First: there is a magnetic field around your monitor
Second: the demagnetization of the monitor (there is a demagnetization coil inside the machine) is bad.
This phenomenon should exclude the relationship between the software / should be the monitor itself.
10.5 Monitor Troubleshooting
Monitor failures can be divided into soft failures and hard failures. Soft failure refers to the display of the monitor is not normal due to software or operating system, while hard failure refers to the monitor failure due to the monitor's own hardware problems. As far as the phenomenon is concerned, the common faults of the monitor include black screen, splash screen, displaying patterns with missing colors, displaying irregular images as well as unstable images, always flickering and so on. Below, we will be specific examples of failure to carry out a comprehensive analysis.
Fault 10.63: monitor screen edge flicker
Fault phenomenon:
Newly assembled machine, somehow in the monitor screen edge flicker phenomenon. Many times off and on, but the fault remains.
Troubleshooting:
This problem may be due to a mismatch in the type of monitor, which can be detected through safe mode. After powering on the computer, press F8 to enter the boot option, select Safe Mode and enter the operating system. If the system no longer flickers, it could indicate that the problem is a monitor type mismatch, as the system does not load any drivers in Safe Mode. If the monitor type does not match, we can right-click on the desktop, select "Properties" → "Settings" → "Advanced" → "Monitor", select "Properties" → "Settings" → "Advanced" → "Monitor", select "Properties" → "Settings" → "Advanced" → "Advanced" → "Monitor". The monitor type can be changed by selecting "Change" and then following the corresponding prompts.
If the flickering still occurs in Safe Mode, it may be a problem with the monitor itself. You can test this by switching the monitor to another machine that is working properly. If it still flickers, the monitor hardware may be at fault. If the flickering no longer occurs, it may be that the driver of the graphics card is incorrect. At this point, you can reinstall the graphics card's driver. In addition, improper socket voltage may also cause similar failures.
Fault 10.64: The monitor often flickers for no reason
Fault phenomenon:
The machine used to run normally, and the monitor worked perfectly fine, but recently the monitor often flickers for no reason, and it is normal for a while, and then it is not normal for a while.
Troubleshooting:
The monitor will be replaced on another normal computer, the fault no longer occurs, indicating that it is not a problem of the monitor hardware. Since the machine used to run everything normal, it should not be the graphics card driver problem. Then what is the problem? Is it a power problem. So, the monitor's power plug removed, replaced in another separate more advanced power socket, and then reboot, the fault is lifted, it seems to be the power supply instability caused by.
In fact, the monitor is often disturbed by the phenomenon of flickering screen, the most common is the cell phone. When we put the cell phone next to the monitor, once a call or message comes in, the monitor's screen will constantly appear to flicker. Therefore, it is best not to place electrical appliances such as cell phones and fans near the monitor to avoid interfering with the monitor's picture.
Failure 10.65: Water ripples in low resolution
Failure phenomenon:
A newly configured monitor has water ripples at a resolution of 640×480, like ripples in the water after a small stone is thrown. But at higher resolutions, such as 800×600 or higher, there is no such phenomenon. Is this a monitor problem?
Troubleshooting:
This is caused by a poor convergence function of the monitor. This is generally not a problem with some name brand monitors, but there are isolated cases of this problem with most brands of 15" monitors. This only occurs at low resolutions, and since most users are currently using 800×600 or higher resolutions, it will not be a big problem in use. However, if water ripples appear at higher resolutions, the monitor is faulty and must be replaced immediately.
Fault 10.66 : Characters go from fuzzy to clear when powering on
Fault phenomenon:
When the monitor is first turned on, the characters are displayed fuzzy and then gradually become clear.
Troubleshooting:
This phenomenon is a precursor of monitor aging. In principle, the electron gun of the cathode tube in the display tube must be heated before it can strike the electron beam, but when the cathode tube begins to age, the heating process slows down. As a result, when the unit is first turned on, the cathode stage tube, which has not reached a standard temperature, is unable to shoot enough electron beams, resulting in the picture we see becoming unclear because there are not enough electron beams to bombard the fluorescent screen. After a long time of use, the temperature reaches the standard requirements, a sufficient amount of electron beam bombardment of the fluorescent screen so that the display becomes clear. This phenomenon generally occurs after many years of monitor use, at which time the monitor has little need for repair. If a new monitor such a problem, it shows that the monitor has signs of aging, immediately replace the monitor.
