Apple Multiple Scan 20 Display Spécifications télécharger pdf (Page 33)

Troubleshooting Symptom Charts/Video - 6

Video

Screen flickers 1 Check monitor cable connections. Thumbscrews must be

tightened securely. If a video card is used, the video cable

must be secured to the card.

2 Check for external interference by moving the monitor to

another location.

3 If using more than one monitor with a computer, move the

monitors so they are at least 18 inches apart.

4 If a video card is used, check the refresh rate. Refresh rates

below 60 Hz may cause flicker. See the video card manual to

raise the refresh rate above 60 Hz.

5 Double-check items 1 through 4.

6 Replace main deflection board and CRT/video board module.

See “Main Deflection and CRT/Video Board Module” in Take

Apart chapter. See Adjustments chapter for non-user

adjustments that might be necessary after board replacement.

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Apple Multiple Scan 20 Display Spécifications Page 33