Specifications

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.