Failure 10.67: screen display dark blue
Failure phenomenon:
Machine in the boot, the screen displays a dark blue (almost purple), but after a period of time the display is back to normal. Repeatedly turn off and turn on the machine, the phenomenon remains the same.
Troubleshooting:
The screen displays a dark blue color after powering on the machine, and there are generally two phenomena: one is that the display returns to normal after a period of time, and the other is that no matter how much time has elapsed, the display is a dark blue color, and will not return to normal. For the former, generally due to the display of the circuit or components need to be heated, which is the aging phenomenon that occurs when the monitor is used for too long. For this situation, if you send to repair may not be very good or cost more than the loss, the best way is to change a new monitor. If the latter, that is, no matter how long, the screen always displays a dark blue, it may be the problem of the monitor signal cable. You can unplug the signal cable of the monitor, double-check whether there is a lack of needles or a needle bending situation. If there is a lack of needles or needle bending phenomenon, you can replace a new signal line can be.
Failure 10.68: The lower right foot of the screen appears pink
Failure phenomenon:
Just assembled the machine, after booting up, found that the lower right corner of the screen appeared pink piece, I do not know what the reason is? Every time I reboot, it is so.
Troubleshooting:
This kind of phenomenon may be the monitor is magnetized. Currently, most monitors generally have a demagnetization function (usually right on the panel in front of the monitor, usually marked by DRG). You can press the demagnetization button, at which point the entire screen will shake a bit and the pink color should disappear. If you can't solve the problem by degaussing, then you can try changing the monitor to another place so that there is no magnetic source nearby. If this does not solve the problem, then you can only replace the monitor. It is important to note that it is best not to repeat the demagnetization of the monitor within half an hour.
If the monitor does not have a degaussing function, it can be degaussed with a degaussing rod or a degaussing coil. A degaussing rod is a short rod-shaped tool created for the magnetization of monitors, and is generally available in the computer market. When used, you can hold the degaussing rod in front of the monitor screen to the center of the screen as the center of the circle to do a radius gradually expanding circular motion until the demagnetization is complete. If the effect is not obvious once can be repeated several times. When using a degaussing coil for degaussing, you can hold the coil from a certain edge of the screen to the center of the screen to slowly do circular motion to reach the center of the screen and then turn over to the outer circle of the rotation, and so on for many times. Finally, place the coil in the center of the screen, so that it is 90 ° with the screen surface, keep vertical and slowly back away from the monitor 1m away from the place and then turn off the coil power. Repeat the operation until the abnormal phenomenon caused by magnetization of the monitor is completely eliminated. Although the operation of the demagnetizing coil is more complicated than the demagnetizing rod, its effect is much more obvious.
Magnetization of the monitor is in many cases due to the placement of speakers or telephones used by the computer nearby. In general, speakers should be placed more than 20cm away from the monitor to avoid interference with the monitor.
Fault 10.69: The monitor screen shakes from side to side
Fault phenomenon:
When the computer is turned on, the screen on the monitor always shakes from side to side.
Troubleshooting:
This phenomenon is generally due to the monitor is subject to the interference of the surrounding magnetic field. You can first look around the monitor to see if there are things that generate strong magnetic fields, such as speakers, UPS, cordless phones, cell phones and so on. If so, move these things to a place farther away from the monitor. If it is not convenient to move them, move the monitor to a place farther away from them. If there are no such electrical appliances that generate strong magnetic fields, check whether there are high voltage lines around. This is because the current in the cables is enhanced during the peak period of electricity consumption, resulting in a strong magnetic field around the cables, and the electromagnetic waves formed by them cause the emission direction of the electron gun to change alternately, creating a left-right jittering of the monitor's screen. If the problem is the high voltage cable, you can move the monitor to a place farther away from the high voltage cable, and the problem can be solved.
Failure 10.70: "Color blocks" appear on the monitor screen
Failure phenomenon:
When the monitor is turned on, the screen is colorful, and various color blocks appear.
Troubleshooting:
The phenomenon is due to the monitor is subject to the interference of the surrounding magnetic field, the solution can be referred to the previous troubleshooting.
