Written By Mark Wang On 24th November 2022
LCD video wall as an important security product, to promote the development of the security field has played an important role, as a video surveillance system necessary terminal product, LCD video wall with excellent display performance, high-definition picture quality effect is highly valued by users in various fields. Now we are more common for video wall signal interference for a system analysis and troubleshooting.
1. There is a strong source of interference near the system
This can be judged through investigation and understanding. If this is the reason, the solution is to strengthen the shielding of the camera, as well as the video cable pipeline grounding treatment.
2. The quality of the video transmission line is not good
Especially poor shielding performance (shielding network is not a very good quality copper wire network, or shielding network is too thin and does not play a shielding role). At the same time, the line resistance of such video lines is too large, thus causing greater attenuation of the signal is also a cause of aggravation of the failure. In addition, the characteristic impedance of this type of video cable is not 75Ω and parameters beyond the specified is also one of the reasons for the failure.
3. Due to the core of the video cable line and shielding network short circuit, breakage caused by the failure
The manifestation of this fault is in the form of deeper and more chaotic large-area mesh interference on the monitor, so that the image is all destroyed, the shape of the image and synchronization signal. This situation mostly occurs in the BNC connector or other types of video connectors. That is, when this failure phenomenon, LCD video wall is often not the whole system of the signal of each road are out of the problem, but only in those joints bad road. As long as these joints are carefully checked one by one, you can solve.
4. Caused by the power supply system power supply
In the normal power supply on the iteration of the interference signal. And this power supply on the interference signal, mostly from this grid using silicon-controlled equipment. Especially high current, high voltage silicon-controlled equipment, the pollution of the grid is very serious, which leads to the same power supply in the grid is not "clean". For example, this grid has high-powered silicon-controlled frequency regulation device, silicon-controlled rectification device, silicon-controlled AC-DC conversion device, etc., will produce pollution of the power supply. The solution to this situation is relatively simple, as long as the entire system of LCD video wall using purified power supply or online UPS power supply can basically be solved.
5. The space radiation interference introduced by the transmission line
This interference phenomenon, mostly because of the transmission system, the front end of the system or the central control room near a strong, high frequency space radiation source. The solution to this situation is a system set up, should be aware of the surrounding environment, try to avoid or away from the radiation source; another way is when the radiation source cannot be avoided front-end and center equipment to strengthen the shielding, the transmission line pipeline using steel pipe and good grounding.
6. Due to the transmission line characteristics of impedance mismatch caused by the failure phenomenon
This phenomenon is manifested in the form of a number of equally spaced vertical interference on the monitor screen, the frequency of the interference signal is basically an integer multiple of the line frequency. It can also be said that this interference phenomenon is caused by the LCD video wall system video cable characteristic impedance and distribution parameters are not in line with the requirements of the integrated. The solution generally relies on the "Beginning Of The Series Resistor" or "Terminal and Connected Resistance" method to solve.
A Chinese leading Digital Signage Solutions manufacturer since 2010, CY Digital Signage is a high-tech company that integrates manufacturing, R&D and sales, specializing in commercial display solutions. With 12 years of manufacturing experience focusing on commercial displays, CY Digital Signage products have been sold to more than 100 countries, mainly in Southeast Asia, Europe, America, Oceania and Middle East countries.
We have gotten very good feedback from our overseas customers: whether it is network advertising displays, touch displays or all-in-one kiosks. We support OEM, SKD and customization services. There are abundant production lines with over 200 models designed to meet the different needs of our customers. Our solutions are widely used in indoor-outdoor, media groups, advertising, education, medical, transportation, finance, chain stores, hotels, shopping centers and other industries. Our success is driven by our focus on providing the highest quality, market-leading customer service and unparalleled industry expertise. We are a manufacturer dedicated to simplifying emerging technologies in digital signage for our customers.
Our company has won the reputation of customers with the principle of good quality, good price and good reputation, and has formed a long and good cooperation relationship with dozens of small and medium-sized enterprises. Since its establishment, we have been focusing on becoming the most trustworthy outdoor intelligent LCD equipment supplier in the eyes of our customers, and is determined to create a new type of enterprise with special features. We would love to brainstorm with you on building your next experience! Looking to buy or learn more about our outdoor kiosks please CLICK HERE or call today: 86 159 2005 4142.
Mark Wang
Mark Wang is the Chief Technology Officer at CY Digital Signage. And he has over 15 years experiences in digital signage solutions.