If the screen turns off periodically while the computer is working, then the cause of this problem does not always lie on the display itself. It can be associated with a video card, connection cable, RAM operation, etc. There are many reasons, and this article is devoted to the consideration of the main ones.
Problems with permanently turning off display are among the most difficult. It is very problematic for an ordinary user to diagnose and identify the cause at home. Such violations are associated with either hardware or software malfunctions. The former, as a rule, require contacting a service center, and the latter can be learned to identify by studying this article.
Cause 1: Monitor malfunction
If the monitor turns off while the system unit is running, then problems with the main output device cannot be ruled out. Most monitors have protection that is triggered automatically when overheating occurs. But it will not be possible to check the temperature of the device by standard means. Therefore, here we can only advise you to check it by touch. If the display case is too hot, it should be placed away from a wall or somewhere with better air circulation.
An increased level of humidity is one of the reasons for the periodic shutdown of the display. Move the monitor to a place free of high humidity and let it stand for a while. The monitor should not be connected to the network. And if corrosion has not yet had time to form, then after all the moisture has evaporated, the device should return to normal operation.
Disconnect the output device from the system unit. On the screen, you should see an inscription like "No signal" or "No connection". If there is no such message, then you need to contact the service center.
To remove the monitor from the range of potential causes of the problem, you just need to connect another output device to your stationary PC or laptop. If there is still no image, then the fault lies with the video card or cable.
Reason 2: Defective cable
The most common cause of intermittent shutdown of an output device is cable damage. The most commonly used connectors for displaying on the screen are DVI, HDMI. But the VGA format is still found. Make sure the plugged in cable is held securely and twisted at both ends (DVI).
- First, try connecting the display to another computer using the supplied cable. If there is no change, just replace the cable.
- If changing the cable does not solve the problem, then there is a malfunction in the monitor itself.
- If the problem disappears after connecting to another computer, then the problem is not related to the display or the cable. In this case, you should look for the cause in the depths of the system unit.
Reason 3: Malfunction of the video card
Another logical reason for constantly turning off the monitor screen may be a hardware failure of the graphics adapter. For such cases, the following is typical:
Read about what should be done in such cases at the link below:
Reason 4: Overheating of the video card
All modern PCs (including laptops) have two graphics cards on their motherboards: an internal and an external one. In the default settings, preference is given to the video card that is considered to be more productive (usually discrete). Therefore, it is necessary to monitor the temperature of the external graphics module.
In most cases, the normal operating temperature of the graphics adapter is considered to be less than 60 degrees Celsius. But this is almost impossible to achieve on powerful video cards. The maximum peak (100% load) is usually defined at 85 degrees. For individual GPUs, the peak maximum reaches 95 degrees.
For almost all existing GPUs, the maximum allowed upper limit is 105 degrees. After that, the graphics module of the board lowers the frequency for cooling. But such a measure may not give results and then the PC restarts.
The first step is to make sure that the video card is not cooling properly. For this, there are, for example, temperature monitoring software. Let's consider two of them.
Method 1: GPU-Z
Method 2: Speccy
Let's consider the main reasons leading to insufficient cooling of the graphics adapter.
Dust
If the PC has not been cleaned of dust for a long time, then it's time to start. There is a possibility that dust inside the system unit or on the cooler of the video card does not allow the latter to cool normally. Dirt and dust on the card cooler itself in particularly severe cases can cause it to stop. Dust cleaning does not require special skills: you need to disassemble the system unit or open the laptop case, then use a vacuum cleaner or a soft brush. It is recommended to carry out such cleaning at least 2 times a year.
Laptop design features
Some laptop manufacturers do not think about a reliable heat dissipation system already at the design stage of a certain model. In such cases, portable computers have, for example, very small grilles on the case, which logically leads to constant overheating of the entire device. Here, care should be taken to place any stand on the back (or front) of the laptop, lifting it up.
Alternatively, you can use special cooling pads for laptop computers. They allow more intense air to run through the computer. There are models that are USB powered and also have their own battery.
Loss of thermal paste properties
Heat transfer between the GPU and the cooler is carried out through a special intermediary - thermal paste (or thermal interface). Over time, the substance loses its properties, which leads to insufficient cooling of the graphics adapter. In this case, the thermal paste must be replaced urgently.
Note: Disassembling the video adapter will void your warranty if it fails. Therefore, you should contact an authorized service center. If the warranty period is over, read the link below for a guide to replacing the thermal interface for a graphic card.
Reason 5: Power saving mode
All versions of Windows have a special service that turns off devices that are not currently in use. The purpose of this function is to save energy. By default, OS downtime is never less than 5 minutes if it is a desktop computer or laptop. But various erroneous manipulations by the user himself or by third-party programs can change this time to less.
Windows 8-10
Windows 7
Windows XP
Reason 6: Video card driver
Incorrect graphics drivers are not often associated with the issues under review. But it is not worth completely eliminating the influence of the conflict of drivers (or their absence) on the unstable operation of the display.
- We load the computer into "Safe Mode".
- Push "Win" + "R".
- Then we introduce "Devmgmt.msc".
- We find a discrete card (if any) in the section "Video adapters"... There should be no yellow icons with an exclamation mark next to the device name.
- Using RMB, click on the name of the adapter, then select "Properties".
- In field "Device status" normal operation should be indicated.
- Next, go to the tab "Resources" and make sure there are no conflicts.
Read more: How to enter "Safe Mode", on,
If the device is displayed with problems (additional icons, resource conflicts, etc.), then the adapter driver should be removed. To do this, do the following:
This method is effective for problems with video adapter drivers. Unfortunately, it doesn't always bring results. In difficult cases, the user will be required to search and install the driver manually. How to do this, read the links below.
