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Troubleshooting
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7
Troubleshooting
7.1
Display Troubleshooting
Problem
Troubleshooting
Image Size is Large for the Screen
(VGA, RGBS, YPbPr, or SOG analog in-
puts only)
If the image does not appear to be the correct format, then SmartSync
must be run. To run SmartSync, press the
MENU
button. In the Picture
Menu, tap the
SCROLL
button to highlight SmartSync and tap the
button.
SmartSync will run and optimize the image display properties.
Ghosting in Characters
Ghosting in characters is usually attributed to reflections in the video
cable or source. Use a high quality cable and, if possible, lower the ver-
tical refresh rate. Lower scan rates can help eliminate reflections. Un-
like a CRT, a flat-panel will not flicker at lower refresh rates (60 Hz is op-
timal) and data update will be the same at all refresh rates.
Character Jitter
(VGA, RGBS, YPbPr, SOG analog in-
puts only)
If text characters seem to be “shaky” or bold, then Sharpness, Fre-
quency and/or Phase may require adjusting. See “Setting Frequency,
Phase and Sharpness” below.
Character Noise and Vertical Distor-
tion
(VGA, RGBS, YPbPr, or SOG analog in-
puts only)
The Frequency adjustment expands or contracts the horizontal size of
the displayed image. The displayed image may be too wide or too nar-
row and vertical banding and pixel jitter may appear in grays and light
colors. Adjust the Frequency until the image just fits the screen. Hori-
zontal position adjustment can be used to verify that Frequency is set
correctly. Line up the image on the left edge of the screen and then
shift by one “click” to the right. The image should have one column off
the screen on the right side if the Frequency is set correctly.
Testing and Adjusting Frequency
(VGA, RGBS, YPbPr, or SOG analog in-
puts only)
Using a connected laptop, open a blank text file, center the file win-
dow in the display, and set the font size and style to 8 points Regular.
Tap the Enter key to move the cursor down to the center of the page,
and then press and hold the Shift and + keys to create a row of + sym-
bols.
Inconsistent lighter or darker display variations of the + symbols is an
indication that the Frequency parameter requires adjustment. Tap the
MENU
button to open the Display Menu, tap the
button to select
the Picture Menu, then tap the
SCROLL
button to select the Frequency
parameter. Next, tap the
or
buttons to increase or decrease Fre-
quency until reaching a point where all + symbols display equally.
Note:
Sharpness and Phase are subtle adjustments best set using a dis-
play calibration program.
Black Screen
Power the display Off and On. If the logo screen appears then the dis-
play is working properly. Check if the power management feature
(DPMS) is enabled. A
Searching
message appears in the lower right
hand corner when a video source is not present.