Common troubleshooting problems of LCD
In the years of contacting computers, the author encountered many problems with the display. Some problems can be solved by themselves, while others can not be solved by ordinary DIY. Some of these display problems may have been encountered by everyone, but do not know how to solve them, so the following author will share this process with you.
One of the classic faults is the lack of color on display
Friends buy brand computers. They don't take long to buy computers, but there are problems with monitors. The original monitor has been working normally, but in the morning when the boot suddenly found that the color of the display is not normal, friends did not make any settings on the OSD menu.
The author turns on the computer and finds that the color of the display is really abnormal. It seems that the display lacks a color. According to the author's experience, this may be caused by the pin bending of the display joint. So I screwed down the display connector and found that one of the pins had been bent. After carefully correcting the curved pins with tweezers, the display color returns to normal.
Classical Failure II Display Geometric Distortion, Unadjustable
Friends buy brand machines only two days, but suddenly found that the display frame is not straight, the frame bending is more serious. After inquiring the after-sales service personnel, I learned that adjusting the OSD button can solve the problem. But I can't straighten it up after adjusting it many times! So let the author help to adjust. I think that this problem can be easily solved by my years of practical experience, but I didn't expect that after many adjustments, the problem is still the same. It seems that this may be the case when the monitor is out of the factory. It's impossible for a monitor to have no geometric distortion at all, but in most cases this distortion is not too serious. It's unexpected that this kind of misfortune has brought friends into contact.
The brands purchased by friends are very well known in China, but there are still such problems! So I accompanied my friend to the business to change a new monitor. Unexpectedly, the problem also exists in several new monitors. There was no way out. Finally, only one of them had a slightly better effect. Here's a reminder that when you buy a computer, you should pay attention to the problem of display distortion.
Trilateral Angle Bias of Classical Faults
The author's previous work is brand after-sales service. For a certain brand after-sales service period of time encountered many display corner bias, and is the same batch of displays. Most of these problematic displays have reddish or yellowish corners. Simple degaussing can not solve the problem, only sent to the manufacturer to repair. But there are also some products after a period of time, corner color can return to normal. Here the author reminds you to pay attention to whether the display color display is normal, especially the corner when buying the monitor.
Classical Failure 4 Display refresh rate set to 85Hz, still feel the screen flicker
Especially after installing XP* as the system, the situation is particularly obvious. Sometimes this problem can be solved after the driver is reinstalled, but it is not absolute! This may be due to the problem of display workmanship. So if you find this problem when you buy the monitor, you'd better replace the new monitor.
Fifth Classic Failure: Some areas of the display are slightly black or yellow
The author has seen many new monitors with such problems, some of which have abnormal color in the middle part, and some have dark color on the left side. This is different from the magnetization of the edges mentioned earlier by the author. It is related to the quality of the picture tube used in the display. It is also likely to be an old picture tube. We recommend that you try not to choose this kind of product.
Classic Failure No. 6 Display Focus is not clear and has double shadows
Displays with this problem can be found blurred when they are used. This kind of problem is usually caused by the internal circuit problems of the display, or it may be caused by the damp of the display. When people buy monitors, they must not choose such monitors. If you have such a problem with your monitor, it is recommended to send it to a professional maintenance department for repair.
Classic Failure Seventh Display Screen Jitter or Ripple
This kind of problem often occurs on the monitors which have been used for a long time. It is usually caused by the problem of filter capacitance, but it is not absolute (the author has encountered the situation of screen jitter caused by room reasons, but not in other rooms). If such a problem occurs, it is recommended to send it to a professional maintenance station for repair.
The eighth of classical faults is "excessive distance between points". There is a clear distance between pixels.
This situation mainly refers to those points whose distance is above 0.25mm, but the screen display can clearly see the point distance. Popularly speaking, it is just like looking at multiple points on this kind of display. It's important to know that most monitors have a dot distance of 0.25 mm, but this is not the case on many monitors. The author has encountered several such products, and the popularity of such products is relatively low. This situation is mostly due to the use of poor quality display tubes, the author suggests that we try not to choose such products. Ninth Classic Failure: Screen Graphics on Display Screen
I have encountered some monitors with this problem, and after changing their resolution, we can see that the reticulation changes. This is also due to the instability of the internal circuit. It is recommended that you do not choose this product as far as possible.
Classic Failure 10 Display has "Fire" Sound
This may be caused by humidity inside the monitor, or it may be caused by humidity inside the monitor.