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Troubleshooting Symptom Charts/Video - 9
Out of convergence
(color bleeds from
text or lines)
1 This problem rarely indicates a defective module. Some
misconvergence is normal, especially around edges of screen.
Contact Apple Technical Support if you’re uncertain whether
misconvergence is within specification.
2 Replace analog/video board assembly.
Black screen spots
(burnt phosphors)
Replace CRT.
Screen jitters or
flashes
1 Refer to “First Checklist” in Troubleshooting chapter. Move
electrical devices (other monitors, scanners, and so on) away
from monitor. Temporarily shut off all fluorescent lights in
area.
2 Move unit to another room or building and check if symptom
persists.
3 Replace analog/video board assembly.