Laptop LCD screen dark is described that you can only see vague image when adjust the maximum brightness, and the screen backlight does not shine, if not look closer, it would like a black screen. Indicator lights are lighting and flashing normal after boot, you can see the harddisk indicator is working, also can hear the voice into WINDOWS, if connect an external display to laptop. The images in external display is normal. This failure is called laptop screen dark failure, and it is the most common repair. Laptop screen turns red is also belongs to some class failures. Common causes and maintenance are as follows:

1: High voltage panel is damaged: High voltage panel is responsible for change DC voltage into 1000V high voltage which is light tube needs. Coil, the chip will be easier for aging or burning at high temperatures working for a long time. The solution is replacing, the effect of the original and alternate will be the same if not with the light.

2: The light tube problems. The light tube aging or short-circuit will cause the display dark, it is common for light aging. Generally because of the long-term use or collisions in the process of using(The light tube life is from 3-5 years if using normal). Sometimes the laptop LCD screen appears red when you booting, which is equivalent to warm, and it is not so obvious after into the new system. This process may continue for a long time before they are completely dark. Of course, there is no sign of screen become dark. Sometimes it is due to lamp connectors and cable short-circuit between the cold solder joint by ignition. You will see a small piece of black shadow in the screen corner after a good screen be held. The problems caused by light tube can be solved that only need to replace the lamp. That’s really a meticulous work requires a certain skill.

3: Screen cable problems. Screen cable break also a reason causes dark screen. Laptops are folding, the screen cable will wear when closing, and some design models used for a long time would give rise to breaking the screen.

4: Motherboard circuit failure. We talked about the the high voltage panel is responsible for power supply to screen backlight, and its supply is generated by the motherboard. Supply problems on the motherboard also caused dark screen failures. The reason is Lid switch damaged on the motherboard cause backlight are turned off. And there is a failure of opening the signal, it ia controlled by the graphics card, this is very rare.

Why LCD will become yellow or red?

Using LCD certain period of time, especially always adjust to the maximum brightness, screen aging itself and the lamp will be yellow. Cold boot screen is mainly red lamp aging, you can replace it.

What does Screen cable do?

In fact, A laptop LCD cable also known as video cable, display cable or screen cable. This cable transfers data signal from the motherboard and video card to the LCD screen. Also, most video cables supply high voltage DC power to the screen inverter.

Why are laptop screen bright colors looked nothing like the desktop computer?

If you are referring LCD comparison, then compare the two you will understand that laptop screen needs power-saving, lightweight, and reduce the thickness, so the majority of laptop computer screen is only a lamp, compact structure, while the desktop LCD monitors are not subject to power constraints, in the light and reduce the thickness requirements are much more lenient than the laptop computer screen, the desktop LCD can spend the root tube and more liberal use of the internal structure can be put down More reflective panels to enhance the contrast and color saturation, they are inherently in a different starting point on, so laptop LCD screen color can not compare to desktop is normal.

Why the screen flicker?

When the brightness down to a certain extent, many of the notebook screen flicker phenomenon occurs. Some graphics cards (such as some models of the ATI Mobility Radeon 7500 or 9000) will also start the power-saving feature automatically reduces the refresh rate causes the screen flicker. Of course, there may be due to problems with the screen’s own lamp caused this phenomenon, but this is relatively rare.

Whether it is necessary to affix LCD protective film?
It is not recommended to do so, because any protective film will lower the actual LCD display, especially in the clarity and sharpness has become more apparent protective film generally very difficult to get smooth paste without air bubbles, in addition to showing machine and the use of environment is very bad notebook computers, the LCD is not recommended to affix protective film.

LCD white screen, what is the reason?

This is generally due to the loose cable inside the LCD screen and motherboard, or caused by loose wiring, there are very few cases because the software (drivers and virus) causes, if it is in the boot immediately after the white screen black and white. Or self-test are generally the reasons for the hardware into the operating system after the black and white, usually causes the software.

What components are LCD screen contained?

In short, notebook computers LCD screen mainly include the LCD panel, TFT panel and backlight module board composition, and another drive TFT panels and lamp components. A fixed assembly of the metal frame of the screen, as well as the connections between the various components row lines.

Why color lines appears on the LCD screen?

This situation is divided into two kinds. If it is severe full color lines and each line is not through an entire screen, it is mostly caused due to graphics problems, such as memory overheating, or driver error, or if it is a Dorgan lines throughout the screen and the location of a fixed color unchanged, mostly due to LCD screen cable problems.