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- Apple Color Monitors: Cause of Visible Line(s) (11/93)
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- Article Created: 18 February 1993
- Article Reviewed/Updated: 15 November 1993
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- TOPIC -----------------------------------------------------------
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- Why do some Apple color monitors have a thin line or lines across the screen?
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- DISCUSSION ------------------------------------------------------
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- When you display a white or light background on some Apple color monitors,
- you may notice a thin gray horizontal line or lines across the screen. These
- thin lines are supporting or stabilizing wires inside the CRT and are part of
- Sony's Trinitron CRT technology.
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- Apple includes a Sony Trinitron CRT in the following:
- • 13-inch High Resolution RGB Monitor
- • 14-inch Macintosh Color Display
- • Macintosh 16-inch Color Display
- • Macintosh Color Classic
- • AudioVision 14 Display
- • Macintosh TV
- • Macintosh LC 520
- • Performa 550
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- Sony Trinitron CRTs have a specially constructed aperture grill which improves
- the CRT's convergence and produces a sharp and clean image. The aperture
- grill is a grid of vertical wires located just behind the CRT screen. These
- CRTs require a horizontal stabilizing wire or wires to help support the
- aperture grill. The supporting wires, which are thinner than a human hair,
- stabilize the aperture grill against shocks.
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- The Macintosh 13-inch Hi-Res RGB Monitor and 14-inch Macintosh Color Display
- have a single support wire across the bottom third of the display. The
- Macintosh 16-inch Color Display has two support wires visible across the top
- and bottom thirds of the screen.
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- Note that these are not screen defects. Their presence cannot be adjusted out
- or eliminated by replacing modules in the monitor.
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- Article Change History:
- 11/15/93 - Updated with recent systems that have Trinitron monitors
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- Copyright 1993, Apple Computer, Inc.
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