Specifications

Troubleshooting Adjusting the Display after Replacing the CRT/Video Board* - 14
Adjusting the Display after Replacing the
CRT/Video Board*
* Important: Some countries do not support replacement of the
CRT/video board. Check the service strategy in your region before
continuing this procedure.
Caution: Perform this procedure only after you’ve replaced the
CRT/video board and uploaded the parameter settings.
After replacing the CRT/video board, some adjustment is
necessary. The following steps show the procedure for
• Adjusting screen geometry
• Adjusting screen convergence
• Recalibrating white points
Adjust Geometry
If the screen is displaying keystoning, open the Display Service
Utility, select AppleVision 850/850AV pattern, and click the
Adjust Geometry button. Using the keystone slider control, you can
adjust the width of the top and bottom of the screen. If necessary,
use the Display Service Utility to make other geometry
adjustments.
Adjust Convergence
Refer to “Adjusting Screen Convergence” in this chapter,
however, perform the convergence adjustment steps in the
following order: Step 2, step 1, step 3, and step 4. If necessary,
adjust focus.
Recalibrate White Points
Caution: If the video cable is connected to a third-party video card
that uses proprietary color calibration drivers, you might need to
disable the drivers to use the AppleVision color calibration
functions.
1 After you’ve rewritten the file, as instructed in “Upload
Parameter Settings,” restart the system.
2 Open Monitors & Sound control panel, and select Color.
3 Select the default 9300 white point and click Recalibrate.
• If you later choose another white point such as 6500 or
D50, you must click Recalibrate for the changes to take
effect.
• If the display looks blurry after recalibrating, adjust