Fault 10.71 : A horizontal line appears on the monitor
Fault phenomenon:
When the monitor is turned on, there is always a horizontal line moving from top to bottom on the screen.
Troubleshooting:
The phenomenon is due to the monitor is subject to the interference of the surrounding magnetic field, the solution can be referred to the previous troubleshooting answer.
Fault 10.72 : Bright spots appear in the center of the screen
Fault phenomenon:
A bright spot appears in the center of the screen at every shutdown.
Solution:
This phenomenon is caused by problems with the monitor's circuitry or the picture tube itself, and should be sent to a repair center for repair as soon as possible. This type of phenomenon if not repaired in a timely manner, over time, will cause the picture tube is burned, the center will appear black spots.
Failure 10.73: display from clear to fuzzy
Failure phenomenon:
After turning on the computer, the monitor will often start to display clearly and then slowly become fuzzy phenomenon, this is the problem of monitor aging?
Troubleshooting:
This kind of failure is generally due to problems with the focusing circuit, there are two possibilities: First, there are problems with the design of the focusing circuit, resulting in a long time after the use of the normal work can not be guaranteed, resulting in a blurred image; the second is due to poor heat dissipation, resulting in the line tube is too hot to form the output power loss, which affects the high-voltage output and accelerated voltage output is not enough to affect the normal work of the focusing circuit, and thus the accelerated voltage output is not enough. affect the normal operation of the focusing circuit.
The solution is to open the back cover of the monitor and adjust a knob inside, which can be used to adjust the high voltage. However, this method is only effective in the short term, because a long time to let the monitor in the adjustment of high voltage will accelerate the aging of the monitor, a long time will still produce poor focus. If this monitor has been in use for many years, then this method can be used to let the last of the heat out of it. If this is a newly purchased monitor, it should be replaced as soon as possible.
Failure 10.74 : Red screen on monitor
Failure phenomenon:
After powering on the computer, the monitor suddenly shows a red screen, is this a problem of monitor aging?
Troubleshooting:
This is a problem of monitor aging, if the monitor has a full red screen, it means that the life of the monitor has almost expired. Through chromatographic analysis, we know that in the chromatogram, the proportion of green and blue is larger, and the proportion of red is smaller, so when the green and blue cathode transistors are slightly attenuated, the monitor will appear red screen.
With this kind of problem, you can hand the monitor over to a professional repairer and use high voltage to electrocute the cathode tube, so that the decaying cathode tube can be temporarily restored. However, this method can only last for a short period of time, and in the end, the monitor still needs to be replaced. If a newly purchased monitor has this type of failure, it should be replaced immediately.
Failure 10.75: After powering on the monitor appears black, and then back to normal
Failure phenomenon:
Computer power on, the monitor is still dark, you can only hear the sound, but after ten minutes the monitor is back to normal.
Troubleshooting:
This problem is generally caused by leakage of the tube seat, just replace the tube seat. Specific operations are as follows:
First of all, open the back cover of the monitor, you can see the end of the tube has a small circuit board, the tube seat is welded to the circuit board. We can carefully unplug this circuit board, and then weld down the tube holder, and then buy a piece of the same tube holder, and weld it back to the circuit board. At this point, do not rush to put the circuit board back, you can find a small piece of sandpaper, carefully the end of the tube protruding feet with sandpaper to wipe open the net, pay special attention to the feet of the oxidized layer. After wiping the circuit board back into the display, the display back cover, and then connected to the monitor, restart to lift the fault.
Failure 10.76: Display internal "squeak"
Failure phenomenon:
When the power on, the display suddenly appeared inside the "squeak" sound, immediately turn off the machine. When the machine is turned on again, the monitor again issued a "squeak" sound.
Troubleshooting:
The "squeaking" sound indicates that the high-voltage pot inside the monitor is on fire. The reason for the fire may be due to the aging of the monitor, which makes some parts of the high-voltage pot not very well insulated, resulting in its constant fire.
You can take the monitor for repair and replace its high-voltage pot.
Fault 10.77: monitor inside the "chopping" sound
Fault phenomenon:
Computer in the boot, the monitor inside the "chopping" sound.
