Samsung LS24C550VL/EN, LS24C550ML/EN, LS23C550HS/EN, LS24C550HL/ZR Not Optimum Mode is displayed

9Troubleshooting Guide

Screen issue

The message Check Signal Cable appears.	Check that the cable is properly connected to the
	product.
	(Refer to "2.3 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 87).
The images on the screen look distorted.	Check the cable connection to the product
	(Refer to "2.3 Connecting and Using a PC")
The screen is not clear. The screen is blurry.	Adjust Coarse (page 53) and Fine (page 54).
	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. Next, if
screen.
	required, change the settings, referring to
	Standard Signal Mode Table (page 87) in this
	manual and the INFORMATION menu on the
	product.
The screen is too bright. The screen is too dark.	Adjust Brightness (page 41) and
	Contrast (page 42).
Screen color is inconsistent.	Change the COLOR settings.
	(Refer to " Configuring Tint")
The colors on the screen have a shadow and are	Change the COLOR settings.
distorted.	(Refer to " Configuring Tint")
White does not really look white.	Change the COLOR settings.
	(Refer to " Configuring Tint")
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 80