Apple Macintosh Performa 577 - Manual (Page 20)

Troubleshooting Symptom Charts/Video
(Continued)
- 3
Video
(Continued)
Single vertical or
horizontal line is
displayed
Note:
A thin, gray, horizontal line may be visible across the
bottom third of a lit screen. This line is inherent in the design of
Trinitron monitors. Do not replace modules.
Otherwise,
1 Replace analog board.
2 Replace CRT.
Predominant color
tint or color cannot be
adjusted
1 Perform video adjustments. Refer to “Video” in Adjustments
chapter.
2 Replace analog board.
3 Replace CRT if red, green, or blue cannot be turned off using
appropriate controls.