How to repair the black screen of the display caused by the graphics card

Graphics card failure is a common problem in the process of computer use. Generally speaking, the failure of graphics card will be accompanied by other problems such as black screen, which also brings trouble to our maintenance. As soon as a black screen appears, most friends may be at a loss. Is there no better solution than moving the computer to the computer city for maintenance? In fact, many graphics card glitches can be solved by ourselves. According to the author's many years of experience in using computers, the main types of graphics card failures are as follows. Please prescribe the right medicine according to the specific situation of your strike graphics card!

First, poor contact

Poor contact of the graphics card is one of the reasons why the graphics card can't work stably. There may be four reasons for poor contact. First, the AGP slot material of many low-priced motherboards is not very good. The AGP slot can't be in close contact with the PCB of the graphics card, and some motherboards also omit the clips of the AGP slot, which makes our graphics card have loose space in the slot. Secondly, in the process of installing the graphics card, the gap of the rear baffle of some inferior chassis can not be aligned with the AGP slot of the motherboard. After forcibly tightening the screws of the graphics card, the PCB of the graphics card may be deformed after a period of time, which is another reason for the poor contact between the AGP graphics card and the slot. There is also the problem of the graphics card' Golden Finger' that we usually talk about. The electroplated metal on the gold finger of many inferior graphics cards is not thick enough. After plugging and unplugging the graphics card for many times, the electroplated metal has fallen off, causing the gold finger of the graphics card to oxidize in the humid air. The last case is that there is dust around the AGP slot, which leads to problems in the contact between the gold finger of the graphics card and the motherboard. With the emergence of high-power video card fans, this problem appears more and more frequently.

Gold finger oxidation display card

Many fans around the graphics card make it easy for dust to gather near the AGP slot.

Solution: For the graphics card with poor contact, if it is found that the graphics card is not compatible with the chassis size, just try to loosen the screws of the graphics card. If you are worried that the computer will encounter problems when using it, you can use wide tape to fix the border of the graphics card in place. If you are not at ease, put the chassis on both sides of the graphics card and sandwich the border of the graphics card in the middle. If the gold finger of your graphics card encounters an oxidation problem, it may be very troublesome to solve it. First of all, you should use an eraser to remove the rust spots on your golden fingers. You are lucky if your graphics card can still work normally after it is removed. If the graphics card doesn't work properly, we need to clean the golden finger with rust remover, and then gently coat a layer of solder on the golden finger to increase the thickness of the golden finger. Be careful not to short-circuit between adjacent gold fingers.

Tinned gold finger

Second, the power supply problem.

Similar to the problems encountered in upgrading CPU. The circuit designed at the beginning often can't meet the power supply requirements of the later hardware equipment. With the rapid increase of power consumption of graphics cards, it is always possible to encounter the problem of insufficient AGP power supply when upgrading graphics cards, especially in hot summer, the huge power consumption of GPU will be a severe test for the power supply of the host and the power supply circuit of the motherboard. If you often encounter the problem of black screen when running large 3D games, and you have just upgraded the graphics card, I suggest it is necessary to check the power supply of the host and motherboard. If your graphics card runs well in winter, but it is unstable in summer, besides checking the heat dissipation of the graphics card itself, you should also pay attention to the power supply, because in hot summer, the switching power supply and the MOS tube of the motherboard work much harder than in winter.

Solution: If the graphics card can't work normally due to insufficient AGP power supply, we can turn off the AGP acceleration function in CMOS settings and let our graphics card be used as an ordinary graphics card without AGP acceleration function. If you think the performance loss is relatively large, we still have a compromise, that is, we can reduce the acceleration speed of AGP bus by one level. For example, AGP4X can make it run in AGP2X. Compared with the higher AGP bus speed, the lower AGP bus speed can greatly improve the stability of the system. If the motherboard you bought can adjust the AGP voltage, congratulations. Maybe you can increase the AGP voltage to meet the high power demand of the graphics card. Generally speaking, increasing AGP voltage by 0. 1~0.2V will not cause any harm to hardware, but the power supply of AGP is much more stable than before. Finally, we can also listen to the suggestions of motherboard manufacturers, make a customer service call or go to the forum of the manufacturer's website, which may be more exciting. A friend of the author once encountered the problem of insufficient power supply for graphics cards. The motherboard he used was a product of a well-known manufacturer a year and a half ago. After using various' soft' methods, the manufacturer's engineers proposed to mail the motherboard back to the factory, and the engineers helped to modify the circuit to enhance the power supply capacity of AGP. Whether such a' good thing' can happen to everyone depends on your luck.

