Troubleshoot common problems with CRT monitors

For computer users, the closest thing is the display, it can be said that it is an integral part of the computer system. At present, we commonly used CRT monitors, and CRT monitors are also very prone to failure, so how can you check and troubleshoot these failures?

The following for you to introduce some of the common troubleshooting, hope to be able to use a good computer to help.

　　Q: How to troubleshoot a black screen failure?

A: The computer monitor appears black screen is the user in the use of the computer often encountered problems. In fact, as long as the computer hardware in the motherboard, CPU, memory, display card, such as several major components have a certain understanding, the failure of the simple components of the damage can be completely done with their own hands out. In this case, you can follow the following maintenance steps and methods for analysis and simple maintenance:

1. Check to see if the power supply is working and the power supply fan is spinning? Hand to the main chassis back of the switch power supply outlet, feel the wind blowing out the normal power supply, no wind is a power failure: the host power switch on the instant keyboard three lights (NumLock, CapsLock, ScrollLock) Do you want to shine? Yes, the power supply is normal; the power supply light on the host panel, the hard drive light is on, then it is OK. Because the power supply is not normal or the motherboard is not powered on, the monitor does not receive a data signal and is clearly not displayed.

2. Check if the monitor is powered up; is the power switch on the monitor turned on? Does the monitor's brightness potentiometer turn off to the minimum? is the monitor's high-voltage circuit normal? Move to the monitor screen with your hands whether there is a "hissing" sound, the back of the hand hair is erected?

3. Check the display card and monitor signal line contact is good.

Can unplug the plug to check, D-shaped socket is bent, broken needle, there is a lot of dirt, this is a lot of users often encounter problems. In connection with the D-shaped socket, due to uneven force, or forget to tighten the socket fixing screws, so that the socket contact is bad, or due to improper installation method of the Ambassador D-shaped socket pin or bent, so that contact bad.

4. Open the chassis to check that the card is properly installed and that the motherboard slots are in good contact.

Does the display card or slot have too much dust to use for too long time? So as to cause poor contact, the chip on the display card has traces of burnt, cracked, and a short, four-length "beep beep" on the computer post when the display card is causing the black screen.

When installing the display card, you should hold the upper part of the display card by hand and insert evenly into the groove, so that the fixed screw mouth of the display card matches the screw mouth of the main engine box, do not insert without forcibly fixing, lest cause the graphics card distortion. If you confirm the installation is correct, you can remove the display card by rubbing the pins with an alcohol sponge or by switching to a slot for installation. If not, change a good video card to try it.

5. Check the other board card (including sound card, decompression card, video capture card) and the motherboard slot contact is good.

Pay attention to check the hard drive data cable, power cord connection is correct? Replace other card slots and clean pins. This is a point that many people tend to overlook easily. It is generally believed that the computer black screen is part of the problem of the monitor, unrelated to other devices. In fact, because the sound card and other equipment installation is not correct, resulting in the system initialization difficult to complete, especially the hard disk data line, power line plug wrong, but also easy to cause the failure of the display.

6. Check the memory bar and the motherboard contact is good, the quality of the memory is perfect.

Reseat the memory strips once, or replace the new memory strips. If there is a problem with the memory bar, the computer will start with a continuous tone "beep" sound

7. Check the CPU and motherboard contact is good.

Due to moving or other factors, so that the CPU and socket contact bad. Use your hand to click the CPU or remove the CPU reinstall. As the CPU is the main engine of the heat, socket type 7 may cause the motherboard to bend, deformation, can be in the CPU socket motherboard Bottom cushion flat motherboard.

8. Check the motherboard bus frequency, system frequency, DIMM jumpers are correct.

Control the motherboard manual, check each jumper, order for "system frequency jump CPU frequency jumper--dimm frequencies jumper", set CPU voltage jumper should be careful, should not set too high. This step is useful for some assemblers or users who like to overclocking.

9. Check the parameter settings to check whether the CMOS parameter settings are correct and the system software is set correctly. Check that the video card is in good compatibility with the motherboard. It's best to check the data for setting up.

10. Check whether environmental factors are normal.

Whether the voltage is not stable, or too high temperature, in addition to the above steps to check, can also be based on the work of the computer to quickly locate, such as in the host power, you can hear the computer self-test completed, if the hard drive lights flashing, should be in the second step to the fourth step check.

