Apple Colorsync 20 Displays Service Manual

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Service Source

20" ColorSync Displays

20” ColorSync Display (was AppleVision 850)

20” ColorSync AV Display (was AppleVision 850AV)

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Service Source

Hot Issues

20" ColorSync Displays

(AppleVision 850, 850AV)

Hot Issues Introduction - 1

Introduction

This chapter is designed to highlight unique or high­priority product issues that you should be aware of before
servicing this display.

This chapter alerts you to important issues and provides
links to other areas in the manual where more complete
information can be found. This chapter is not intended to
replace other parts of this manual; it merely provides a
pointer to pertinent information in those chapters.

Hot Issues Jittery or Blurry Video with Power Macintosh 5500/6500 - 2

Jittery or Blurry Video with Power
Macintosh 5500/6500

If the display exhibits jittery or blurry video when
connected to a Power Macintosh 5500 or 6500, suspect the
computer, not the monitor.

Video jitter affects monitors connected to computers having
a 225 or 250 MHz logic board. Jitter is evident where the
pixels shimmer or jump at the edges of the screen, windows,
or dialog boxes.

Blurry video is seen as a fuzzy image over the entire screen
on monitors set to resolutions of 832x624 and higher.

Hot Issues Jittery or Blurry Video with Power Macintosh 5500/6500 - 3

Identifying Suspect Units

Video jitter or blurry video can be caused by Power
Macintosh computers within the following serial number
ranges.

Video Jitter

• PM 5500 from TY705xxxxx to TY715xxxxx

• PM 6500 from XB708xxxxx to XB718xxxxx

Blurry Video

• PM 6500 from XB708xxxxx to XB723xxxxx

The system software on Power Macintosh 6500 computers
allows selecting monitor resolutions above 1152x870. But
these higher resolutions are not supported and cause poor
video output, such as misaligned or skewed video, low
brightness, blurriness, and so on. Monitors connected to

Hot Issues Jittery or Blurry Video with Power Macintosh 5500/6500 - 4

Power Macintosh 6500 computers should not be set to
resolutions higher than 1152x870.

Check the Monitors & Sound control panel to make sure the
resolution is set to 1152x870 or lower. For a chart of
supported monitor resolutions for the Power Macintosh
6500, see the Specifications chapter in the Performa/
Power Macintosh 6400 and 6500 Series manual on Service
Source.

Although these symptoms have never been reported for a
Power Macintosh 5500, the 225 MHz logic board used in the
Power Macintosh 6500 is also used in the 5500. Refer to
the Troubleshooting chapter in Service Source for both
Power Macintosh manuals.

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Service Source

Basics

20" ColorSync Displays

(AppleVision 850, 850AV)

Basics Product Name Change - 1

Product Name Change

The AppleVision 850 and 850AV Displays were renamed in
November, 1997.

Original Name New Name

AppleVision 850 Display 20” (19.0” VIS) ColorSync Display

AppleVision 850AV Display 20” (19.0” VIS) ColorSync AV Display

Although the body of this service manual retains the
AppleVision names, both names are shown on the title page of
each chapter. The ColorSync name change was the only
change to the product.

Note:

VIS represents the diagonal viewable image size of the

display.

Basics Overview - 2

Overview

The AppleVision 850
Display is a two-page,
Trinitron color monitor
with a diagonal viewable
image size of 19.0 inches. It
supports a variety of
resolutions, and it features
advanced controls for
accurate color rendering.

The AppleVision 850
Display works with both
Mac OS-based and Windows­based computers.

Basics Overview - 3

For information on using the display with a Windows-based
computer, refer to the user’s manual.

Features

The AppleVision 850 Display features

• Multiple screen resolutions (from 640x480 to
1600x1200)

• Fine-pitch Trinitron CRT

• AppleVision software with user-adjustable controls

• A tilt-swivel base that allows the monitor to be
positioned for optimal viewing comfort

• Power saver function

Basics Overview - 4

The AppleVision 850AV
Display shares the same
features as the AppleVision
850 Display plus it includes
a speaker enclosure and
microphone.

