What’s wrong with a black laptop screen
1. Laptop screen black screen caused by sleep
Don’t think this little problem is funny , Sometimes after turning the laptop screen or leaving the computer for a long time, or accidentally pressing the laptop sleep button, the laptop sleep button is the power-on button and the computer will go to sleep. Many friends who do not understand computers are often caught off guard when they encounter such a situation. If the computer is sleeping, you can press the power button. Be careful not to press it for too long. If it exceeds three seconds, it will definitely shut down. You can also set the laptop to never sleep when the screen is turned or when the lid is turned.
Settings: Control Panel -> All Control Panel Items -> Power Options -> Edit Plan Settings – > Putting the computer to sleep is: “Never”.
2. Black screen caused by laptop hardware failure
The most common and critical hardware that can generally cause a black screen are power supplies, LCD monitors, memory sticks, hard drives, motherboards, etc. This requires us to rule out one by one. Because the notebook is more precise and the disassembly is more complicated, it is generally difficult to do it yourself, but we can find out the reason and then take it for repairs, which can save a lot of money or repair it by ourselves.
First, check the power supply to see if the laptop battery is charged and whether the power plug is plugged in properly. This only requires Check whether the power indicator light is on, if there is no external power supply, plug it in with the external power supply first. If there is a problem with the notebook power supply itself, even if the external power supply is plugged in, the screen will be black, so we have to remove the power supply first, and then plug in the power supply. Just buy a new one and install it yourself!
If the power indicator is always on and the external power supply is plugged in well, it means that the power supply is OK. At this time, carefully check whether there is wind in the cooling fan port of the notebook, and whether the hard disk indicator light is on. If the cooling fan and the hard disk are all OK, restart the computer, put your ear carefully on the notebook to see if there is a beeping sound, or it is still beeping. Loosen, turn on the machine and plug it in again. Generally speaking, the memory stick is not easy to be damaged, and the chance of the notebook memory stick being loose is not high.
After the above steps have been eliminated, it is necessary to detect the problem of the graphics card or LCD monitor. First of all, we need to prepare an external monitor, which is the best desktop. Use the external monitor to connect to the laptop’s external display interface. This line is the line that usually connects the desktop monitor to the graphics card interface of the host computer. If the external monitor is connected to the laptop, start the laptop, and if the external monitor shows that everything is normal, it means that the laptop motherboard, CPU, hard disk, graphics card, and memory are all right. That’s the problem with the laptop LCD screen. There are several reasons for the laptop LCD screen to be broken: one is the LCD LED screen problem, and the other is that the LCD screen is connected to the graphics card interface or circuit on the motherboard. If such a problem occurs, it is recommended that you do not have to do it yourself, but go directly to the after-sales or maintenance site for testing. If it can be repaired, try to repair it. If it cannot be repaired, replace it with a new monitor screen. If the external monitor can’t display anything, then the motherboard or graphics card is broken. Generally speaking, the probability of hard disk failure is much smaller. Basically, it can be said that the graphics card is broken, the graphics card is burned out, or the circuit connecting the graphics card to the motherboard is broken, because now the notebook graphics card is welded on the motherboard, and the graphics card is broken means that Replaced the motherboard. However, if it is only a poor contact at the soldered place, you can re-solder it.
The graphics card temperature may occur due to the high temperature of the notebook, frequent gaming and poor cooling performance of the notebook Too high direct black screen, blurry screen. At this time, turn off the computer quickly, and take it to check to see if the graphics card has been burned out. If the graphics card is not burned out, you only need to “bath” the notebook, that is, to completely remove the dust, clean the exhaust system again, apply silicone, and replace the electric fan. .
What if my laptop screen keeps flickering?
Reason 1 for computer screen flickering: Whether the display refresh rate is set correctly
The check method is: right-click on the blank area of our computer desktop–Properties–Settings–Advanced–Monitor. It can be seen that the refresh rate of the display is set to “60”, which is the reason why the display screen keeps shaking. Set the new frequency to above “75”, and then click OK to return to the desktop. Some laptops only have the value of 60HZ, so there is no need to set it. In addition, if the setting is too high, it may cause damage to the display, so everyone try to change it. If it has not been touched before, you can directly select the default value.