The above inspection method is based on the monitor itself without electrical failure, that is, the power led on the monitor does not light up when the host power is turned on. If the above steps are checked one by one, the monitor is still not displayed, it is likely to be a circuit failure, should be asked to repair professional.

Q: How to solve the ambiguity after the display is turned on for several minutes?

A: This situation may be the tube tail of the socket damp or dust pollution, may also be its picture tube aging (using a long time after the problem) caused by the specific circumstances, "the right remedy." For the situation is damp or contaminated by dust, if not very serious, the use of alcohol to clean the end of the tube socket can be resolved.

If the situation is serious, you need to replace the tube tail socket, you can go to professional television repair department to solve. For the picture tube aging situation, can only replace the picture tube can completely solve the problem. If it is still under warranty, it is best to find the seller (or manufacturer) to solve.

In addition, there is another reason is that the display of the relevant circuit of the electrolytic capacitor itself is poor quality can also lead to this failure, but this situation in the current well-known brand display is unlikely to appear.

Q: Wet weather using the display display brightness is not normal how to solve?

A: This is due to the internal display of damp and dust pollution leakage phenomenon. Most of the leakage of the site is concentrated in the end of the tube or high-pressure parts, especially high voltage output (line output transformer and line output transistor around). Usually working in dry weather monitor, in humid weather will produce leakage, if it is the southern Meiyu season is more so, these are caused by abnormal screen brightness is an important reason.

If the component quality is not a problem, this anomaly will only be maintained for a period of time, generally in 20 minutes or so will be able to return to normal, because as the display temperature increases, humidity, leakage also decreases, so the brightness will gradually return to normal state. Encountered this situation should be resolved as soon as possible, or because of leakage caused by local circuit short-circuit, and finally led to the display peripheral high-voltage circuit part of the damage.

Eliminate leakage fault is not complicated, first the display shell open, check the display internal components, circuit board whether there is "mildew" (this is the main cause of leakage), once found should find ways to give clearance. In addition, the brush to remove all the internal components accumulated dust, because the dust is also caused by leakage of the cause. Most of the problems can be solved by using the above methods.

　　Q: How does the monitor produce color spots to solve?

A: The display color spots (for short, color spots) are mainly subject to magnetic interference, which is usually said to be magnetized. The solution is, first of all should check whether the display with magnetic items, such as radios, televisions, mobile phones, speakers (especially the use of high-power external magnetic speakers), etc., should be away from the display of these items.

In addition, pay attention to the power cord around the monitor, data cable, etc., because these will produce a magnetic field, when passing the monitor near the monitor will have some adverse effects.

The solution is to first move the display position and change the direction of placement, as far as possible away from these wires: the second should use the display with the degaussing function for degaussing, as long as the problem is not too serious generally can be resolved. If through the above efforts color spots still exist, then only find vendors or vendors to help solve.

　　Q: Why does the display flicker?

A: There are two types of flicker in the display, one is just the edge flashing, the other is the entire screen flashing. The former is due to the monitor's own fault or display card driver, such a failure can connect the monitor to other computers for testing, you can make a clear judgment. If your system does not recognize the monitor type correctly in Windows 9X, you can change the type of monitor within the Control Panel---display---settings---advanced---monitor.

For a bug in the display card driver, you can download a new version of the driver to resolve it. The latter may be the electrical outlet and indoor fluorescent lamp, fan, Zuheyinxiang and other appliances caused by interference. Workaround, you can keep the monitor away from the source of the interference or increase the display's refresh frequency to minimize flicker.

Q: How to prevent screen protection after the "panic" phenomenon?

A: Under normal circumstances, screen protection after the "panic" phenomenon and the screen saver itself is irrelevant. The problem is whether the power saving settings are turned on while you go to screen protection. Energy-saving settings allow the software to turn off the monitor (monitor), the system is in hibernation, and the "panic" occurs after the system has entered hibernation.

The phenomenon is divided into two categories:

One is a false "crash" phenomenon, the performance of when through the mouse, the keyboard will wake up the system, the hard disk, the monitor began to start, the START process should need a certain waiting time, for the impatient user in a few seconds did not see the system recovery, they mistakenly thought that there was a "panic", in fact, as long as the patience and so on will be restored, There is no need to solve:

The other is the real "panic" phenomenon, mainly because of power management conflict, the motherboard in the CMOS Management Setup can control system hibernation from the hardware, but because Windows controls hibernation from the software, This results in a conflict between the power management mode of the hardware and software. The elimination method is to go into the CMOS to shut down all energy controls and use Windows for power management.