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How to Troubleshoot a Flashing LCD Screen on a POS Machine

May 20, 2024

POS machine LCD screen flickering is an occasional phenomenon, especially in some restaurants where users may connect the POS machine to the same power strip as the freezer and oven. When your POS machine LCD screen starts to flicker, the Sunany support team recommends that you try the following methods to solve the problem.

If the LCD screen flickers occasionally but recovers quickly, please check whether the LCD screen is subject to electromagnetic interference. Try to keep components that may produce electromagnetic interference away from the POS machine, and avoid connecting the POS machine to the same power line as freezers, large machinery, and other equipment.

Ensure that the cable connecting the LCD screen to the graphics card is properly connected. Make sure the connection is tight and there are no loose or dirty contacts. You can try using another VGA or HDMI cable to connect the display and the device to rule out any cable-related problems.

In the settings menu of your POS machine, verify the resolution, brightness, contrast, and refresh rate settings. Ensure that these parameters are set correctly without any abnormal values.

Check if the graphics card driver for the LCD screen is correct and up to date. Outdated drivers can cause display problems. Consider updating to the latest version of the driver.

If the above steps do not resolve the problem, the LCD screen itself may be damaged. It is advisable to test with a different display screen.

If the POS machines were purchased from Sunany and you encounter the above situation, please contact the Sunany technical support team, and we will further diagnose and provide you with help.



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