Samsung S27D391H Screen issue, Troubleshooting Guide, 9Troubleshooting Guide

9Troubleshooting Guide

Screen issue

Issues	Solutions
The power LED is off. The screen will not switch	Check that the power cable is connected
on.	properly.
	(Refer to "2.2 Connecting and Using a PC")
The message Check Signal Cable appears.	Check that the cable is properly connected to the
	product.
	(Refer to "2.2 Connecting and Using a PC")
	Check that the device connected to the product is
	powered on.
Not Optimum Mode is displayed.	This message appears when the signal from the
	graphics card exceeds the maximum resolution or
	frequency for the product.
	Change the maximum resolution and frequency to
	suit the product performance, referring to
	Standard Signal Mode Table (page 76).
The images on the screen look distorted.	Check the cable connection to the product.
	(Refer to "2.2 Connecting and Using a PC")
The screen is not clear. The screen is blurry.	Adjust Coarse and Fine.
	Remove any accessories (video extension cable,
	etc.) and try again.
	Set the resolution and frequency to the
	recommended level. (Refer to "10.1 General")
The screen appears unstable and shaky.	Check that the resolution and frequency for the
	PC are within the range of resolution and
There are shadows or ghost images left on the
	frequency compatible with the product.
screen.
	Next, if required, change the settings, referring to
	Standard Signal Mode Table (page 76) in this
	manual and the INFORMATION menu on the
	product.
The screen is too bright. The screen is too dark.	Adjust Brightness and Contrast.
Screen color is inconsistent.	Change the COLOR settings.
The colors on the screen have a shadow and are	Change the COLOR settings.
distorted.
White does not really look white.	Change the COLOR settings.
There is no image on the screen and the power	The product is operating in power-saving mode.
LED blinks every 0.5 to 1 second.
	Press any key on the keyboard or move the
	mouse to return to normal operating mode.

9 Troubleshooting Guide 70