Troubleshooting Symptom Charts - 6
Corner Beam Landing icon and use the -/+ slider control
to individually adjust the color purity for the affected
corner(s). Click OK when done.
• If color blotches appear along the top or bottom of the
screen, click the Top/Bottom Beam Landing icon and use
the -/+ slider control to adjust the color purity for the
top and bottom of the screen. Click OK when done.
-
Important:
Do not use the Top/Bottom Beam Landing
control to adjust color in the corners of the screen. The
Top/Bottom Beam Landing control affects the entire
horizontal span of the top and bottom of the display
screen.
- Any time you adjust the Top/Bottom Beam Landing, check
the screen rotation. Because the position of the raster
can be affected by the top/bottom beam landing
adjustment, go back to the Geometry screen and click
Rotate to correct the screen’s rotation.
- Recheck the screen for color blotches. If color blotches
appear in the corner(s), then make the Corner Beam
Landing adjustment.
3 Degauss exterior of display with a hand-held degaussing coil.
(You can purchase a degaussing coil for about $25 at most
larger electronic parts stores.)
4 Shut down computer and monitor, and move them to an area
where there are no external speakers or large metal objects
such as benches, cabinets, etc. that could cause a stray
magnetic field. (Refer to “First Checklist” at the beginning
of this chapter.)
5 If you don’t see improvement, repeat step 3. If you don’t
have a hand-held degaussing coil, wait 20 minutes before
turning on computer and monitor, and use an internal
degaussing coil.
6 Call Apple Technical Support. (In the US, call 1-800-919-
2775, option 3.)
Screen Brightness
Screen is very bright
(monitor might shut
down)
1 Adjust front panel Brightness and Contrast controls.
2 Check high voltage as described in “Checking High Voltage”
in this chapter.
3 Call Apple Technical Support. (In the US, call 1-800-919-
2775, option 3.)
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