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.

The cost of High-resolution LCD screen is higher than the low-resolution LCD screen, but high-resolution notebook is not necessarily suitable for all types of users. If it is at the same price, you must be based on your individual application requirements as the sole judging criteria.

Here is a misunderstanding, that is confusing LCD and CRT monitors resolution, people hold the opinion that the laptop LCD screen resolution is adjustable. Such as laptop LCD screen with a resolution of 1920 × 1200, if they feel the font is too small in 1920 × 1200 display mode.Can resolve the small font problem by adjust to 1680 × 1050 or 1440 × 900? The actual situation shows that the resolution on the laptop LCD screen to make any changes will affect its display, there will be a small degree of burr light phenomenon, can also cause stretch.

How to solve the high-resolution LCD screen font smaller problem? There is another method that is to change the font in Display Properties WINDOWS option: click the right mouse button on no icon region of the desktop,then click the property,or click on control panel,then“Appearance Theme”, choose “display font size”. But in that case, it will erase the advantages of high-resolution LCD screen.

The main advantage ofthe high score screen is providing a natural field of vision and more work area, such as panoramic animation, sophisticated financial statements, cross-page file operations, the biggest advantage is that we can enable users to increase the working area, it could also show more of content, so users can simultaneously conduct a number of work without frequent switching. Encounter such trouble with this, it is better one-step selection of a LCD screen size and resolution are suitable for laptop.

Therefore, the proposals we give about laptop LCD screen resolution are:

1,For the need for greater perspective of users, as far as possible the selection of large-size notebook, but the larger resolution must be priority in the same size of the LCD screen.

2, For users who require larger fonts, select portable notebook while the size meet the requirements.But in the same resolution the smaller size of the LCD screen the more priority should be given, of course, you can also change the font size to make the font become bigger.

If your LCD screen has a stuck or dead pixel (a point on the screen that is always lit or always dark), it is usually due to a transistor malfunction or uneven distribution of liquid in the liquid crystal display (TFT LCD). This can often be fixed.

Steps：
Software Method

1. Try running pixel fixing software (see Sources and Citations). Stuck pixels can often be re-energized by rapidly turning them on and off. If this fails, complete the following steps.

Pressure Method

1. Turn off your computer’s monitor.
2. Get yourself a damp washcloth, so that you don’t scratch your screen.
3. Take a household pen, pencil, screwdriver, or some other sort of instrument with a focused, but relatively dull, point. A very good tool would be a PDA stylus.
4. Fold the washcloth to make sure you don’t accidentally puncture it and scratch the screen.
5. Apply pressure through the folded washcloth with the instrument to exactly where the stuck pixel is. Try not to put pressure anywhere else, as this may make more stuck pixels.
6. While applying pressure, turn on your computer and screen.
7. Remove pressure and the stuck pixel should be gone. This works as the liquid in the liquid crystal has not spread into each little pixel. This liquid is used with the backlight on your monitor, allowing different amounts of light through, which creates the different colors.

Tapping Method

1. Turn on the computer and LCD screen.
2. Display a black image, which will show the stuck pixel very clearly against the background. (It is very important that you are showing a black image and not just a blank signal, as you need the backlighting of the LCD to be illuminating the back of the panel).
3. Find a pen with a rounded end. A Sharpie marker with the cap on should be fine for this.
4. Use the rounded end of the pen to gently tap where the stuck pixel is – not too hard to start with, just enough to see a quick white glow under the point of contact. If you didn’t see a white glow, then you didn’t tap hard enough, so use just slightly more pressure this time.
5. Start tapping gently. Increase the pressure on the taps gradually for 5-10 taps until the pixel rights itself.
6. Display a white image (an empty text document is good for this) to verify that you haven’t accidentally caused more damage than you fixed.

Tips：

* If the pressure and tapping don’t work directly on the stuck pixel, start moving outward around the stuck pixel. If you see the pixel flicker while doing this then you know where you can focus the pressure and tapping techniques rather than directly on the pixel.
* Many people report success with this technique but these instructions won’t work in every case. It may take a few attempts to make sure you are pressing exactly on the stuck pixel.
* These instructions will fix “stuck” pixels, not “dead” ones. Dead pixels appear black while stuck pixels can be one constant color like red, blue or green.
* An alternative, but similar technique involves gently massaging the stuck pixel with a warm damp (not wet) soft cloth.
* Alternative technique to tapping: Using a rounded pencil eraser, push with moderate pressure into screen at stuck pixel.
* If these instructions don’t work, you can hopefully get the monitor replaced through your manufacturer. If your monitor falls under the specifications of replacement, get in contact with the manufacturer to set up replacement plans.

Warnings：
# Do not attempt to open the monitor as it will void the warranty and the manufacturer will not replace it.
# Make sure you don’t get any electrical equipment wet or it may break.
# Some people claim that touching the screen can cause more pixels to become stuck, although this has not been proven.
# LCD Displays are composed of multiple layers. Each layer is separated by very small glass spacers. These spacers and the individual layers are very delicate. Rubbing an LCD panel with a finger or even a cloth can cause the spacers to break and cause further issues beyond the original pixel fault. As such most repair technicians with service certifications are trained not to use the rub or tap methods – use them at your own risk.

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* Most LCD manufacturer warranties for LCD displays will cover replacement of the panel when the display reaches a certain number of pixel anomalies. These warranties however generally will not cover damage caused by rubbing the screen so use extreme caution and contact the manufacturer before proceeding to see if you qualify for repair or replacement.

Source from wikiHow.