AOC 540 user manual Error Message Possible Solution

	Technical Support (FAQ)	LM540
Problem	Possible Solution
Screen image is not	• Adjust the CLOCK1 and FOCUS2 settings or press the AUTO button to
centered or sized	automatically re-configure the monitor’s settings.
properly
Picture has color	• Adjust the settings for Red, Green and/or Blue colors or select a different
defects (white does	color temperature: C1 or C2.
not look white)
Poor brightness or	• The life time of the back-light is limited. After 20,000 hours, the luminance of
contrast	the light has been reduced to half of its original value.
	Please send the monitor to an authorized service agent for service.
Horizontal or vertical	• Adjust the CLOCK and FOCUS settings or press the AUTO button to
disturbances on the	automatically re-configure the monitor’s settings.
screen	• Use Win 95/98 shut-down mode.

1CLOCK (pixel frequency) controls the number of pixels scanned by one horizontal sweep. If the frequency is not correct, the screen shows vertical stripes and the picture’s width is incorrect.

2FOCUS adjusts the phase of the pixel clock signal. With a wrong phase adjustment the picture has horizontal disturbances with very light screen images.

Note: For FOCUS and CLOCK adjustment use “dot-pattern” or Win 95/98 shut-down mode pattern.

Error Message	Possible Solution
Cable not connected	• Make sure the video cable is properly connected to the computer.
	If the connector is loose, tighten the connector's two screws.
	• Inspect the video cable and make sure that none of the pins are bent.

LM540 14 17NOV04