Troubleshooting:
The problem is likely to be caused by dust inside the monitor, which should be cleaned internally. Due to the high voltage electrostatic generated when the monitor is in use has a great adsorption capacity for dust, if the use of the environment is dusty, not only will the surface of the monitor will be stained with more dust, but also its internal circuit boards and other components around a lot of dust, which in severe cases will lead to damage to internal circuits or components, which directly affects the life of the monitor.
When dusting the interior of the monitor, you must be extremely careful. You can disconnect the monitor's power supply, unscrew the screws at the corners of the monitor with a screwdriver, and remove the back cover of the monitor. Then use the brush to dust the monitor, the focus of which is the picture tube, high-pressure pot and the picture tube at the end of the circuit board. For the main circuit board in the middle of the crevice of the dust can be removed with a paintbrush. After the removal is complete, the back cover of the display is installed, turn on the power, restart the problem can be solved.
Failure 10.78: When powering on the monitor, the screen shakes
Failure phenomenon:
When powering on the monitor, the screen suddenly shakes, and the shaking is so strong that sometimes you can't even see the icons and text clearly. But after a minute or two it returns to normal.
Troubleshooting:
This phenomenon is mostly caused by moisture inside the monitor. There are two ways to solve the problem: one is to place the monitor in a drier place; the second is that the machine should be turned on frequently in humid weather, even if it is not in use, otherwise the machine will be easily affected by moisture if it is not used for a long time.
Fault 10.79: The monitor displays "no signal"
Fault phenomenon:
After powering on the monitor, the warning message "no signal" appears.
Failure to solve:
This kind of failure is usually due to the monitor and the computer signal cable is not connected properly. When the monitor is powered on and the signal cable is not connected, a similar warning message will appear. Simply plug the signal cable back in tightly to fix the problem.
Failure 10.80: After the monitor is restored from the sleep state, there is an image in the middle and the two sides are black
Failure phenomenon:
The machine automatically goes to sleep after a period of inactivity, and when it wakes up again, there is an image in the middle of the color display, and the two sides are black, and the monitor can be restored to normal only after restarting or switching it on and off.
Troubleshooting:
The fault should be caused by the monitor. When the computer is in sleep state, the display card does not work and does not transmit any signal to the monitor, which turns to a standby state under low power consumption. When waking up the computer, the display card transmits signals to the monitor, and the monitor will turn to the working state under normal power consumption. At this time, it may be due to the wiring or devices, resulting in the screen can not be opened as the normal state, the result of the kind of situation described above, and can only be restored when restarting the computer or switching on and off the monitor.
In this case, you can first try to pat the monitor casing, to see if the screen can be unfolded, if it can then show that the problem is the monitor, and most likely caused by poor contact. Otherwise, you need to check whether the display card is loose.
Failure 10.81: Power outage caused the monitor screen jitter
Failure phenomenon:
The machine was originally used normally, and then in the course of a sudden power failure. Incoming restart the computer, the system is running normally, but the monitor screen jitter is very serious, restart again, the problem remains.
Troubleshooting:
Preliminarily, this kind of failure is caused by the power outage, you can use the exclusion method to solve. The monitor will be installed to another normal use of the machine, reboot, the screen shows everything is normal, indicating that it is not the problem of the monitor hardware itself. So, the monitor back, open the computer, the fault appears. Check the "display properties" in the resolution and refresh rate settings, there is no problem. Open the "Device Manager", view the "display adapter" and "monitor" two, found that there is no exclamation point, said the two states are completely normal. The newest addition to the list is a new video card driver, which will be installed on the PC after a reboot, but the problem remains the same.
Recall that the power outage was the root cause of the failure, could it be that the host's power supply has a problem? So the chassis will be open, remove the power supply, and then replaced with a normal power supply on another computer, boot again, the display screen shows everything is normal, the fault is lifted, it seems to be due to a sudden blackout caused by the power supply within the capacitor damage. From this, we should also think about if it is a regular power outage, it is best to configure a UBS power supply for their computers, so as to avoid power outages to the computer damage.
Fault 10.82: Adjusting the refresh rate prevented access to the operating system
Fault phenomenon:
The machine was working normally, but then the refresh rate was adjusted to be too high, resulting in a black screen on the monitor. As that refresh rate was saved, it was unable to enter the operating system when it was rebooted again.