Tip: First of all, you should find and install drivers for the motherboard (if you have not installed them), then all the rest. This is especially true for laptop owners.
Reason 7: RAM
One of the most common reasons for the monitor to turn itself off is a malfunctioning RAM. To detect such problems, there are special tools for checking RAM for errors. Even if a malfunction occurs in a single module, this is enough to periodically turn off the monitor while the PC is running.
RAM modules are not suitable for repair, so if you find problems in their work, you should purchase new ones.
Method 2: System RAM Checker
Another way to check the RAM does not require additional software. The OS itself has a special tool.
To run RAM diagnostics using the Windows operating system itself, you must:
Thus, to determine the reason for the inoperability of the monitor, the user will need to follow a series of steps. Some of these measures relate to simple and effective exclusion diagnostics. For example, display and cable hardware problems are easily identified. Software methods require quite a long time, but one cannot do without them to exclude a malfunction of the RAM.
The proximity sensor is responsible for the function of dimming the iPhone screen during a call. It fires when something covers it. During a conversation, this "something" is the person's head, to which the iPhone is brought. Thus, if the iPhone screen does not turn off during a call, the proximity sensor is to blame. How to figure out why the screen does not turn off during a call on the iPhone was described in this guide.
Apply a piece of tape to the proximity sensor
The most common problem with the proximity sensor occurs after replacing the screen on an iPhone. The sensor brings to senses one repeatedly proven method. You need to stick a small piece of transparent tape on the sensor, and then paint over the tape with a black marker.
Service center technicians also point out that instead of scotch tape, it is more efficient to use a piece of rubber band about 5 mm long. It needs to be glued between the light and proximity sensors, after which the problem with the turned on iPhone screen during a call will disappear.
Of course, the iPhone will have to be disassembled to gain access to the sensor. You can do it yourself. The instructions below show you a detailed breakdown of various iPhone models.
Garik
Recently I noticed that the screen of my iPhone does not go blank during a call. You can accidentally press something with your cheek or ear. How do I activate the display mute during calls?
Hello.
If the iPhone has been jailbroken, it may be due to the installed tweaks and their settings. If the device has not been jailbroken, then the probability of a software failure is too small. You cannot intentionally turn off screen fading during a call.
Initially, the system turns off the display when the smartphone approaches something. A sensor located above the earpiece is responsible for this.
To check, you can try to restore iOS via iTunes (without downloading a backup) and make several calls. If the screen still stays on, there is a problem with the proximity sensor.
Sometimes the sensor stops working after gluing the film to the display. The protective layer may not have special holes for the sensor to work, it may be too dense, or debris may get between the film and the display.
In such cases, the sensor may not work correctly, you should check its operation without a protective cover.
If after such a check the screen does not go out during a call, you will have to contact the service center.
If on Android the screen does not turn on after a conversation or does not go out during a call when you bring it to your ear, then you should look for the cause of the problem in operation. If it breaks down, the device cannot correctly determine the position in space, so the screen does not light up, but the phone works.
This article is suitable for all brands that produce phones on Android 9/8/7/6: Samsung, HTC, Lenovo, LG, Sony, ZTE, Huawei, Meizu, Fly, Alcatel, Xiaomi, Nokia and others. We are not responsible for your actions.
Screen problems when calling on Android
The main function of the proximity sensor is to automatically turn on and off the backlight during a call. This saves battery power and prevents accidental pressing of your ear or cheek on the touch screen of your gadget.
If your Android device does not turn off during a call, or the screen does not turn on after the call ends, then the problem should be looked for in the sensor's operation. The reasons may be as follows:
- Poor visibility (covered / covered with a protective film or cover).
- Out of RAM.
- Problems with the firmware.
- Ingress of moisture.
- Mechanical impact and damage to the loop or other components.
Wipe the screen thoroughly before proceeding with software troubleshooting. Pay special attention to the upper part, where the proximity sensor is located. If a film or glass is glued to the display, then over time they can lose their transparency and also interfere with the sensor.
Then check the call settings - it is possible that the parameters are incorrectly set in them, and the sensor is simply turned off. Not all phones have this option, but it's worth checking out.
- Open the settings and go to the section "My devices" or "Options".
- On the Calls tab, make sure there is a check mark next to Proximity Sensor.
Enlarge Also, make sure the system has enough RAM to operate the sensor. Open the list of applications in the settings and on the "Running" tab see how much RAM the phone is using. If you find a shortage, close unnecessary applications.
If everything is set correctly in the settings, but the sensor does not work, make a backup copy of important data and reset the Android settings to the factory state. If the problem persists after a hard reset, then you will have to flash the phone. If no software methods, including flashing, have fixed the problem, it is recommended to contact the service center to diagnose hardware faults.
Problems with the screen on Android after sleep mode
Another problem that can arise with the screen is that it does not turn on after sleeping. It may be black or black, but the phone works. If you are faced with such a situation, then know that the reasons can also be software and hardware in nature:
- Out of RAM.
- Problems with the firmware.
- Incorrect operation of the power button.
- Mechanical impact (impact, fall).
- Ingress of moisture into the housing.
If the phone does not turn on, but vibrates when there is an incoming call or other actions, then there is a high probability that the problem can be fixed without contacting a service center. Clean up RAM from unnecessary processes by shutting down unnecessary applications at the moment. If this does not help, make a backup of important data and reset the system settings to the factory state.
Enlarge If the hard reset also did not fix the problem, you will have to flash the device. It's important to remember to make a backup before every major tampering operation on Android.