Reason 2 for computer screen flickering: Check if the graphics card driver is correct
Sometimes when we change the refresh rate of the screen, we find that there is no refresh rate to choose from, which indicates that the driver of the current graphics card is incorrect or too old. At this time, it is best not to use the driver in the CD-ROM when you purchased the computer, but to download the latest version of the driver for the corresponding display card from the Internet, open the “Device Manager”, select the display card option in the device list interface, right-click to click Click to select the “Properties” command, then in the window, click the “Driver” tab, and then click the “Update Driver” button, then follow the wizard to gradually update the graphics card driver to the latest version, and finally restart the computer, if the driver is installed Appropriate, the display refresh rate option will appear, and then set the refresh rate to 75Hz or more to solve the problem.
Reason 3 for computer screen flickering: Is there any interference around the computer
Observe whether there is interference from strong electric or magnetic fields around the computer monitor. Magnetic interference can easily cause the computer screen to shake or flicker. The solution is to place the computer in another Observing in an open place, you can also go to another place to get a good computer to test and eliminate it, and try not to place the monitor near large electrical products. You can also restart the computer monitor to see, generally the current monitor has an automatic degaussing function during the opening process.
Reason 4 for computer screen flickering: monitor hardware problem or power supply problem
The above situations are relatively rare, and the most encountered are hardware problems, such as the amount of data cables connecting the monitor and the host, etc., everyone can use replacement The method of exclusion is solved, and the monitor power supply only focuses on the object of investigation. Among the computer screen flickering and computer screen flickering faults encountered, the most common computer screen flickering is the display power supply problem, and many are the aging of the display and the failure of the display. In addition to the interference of the magnetic field or electric field, the display jitter is the most common problem of display aging. The only solution is to take it to a professional maintenance point for maintenance. Generally new monitors can be taken out for warranty or replacement, and it is generally rare for new monitors to be caused by hardware problems.
Reason 5 for computer screen flickering: computer virus or Trojan horse program attack
Some computer viruses will disrupt the screen display. At this time, use antivirus software to scan the entire computer and remove the virus.
What should I do if the laptop is turned on and the monitor prompts no signal
1. The resolution is set too high
(1) Touch the dark setting Dafa: (Although you can’t see it, you can operate it)
Your monitor may not support your current resolution Rate or refresh rate, go to the desktop and right-click on the blank space, then press c, then press the tab key twice, then enter, then press the arrow key ↓ more than five times, and finally Alt+A. At this point, adjust to the lowest resolution, and then try one by one. I have encountered this problem and solved it this way. As long as your graphics card is not broken and the monitor is not broken, this is generally fine.
(2) If the above method does not work, restart the system, then press the F8 key to enter the VGA mode (low Resolution mode), and then set a lower resolution after saving, enter the normal mode, and then set a correct resolution.
2. Graphics card driver problem
(1) Press the F8 key to enter safe mode;
( 2) In the device manager, uninstall the graphics card driver;
(3) After uninstalling, reboot into normal mode , and then use a software such as Driver Wizard to install the appropriate driver for the graphics card.
3. The graphics card is physically damaged
Some faults are that you can boot normally without driving the graphics card, but after installing the driver, it will not boot normally. For such graphics cards, we can only repair or replace them.
What to do with the white screen of the laptop
1. White Screen reason
(1) Panel drive circuit problem
(2) LCD panel power supply circuit problem
(3) Poor screen wire contact
(4) Mainboard control circuit problem
2. Maintenance method of laptop white screen
(1) First disassemble the casing of the display screen, and then check whether the screen cable interface has any Loose or poor contact.
(2) If there is no problem, then turn on the power switch, and then use a multimeter to measure whether the power supply voltage of the screen cable interface is normal. If it is not normal, then check whether the fuse inductor or fuse resistor near the output end of the screen cable is damaged or open. If damaged, replace it.
