Computer Black screen Solution reference scheme

We often encounter computer black screen in work, study or game, make life annoying, but want to solve the problem must find out the reason, for this reason, computer theme House (www.51ztzj.com) summed up a few reasons for everyone's reference.

One, the computer host failure caused by black screen failure:

1. The fault caused by the power supply of the host

The failure of the host power supply or the poor quality of the host power supply is common. For example, when you add a few new devices, the display has a black screen failure, excluding the quality of accessories and compatibility problems after the power quality is not good power is the main cause of the failure, at this time you may also hear the loudspeaker continuous alarm 12 sound, the replacement of high-power high quality power supply is the best way to solve this type of failure. In addition, some motherboards have AT/ATX dual power connectors, the choice of jumper settings can also cause this type of failure.

2. Parts quality caused by the fault

The poor quality or damage of the computer accessories is the main cause of the failure of the monitor black screen. For example, the motherboard (and the BIOS of the motherboard), memory, display cards and so on problems can certainly cause the appearance of black screen failure. Its fault performance such as the display lamp is orange, then replace with the replacement of the display card, memory, and even the motherboard, the CPU to try, is the quickest solution.

3. The connection quality between the fittings

Memory graphics card and so on and the motherboard between the incorrect or loose contact is caused by bad contacts is the main cause of black screen failure. Also, a problem with a display card and a monitor connection may cause this type of failure until the at Power connector is incorrect and even if your hard drive or optical drive data cable is reversed, it may cause a startup black screen failure.

4. Overclocking caused by the black screen fault

The excessive overclocking or the overclocking of the parts will not only cause the black screen fault, serious damage will also cause accessories. There is excessive overclocking or to be not suitable for overclocking parts overclocking after the heat dissipation or normal use of the cooling fan damage, simply do not turn, etc. will cause the system to protect itself from the black screen.

5. Black screen caused by other reasons

Other such as the motherboard CMOS settings are not correct and motherboard removal of the BIOS jumper incorrectly can cause a black screen failure, then you can change its settings against the motherboard instructions. In addition, software conflicts such as improper installation of the driver, DIY improper, such as the BIOS refresh error, power management settings are incorrect, malicious virus caused by hardware damage (such as CIH) and so on are likely to cause the appearance of black screen display. In the face of this type of failure may wish to think more carefully think about the cause of the fault, to solve the problem with less effort.

Second, the monitor itself caused by the failure of the black screen

According to the author's usual experience, the monitor itself caused by the failure of the black screen is mainly caused by the following reasons:

1. Power shortage of AC power supply

The external power supply is not enough, causing some old display or some power-consuming monitor can not start normally, it is one of the reasons of black screen fault caused by the monitor's own fault. or external power supply voltage instability, too low can cause the monitor does not work.

2. Power switch Circuit damage

The failure of the display switch circuit is the main cause of the failure of the monitor's black screen. Simple, such as power switch damage or internal short-circuit, common such as the failure of the switch tube or its peripheral circuit components appear damaged and so on.

3. Damage of line output circuit

The failure of the line output circuit or the CRT and its power supply circuit is also the main cause of the failure of the display black screen. In particular, the damage of high-pressure packs in some of the use of many years or inferior quality of the display of a black screen caused by the failure is more common.

Three, the monitor black screen fault solution idea

For the monitor black screen fault how to repair, below we will put forward some ideas for your reference.

First of all, the computer host failure caused by the black screen of the display of the problem we can from the following ideas to solve:

1. Check the installation quality of accessories

When you are assembling a computer or replacement parts of a black screen failure, you should first check the installation quality of your accessories. For example, if the memory bar is properly installed and is in good contact with the motherboard slot, display cards, such as card is installed in place, the relevant settings in the BIOS and the motherboard on the correct selection of jumpers, you can carefully refer to the relevant Board card instructions to set up, another key to check the quality of the board itself and the motherboard on the relevant slots and cards on the It is also necessary to have a foreign body in the gold finger and be polluted by grime.

In addition to whether the CPU is overclocking use or be "mistakenly" overclocking use (especially for some soft jumper motherboard, the system "automatic" error setting is more likely to cause this kind of failure), hard disk or optical drive data cable is connected and so you need to consider. And for such problems, it is best to use the "minimum system method" and "replacement method" for the diagnosis, the host will only leave the motherboard, graphics, memory, CPU to try, especially the quality of the memory bar caused by such a relatively high rate of failure, if no problem, you can focus on the quality of other accessories, such as still black screen, Can focus on these parts and then carefully installed after the connection restart to try, such as can not solve the problem, the relevant parts can be replaced by the good or bad test parts.

