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Troubleshooting Symptom Charts/Video - 13
Picture breaks into
diagonal lines, or
picture rolls
vertically or
horizontally
1 Perform geometry adjustments. Refer to “Geometry” in
Adjustments chapter.
2 Replace analog/video board assembly.
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.