Since the LCD advertising machine gained the reputation of the fifth medium, its application in various industries has become increasingly crazy. Regarding the after-sales issues in LCD advertising machines, it is necessary to find a suitable advertising machine manufacturer. In fact, after-sales service is also a part of purchasing products. However, many manufacturers are unable to solve the after-sales warranty problem for users after selling their products. Of course, this also depends on the strength of each company. So, in order to help those friends who have difficulties in after-sales maintenance, today we will talk about the troubleshooting of LCD advertising machines.

When the LCD advertising machine is turned on and off, interference noise appears on the screen. Generally, this phenomenon is caused by signal interference from the display card, which is a normal phenomenon. Users can solve it by automatically or manually adjusting the phase.

Thumb sized black spots appear on the LCD screen. This phenomenon is mostly caused by external pressure. Under the pressure of external force, the polarizing film in the LCD panel will deform. The material of this polarizing film is like aluminum foil, and it will not bounce back on its own when pressed. As a result, there will be differences in the reflection of the LCD panel, resulting in gray and dark areas that are easy to find under a white screen. Generally, the size is around ten square millimeters, which is the size of a thumb. Although this phenomenon will not affect the service life of LCD advertising screens, users still need to pay more attention and not press the LCD screen with their fingers.

The LCD advertising machine has no sound. After this issue occurs, users can first open the back cover of the LCD advertising machine, then use a multimeter to check if the functions on the driver board are powered on, and then check if the connection of the speaker cable is normal. If the horn makes a loud noise, it indicates that the drive board of the advertising machine is damaged and needs to be replaced immediately.