Troubleshooting:
When the computer starts up, press the F8 key to enter the boot menu and select "Safe Mode". In "Safe Mode" to adjust the display attributes, if you can not adjust or can not set the display color and other unusual problems, you can "Device Manager" in the graphics card will be removed, reinstall the graphics card driver can solve the problem.
Failure 10.83: Monitor causes chassis leakage
Failure phenomenon:
When touching the chassis with my hand, I found that the chassis seems to have electricity. Tested with a power detector pen, the chassis was indeed electrified. However, it was later found that if the monitor is not connected to the power supply, the chassis is no longer leakage.
Troubleshooting:
It seems that the leakage phenomenon is caused by the monitor. We know that monitors are using three-phase plugs, which is because the monitor manufacturer has placed a ground wire inside the monitor, directly connected to the 3rd phase plug of the monitor power plug. If the power supply's socket is not up to snuff, resulting in a non-functional ground socket, and the ground wire on the monitor is not grounded, the electricity leaking out of the monitor will run to the chassis.
Replacing the power outlet with a ground wire will solve the problem.
Fault 10.84: The image of the monitor is deflected to the right
Fault phenomenon:
The image of the monitor is deflected to the right, and it is ineffective to adjust it with the adjustment buttons on the monitor panel.
Troubleshooting:
First determine whether there is a problem with the adjustment buttons, use the adjustment buttons to adjust other settings, if normal, it is not a problem with the adjustment buttons. The problem should be in the monitor's horizontal oscillator. If the horizontal oscillator is damaged, it is likely to cause the monitor's image to be deflected to one side. Since the monitor's horizontal oscillator is on the monitor's raster board, it is more troublesome to repair, so it is best to send the monitor to a professional repair center for repair.
Fault 10.85: The function adjustment buttons on the monitor do not work
Fault phenomenon:
The function adjustment buttons on the monitor panel do not work, and it is not possible to adjust the parameters such as brightness, offset, screen size, etc. Do you know if there is any way to adjust the relevant parameters of the monitor without using the buttons on the monitor panel?
Troubleshooting:
The failure of the function buttons on the monitor panel is usually caused by the failure of its logic circuit. If it is more troublesome to take it for repair, you can use some software to adjust the relevant parameters of the monitor, such as PowerStrip.
Failure 10.86: The monitor is yellowish
Failure phenomenon:
The machine is configured with a 17 in Acer monitor, and lately the monitor often turns yellowish, and the monitor returns to normal after gently tapping the monitor with your hand. But not long after, it turns back to yellow again, it's really annoying.
Troubleshooting:
For this kind of monitor intermittent color change problem, it is usually caused by poor contact. If the monitor is not used for a long time, it may be the display card connecting cable and the display card plug or the display card connecting cable and the monitor plug there is a poor contact problem, you can carefully check for these two places. If the monitor has been used for a certain number of years, it may be the display of the circuit board and the tube socket contact is not very good. At this point, you need to open the back cover of the monitor to double-check.
Failure 10.87: The monitor screen appears bright bars in the elongated black
Failure phenomenon:
Machine power on for a period of time, the monitor began to malfunction. First of all, the display area of the right side of a thin strip of about half a centimeter, began to be very thin and bright, not long from the entire screen from the vertical began to elongate, and then the screen gradually turned black, until nothing can be seen. The company's website has been updated with the latest information about the company's products and services.
Troubleshooting:
This is a typical line output circuit failure. Due to the gradual increase in temperature, the line output circuit of the transistor leakage current gradually increased, resulting in this phenomenon. The solution is to replace the line output tube.
Failure 10.88: monitor can not wake up
Failure phenomenon:
After the machine entered the sleep state, when knocking on the hard disk or moving the mouse, the hard disk can be woken up, but the monitor is still black, can not wake up.
Troubleshooting:
The monitor can't be woken up from sleep, usually because the monitor isn't recognized correctly under the operating system or the wrong type of monitor has been selected for installation.
The solution is to reinstall the correct monitor. Right-click on the desktop, select "Properties" in the pop-up context menu, and then select "Settings" → "Advanced" → "Monitor". The "Monitor" → "Change" option, and finally select the correct monitor model for installation.
Failure 10.89: Monitor screen changes from large to small after power on
Failure phenomenon:
When the machine is first turned on, the monitor screen is very large at first, and then slowly shrinks back to normal in a few seconds, I don't know if this is normal or not.
