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Five tips to fix a screen flicker

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When TechRepublic first published steps to keep your monitor free from flickers it was 2001, and the computer world was vastly different. Cathode ray tube (CRT) monitors were the norm, and as anyone who has supported a CRT will tell you, they're far more sensitive than modern LED screens.

That doesn't mean flickering can't still happen to a flat screen monitor: Many of the causes of screen flickers are the same in 2018. Some issues, like electromagnetic interference, are things of the past, but these five tips for fixing screen flickers are largely the same as they were almost 20 years ago.

1. Check your cables

It doesn't matter if you're using a VGA, HDMI, DVI, or displayport cable to connect your monitor to a computer: If the cable isn't securely connected there are going to be issues.

Check the cable at both the computer and monitor ends. If tightening it down or reconnecting it doesn't fix the problem try replacing the cable with a new one. If that doesn't fix the issue it's time to investigate something else.

2. Check the monitor refresh rate

Monitor refresh rate is the number of times the screen image is refreshed in a second, as measured in Hertz. If the refresh rate isn't optimal, or is too low, flickering, lag, and other issues can occur.

You can check the refresh rate on a Windows 10 PC by hitting the Windows key, typing "refresh rate" into the search field, and then clicking on View Advanced Display Info. From there click on Display Adapter Properties For Display 1 (or whichever number display is causing the issue).

Click the middle tab, titled Monitor, in the properties window that appears and you'll see an area to set the refresh rate.

If you're unsure what it should be set to, consult your monitor manufacturer's website and you should find info on the optimal refresh rate for your model.

3. Check the video card

A video card that isn't properly seated on the motherboard can cause a lot of problems, including a screen flicker. Turn the computer off and open the case. Find the video card and check to see if it's properly connected.

If the card is seated on the motherboard properly but the issue persists, a faulty card is likely the issue. Testing this is easy, especially if the problem computer has an onboard GPU that you can plug into.

Power down the computer, remove the video card, and connect the monitor cable to the onboard card or a second video card you've replaced the old one with. If the problem persists then the issue isn't the card--it's something else.

4. Test the monitor

It's always possible the monitor itself has gone bad, but before you consign it to the recycling pile there are a few things you should do.

Inspect the monitor for physical damage as well as using the monitor's onboard buttons to check for settings that may be causing the issue.

SEE: Hardware decommissioning policy (Tech Pro Research)

If everything looks okay it could still be a bad monitor--unplug it and replace it with another one. If the new monitor is working properly you've found your culprit.

5. Is there really an issue?

In the original 2001 article, TechRepublic's Bill Detwiler said something every IT professional can likely attest to having seen before: It may not be a problem and the user might just want a new monitor.

"It is possible that the complaining end user simply wants a newer or larger monitor and thinks complaining about his or her existing screen will accomplish this," Detwiler said, adding that there's a way you can make the user happy and not blow budget money on a new monitor at the same time.

"I recommend giving the offending user a different monitor that you've been using as a spare. Clean it up and tell the user it's a newer model than the one they have. If you're lucky you can even find one that's a bit bigger than the one they had. Everyone's happy, and it doesn't cost a dime."

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Sours: https://www.techrepublic.com/article/five-tips-to-fix-a-screen-flicker/

Screen flickering in Windows 10 is usually caused by a display driver issue or incompatible app. To determine whether a display driver or app is causing the problem, check to see if Task Manager flickers. Then, based on that information, you'll need to update, rollback, or uninstall your display driver or update or uninstall the app.

For more, select any of the following headings, and it'll open to show more info:

Press Ctrl + Alt + Delete to open Task Manager. If you don’t see Task Manager after pressing Ctrl + Alt + Delete, press Ctrl + Shift + Esc to open Task Manager.

  • If Task Manager flickers along with everything else on the screen, a display driver is probably causing the problem. In this scenario, see the Fix your display driver section.

  • If Task Manager doesn't flicker while the rest of the screen is flickering, an incompatible app is probably causing the problem. In this scenario, see the Update or uninstall an incompatible app section.

If you're having trouble seeing your screen properly, you may need to start your PC in safe mode to follow the steps below.

If Windows Update recently made updates to your device, roll back your display driver. Otherwise, try updating or uninstalling your display driver to fix the flickering or scrambling problem.

Roll back your display driver

  1. In the search box on the taskbar, type device manager, and then select it from the list of results.

  2. Select the arrow to expand Display adapters.

  3. Under Display adapters, right-click the adapter, then select Properties.

  4. Select the Driver tab, and then select Roll Back Driver > Yes.

  5. Restart your device.


  • You must have administrator privileges to roll back or uninstall a device or driver package using Device Manager.

