Samsung VM55B-U 55" Video Wall Display - Manual (Page 65)

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Screen issue
The screen is not clear. The screen is blurry. Remove any accessories (video extension cable, etc) and try again.
Set the resolution and frequency to the recommended level.
The screen appears unstable and shaky. Check that the resolution and frequency of the PC and graphics card are set within a range
compatible with the product. Then, change the screen settings if required by referring to the
Additional Information on the product menu and the Standard Signal Mode Table. There are shadows or ghost images left on the screen.
The screen is too bright. The screen is too dark. Adjust Brightness and Contrast .
White does not really look white. Go to Picture and adjust the White Balance Settings settings.
The product will turn off automatically. Go to System and make sure Sleep Timer is set to Off .
If a PC is connected to the product, check the power status of the PC.
Make sure the power cable is connected properly to the product and power outlet.
If the signal from a connected device is not detected, the product automatically turns off after
10 to 15 minutes.
Picture quality of the product is different from the dealer
shop where it was purchased. Use an HDMI cable to obtain high-definition (HD) picture quality.