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Why is the black screen when the laptop is turned on? How to solve the problem of black screen on la

Sihai entertainment news: people may have a black screen when using a laptop. When this happens, what's the reason for this? How to repair it? The following is the reason why the laptop turns on black screen carefully organized by Xiaobian. Let's have a look. In fact, there is a kind of situation that we can easily ignore, that is, the lack of power.

≫ & gt; & gt; click on the next page to see why the laptop turns on black screen

Causes of black screen on laptop

1. Poor contact of display data line;

2. Poor contact of graphics card or;

3. Poor contact and overheating of CPU;

4. Poor contact of memory module;

5. The performance of power supply is poor;

6. The machine was infected with CIH virus and BIOS was destructively refreshed;

7. Microsoft black screen, please patch;

How to turn on the black screen of laptop

① First of all, check whether the power supply connected to the notebook is in good condition and whether the power indicator is on. If possible, friends suggest using a multimeter to test whether the notebook power supply has the voltage output with the value indicated in the power label. When there is a power output, connect the notebook, and then turn on, check whether the laptop power indicator is on.

If the power indicator light is on, there is wind at the cooling fan port, but the display screen is still black. This situation is mostly due to the internal circuit failure or hardware failure of the notebook, such as the internal memory module of the notebook is loose, the graphics card is faulty, and the display panel is faulty. At this time, it is recommended that you use the computer external display, that is, the monitor of the general desktop computer, and connect it to the external display interface of the notebook. If everything is normal, the possibility of damage to the motherboard and graphics card is basically ruled out. If not normal, the motherboard or graphics card has a problem. In addition, loose memory may also cause black screen startup, technical friends can take a look at the machine, do not understand the user recommended to take a professional repair shop repair or send to the warranty.

Other aspects, excluding non motherboard, graphics card fault, is the common LCD screen fault. If something is vaguely displayed, it means that the LCD screen and the cable are not damaged. It may be that the backlight is not on. There are two reasons why the backlight cannot be turned on: the backlight tube is burned or the high voltage circuit driving the lamp is damaged. The working principle of high-voltage circuit board is to change the low-voltage direct current provided by the main board into high-frequency high-voltage electricity through the switch circuit, and light the backlight tube. When you just press the power on button to start, you can put your ears on the screen frame and listen carefully. If there is a zippy sound, it will be silent. Generally speaking, it is the problem of high-voltage circuit board. If it is silent all the time, it may be the lamp tube problem. Although this kind of amateur judgment is not very professional, it is still more practical.

② The other case is that the laptop has no response and no indicator light is on by pressing the power on button on the notebook. Most of this is due to power supply line failure or power on button failure. General users suggest that they take it for maintenance. If possible, they can simply dismantle the machine and check it.

In fact, there is a kind of situation that we can easily ignore, that is, the power is insufficient. I once had a friend who bought a new computer, but the computer turned on black screen in one use. My friend rushed to find the editor and asked this. The author turned on the computer, and all the power and hard disk light indicators were normal, but the monitor was black screen. I asked if there was any contact recently Bumps or falls, the friend said that did not do anything, only last night in bed to watch a movie, the day is like this. The author plug in the power supply, boot normal, the results found that the notebook power supply due to the use of too long time, power shortage.