  • If the Roll Back Driver option is unavailable, Windows doesn't have a previous driver to roll back to and won't be able to complete this process.

Update your display driver

  1. In the search box on the taskbar, type device manager, and then select it from the list of results.

  2. Select the arrow to expand Display adapters.

  3. Under Display Adapters, right-click the adapter, then select Update.

Note: You may need to contact your PC or display adapter manufacturer to download the most recent driver for your system.

Uninstall your display driver

  1. In the search box on the taskbar, type device manager, and then select it from the list of results.

  2. Select the arrow to expand Display adapters.

  3. Under Display adapters, right-click the adapter, then select Properties.

  4. Select the Delete the driver software for this device check box, and then select OK.

  5. Restart your device and Windows will attempt to reinstall the driver.

Update an app

Uninstall an app

Some apps may not be compatible with Windows 10 and can cause a flickering or scrambled screen. Try uninstalling the app, here's how:

  1. Select the Start  button, then select Settings  > Apps > Apps & features. It'll take a moment for your apps to appear.

  2. Scroll down the list and find the app you want to uninstall.

  3. Select the app, and then select Uninstall > Uninstall. If you're asked to confirm your choice, select Yes.

After you uninstall the first app, restart your device and check if the screen flickering or scrambled issue is resolved or not. If it's not, uninstall each app one by one until the issue is resolved.

Reinstall an app

  1. Select the Microsoft Store  icon on the taskbar.

  2. Select More  > My Library.

  3. Select the app you want to reinstall, and then select Install.

If your app isn't in Microsoft Store, reinstall it from the manufacturer's site.

Sours: https://support.microsoft.com/en-us/windows/troubleshoot-screen-flickering-in-windows-10-47d5b0a7-89ea-1321-ec47-dc262675fc7b
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How to Troubleshoot LCD Screen Flickering

Have you experienced screen flickering with one or more liquid-crystal displays (LCDs). In recent decades, LCD has become the preferred display technology used in computer monitors, TVs, smartphones, tablets, human machine interfaces (HMIs) and other display devices. When compared to cathode-ray tube (CRT), LCD is more energy efficient, longer-lasting and offers better image quality. But LCDs aren’t immune to problems, one of which is screen flickering.

What Is Screen Flickering?

Screen flickering is a phenomenon in display devices that manifests as either white or black frames “flashing” between images. It’s most common with CRTs and plasma display devices, though it can occur with LCDs as well. It’s called “screen flickering” because it literally looks like the display device’s screen is flickering. At various intervals, the screen will flicker with either white or black frames.

Is Screen Flickering a Problem?

The good news is that screen flickering typically won’t harm or otherwise damage an LCD. Nonetheless, it can still negatively affect the performance and utility of an LCD. If an LCD suffers from screen flickering, it may strain your eyes when you use it. When the black and white frames appear, they’ll force your eyes to transition, which can cause eyestrain when viewed for a prolonged period.

How to Fix Screen Flickering

There are several steps you can take to reduce or even eliminate screen flickering, one of which is to raise the refresh rate of your LCD. Refresh rate refers to the number of times an image is refreshed each second. If an LCD has a low refresh rate, images will update more slowly on screen. And between these updates, the LCD may show white or black frames, resulting in screen flickering. By raising your LCD’s refresh rate, images will update more quickly so that screen flickering isn’t a problem.

In addition to raising the refresh rate of your LCD, you should also check your display device’s connection cable. Whether it uses an HDMI, A/V or other connection, a loose cable can cause screen flickering. Therefore, you should unplug the cable and reconnect it to ensure a tight and secure connection. If that doesn’t work, you may want to try a different cable.

LCDs are often preferred over CRTs and other display devices because of their energy efficient, long-lasting properties. With that said, some LCDs may experience screen flickering. This phenomenon is usually the result of either a low refresh rate or improper cable connection. By tackling these two issues, though, you can protect your LCD from screen flickering.

Sours: http://www.nelson-miller.com/how-to-troubleshoot-lcd-screen-flickering/
✔✔ How To Fix Screen Flickering - Blinking - Flashing - issue - 2019 🔥

Compared to older displays, LCD monitors are an excellent low-cost, low-power solution to our need for a computer display. Unfortunately, some monitor settings can make an LCD screen appear to flicker.

A flickering LCD monitor is more than just an annoyance. It can cause eye strain, headaches, and a host of other ailments, especially if you spend a great deal of time in front of your computer. Luckily, there are some steps you can take to stop the flickering and avoid these problems. In this article, I’ll show you how to stop your LCD monitor from flickering.

