(First check whether the adapter or other power cables are faulty or have poor contact.)
一、No backlight, no display:1.Is the PC power switch turned on?
Reason：The customer is unaware of the PC power switch.
Solution：Press the PC power button to turn on the computer.
2.Power supply is normal, PC power button light does not illuminate, motherboard red light.
Reason:
Motherboard defect.
Solution:Replace the motherboard.
3.Store data.
Reason:Motherboard storage capacity is full
Solution:Battery discharge (remove the battery for about 5 seconds, then reinsert it)
4.RAM Installation (Computer)
Reason:Memory module loose connection, loosened due to transportation vibration
Solution:Heavy-duty truck memory module
5.RAM slot (computer)
Reason:Slot contact issue
Soluton:If there are dual card slots, you can switch to another slot.
6.High-voltage busbar
Reason：High-voltage busbar
Solution：Replacement
7.Backlight cable
Reason：Poor backlighting
Solution:Replacement
8.LCD screen
Reason：LCD Screen Fault
Solution:Replacement
二、Backlight present, no display:The external monitor is displaying.
Reason：The BIOS resolution is incorrect.
Poor contact in the LCD screen cable
Solution:Flash the BIOS
Unplug the display cable. If that doesn’t work, replace the display cable. Replace the display cable.
三、Black screen after entering the system:Brightness Settings Issue
Reason:Set brightness to minimum
Solution:Increase the brightness on the external monitor.
四、Setup Issues：Whether BIOS and motherboard jumper settings are configured for power-on boot
Reason:Setting both power-on methods simultaneously will prevent the device from booting up.
Solution:Disable a power-on startup configuration method
五、After running for a period of time, a black screen restart can restore it：System
Reason：System error
Solution：Reinstall the operating system
六、Touch display：Is the keypad switch turned off?
Solution:Press the POWER button on the keypad.