The LCD monitor occupies a very important position in the entire monitoring system. It can display the entire monitoring content in front of us in a clear and clear manner, so in the event of a malfunction, it is necessary to quickly repair the LCD monitor to ensure the entire system. stable. Let's talk about some of the problems that LCD monitors are prone to and the corresponding repair methods.
1. LCD monitor repair - no power
This is a fault that should be said to be very simple. There are two kinds of power supply and external power supply in the general LCD monitor extension.
Regardless of the power supply, its structure is much simpler than that of the crt LCD monitor. The vulnerable parts are generally small components such as fuses, input inductors, switching transistors, and Zener diodes. The rare fault is caused by the power supply of the motherboard cpu does not start, this part is actually relatively simple, that is, through the key control board to the cpu, and then through the cpu output a control signal to drive the power conversion integrated circuit work.
2. LCD monitor repair - the display will not light when it is on, but the power indicator is always on.
This kind of problem is generally caused by high voltage abnormality, which is to protect the circuit. In this case, there is usually a display on the LCD screen, and the method of viewing is "oblique". The main point of maintenance is to compare the repair method. Because the design of the high-voltage board of the current liquid crystal monitor is generally a symmetrical design, and the two sides may be substantially dead. Generally, the old machine is prone to problems with the step-up transformer and the lamp tube. The protection circuit and process problems of the new machine are much more complicated.
3. LCD monitor repair - the screen is bright or dark.
This kind of problem is generally a malfunction of the LCD screen. The bright line fault is generally connected to the LCD screen body. The dark line is generally the screen body has leakage, the above two problems are basically no maintenance value, because the price of a screen is too high. But it will not affect the life.
4. LCD monitor repair - Huaping or white screen.
This kind of problem is generally a problem with the driving voltage of the screen. If the driving circuit of the screen is on the motherboard, then it should be the fault of the motherboard. If the driving circuit of the screen is on the LCD screen, the screen should be replaced under normal circumstances. The risk is great.
5. LCD monitor repair - color cast failure.
Generally, it can be adjusted by entering the maintenance adjustment mode.
6. LCD monitor repair - fault interference.
In different working modes, the LCD monitor may have some interference, most of which is normal, and a few are brought on the circuit. Because of the special production process of the liquid crystal monitor, it is only a problem that can be detected only in the standard working mode.
Summary: The above introduces several methods of LCD monitor repair, more information about LCD monitors, please continue to pay attention to the hot security investment network.
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