Juicio de problemas comunes de LCD:
1. The whole monitor has no power failure: the analysis of this failure is fairly simple. For LCD screens, there are generally two power sources, internal and external. The external power supply is more common. But no matter what type of power supply, its structure is much simpler than that of CRT monitors. Generally, small components are easily damaged. To give a few examples, such as fuse, input inductor, Zener diode, or switch tube.
2. In the LCD screen repair, the motherboard cpu caused the failure, such as the power can not start, etc. From the point of view of principle, this part is also relatively simple in principle. Generally, the key board is used to connect to the cpu, and then the cpu outputs a control signal to drive the power supply to convert the integrated circuit to work.
3. The display screen turns black when it lights up, but the related power indicator light is always on. A situation like this is the action of the protection circuit caused by a high-voltage abnormality. In this situation, there will be a display on the LCD screen, which can be seen by squinting. There are also important points to repair, which is to compare repair methods. At present, our common LCD screen high-voltage board designs are symmetrical, and it is impossible for both sides to be broken. Furthermore, the old machine is prone to problems with the step-up transformer or the lamp tube, while the new machine has many problems in the protection circuit and process.
4. There is a problem of bright or even dark lines on the screen, which is generally a problem with the LCD screen. The bright line failure is caused by the problem of the cable connection to the LCD screen. The dark line is caused by the leakage of the screen itself. It can be said that the above two situations basically have no maintenance value. The price of replacing a screen can be about the same as buying a new one.
5. Frozen or white screen appears, which is caused by a problem with the screen drive voltage. But if the screen drive circuit is on the motherboard, that is the reason for the motherboard. If the drive circuit is on the LCD screen, the screen is replaced due to the high risk of maintenance.
6. The screen has a color cast failure. This can be adjusted accordingly through the maintenance adjustment mode.
