recommended to work ()! On newer LCD monitors, operation at 60 Hz is also allowed (since the principle of their operation is different).
But I note that, nevertheless, if your monitor is capable of operating at a higher frequency, it is recommended to set it. Below I will show you how to find out the current frequency and how to change it...
Setting the screen refresh rate
Method #1
Press a combination of buttons Win+R, a small window should appear "Run". In the "Open" line enter the command desk.cpl and press Enter.
Next you should open the display settings: depending on the version of Windows you are using, the settings screen may vary slightly. For example, in Windows 10 you need to open the "Graphics Adapter Properties" link.
In the "Monitor" subsection there should be a "Screen refresh rate" tab. Actually, you click on it and change the frequencies to the highest that your monitor supports.
Important point!
If you do not have drivers installed on your monitor or video adapter, then you will almost certainly not be able to set any modes other than 60 Hz (even if your monitor supports them!). In this regard, I recommend using special ones (they will automatically check all your equipment and update everything that is necessary).
Method #2
If you have drivers for the video adapter, then just right-click in any free space desktop, and then in the appeared context menu select their settings (in my case it's "Intel Graphics Settings").
As a rule, in the main section you can specify the refresh rate, resolution, adjust brightness, scaling and other parameters.
About drivers
If you installed all the drivers from the disk (which came with your PC), then it is far from a fact that all of them were installed correctly in the system. Often, after changing the Windows OS, old drivers, even if they can be installed, do not work correctly...
To check if you have a video driver on your system, open device Manager (to do this, use the combination Win+R, then the command devmgmt.msc ).
In Device Manager, open two tabs: “Video adapters” and “Other devices”.
If you have a video driver installed, then in the "Video Adapters" tab you should see the name of your video card (without exclamation marks).
If there is nothing in the "Video adapters" tab, or it says "Standard VGA video adapter" (or "VGA compatible video controller") - then there is no driver on your system. An example is shown in the screenshot below.
In general, I have a “big” article on my blog dedicated to updating the video driver. I recommend checking it out if you have a problem with this.
ADDITION!
By the way, after installing modern Windows 10, you may encounter that the driver will be in your system (i.e. Device Manager will show you that everything is "OK") , but you won’t find links to their control panel. In this case, you also need to reinstall the driver by downloading it from the official website (see link to instructions above).
About cables and cords
The problem with the picture flickering on the monitor screen may be due to cable damage. Often, by the way, when it is damaged by pets...
By the way, it is very advisable to fix the cable (at least with tape (the ideal option is special clamps, see photo below)) so that it does not “dangle” in a slight draft, when someone passes by, or you sit at a computer desk...
About a malfunction of the monitor, video card
I also cannot help but note that distortion of the image on the screen often signals hardware faults (i.e. there is a problem in the hardware). Diagnosing for sure which one is not always easy...
First, I recommend connecting your computer (laptop) to another monitor; and the current monitor - to another PC. This way you can immediately find out where to look for the cause of blinking on the screen: in the system unit or in the monitor (sorry for the tautology).
As an extra!
How to connect a monitor to a laptop -
As for the video card, you can use it to check special utilities, which are capable of performing a stability test. You can find out how to do it from the article below.
Checking the video card for performance, reliability and stability test -
I know that many people do not pay attention to the various flickering and distortions on the screen. However, this is purely my opinion – this should not be ignored! The fact is that a low-quality picture on the monitor not only spoils the impression and emotions (God bless them), but also affects our vision! , tense up, start to tear up, etc. Certainly none of us need unnecessary health problems...
Quite often, when using LCD monitors on desktop computers, you can encounter a problem that the image on the monitor has become blurry. Why did this happen, because up to a certain point everything was normal? To answer this question, you need to understand what is causing this phenomenon, and only then take appropriate troubleshooting actions. Let's try to identify the most common causes.
Why does the image appear blurry?
Speaking specifically about the reasons for this phenomenon, almost all experts identify several of the most common ones, among which the main ones include the following:
- damage to the VGA cable or loose contacts on the connectors;
- incorrect settings the monitor itself;
- inconsistency between monitor parameters and operating system settings;
- problems with drivers.
Note: sometimes an incorrect installation is included in the same list Windows updates, which can most often be found for some reason in the seventh modification. This is due to the fact that some updates (and this is confirmed even by specialists from Microsoft) are simply unfinished, and they contain updates to various VGA drivers, which lead to unwanted effects.
In this case, as soon as you notice the appearance of a blurry image on the monitor, the last installed updates must be removed manually, using at least the item viewing installed updates in the programs and components section, which is called up from the standard “Control Panel”.
A more effective way is to use specialized uninstaller programs like iObit Uninstaller. True, in both cases it will be necessary to re-set the search for updates in manual mode and exclude from those found those that do not need to be reinstalled (as is already clear, updates are removed one by one with a reboot and check of the system). As more simple solution You can suggest the Show or Hide Updates utility, developed directly by Microsoft.
The simplest method for eliminating unwanted visual effects
But let’s assume that everything is in order with the updates or their installation is presumably disabled by the user himself. In most cases, it is believed that the appearance of a blurred image on the monitor can be caused by physical damage to the cable that connects the monitor to the stationary system unit. Try simply unplugging the plugs from the sockets and then connecting again. If this does not help, “ring” the cable or replace it with a new one. If possible, use an adapter to HDMI (the image will be stabilized immediately).
If everything is in order with the cable, try calling up the built-in menu of the monitor and try to adjust the clarity of the picture by changing the device’s own parameters, after reading the technical documentation.
How to get rid of a blurry image on the monitor in Windows 7 or another OS?
As for system settings, you can check them quite simply. On the empty space of the “Desktop”, right-click and select Screen Settings. In the settings, first of all, pay attention to the set resolution.
Almost all monitors are set to the system recommended value. If it is changed for some reason, install the one you need. Outdated monitors can work absolutely correctly in only one mode, but some support several possible modes. Also check your screen refresh rate settings. To start, set the indicator to 60 Hz. However, if the device supports the use of a higher frequency, it is better to use it (it is believed that the higher this indicator, the better the picture).
How to remove a blurry image on the monitor in Windows 10?
When you call the above-described setting item from the “Desktop” in the tenth version of the system, you will be redirected to the corresponding section located in the options menu.
If the zoom option is enabled with a value of 125%, and the panel and window size options have been changed, set the recommended parameters.
Note: if your computer or laptop has an integrated video card rather than a discrete one, you can adjust the necessary parameters to eliminate a blurry image on the monitor using, for example, the built-in “Intel Graphics and Media Control Panel.” If there are special control programs for discrete graphics adapters, it is recommended to change settings not only operating system, but also directly in such applications (at the same time, by the way, you can test the chip together with the monitor).
Driver update issues
Finally, outdated video card drivers can also lead to a blurry image on the monitor. Update them using Windows completely inappropriate. To achieve the optimal effect, use the search for the latest updates of management software like Driver Booster. In the case of discrete graphics adapters, it is better to use specialized applications from the chip manufacturer.
As a last resort, you can find the necessary drivers either on the manufacturer’s website, or search using special hardware identifiers VEN and DEV, which can be determined in the “Device Manager” (through the properties on the details tab), as shown in the image above.
