How do I Repair a Laptop LCD?

The bad point of the LCD screen is also called dot absence. It refers to the sub-pixel points displayed by the LCD screen in black and white and the three primary colors of red, green, and blue. Each point refers to a sub-pixel. LCD screens are most afraid of dead pixels. Once a bad point appears, a point on the display will always show the same color regardless of the image displayed on the display. This "bad spot" cannot be repaired, and the problem can only be solved by replacing the entire display. The dead pixels can be roughly divided into two types. The dark dead pixels are "black dots" that cannot display the content no matter how the screen display content changes, and the most annoying is the bright spots that always exist as long as the power is on. If it is caused by technical factors, it is not repairable. But if it is caused by keeping a static picture for a long time, it may be removed by software repair or wiping.

Dead pixels

(Bad spot of LCD screen)

The bad point of the LCD screen is also called dot absence. It refers to the sub-pixel points displayed by the LCD screen in black and white and the three primary colors of red, green, and blue. Each point refers to a sub-pixel. LCD screens are most afraid of dead pixels. Once a bad point appears, a point on the display will always show the same color regardless of the image displayed on the display. This "bad spot" cannot be repaired, and the problem can only be solved by replacing the entire display. The dead pixels can be roughly divided into two types. The dark dead pixels are "black dots" that cannot display the content no matter how the screen display content changes, and the most annoying is the bright spots that always exist as long as the power is on. If it is caused by technical factors, it is not repairable. But if it is caused by keeping a static picture for a long time, it may be removed by software repair or wiping.

Chinese name

Dead pixels

Foreign name

defective pixel

Category

Technology

nickname

Point absence

The LCD screen of the notebook is composed of two glass plates, about 1 mm thick, with crystal droplets about 5 microns (1/1000 mm) thick in the middle. They are evenly spaced and contained in a small cell structure. Three cells make up one pixel on the screen. Under the magnifying glass, a square shape appears, and one pixel is a light spot. Each light spot has an independent transistor to control the strength of its current. If the transistor at this point is broken, it will cause the light spot to be lit or not lit forever. This is the aforementioned bright spot or

According to the industry's default standards, "bad spots" are a "normal" phenomenon, but don't overdo it. A certain number of bright or dark spots on the screen panel

Dead point test method

Is "Bad Spot" Really Inevitable? With the intensification of competition and the improvement of technological processes, LCD screen manufacturers have increased raw material standards, strengthened internal quality control such as production and inspection, and greatly reduced their frequency of occurrence. The method of checking for dead pixels is quite simple. As long as you adjust the brightness and contrast of the LCD screen to the maximum (to display a reversed picture) or to the minimum (to display a completely black picture), you may find that there are many bright spots on the screen Dark spots exist. Liquid crystal display manufacturers generally interpret this as long as the number and distribution of dead pixels does not exceed a certain standard, the occurrence of one or more liquid crystal displays is normal and meets industry standards. Of course, with regard to the testing of dead pixels, some friends use software testing, which seems to be a little more professional, and it can make the dead pixels "nowhere to hide"!

It is particularly important to distinguish between "bright spots" and "bad spots". The absence of bright spots does not mean that there are no dead spots! Many manufacturers will recycle some panels with obvious bright and dark points into less obvious gray points. Of course, that pixel is still dead, but it does not look obvious. Some friends bought the book, and after the merchant took out the machine, they asked the merchant, "Is there a bad point in this machine?" The merchant replied, "Look at it! It's easy." Help me ... "I haven't even seen a bad spot, and I already know not to damage the machine! Joke, will JS (trespassers) help you?

For consumers who are not very knowledgeable about computer hardware, you can use the display dead pixel test software to test whether there are dead pixels in the computer display. These software with related functions are Nokia Monitor Test, DisplayX, Monitors Matter CheckScreen and so on. This kind of software is relatively easy to operate. Generally, the existence of bad pixels is "highlighted" through solid-color pictures such as red, blue, green, and black. If during the test, the observation screen is not different from the solid color screen, it can be considered that there are no dead pixels.

Dead pixel test software

DisplayX

DisplayX is a display software with a size of only 48KB. There is no need to install it. You can run the main program after decompression. Click "General Full Test" to complete all tests, including interlace, solid color, color, convergence, geometry, breathing effect, 256-level gray, gray, contrast and other test items. Right-click the mouse or press the Esc key to exit. For the bad point test, just select the "Pure Color" mode under the "General Single Test" menu, and click on the mouse to enter different solid colors such as all black, all red, all green, all white, and all blue, which is very convenient. Find dead, bright and dark dots on the LCD screen.

PassMark MonitorTest

PassMark MonitorTest is a performance testing software designed to test the effectiveness of your computer screen. It provides 25 different test items. You can test your computer screen according to different screen resolution settings and adjustments. Of course, it also includes testable LCD flat panel screens. The test can detect the LCD's various parameters, such as the color, response time, text display effect, the presence of dead pixels, the degree of video noise, and the adjustment complexity. Want to know if your computer screen is normal and display effect, you can try this software.

Monitors Matter CheckScreen

In addition to testing CRT monitors, Monitors Matter CheckScreen is also a more convenient test software for LCD monitors. It includes a number of tests that can well detect the color, response time, text display effect of LCD monitors, whether there are dead pixels, and videos. Various parameters of the LCD, such as the level of noise and adjustment complexity.

Select "LCD Display" to check parameters such as color, response time, text display effect, dead pixels, etc. There are 5 test items in total here. Click directly to start the test, and press the right mouse button or ESC key to return to the main interface. Among them, the Colour option (color, using three primary colors and 16.7 million kinds of color gradation screens to examine the expressive power, color uniformity, color gradation expressiveness, brightness, contrast) of the primary color, Crosstalk (sharpness detection to compare extremely strong black and white The interlaced picture detects the sharpness of the edge of the LCD color and the phenomenon of crosstalk), Smearing (response time detection), and Pixel Check (pixel detection, that is, the detection of dead and bright points). ^[1]

Visual impact

If your "book" LCD screen really shows the "bad points" in the "legend", and there are particularly many bad points, during the warranty period, we must first negotiate with the dealer according to some industry standards. If you The book has passed the warranty period, or a second-hand "book" has been purchased, and there are not many "bad pixels" on the LCD screen, or the location of the dead pixels is on the edge of the screen, only one, two, or two The words three and three have a small impact on our vision. It is impossible to change an LCD screen, and maintenance is equal to "whimsical", and it is only left to it.

In fact, instead of looking for a machine with no dead pixels, it is better to find a screen with better brightness, color, viewing angle, and response speed. This is the really important thing. One or two bad points are acceptable as long as they can be tolerated.

use correctly

There are many articles about the maintenance and repair of LCD monitors, and I will not repeat them here, just to remind the owners of books that when using a notebook, you must avoid long-time boot work, not to mention long Time displays the same picture, which makes it easier to accelerate the aging of the LCD screen and promote the formation of dead pixels.

In daily use, it is best to avoid pointing at the screen. Do not wipe the screen with corrosive liquids. Do not place heavy objects on the bag containing the notebook. Do not pat the screen with force. When wiping with water, wipe the cloth as dry as possible. .

I often heard that when many friends bought books, they had to choose from a lot of choices, and they couldn't hold a grain of sand in their eyes. As for the bad spots, they were even more concerned. They would never allow their own books to have a bad spot. I'm too lazy to maintain it, and I'm too lazy to wipe the screen with dust and saliva. I don't know that improper use will also cause the LCD screen to be damaged.