What are the common problems in building advertising machines?

Thumb-sized black spots appear on the LCD screen, which are mostly caused by external force extrusion. Under the pressure of external force, the polarizer in the LCD panel will be deformed. This polarizer is like aluminum foil, it won't bounce up by itself after being pressed. This leads to the difference of reflection of LCD panel, and the gray part will appear. This part is easy to find under a white screen, and it is generally more than a dozen square millimeters in size, which is the size of a thumb. Although this phenomenon will not affect the service life of the LCD screen, users should be more careful not to press the LCD screen with their fingers. There is no display on the screen, and the indicator light on the front panel flashes. After this problem occurs, the user should check whether the monitor is firmly connected with the signal line of the computer, and check whether the socket of the signal line is damaged by broken pins and bending. The screen is black and shows "signal out of synchronization range" or "out of range", which is a thorny problem that users often see in practical applications. Generally, the signal sent by the computer is beyond the display range of the monitor, and the monitor stops working when it detects an abnormal signal.

In this regard, users can try to restart the monitor and reset the output frequency of the computer. There is no sound in lcd advertising machine. After this problem occurs, the user can first open the back cover of the advertising machine of Shang Xian equipment, use multimeter to check whether the efficacy on the driving board is electrified, and then check whether the speaker cable is connected normally. If there is a lot of speaker noise, it means that the driving board of the advertising machine has been damaged and should be replaced immediately. Lcd advertising machine's screen flashes. In daily application, lcd advertising machine screen flicker is a common problem for users. In this regard, users should first check external factors, such as the magnetic field around the equipment and the power supply voltage. If it still can't be used normally, it is necessary to conduct a comprehensive inspection of the display card driver to eliminate the program installation problem. After the above operations fail, users can also try to increase the refresh rate by 75HZ to see if it is feasible. If the above operation fails to achieve satisfactory results, professional assistance is needed, and the user needs to send the equipment to the maintenance station for inspection.