Comen K1 - Display Fault

Troubleshooting
Display fault
Fault Phenomenon
Possible Reason
Inspection and Repair
White screen during booting
Bad internal connection
Check whether the screen-related connections are good, and
reconnect the ones that are not plugged in, loose, or poorly
connected
Mainboard hardware failure
Replace the mainboard
Mainboard program problem
Re-flash the program
LCD screen failure
Replace the screen assembly
Power supply failure
Use a multimeter to check whether the input voltage of the main
board is 5V, 3.3V, and 12V. Check the corresponding power supply
components and replace them.
Black screen during booting
The power supply of the adapter is
abnormal
Use a multimeter to measure whether the adapter output is normal
15V
Internal connection exception
Check whether the connection of the power supply, screen, and key
board is normal
Abnormal power supply
Use a multimeter to check whether the input voltage of the main
board is 5V, 3.3V, and 12V. Check the corresponding power supply
components and replace them.
LCD screen failure
Replace the screen assembly
The display is abnormal, on screen it
appears: Bright lines, dark spots, snowflake
-
like highlights, white gratings, and water
ripples.
LCD screen failure
Replace the screen assembly
Display abnormal: The display content is
flickering, there are irregular lines
interfering, the display is sometimes lost,
and the display color is distorted.
LCD screen failure
Replace the screen assembly
mainboard failure
Replace the mainboard