Honeywell HMLCD19L User Manual

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Troubleshooting
Possible
Solution:
If red, green or blue are not displayed on the screen, check whether the 
display cable is properly connected.
Issue:
Sync problem between the monitor and PC
Possible
Solution:
Check if the display input signal is within the specified range (56 - 75 
Hz).
Ensure the display signal cable is connected properly between the 
monitor and the PC.