About the LCD screen black screen processing method

LCD monitors are indispensable in the security industry. Since LCD monitors are designed to operate continuously for 24 hours, LCD monitors must have a high-load capacity. We also know that LCD monitors are widely used. Fortunately, there are many problems with the versatility of applications. Let's take a look at the black screen processing problem of the LCD monitor.

The first is the LCD monitor power circuit is not good caused by: the performance of the panel buttons without any reaction, the indicator light is not bright, first check the 12V voltage is good or not, followed by check 5V voltage is good, because of the A / D driver board signal processing part of the The operating voltage of the chip is 5V, so when the fault cannot be detected, first use a multimeter to measure 5V voltage. If there is no 5V voltage or 5V voltage becomes very low, then there may be a problem with the input stage of the power circuit. In other words, there is a problem with the 12V to 5V power supply.

This kind of failure is very common, usually the liquid crystal display burns the insurance or the voltage regulation chip has the breakdown, some machine is the switching power supply built-in, exports two sets of power sources, among them a group is 5V, uses in the signal processing, another group is 12V The use of high-voltage board backlight is provided. If some parts of the switching power supply circuit fail, it may result in no output of the two groups of power supplies. Another possibility is that the 5V load is getting heavier, and the 5V voltage is pulled very low. In other words, the signal processing circuit in the rear stage has a problem, some of the circuits are damaged, causing the load to increase, and the 5V voltage is pulled. Very low, one by one after the investigation of the problem of the components of the latter stage, after replacing the faulty components, 5V can be restored, the fault is generally resolved, and often encountered after 5V voltage recovery is not a good boot. This situation also has a variety of reasons. On the one hand, the MCU program may be washed out, which may cause no boot, and the MCU itself is damaged. For example, the I/O port of the MCU is damaged and the MCU cannot scan the keys. Faults caused by the MCU, find the hardware problem is useless, even if you change the MCU can not solve the problem, because the MCU is the need to program and write the Ma, in the case of no way to find the original AD driver board replacement, We can only find another way to find the A/D driver board that can be replaced.

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