User`s guide

Troubleshooting Adjusting the Display after Replacing the CRT/Video Board*/
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 1710/1710AV 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. Click the Save button to store the adjustments in
user and factory mode. Trash the AppleVision Preferences folder,
and Restart the system.
Adjust Convergence
1 Use Monitors & Sound to select Convergence and set the
convergence for the best center-of-screen appearance. Refer
to Convergence in the Adjustments chapter.
2 If center-of-screen appearance is still blurry, use a
standard hex tool to adjust H-Stat (lower left side of CRT/
video board).
3 If center-of-screen appearance is good, but the top/bottom
convergence is blurry, use the plastic adjustment tool to
adjust the top and bottom convergence (back of CRT/video
board).
4 If the screen is still blurry after adjusting convergence, one
of the CRT socket wires may be improperly secured. Refer to
the Take Apart chapter to secure the red and white wires
correctly in the socket.
5 If the screen is still blurry, check the high voltage. Refer to
“Checking High Voltage” in this chapter.