Battery problem
Check whether the battery in the device is exhausted or improperly installed. If the battery is dead, replace it with a new one. If the battery is not installed correctly, please reinstall the battery.
Backlight failure
If the backlight of the device is damaged, the screen will not light up. At this time, you can try to use the instrument in a dark environment to determine whether the problem is related to backlight. If it is a backlight problem, you can contact the manufacturer or professional maintenance personnel to replace it.
Connection problem
Check whether all wires connected to the equipment are loose or disconnected. If you find it loose or disconnected, just reconnect it.
Equipment failure
If the above measures can't solve the problem, it may be that the equipment itself is faulty. At this time, it is necessary to contact the manufacturer or professional maintenance personnel for overhaul and maintenance.
Specific analysis of specific circumstances
In short, the screen is not bright, which may be caused by battery problems, backlight failures, connection problems or equipment failures. The specific reasons need to be diagnosed according to the specific situation. If the above methods can't solve the problem, it is recommended to contact the equipment manufacturer or professional maintenance personnel for help.