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Introduction of common faults and solutions of LCD monitor

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With peace building city expansion of market demand, more and more customers using the LCD monitor, in use process, the LCD monitor will inevitably appear all sorts of problems, the need for certain coping methods below for everyone to introduce LCD monitor common faults and solutions.

First, we try to understand the LCD monitor fault reasons, such as: on the monitor to observe the image, image distortion, distortion, line field synchronization or no input signal of the fault, the phenomenon is what causes it? If the input signal due to the cable attenuation, impedance mismatch or transmission cable BNC head is not standardized reasons, or due to camera output is not standard or access the some irregularities in the access equipment lead to the amplitude of the input signal is much larger than the professional monitors the input signal amplitudes may cause image distortion, line field synchronization phenomenon. Second, due to the wide range of video frequency, video signal in the transmission process is more susceptible to interference, thus affecting the quality of the image. Third, the front-end equipment, control of the potential difference between the host device and terminal equipment will also interfere with the video signal.

Aimed at the problems above LCD monitor, technicians recommend the following several points: 1. Pay attention to the signal input cable, resistance does not match, transmission cable BNC head of standards as well as equipment access problem; 2. In the process of the installation of the monitoring system, video line must be far away from the electric magnetic wave interference source, pay attention to the problem of video signal interference.
Maintenance problems in the LCD monitor, black is the main phenomenon of, causing black reason is the main power circuit and LCD monitor insurance burn or the failure of the voltage regulator chip.
We first look at the power supply circuit is not good due to failure: performance according to the key press panel without any reaction, indicator light is not bright, first check the 12V voltage is good or not, follow check 5V voltage good no, because the A / D drive board signal processing chip voltage is 5V, so find open fault of the machine can not, first with a multimeter multimeter is used to measure the voltage of 5V, if there is no 5V and 5V voltage becomes very low, then a May is a problem with the power supply circuit of input stage, is 12V switched to 5V power supply part out of the question.
This fault is very common, usually fuse or the failure of the voltage stabilizing chip, a section of the machine is the built-in switch power supply, two sets of power output, one group is 5V, for signal processing, another group is 12V provide high-pressure plate dot backlighting with, if switching power supply circuit malfunction could lead to two sets of power are not output. Another may be 5V load increased, pull Low Voltage 5V, for an argument is to say, level signal processing circuit is a problem, there is damage to the part of the circuit, caused by increased load, pull Low Voltage 5V, one by one investigation levels components, replace appeared fault element, 5V to restore good, general failure to resolve this regard, often encounter a 5V voltage recovery after a good can not boot. This situation also have a variety of causes, on the one hand is the MCU program has been obliterated may cause does not boot, there is the MCU itself damage, for example the MCU I / O port damage, make the MCU scanning can't button, encountered the fault caused by the MCU, to find the hardware problem is of no use and in no way to find the original ad drive plate for replacing the case, we can find another way to find a substitution of the A / D drive plate, the market has a lot of places to buy.