What are the problems that lcd advertising machine display screen often encounters
Nov .17.2025
المشاهدات
1. Thumb-sized black spots appear on the LCD screen:
This phenomenon is mostly caused by external extrusion. Under the pressure of external force, the polarizer in the liquid crystal panel will be deformed. This polarizer is like aluminum foil, and it will not bounce up by itself after being depressed.
This causes the difference in reflection of the liquid crystal panel, and a gray part will appear. This part is easy to find under a white screen, and its general size is more than ten square millimeters, that is, the size of the thumb.
Although this phenomenon will not affect the service life of LCD screen, users should pay more attention not to press the LCD screen with their fingers.
2. There is no display on the screen, and the indicator light on the front panel flashes:
After this problem occurs, users should check whether the signal line of the monitor and the computer is firmly connected, and check whether the pin of the signal line is broken or bent.
3. The screen is black and displays "signal out of synchronization range" or "OUT OF RANG":
This phenomenon 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 display, and the display 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.
4. lcd advertising machine display screen didn't respond after plugging in the power supply:
Lcd advertising machine display screen's unresponsiveness after plugging in the power supply is a common problem in practical application.
In this regard, users can try to take off the advertising machine, open the back cover of the advertising machine, and check whether the special power supply is energized and whether the existing materials fall off or loose.
Specific method: whether the indicator light is on when using 10,000 yuan, if it is normal, it indicates that the power supply is electrified. After eliminating the power supply problem, users should check the power supply of the decoding board, advertising machine drive board, high voltage bar, speaker and LCD screen in turn.
5, lcd advertising machine screen flashing phenomenon:
In daily application, it is a common problem for users that lcd advertising machine screen flashes. In this regard, the user should first check the external factors such as the magnetic field and power supply voltage around the device.
If it still cannot be used normally, it is necessary to conduct a comprehensive inspection of the graphics card driver of the display to eliminate the problem of program installation.
After the above operation is invalid, users can also try to increase the refresh rate by 75HZ to see if it is feasible. If the above operations fail to achieve satisfactory results, professional assistance is needed, and users need to send the equipment to the maintenance station for inspection.
The above is the explanation of common questions about lcd advertising machine display screen, which is shared today. In the information age, the continuous improvement of industrial chain makes the "building elevator advertising machine display screen", which is known as the fifth media, gradually step into the mainstream media.
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