In addition, it is important that you also need to understand the host power and power switch and the connection is normal or not, they may cause the whole machine black screen, you need to focus on understanding. If there is a problem with the power supply, then you open the computer after the visible host chassis panel LED is not lit, and can not hear the host power supply fan rotation and hard drive self-test, etc., it shows that your host system does not have a normal power supply. This type of problem you should first check whether there is an external AC power, use pencil to see if there is power on the outlet. The next step is to determine if the power cord is connected to the power supply on the side of the host if necessary, use a multimeter to test whether the voltage is sufficient, the voltage is too high or too low can cause the host power supply overvoltage or undervoltage circuit of the automatic stop protection, if the above is no problem, then you should focus on the maintenance of the main internal and power switch and reset key, Also adopt the minimum system method and the replacement method, each unplug the main engine card and other equipment power cord, signal line, and then power test machine, such as the removal of a device when the host power to restore work, it is just pulled out of the equipment damaged or improperly installed lead to short circuit, so that the power supply short-circuit protection circuit to start, stop on the machine power supply, Then you can focus on its contact, if necessary, replace and try again, and also focus on the power switch and reset key quality and their connection with the motherboard is correct or not is important, Because many inferior chassis of the power switch and reset keys often occur after the use of its internal metal contact sheet fracture and a power supply short-circuit, resulting in a complete machine black screen without any display. If the above check does not solve the problem, then please replace the power supply to try.

2. Listen to the sound of color discrimination fault

The computer appears black screen fault more when performance in the boot after the host panel indicator light, fan normal rotation, but the PC horn alarm sound; or internal chassis such as hard disk and other related equipment normal self-test, but the monitor does not display. At this time in addition to the above methods of maintenance, more important is to learn to debate the error of PC speakers to identify the fault, in addition to observe the failure of the host or monitor the various indicators of the flash situation to judge The fault is also very good.

For example, the host normal self-test, but the monitor appears "black screen" failure, for this failure we can focus on the motherboard-display card-monitor cable-monitor this idea to consider. First check the monitor power LED is lit, such as normal, you can focus on adjusting the brightness, contrast button, excluding the "common" such false black screen failure. If there is no problem, then you can focus on checking the host display card to the monitor connection cable whether there is a problem and cable on the plug in the needle is a skew fracture and whether it is connected with the display card tightly, in addition, the cable connector can be removed to see if the monitor can be properly lit or connect the monitor to other hosts to try, In order to determine whether the fault is from the host or the monitor itself caused.

Again such as, the monitor black screen and the host speaker emits a long, two or three short beeps or a continuous beep sound, indicates that there is a problem with the connection between the display card and the motherboard, or the connection between the display card and the monitor is problematic, you can focus on checking its slot contact whether there is a good groove in the slot is a foreign body and can be replaced by the display cards to try, if no improvement, Can initially indicate the problem on the motherboard, you can take the video card to the other motherboard to try. Another example, the emergence of continuous long sound, most of which indicates that there is a problem with memory, can focus on the memory and memory slot installation contact. If the machine emits a tick-tock continuous short sound, it indicates that there is a slight short-circuit in the machine, the minimum system method and the elimination method to solve the problem, until the location of the short circuit found. In addition, if you hear the two short beeps, it indicates that the motherboard or display card or monitor may be a problem, do not connect the monitor if it is still so chirping, the display card site problems, such as a short sound, it indicates that there is a problem with the display.

For the display itself caused by the black screen fault, we mainly from the following points for you to provide more specific maintenance ideas.

1. Monitor black screen for fast maintenance

If there is no display after the monitor boot, excluding the reasons for the host, you can first check if the voltage is too high or too low caused the display protection circuit work, you can check its accelerator voltage is normal. In addition, the key is to check the following problems prone components, such as to see if fuses fuse, rectifier bridge switch tube has been penetrated, the current limiting protection resistors are burned, and so on, these parts sometimes from the appearance can be seen on the phenomenon of burning black. Then the focus of the inspection line output tube, transformers, Low-frequency rectifier, high-frequency rectifier pipe, such as whether there is damage or performance degradation or virtual welding, and so on, the general display of black screen failure You can start quickly Handers.

2. Fault judgment of line scan circuit

The failure of a row scan circuit is an important reason for the absence of a raster screen after the display is added. For this type of failure, you can focus on the maintenance of the line scanning circuit, you can first check whether there are problems in the oscillating circuit, in the amateur conditions in addition to check the line oscillating chip peripheral components are damaged, but also first to replace the oscillating chip to try, the other line to promote the damage of the tube or its work is not normal The failure of the row output tube or the row output load may cause the above fault, and you may try to repair and replace the parts. and the line output circuit if there are problems through this overhaul and replacement is generally very normal.

3. Picture tube and its power supply circuit fault judgment

CRT and its power supply circuit is not normal can also cause the monitor to add electricity without grating black screen fault. At this time we can first check the tube filament is bright, using the meter to measure the filament power supply circuit to see if the filament voltage is normal. In addition, if it is found that the filament electrical block need to replace the best filament current limiting resistor can be found, if the tube filament broken, you need to replace the picture tube. If the above normal, we can focus on the tube to check the acceleration of the voltage is normal, especially the acceleration of the pole voltage connection is caused by this type of failure of the main cause, replacement can be. If there is high pressure, we can focus on the replacement of line output transformers (high-pressure package) to try, this part of the damage is caused by a black screen monitor failure of one of the main reasons. In addition to the above maintenance at the same time we can also check the cathode voltage and visual discharge voltage is normal, if the visual discharge voltage is not added or its voltage is not normal is also caused by the display of electricity without grating and black screen is one of the important reasons.

The computer Theme House (www.51ztzj.com) reminds you that you can only drug by a disease. Charm. Good luck.