Ergotron AOC LM720 - Manual (Page 14)

AOC LM720
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AOC LM720
Technical Support (FAQ)
1 CLOCK (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.
2 FOCUS 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.
Problem Possible Solution
Screen image is not
centered or sized
properly • Adjust the CLOCK 1 and FOCUS 2 settings or press the AUTO button to
automatically re-configure the monitor’s settings.
Picture has color
defects (white does
not look white) • Adjust the settings for Red, Green and/or Blue colors or select a different
color temperature: 65 (6500 K) or 78 (7800 K).
Poor brightness or
contrast • The life time of the back-light is limited. After 30,000 hours, the luminance of
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
disturbances on the
screen • Adjust the CLOCK and FOCUS settings or press the AUTO button to
automatically re-configure the monitor’s settings.
• Use Win 95/98 shut-down mode.
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.