(3) If the fuse inductance or fuse resistor near the output terminal of the screen cable is normal, check whether the output terminal voltage of the DC-DC voltage conversion circuit powered by the display screen is normal. If the output voltage is abnormal, check the fuse resistor, switch tube, PWM controller, filter capacitor, inductor coil and other components in the power supply circuit, and replace it immediately if damaged.
(4) If the output voltage of the DC-DC voltage conversion circuit is also normal, it is a fault between the screen cable interface and the output terminal of the DC-DC voltage conversion circuit, and there may be damaged components. Check and replace.
(5) (The above step 2 is also performed directly when the power supply voltage is normal.) If the power supply voltage of the screen line interface is normal, then check whether the driving signal and timing signal in the LCD panel driving circuit are normal. If it is not normal, check the input signal, output signal and power supply voltage of the chip that generates this signal, and judge whether the driver chip is damaged. If damaged, just replace it.
How to Film Laptop Screens
1. Prepare the screen film to be replaced, and wipe the computer screen gently with a rag.
2. Wipe in one direction from top to bottom or from left to right when wiping, and check after cleaning Check if there are any foreign objects.
3. Open the screen film after confirming that there is no foreign matter, tear the film along one side and tear it along While sticking the film to the screen, tear off the protective layer inside.
4. After the film is completely attached to it, you can gently press the film with a tool until the film is completely attached , tear off the outermost protective layer, or not.
How to adjust the brightness of laptops
Method 1:
The screen brightness of ordinary laptops is determined by a pair of buttons on the keyboard. Plus and minus of the “sun” control. To increase the brightness, press “Sun” plus (F8) to decrease the brightness, and press “Sun” to minus (F7). ” key to adjust.
Method 2:
Click the start button, select the control panel, select the power option in the control panel, you can use the above balanced energy saving to adjust the screen brightness, or select the bottom screen Brightness button, adjust the screen brightness and choose the brightness that suits you.
Method 3:
Click the power button in the lower right corner, choose to adjust the screen brightness, you can go in, and then you can adjust the brightness.
Common problems with laptop projection
1. The laptop cannot be connected to the projector
(1) First turn on the computer and the projector , Use a dedicated VGA video cable (that is, the blue pinhole) to connect the computer and the projector. If it can be successfully started, the projector will be directly connected to the computer. If the connection is unsuccessful, re-plug the plug. Determine whether the connection is poor;
(2) After ensuring that the projector and the computer are connected properly, open the notebook interface, right-click anywhere on the desktop, find the screen resolution and click it.
(3) After clicking on the screen resolution, we will select “Connect to Projector” and click in;
(4) We will open the relevant setting options. What we need to pay attention to is that some computers will not display the “connect to projector” link after clicking the screen resolution. At this time, press and hold the windows+p key to display the relevant setting options.
(5) If “Only Computer” is selected, it means that the image will not be displayed on the projector, and the computer will not output the image to the projector; if “Only Projector” is selected, the computer will be turned off Image output on own monitor. As for duplication, the resolution display output on the projector and the computer is exactly the same; there is also an extension function, we can put the image output on one monitor on two monitors, or on these two different monitors. For different resolution adjustments, you need to adjust them according to your actual needs.
2. No content is displayed after the laptop is connected to the projector
(1) The projector has a signal output to the projection cloth, indicating that the projector has no problem; the input key on the projector It is to let the projector automatically search for the computer signal, and the “A signal output” is the output of the VGA signal (the output signal of the computer, etc.). “No Memory Stick” has no effect on the computer output signal to the projection.
(2) Confirm that there is no problem with the computer and the switch has been made on the computer.
(3) Restart the computer to see if the projector can detect the computer signal.
(4) Look at the resolution of the computer monitor. If it is too high, it may exceed the display range of the projector and cannot be displayed. Generally, it is 1024*768.
(5) Check the refresh rate of the graphics card. The refresh rate of the graphics card may also affect the normal output to the projector. Generally, it is set to 60MHZ.
(6) Right-click on the blank space of the desktop, then select “Properties”, then “Settings”, and then deselect “Extend the Windows desktop to the monitor” (note that if it is gray, you cannot Cancel, then switch to another monitor in the monitor selection above).
