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LCD splicing screen daily maintenance must pay attention to intermittent rest, LCD splicing screen because of long-term operation is likely to make some pixels overheating, crossing the limit will lead to permanent harm, that is, people often say "bad points." Others when the LCD splicing screen does not work properly, you need to find a professional repair and maintenance can find a supplier to assist in processing. Also needing attention is to reduce bumps, the LCD screen is very fragile and has poor impact resistance. This is because the LCD splicing screen includes many components and precision glass components. Once the surface of the LCD splicing screen is found to be dirty, the correct method should be used to eradicate the dirt.

  In daily use, we sometimes encounter shortcomings such as image misunderstanding, distortion is true, the factory is not synchronized, and even no input signal. According to the senior LCD splicing manufacturer, Emperor Ai, the following shortcomings have emerged:

1, LCD splicing wall work specifications, professional LCD splicing wall input signal bump is 1 Vp-P ± 3dB (about 0.7 - 1.4 Vp - Vp - P - P), input impedance of 75 ohms. Therefore, it is assumed that the input signal attenuation, impedance mismatch, or transmission cable is too low for the input signal to be less than 0.7 p - p due to non-specification of the cable BNC head; or the camera as an output is not a specification or may access some non-standard access. Devices such as dealers, amplifiers, etc. cause input signal bumps greater than 1.4 Vp - p, which can cause image distortion, etc., and the line fields are not synchronized.

2, because the video frequency planning is relatively wide, the video signal is simply disturbed during the transmission process (including 50 hz power disturbance, electromagnetic disturbance, etc.), and then affect the image quality. Disturbance can lead to severe image misunderstandings, deformations, gutters, and line out-of-sync; therefore, in this process of monitoring and control system equipment, it is necessary for the video line to stay away from the electromagnetic disturbance source.

3. A potential difference between the host front-end device, the control device, and the terminal device may also affect the presence of race or image caused by distortion of the video signal or image signal, assuming that the entire system is accessed when powered (ie, the front-end device, the control device) And the terminal device is connected to the front and back devices in a country's power access BNC head), probably because the potential difference between the ground wire of the front-end device (actually the cable shield) causes a fire, and the fire is on fire. Ground the clinker for severely damaged component inputs or PCB ground wiring. The input is open and the input image is not lost. Therefore, it is necessary to establish a monitoring system in strict accordance with the planning and construction specifications. The grounding busbar should be satisfactory for the cross-sectional area of the copper conductor, ensuring that the ground-to-ground resistance < 1 Ω before and after, the grounding wire must not constitute a closed loop, and may not be zero or rigid grid lines are short or mixed.

Common shortcomings and treatment methods:

  Common Symptom 1: The phenomenon of “clutter” or “noise” appears on the LCD screen.

  Processing method: The above situation is likely to be caused by the loose connection between the LCD splicing screen and the graphics card. As long as the connection cable is firmly connected, the situation of "clutter" and "noise" can be improved.

  Common Symptom 2: Irregular, continuous horizontal stripes appear on the screen

  The processing method is to check whether the graphics card is over-overclocked. If the graphics card is over-clocked, the above situation often occurs. At this time, the over-frequency bump should be properly lowered, but be careful, firstly, the frequency of the memory should be lowered.

  Common Symptom 3: If there is a flower screen, but the above two strokes failed to work after the application

  Processing method, after the above situation occurs on the LCD splicing screen, the user has to check the quality of the graphics card. The user can check whether the anti-electromagnetic interference and electromagnetic shielding quality of the graphics card pass. The specific method is to keep some components that may cause electromagnetic interference as far as possible from the graphics card device (such as the hard disk), and then see if the flower screen disappears. If it is determined that the electromagnetic shielding function of the graphics card is not closed, the graphics card or the self-contained shield should be replaced. There is also a way to handle the screen screen, which is to check if the device is not compatible with the graphics card driver. This situation is generally neglected, because the graphics card driver update speed is getting faster and faster, and some users always have to wait for the latest drivers of the device. In fact, some of the latest drivers are either check-in versions or versions optimized for a particular graphics card or game. Using such drivers can sometimes lead to the appearance of a screen, so users should use the drivers provided by the graphics card manufacturer whenever possible.