User’s Manual
28
Troubleshoot
Problem & Question
Possible Solutions
Power LED Is Not ON
Make sure the power button is ON and the Power Cord is properly
connected to a grounded power outlet and to the monitor.
No image on the screen
Is the power cord connected properly?
Check the power cord connection and power supply.
Is the video cable connected correctly?
(Connected using the HDMI cable)
Check the HDMI cable connection.
If the power is on, reboot the computer to see the initial screen (the
login screen.)
If the initial screen (the login screen) appears, boot the computer in
the applicable mode (the safe mode for Windows 7/8/10) and then
change the frequency of the video card.
(Refer to the Setting the Optimal Resolution)
If the initial screen (the login screen) does not appear, contact the
Service Center or your dealer.
Can you see “Input Not Supported” on the screen?
You can see this message when the signal from the video card
exceeds the maximum resolution and frequency that the monitor
can handle properly.
Adjust the maximum resolution and frequency that the monitor can
handle properly.
Picture Is Fuzzy & Has
Ghosting Shadowing
Problem
Adjust the Contrast and Brightness Controls.
Press hot-key (AUTO) to auto-adjust.
Make sure you are not using an extension cable or switch box. We
recommend plugging the monitor directly to the video card output
connector on the back.
Picture Bounces, Flickers Or
Wave Pattern Appears In
The Picture
Move electrical devices that may cause electrical interference as far
away from the monitor as possible.
Use the maximum refresh rate your monitor is capable of at the
resolution you are using.
Monitor Is Stuck In Active
Off-Mode”
The Computer Power Switch should be in the ON position.
The Computer Video Card should be snugly fitted in its slot.
Make sure the monitor’s video cable is properly connected to the
computer.
Inspect the monitor’s video cable and make sure no pin is bent.
Make sure your computer is operational by hitting the CAPS LOCK key
on the keyboard while observing the CAPS LOCK LED. The LED should
either turn ON or OFF after hitting the CAPS LOCK key.
Summary of Contents for DHI-LM55-F400
Page 1: ...DHI LM55 F400 User s Manual V1 0 0 ZHEJIANG DAHUA VISION TECHNOLOGY CO LTD...
Page 8: ...User s Manual II Troubleshoot 28 Cybersecurity Recommendations 30...
Page 19: ...User s Manual 11 3 2 Connecting a PC 3 2 1 Using HDMI video input 3 2 2 Using VGA input...
Page 41: ...User s Manual...