What Causes an LCD Monitor to Flicker

Although your computer monitor may appear to be a still image when no one is using it, it is actually being updated constantly. Much like a film strip is just a bunch of static images displayed quickly, your monitor updates at a fast rate to make it look like things are moving smoothly on the screen.

The rate at which your monitor updates is measured in Hertz. One Hertz is equal to one cycle per second. If your monitor is set to update at a rate of 100 Hertz, then it is refreshing 100 times per second. The Hertz used to measure monitor refresh rates is similar to the Gigahertz used to measure the speed of your CPU, except that Gigahertz is a measure expressed in billions of cycles per second.


If the refresh rate on your LCD monitor is set too low, it can appear to be flickering since there aren’t enough updates per second. While some people are comfortable with around 30 Hertz, others can see the flickering and require a higher refresh rate. The most common refresh rate is 60 Hertz.

There are other factors that can cause screen flickering and I have mentioned those at the bottom of this post.

Setting the Refresh Rate for an LCD Monitor

The refresh rates that you can set for your LCD monitor are largely determined by the capabilities of your monitor. While some LCD monitors can take advantage of several different refresh rates, others are confined to just one or two.

To choose a new refresh rate for your LCD monitor in Windows, begin by clicking on Start > Control Panel > Appearance and Personalization > Display. If you are on Windows 8 or 10, just right-click on the Start button and choose Control Panel. If you’re in icon view, you can click directly on Display.


On the left hand side of the window, click on Change Display Settings.

change display settings

Finally, click on Advanced Settings at the bottom right of the window.

advanced display settings

Click on the Monitor tab and you will notice a few things. First, notice the setting labeled Screen Refresh Rate. This is the current refresh rate for your LCD monitor. Click the drop down menu and Windows will display all of the refresh rates possible for your monitor.

It is likely that your monitor can only use one or two refresh rates, so this list may not be long. Some manufacturers build monitors that can display anywhere from 30 Hertz to 200 Hertz. Normally, monitors with higher refresh rates will be more expensive. A common refresh rate for gaming monitors is 144 Hertz. If the price of a monitor seems too cheap to you, it’s probably because it has a low refresh rate. For example, some new 4K monitors are cheap, but are only 30 Hertz, which can make everything look choppy on the screen.

Also, a lot of monitors will show 59Hz and 60Hz and you can pick between the two. So what’s the difference? It’s basically something to do with rounding and it really doesn’t matter. You can read the exact details on 59Hz vs 60Hz here.

monitor refresh rate

From here, you can try a higher refresh rate and see if the flickering stops. Usually this does the trick. If it doesn’t work or there is only one refresh rate listed, there are two things you can try.

First, make sure you are using the latest driver for your LCD monitor. If the driver is outdated or Windows is using a generic driver, the number of refresh rates available may be limited. Visit the manufacturer website and download the latest driver for your version of Windows.

If that doesn’t work, you can force Windows to use a refresh rate that is not technically supported by the monitor. Be careful, though, because it is possible to damage your monitor hardware if you do this.

On the Monitor tab shown above, there is an option that is checked by default called Hide Modes That This Monitor Cannot Display. By unchecking this option, you can force Windows to use any refresh rate for your monitor that you want.

Notice that right underneath this option, Windows warns you about an unusable or damaged display. Uncheck this option and set your monitor to an unsupported refresh rate at your own risk. Depending on your version of Windows, this option may be grayed out, meaning you can only pick from the refresh rates listed in the box.

For Mac users running OS X, you can go to System Preferences and click on Display. Here you can change the refresh rate for an external display connected to your Mac.

refresh rate mac

Other Screen Flickering Causes

If changing the refresh rate doesn’t fix the flicker on the screen, it could be related to other factors. Here is a list of other items you should check:

Cable – If you can, change the cable connecting your monitor to your computer. In some cases, a defective cable can cause the signal to break while being transmitted across the wire.

Input Port – Another solution is to use a different port on the monitor, if possible. For example, if you are connecting using HDMI, try DVI or DisplayPort or VGA instead and see if that fixes the problem.

Surroundings – In addition to hardware issues, electromagnetic fields can also cause screen flickering problems. If you have something else plugged into the same power strip like a heater, fan, etc., try removing it.

Video card – If there is an issue with your video card, it will obviously effect the output on the screen. Update the drivers and open your computer to ensure that the video card is properly seated in the slot.

Monitor – Lastly, the monitor itself could be damaged or defective. Try connecting the monitor to another computer to see if the problem goes away or remains.