Troubleshooting:
This situation is a normal phenomenon, usually have this phenomenon of the monitor belongs to the better quality of the monitor. As the current carried by the deflection coil is very large when the power is turned on (the role of the deflection coil is to allow the electron beam to shoot in accordance with a certain order of arrangement), at this time there may be a large number of electron beams in an instant bombardment of a small piece of the fluorescent screen, resulting in a faster aging of the phosphor of the piece, and ultimately the formation of a dead spot. Therefore, for the more high-grade display will first have a protection circuit to start working, which acts on the deflection coil to make the electron beam spread out rather than focusing on a particular piece. When the current of the deflection coil is normal, the protection circuit will automatically shut down. When you turn on the power, you will see a big picture first, and then back to normal, this process is the process of the protection circuit work.
Fault 10.90: Monitor turns on automatically when an incoming call comes in
Fault phenomenon:
The machine is configured with a Mega XJ500T monitor. For some reason, the monitor turns on automatically when an incoming call comes in, even if you have turned it off earlier.
Troubleshooting:
In fact, this type of monitor has a microprocessor-controlled soft-switching design for its power supply. The power supply section on ordinary monitors generally uses a hard switch, which utilizes the switch itself to directly cut off the 220V power supply. The soft switch is actually a logic circuit, when the monitor is found to be connected to the 220V power supply or when the monitor receives the image signal from the display card, the monitor will automatically enter the working state, even if the monitor power switch is off at this time. This power supply design allows intelligent power management and provides automatic power saving function. The use of power soft switch can effectively avoid the phenomenon of hard-switching power supply repeatedly shocking the circuit due to the current repeatedly shocking the circuit caused by the hand shaking or switching out of place during the power-on process, thus reducing the occurrence of malfunctions. In addition, the use of power soft switches can also reduce unnecessary operations. Because as long as the computer host is opened, the monitor will certainly be automatically powered on, reducing the number of times the monitor is directly switched on and off, playing a role in protecting the monitor. If you don't want it to turn on automatically, use a terminal block with a switch on it.
Failure 10.91: After switching to an LCD monitor, it cannot enter the operating system normally
Failure phenomenon:
The operating system of the machine is Windows 2000, and everything is normal in the original use. Recently, a 14 in LCD monitor was used to replace a 17 in flat screen CRT monitor. After connecting the signal cables, the power-on self-test was normal. However, after the Windows 2000 startup screen, the monitor immediately went black. At this point, the system continues to boot, and everything else is normal, except the monitor does not display.
Troubleshooting:
Because in the use of 17in CRT monitor, the resolution of its desktop for 1152 × 864, and 14 in LCD monitor maximum resolution is generally 1024 × 768. Therefore, the main cause of this failure is most likely that the resolution of the desktop environment exceeds the maximum resolution of the LCD monitor. But why is the Windows 2000 startup screen displayed? This is because the Windows 2000 startup screen is displayed at a resolution of 640 × 480, and the monitor works normally at this time, but after entering the high-resolution login screen, the LCD monitor does not display it. Since you can't change the resolution of the screen by booting the system normally, what should you do?
Find the root cause of the problem, and it's easy to fix. After booting the computer, press the F8 key to enter the boot menu, select "Enable VGA Mode" and boot the Windows 2000 operating system through the basic VGA driver. After entering Windows 2000, reset the resolution, restart the computer, and the problem will be solved. In fact, when for some reason the monitor does not display after system startup (e.g., the monitor was replaced and the new monitor does not support the original high resolution, or an incorrect graphics driver was installed, or the graphics card was replaced), this VGA mode is often very effective in solving the problem.
Fault 10.92: Thumb-sized black spots appear on the LCD screen
Fault phenomenon:
Recently, thumb-sized black spots have appeared on the LCD screen, and I don't know what the cause is.
Troubleshooting:
This situation is usually caused by external pressure. Due to the pressure of external forces, the polarizer in the LCD panel will be deformed, this polarizer is like aluminum foil in nature, and will not pop up on its own after being pressed concave, which will cause the LCD panel to reflect the difference in the reflection of the black spot. However, this does not affect the service life of the LCD monitor, just in the use of the LCD display should be careful not to use your hands to press.