Apple Macintosh Color Display

The Apple Macintosh Color Display was released in conjunction with the Macintosh IIvi and Macintosh IIvx computers. The Macintosh Color Display 16-inch and 21-inch models were also introduced in 1992 with resolutions of 832 x 624 and 1152 x 870.

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Apple Macintosh Color Display

The Apple Macintosh Color Display features a color 14-inch display (13-inch viewable area) Trinitron CRT (0.26 mm dot pitch).

Release Dates

• Introduction: October 19, 1992.
• Released: December 12, 1992.

Specifications

• Display type: Trinitron CRT. Viewable Size: 11.5-inch (total size 14.0-inch, in some documents 13-inch is stated as viewable area).
• Maximum display colors: 16.7 million.
• Dot/Pixel pitch: 0.26 mm.
• Resolution: 640 x 480 (35 kHz horizontal scan, 66.7 vertical scan).
• Display cable: Standard Macintosh video cable DB-15 for complete functionality.
• Power: 55 Watts.
• MacOS support: 7.1+.
• Input signals: Red, green, blue analog signals. Separate synchronization, negative-going TTL.
• User controls: Front panel: brightness, contrast controls, power switch.
• Dimensions: 13.0 height x 13.4 width x 14.0 depth.
• Weight: 24.0 lbs including video and power cables (up to 25.0 lbs according to some sources).
• Operating Environment: Temperature 50°–95°F (10°–40°C). Humidity 95% maximum, noncondensing.

Apple Orders, Discontinuation, Price

Model number: M1212.

Discontinued: August 1, 1993 (the last units were manufactured in September 1993).

Original price: US$589.

Troubleshooting

Troubleshooting Symptom Charts/No Raster: No raster, LED off

1. Check power cable connections and power switch.
2. Check all connections on main board.
3. Replace blown fuse.
4. Replace main board.

Troubleshooting Symptom Charts/No raster, LED on, CRT filament on

1. Adjust contrast and brightness knobs.
2. Connect a working monitor and verify that built-in video signal or video card is working properly.
3. Check all connections on main board. Make sure video connector is secure and wires are inside plastic connector.
4. Perform video adjustments.
5. Replace main board.
6. Replace CRT.

Troubleshooting Symptom Charts/Geometry – Raster too short, tall, narrow, or wide

1. Adjust vertical or horizontal size controls.
2. Replace main board.

Troubleshooting Symptom Charts/Geometry – Raster not centered

1. Move unit away from monitors, fluorescent lights, or other electrical equipment.
2. Adjust vertical or horizontal center controls.
3. Replace main board.

Horizontal linearity bad (size of text differs at sides of screen)

• Replace main board.

Vertical linearity bad (size of text differs at top vs. bottom of screen)

• Replace main board.

Abnormal or distorted raster

1. Move unit away from monitors, fluorescent lights, or other electrical equipment.
2. Perform geometry adjustments.
3. Replace main board.
4. Replace CRT (rarely required).

Entire raster is tilted

1. Move unit away from monitors, fluorescent lights, or other electrical equipment.
2. Perform geometry adjustments.
3. Perform yoke adjustments.
4. Replace main board.

Synchronization – Picture breaks into diagonal lines

1. Connect a working monitor and verify that built-in video signal or video card is working properly.
2. Replace main board.

Synchronization – Picture rolls vertically

1. Connect known-good monitor and verify that built-in video signal or video card is working properly.
2. Replace main board.

Synchronization -Picture breaks and rolls horizontally

1. Connect a working monitor and verify that built-in video signal or video card is working properly.
2. Replace main board.

Synchronization – Black raster with single vertical or horizontal line

1. Replace main board.
2. Replace CRT.

Video – Raster too dark, too bright, or washed out

1. Adjust external contrast and brightness controls.
2. Connect a working monitor and verify that built-in video signal or video card is working properly.
3. Perform video adjustments.
4. Replace main board.
5. Replace CRT (very rarely required).

Video – Out of focus

1. Perform focus adjustment.
2. Replace main board.
3. Adjust focus controls to their limits. If bad focus remains on one part of display, replace CRT.

Video – Predominant color tint

1. Check video card in computer.
2. Perform video adjustments.
3. Replace main board.
4. Replace CRT (if you cannot eliminate red, green, or blue tint).

Video – Out of convergence (color bleeding out from text or lines)

1. Connect a working monitor and verify that built-in video signal or video card is working properly.
2. Perform convergence adjustments. Refer to “Video” in Adjustments chapter.
3. Replace main board.
4. Replace CRT.

Troubleshooting – Miscellaneous – Picture jitters or flashes

1. Move unit away from monitors, fluorescent lights, or other electrical equipment.
2. Check that all ground cables are secure.
3. Replace main board.

Troubleshooting – Miscellaneous – Intermittently shuts down

• Replace main board.

Troubleshooting – Miscellaneous – Flashing or wavy screen

• Replace main board.

Troubleshooting – Miscellaneous – Black screen spots (burnt phosphors)

• Replace CRT.

Troubleshooting – Miscellaneous – Monitor emits high-pitched noise

• Replace main board.

Troubleshooting – Miscellaneous – Does not degauss

• Replace main board

Troubleshooting – Miscellaneous – Erratic or no communication with ADB device

Replace keyboard cable, keyboard, mouse, or other ADB device.

Troubleshooting – Miscellaneous – Thin horizontal line on screen

Displays smaller than 15 inches with tron-style CRTs typically have a single horizontal grid wire about one-third of the way from the bottom of the display image. This supporting wire, which is thinner than a human hair, stabilizes the aperture grill against shocks. The line is common to all tron-style displays and is not a screen defect. It cannot be adjusted out or eliminated by repairing or replacing display modules.

Miscellanea

• The Macintosh Color Display 16-inch and 21-inch models inch were also introduced in 1992, with resolutions of 832 x 624 and 1152 x 870.
• Up to twenty minutes were required to warm-up this computer to meet all specifications.
• Apple released its Macintosh IIvx computer in October 1992. The IIvx was the first Mac to have a metal case. This model was aimed directly at the mid-range market. The IIvx introduced a new case design (it was the first case built with an internal CD-ROM in mind). The computer ran on a 32 MHz 68030 processor with a 68882 FPU. However, the 16 MHz bus made it roughly equivalent to a 25 MHz IIci. The IIvx cost $2,950. Experts say that the Mac IIvx began its life in development as a proof-of-concept to see how an internal CD-ROM drive could be added to a Mac. However, after John Sculley’s speech at MacWorld Tokyo promised a Mac with a CD-ROM drive (and surprised the development team), the IIvx was rushed into production, with a lot of shortcuts taken in its design. The 32 MHz processor was crippled by its 16 MHz bus, making it slightly slower than the IIci. Its serial port was limited to 57.6 kbps. This limit could actually cause problems with serial connections and MIDI hardware. The final nail was driven into the coffin of this model when Apple released the more powerful Centris 610 four months later for the same price. Since then, people who buy an expensive Mac which quickly becomes obsolete are said to be “IIvx’ed”.
• Apple introduced the Macintosh IIvi computer in October 1992. This model had the exact same characteristics as the Macintosh IIvx computer. But, the Macintosh IIvi had a 16 MHz 68030 processor, and had no FPU. This model was priced several hundred dollars cheaper, and was discontinued just four months later, making it one of the shortest-lived Macs ever (often a sour point to Mac IIvi owners). The Performas 600 and 600CD, which were released later in the consumer market, were based on the same motherboard as the Macintosh IIvi, but they were shipped with the IIvx’s 32 MHz processor.

Links

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