电脑黑屏问题（Computer black screen problem）.docVIP

电脑黑屏问题（Computer black screen problem） Remember the black screen fault simple solution The notebook computer using LCD (Liquid Crystal Display) using the LCD screen and the desktop CRT (Cathode Ray Tube) CRT display screen compared with a qualitative difference, with low power consumption, small radiation, protect eyesight and so on merits, believe this point when friends early before buying a notebook computer to know. Notebook computer using LCD in general can be divided into TN, STN, DSTN, HPA, TFT, TN, STN in existing products are seldom used, we can see the basic is the use of DSTN, HPA and TFT models, in which TFT is the most common. The LCD screen is expensive, the cost usually accounts for the entire laptop computer cost 40%, is probably the most expensive part of the notebook computer, but also more fragile things. If used improperly, some unexpected problems can happen. After the notebook appears black screen fault, should first do the following inspection: 1. first eliminate the power adapter, using a multimeter to check whether the rated voltage, excluding adapter failure, and then use the computer CRT notebook display is connected to the external display interface, and then displays the status of switch to CRT mode, such as display all normal, in addition to basic on the motherboard and graphics card may be damaged. If it doesnt work properly, the motherboard or graphics card has a problem. You can change the motherboard or send it to the chip level JS for processing, but this kind of fault is very unusual. 2. excluding non motherboard, graphics card failure, is a common LCD screen fault. Then switch back to the LCD mode again, such as the faint display of something, indicating that the LCD screen and cable is not damaged, it may be the backlight is not lit. There are two reasons why backlight cant be lit: the backlight tube is burned out or the high-voltage circuit that drives the lamp is damaged. The working principle of the high voltage circuit board