Hopefully, this will help you figure out what’s causing the flickering issues with your monitor. If you have any questions, feel free to comment. Enjoy!

Sours: https://www.online-tech-tips.com/computer-tips/fix-flickering-monitor/

Monitor flickering lcd

The most visible and yet often most underappreciated part of any computer system is the monitor. It’s where your movies play, your spreadsheets are displayed, and where your gaming adventures come to life. The slow but sure development and improvement of LCD and LED monitors over the last twenty years has put top-quality displays within reach of even the most limited budgets, to the point that the older CRT monitors are all but extinct from the marketplace. Monitor flicker, unfortunately, hasn’t followed CRT monitors onto the ash-heap of history. Although the new monitors are far more reliable than the old CRT technology, it is still possible for them to develop a flicker. But don’t panic – if your computer monitor does start flickering, it doesn’t automatically mean it’s curtains for that piece of hardware. It could just mean a driver refresh is required or that you or someone else previously made changes to the Windows configuration.

What to Do if Your Computer Monitor Starts Flickering

In this article, you’ll troubleshoot your flickering monitor so that you can find out what’s wrong and fix the issue.

Why a Computer Monitor Flickers

Even though the display on your computer screen looks like it’s a static picture, it’s not. Instead, the image is constantly redrawn and erased at a rapid rate that your eyes can’t perceive. A modern screen can refresh up to 100 times per second or even more. This action refers to the refresh rate, and it gets measured in Hertz. When you look at monitor specifications, you will see a number such as 60Hz, 100Hz, or something else. The number indicates how many refreshes occur per second. On a 60Hz monitor, the screen refresh runs 60 times per second. A 100Hz monitor will refresh 100 times per second. The faster the refresh, the quicker the display reacts to changes and the smoother the experience. This outcome is why 100Hz TVs became so popular and why 100Hz computer monitors are ideal for gaming where the display changes constantly.

Different people are more sensitive to refresh than others. Some people can run monitors as slow as 30Hz and still see a perfectly stable screen. Other people will be able to detect the refresh and will see it as flickering.

Steps to Fix a Flickering Computer Monitor

1. Check The Monitor Cable

Both ends of a monitor DVI cable have screws to hold them securely in place, but not everybody uses them. Ensure both ends of the connectors are secure and that they are held tightly in place. If securing the connection doesn’t fix the flicker, the cable itself may be defective. Grab a spare one and swap them out to see if that resolves the problem.

2. Check Power

Check that both ends of the power cable are also secure. A loose power cable can sometimes cause a screen to flicker, and a buzzing sound often accompanies this.

3. Check Display Settings

If you have recently updated your graphics driver, check the display settings to ensure nothing has changed. Right-click a blank space on the desktop and select your display settings. The menu option will vary depending on the manufacturer of your video card. On my PC, the entry says “NVIDIA Control Panel.”

Open the graphics control panel and select Change resolution (NVIDIA wording). Select the flickering monitor in the options and make sure the refresh rate is at least 60Hz. If you have a 100Hz monitor, set it to that. Save any changes and retest.

You can also check through Windows 10 Settings. Navigate to Settings and System. Scroll down and select the ‘Display adapter properties’ text link in the center box. Select the Monitor tab and check the refresh rate from there.

4. Check Your Graphics Card

Issues with the graphics card can sometimes cause a monitor to flicker. These situations are unusual, but it is a possibility. If you have multiple monitors and only one screen acts up, the issue isn’t your graphics card. If all monitors, or your only monitor, flickers, it is worth checking out the hardware and connections.

Check that your graphics card does not have accumulated dirt and dust on the surfaces. Make sure the cooling fan is working and that all case fans are turning when they should. Use Speedfan or a similar program to monitor the temperature of your card, as overheating is a prime cause of most graphics card issues. If all looks okay, it might not be your graphics card causing the flickering.

5. Check The Monitor

The final potential cause of your computer monitor flickering is the monitor itself. You can try testing the monitor by changing the port you are using. If you use a DVI connection, try using the VGA or DisplayPort output. If nothing changes, you may need to borrow another monitor to test. Or test your monitor on another computer that you know works fine. If the monitor flickers on another computer or with a different hardware connection, then sad to say, your monitor has probably reached the end of its life. Monitors are repairable, but the repair will likely cost more than just buying a new one unless your monitor is very high-end and expensive.

I hope these suggestions help you diagnose your monitor flicker problem. If you have other suggestions for diagnosing monitor problems, please share them with us below!

Sours: https://www.alphr.com/computer-monitor-flickering/
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