Common Computer Fault repair-video card and display

The video card and display constitute a computer display subsystem. Under normal circumstances, the failure rate of the video card is not high, but as the number of applications increases and the performance increases rapidly, the failure rate of the video card increases rapidly. A display is a special part in a computer. It is relatively independent from the host. As a strong electrical device, we cannot maintain it without authorization.
I. Common installation and usage faults of graphics cards
1. video card hardware and installation faults
If the black screen is turned on, and the chassis horn is issued as "nobody ...... Didi ......" Two consecutive transient alarms and repeated alarms indicate that the display card is not properly inserted or the contact is poor. In this case, turn off the power supply, open the chassis, re-plug the video card, and tighten the baffle plate screws. If the fault persists, it may be caused by a problem in the video card hardware. Generally, the display chip or video memory is burned out. We recommend that you take the video card to another machine and try it out, if the problem is identified as a video card problem, you can only change it.
2. the driver is not properly installed.
Some graphics cards are easily installed on the VIA chipset motherboard, which is difficult to be installed normally. IN this case, first install the latest 4 IN 1 patch on the motherboard. If there is another problem, it is likely that the video card conflicts with other devices, you can do the following: Open "Control Panel"> "system" and check whether the video card resources conflict with other devices, and make corresponding adjustments. At the same time, the BIOS "PNP/PCI Configuration" contains the option "Assign IRQ for VGA" (Assign an interrupt number to the vgacard). If it is not set to Enabled, some graphics cards cannot be properly installed.

3. Display Screen Problems
In the case of screen display, the display has the highest possibility of quality problems. In addition, if the video card or CPU exceeds the frequency, this type of phenomenon may also occur. You can also try to adjust the resolution, number of colors, and refresh frequency to see if the situation has improved. If the video card is used for a long time, if the heat dissipation is poor, the screen may be displayed. In addition, improper memory expansion can easily lead to screen display. It is best to use the same brand, the same speed of memory expansion.
4. Focus on the heat dissipation of the video card.
Now, the new 3D graphics card, the main chip is a dedicated CPU, its power consumption is not lower than the CPU, the fever is very bad. Therefore, we must pay attention to the heat dissipation of the video card when using the video card. Poor heat dissipation of graphics cards may cause screen display and unstable operation. If you work at high temperatures for a long time, the thermal stability of the video card chip may decrease, and the display card may be damaged. Currently, many graphics cards have their own heat sink or cooling fan. If not, try to add it by yourself.
5. compatibility issues with the AGP Interface
Correct understanding of the compatibility of the AGP interface makes sense to solve the fault caused by the interface compatibility problem. To put it simply, the AGP8X specification is incompatible with the old AGP1X/2X mode, while most AGP4X graphics cards are compatible. For the AGP4X slot, the AGP8X video card can be used, but it only works in AGP4X mode. To enhance the compatibility of the video card, you should upgrade the BIOS version of the motherboard to the latest version, and then check whether the system is working under a non-standard external frequency. You can also change a good power supply, remove unnecessary plug-ins and peripherals as much as possible to enhance the power supply capability of the motherboard to the video card.
Ii. Common CRT display faults
Here, I would like to emphasize that, due to the high operating voltage of the internal components of the monitor, professional repair points should be promptly sent for repair in case of serious exceptions, rather than handling them at will, to avoid fire and personal injury. In addition, some monitors are "Faulty" because of the "low-level negligence" on our installation and usage, such as failing to turn on the power switch of the monitor or loose the connection signal.
1. Abnormal display color
Improper use or maintenance may lead to poor display. The problem of the video card and the display signal line should be ruled out first. In many cases, poor contact of the signal line will lead to the problem of the display color.
Most of the time, it is likely that the display is magnetized. The CRT display will be magnetized by something with a strong magnetic field and lead to the problem of partial color, such as the unshielded bass speaker. Generally, the display can be automatically demagnetized after it is started, or it has the manual degaussing function, however, the degaussing function of the display itself is limited. If the display is seriously magnetized, it cannot be completely demagnetized only by using its degaussing function. In this case, you need to use special equipment (such as degaussing rods) to demagnetize. Of course, if the screen is still partial after degaussing at a professional repair point, it may be because the monitor has quality problems. For example, if the degaussing device is burned out, it can only be repaired.
2. the refresh frequency cannot be adjusted.
Some friends often encounter the problem that the display refresh frequency cannot be adjusted during "display attributes. The failure to adjust the display refresh frequency is mostly due to the failure to select the correct display type.
The choice of the display type is often overlooked. Many friends set the display type to "spuer vga, as a result, the refresh frequency of the video card cannot be adjusted (because the incorrect refresh frequency parameter may cause harm to the display, the system cannot identify the display, always set according to the most conservative default status (60 hz ). The solution is to select the correct display type in the display properties. If you are using a miscellaneous display that is not recognized by Windows, you can choose a product with similar performance. In addition, the adjustment of the refresh frequency is also related to the graphics card driver. Some drivers support more update rate adjustment options.
3. Abnormal display Noise
Some older monitors change to the game status every time (that is, switching from the desktop to the game status), a sound of "snap" occurs, because a mechanical relay is used to switch the resolution and refresh rate, it should be normal to make a beep, not the quality of the monitor. Now all the new models of displays have adopted the new mute electronic switching design. This problem should no longer exist.
However, pay attention to the abnormal sound caused by high-pressure fire. Abnormal sound on the monitor may be caused by high-voltage packaging and other hardware problems, generally due to too much dust, wet environment, etc. If this phenomenon occurs frequently, please repair it as soon as possible. The use environment of the monitor must be kept as dry and clean as possible.
Iii. LCD Common Faults
1. Water ripple and screen issues
First, check whether there is an electromagnetic interference source around the computer. Then, replace a video card or connect the monitor to another computer. Check whether the video card is correct. Then, adjust the refresh frequency. If the above reasons are ruled out, it is likely that the quality of the LCD is poor, for example, there is a problem of poor thermal stability. Water ripple is a common quality problem of LCD, which cannot be solved by yourself. We recommend that you change or repair the problem as soon as possible.
Some LCD displays may be flat at startup, which is usually caused by common VGA interface connection, it is mainly because the clock frequency of the LCD itself is difficult to keep of the clock frequency of the input analog signal, especially when the analog synchronous signal frequency is constantly changing, if a short circuit or poor contact occurs in the Synchronization Circuit of the LCD or the transmission line connected to the video card's synchronous signal at this time, and the following cannot be adjusted in time to maintain the necessary synchronization relationship, the problem of the screen.
2. Incorrect display resolution settings
Due to the difference in display principle, the screen resolution of a liquid crystal display is different from that of a common CRT display. Generally, the screen resolution is the best value. Traditional CRT Displays provide elasticity for supported resolutions, but LCD only supports the so-called "real resolution". The optimal image can be displayed only at the real resolution. When the resolution is set to a resolution other than the actual resolution, the screen display range is generally expanded or reduced, and the display effect remains unchanged. If the resolution is exceeded, the black screen is used for processing, which is uncomfortable. In addition, interpolation and other methods may be used to maintain full-screen display at any resolution, but the display effect will be compromised. In addition, the fl rate setting of the LCD is also related to the screen quality. You can set the appropriate fl rate based on the actual situation. Generally, it is best to set the fl rate to 60Hz.