Product data

Clarity Visual Systems
September 1997
38
Image Problems
Follow these steps in order. Check
Symptom
the operation of the VideoWall after each step.
Image is dim
1. Verify that the VideoWall has adequate ventilation and that the
fans are working
2. Verify that the input signal is good
3. Adjust the White Level via the menu while displaying a white
video image and the Black Level while displaying a black video
image
4. Set each of the colors in the Color Balance menu to 31
5. Replace the lamp
6. Check the light path for obstructions
7. Verify that all of the mirrors are attached securely and not
cracked
Lamp ignites, but –
• No image
• Screen is all black or all white
• Image has an abnormally strong
hue of a single color
1. Verify that the correct source is selected in the Source Select
menu
2. If the image has a strong green hue:
Older Electronics (one Monitor ID switch) - verify that the
input signal is not is not setup as sync on green. If it
is, it will need to be set to use separate Horizontal and
Vertical sync pulses.
Newer Electronics (two Monitor ID switches)
MAC II - verify that the input signal is not is not setup
as sync on green. If it is, it will need to be set to use
separate Horizontal and Vertical sync pulses.
RGBS Video – enable the Sync on Green feature in
the Misc Control menu
3. Verify that the input signal is good.
VGA or MAC II – video card is outputting 640 x 480 pixels,
72 Hz or less
Composite Video – video processor settings are properly set
4. Verify that Curtain in the menu is off
5. Adjust the White Level and Black Level in the menu
6. Check the LCD ribbon cable connections at both ends. Make
sure that the cable is fully seated in the connector and that the
ZIF connectors are locked. The conductors on the cable should
be facing away from the board.
7. Verify that the LCD interconnect board is fully seated and
attached to the LCD
8. Replace the LCD Interconnect board
9. Replace the LCD cable
10. Replace the Electronics Module
11. Replace the LCD Module