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The monitor is a part of the closed circuit monitoring system (cctv) and is the display part of the monitoring system. It is the standard output of the monitoring system. With the monitor display, we can view the images sent from the front end. As an indispensable terminal device for video surveillance, it acts as an “eye†for monitoring personnel, and it also plays a key role in the follow-up investigation. Then, in the usual use, what to do if the LCD monitor is blank?
The first is the 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 the A/D driver board signal processing part of the chip work The voltage is 5V, so when the fault can't 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 in the input stage of the power circuit. There was a problem with the 12V to 5V power supply.
This kind of failure is very common, usually burn insurance (safety assured) or the voltage regulator chip fails, some of the machines are built-in switching power supply, output two sets of power, one set is 5V, for signal processing, another set It is 12V to provide high-voltage board point backlight. If there is a fault in the circuit of the switching power supply, it may lead to no output of both sets of power.
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.
There are many reasons for this situation. On the one hand, the MCU program may be flushed, which may result in 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. There are many places on the market that can be purchased. If the local market can't buy it, you can post it on the LCD home forum. Many LCD masters may be able to purchase the accessories you need and find the information you need.