Third, the CMOS setting is unreasonable.

No product in the world is perfect, and so are hardware products. The development speed of graphics card is so fast that many new features and functions can't be perfectly supported by our hardware system, which also directly affects the stability of our computer. The original intention of sideband addressing function is to increase the bandwidth of display subsystem by using idle bus bandwidth, but VIA is not the founder of AGP standard after all, so the support of sideband addressing function is not perfect for most VIA graphics cards. Many motherboard manufacturers have turned off this function in the factory default settings for stability. If you turn on sideband addressing in CMOS settings of VIA system, nine times out of ten it is the culprit that affects the stability of your computer.

Then there is a project called video closing method in the ACPI advanced power management system of the motherboard, and we use it to set the closing mode of the display. Unfortunately, many motherboards have limited support for new graphics cards, so it is often difficult to wake up the black screen after the monitor enters the sleep state.

The black screen setting of COMS may make your monitor unable to wake up.

Solution: Turn off the problematic option in CMOS settings. If you are not afraid of trouble, you can brush the BIOS to the latest version, which can solve many compatibility problems.

Four, hidden dangers on the VGA plug

The VGA plug on the graphics card may loosen the reed in the pinhole after being plugged and unplugged for many times, making it unable to make good contact with the signal wire male of the display; There is also the violent pulling of the monitor signal line, which may also lead to the signal transmission problem of VGA plug. For the common VGA plug with 15 pin, pins 1, 2 and 3 correspond to red, green and blue signals respectively, and the normal voltage fluctuation range is 0.03 V ~ 0.06 V; Pins 13 and 14 correspond to the line scanning signal and the field scanning signal of the display respectively. For the line scanning output signal, the voltage should be 3V~5V during normal operation, and the field scanning signal should not be higher than1v.. If the display screen is black after violent operation on the VGA plug, and the pin output voltage of the VGA plug is abnormal after measurement, it can basically be concluded that there is something wrong with the VGA plug.

We just need to check the pins of a few VGA plugs that are useful to us.

Solution: When the reed inside the VGA plug is loose, solder can be used to thicken the pin on the male head of the display signal line, so that the loose reed can contact the display signal line again. For the faulty VGA pin, you can find the corresponding solder joint on the PCB along the VGA plug, find the open circuit and repair the solder again.

Verb (abbreviation for verb) Failure caused by BIOS refresh and driver change.

Once upon a time, there was a craze for BIOS to replace graphics cards in DIY community. Many people hope to improve the performance of graphics cards by brushing BIOS files of well-known brands into their own graphics cards. This may be effective, but in essence, the hardware performance improvement brought by using BIOS files of famous brand graphics cards is only caused by resetting the frequency and delay of video memory in BIOS files. Most mainstream graphics card BIOS files are quite perfect, and it is impossible to achieve a huge improvement in performance by changing BIOS files. Compared with the slight improvement in hardware performance, we may lose more in stability. Even for the same model of graphics cards from the same manufacturer, the BIOS files are different. The manufacturer will modify the BIOS files according to the specific conditions of these graphics cards to enhance the stability of the products. However, there is no' blood relationship' between our graphics cards and brand-name graphics cards, and it is normal that there will be stability problems after using someone else's BIOS. If after updating the graphics card BIOS, there are often black screens, automatic exit in the game or regular stripes on the screen, then there is probably something wrong with your BIOS.

Solution: Just brush back the original graphics card BIOS file. Unless you really need to refresh the BIOS file of the graphics card to solve the compatibility problem, try to let the graphics card use the original BIOS. After all, brushing BIOS is a troublesome thing. For mainstream graphics cards, refreshing BIOS files will not improve performance, otherwise there will be an overwhelming number of articles on the selection of high-performance graphics cards on the network, in addition to talking about the core frequency and memory frequency of graphics cards, as well as the BIOS version number of graphics cards.

The above are some tips for dealing with simple graphics card failures. I'm sure you can say loudly after' studying' this article:' Let the black screen disappear!' Of course, if you encounter serious problems, such as burnt smell on the graphics card chip, or' beer belly' on the capacitor on the PCB, you'd better go to the maintenance point of the graphics card quickly, because this is no longer a common problem of the graphics card. If you insist on doing it yourself, then I suggest you get an article' Let the black screen go away! -Analysis of Unusual Faults of Graphics Cards' Read this article before you start working.

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