Samsung SP-M275, SP-M255, SP-M20, SP-M225, SP-M305 specifications Screen, External, Source

	Symptoms	Troubleshooting
Screen and	Cannot see picture images.	Be sure that the power cord of the projector is connected.
External		Be sure that the proper input source is selected.
Source		Check that the connectors are properly connected to the ports
		at the back of the projector.
		Check the Remote Control batteries.
		Be sure that the <Color> and<Brightness> settings are not at
		their lower limit.
	Poor color.	Adjust the <Tint> and <Contrast>.
	Images are not clear.	Adjust the focus.
		Check if the projector is too far from or too near to the screen.
	Strange noise.	If a strange sound continues, contact your Service Center.
	An operating LED is lit.	Refer to the LED Indications section.
	Lines appear on screen.	On-screen noise may occur when using your PC. Adjust the
		frequency (refresh rate) of the screen.
	No external device screen is displayed.	Check the operating status for the external device and check
		whether the adjustable menu items, such as <Brightness> and
		<Contrast> have been changed correctly in the <Mode> com-
		mand screen of the Projector menu.
	Only a blue screen appears.	Be sure to properly connect the external devices. Check the
		connection cables again.
	Screen appears in black and white or in an	As mentioned above, check the adjustable items such as
	odd color, or the screen is too dark or bright.	<Brightness>, <Contrast>, or <Color> in the menu.
		If you want to restore various settings to their factory defaults,
		run <Factory Default> from the menu.

5-1 Troubleshooting