Basics Repair Issue: Display Service Utility - 5

Repair Issue: Display Service Utility

The Display Service Utility (on the Service Source
Companion CD: Diagnostic Utilities folder) is an application
that you can use to display video test patterns, restore
display settings, run some troubleshooting procedures, and
adjust geometry.

Within the Display Service Utility, select Pattern
Selections: AppleVision 850/850AV, and click the Adjust
Geometry button.

Clicking the Adjust Geometry button opens a screen of scroll
bars that you can use to make various geometry adjustments.
Although most of these adjustments can be duplicated by
using the Monitors & Sound control panel, high voltage can
only be adjusted with the Display Service Utility.

Basics Repair Issue: Display Service Utility - 6

High voltage is checked automatically when you click the
Adjust Geometry button. If the high voltage is out of range,
the Display Service Utility will load a nominal value.

Click the H-Focus button when you want to improve the
dynamic focus (overall focus with respect to center, sides,
and top/bottom of screen).

Refer to the Read Me document in the Display Service Utility
folder for more information.

For more information on using the Display Service Utility
for troubleshooting or adjusting the AppleVision 850 and
850AV displays, refer to the Troubleshooting chapter in this
manual.

Basics Repair Issue: TCO 95 Housing - 7

Repair Issue: TCO 95 Housing

Effective January 1998, TCO 95 plastics are used for the
20” ColorSync Display (but not the AV version). The higher
environmental rating of plastics is used for the following
housing parts:

• 076-0723 ADB Board Panel, TCO 95

• 922-3336 Front Bezel, TCO 95

• 922-3337 Rear Housing, TCO 95

• 922-3339 Top Housing, TCO 95

• 922-3341 Mid Housing, TCO 95

• 922-3343 Bottom Housing, TCO 95

• 922-3387 Blank Plate, TCO 95

Important:

identified by the TCO 95 marking on the back of the rear
housing. Replace TCO 95 housing parts like-for-like. Do not
substitute with TCO 92 parts.

ColorSync displays using TCO 95 plastics can be

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Service Source

Specifications

20" ColorSync Displays

(AppleVision 850, 850AV)

Specifications Introduction - 1

Introduction

Specifications information for this product can be found in this
chapter and also in the Spec Database, which you can access in one
of three ways:

• Launch it directly by double-clicking the Apple Spec Database
runtime alias at the top level of the Main Service Source CD.

• Select “Apple Spec Database” from the Service Source drop­down main menu.

• Click the Acrobat toolbar icon for the database, which is near
the right end of the toolbar with the letters “SP.”

Specifications Characteristics - 2

Characteristics

Picture Tube

Factory Preset Screen Resolutions

20-in. (19.0-in. viewable image) Trinitron CRT
Multiple scan
Multilayer anti-reflection panel conforms to TCO 92 guidelines

0.26-mm stripe pitch

0.25-mm grille pitch

640x480 at 60 Hz in VGA mode
640x480 at 67 Hz in Macintosh mode
640x480 at 72 Hz in VESA mode
640x480 at 75 Hz in VESA mode
640x480 at 85 Hz in VESA mode
800x600 at 56 Hz in VESA mode
800x600 at 60 Hz in VESA mode
800x600 at 72 Hz in VESA mode

Specifications Characteristics - 3

800x600 at 75 Hz in VESA mode
800x600 at 85 Hz in VESA mode
832x624 at 75 Hz in Macintosh mode
1024x768 at 60 Hz in VESA mode
1024x768 at 70 Hz in VESA mode
1024x768 at 75 Hz in VESA mode
1024x768 at 85 Hz in VESA mode
1024x768 at 87 Hz (interlaced) in IBM mode
1152x870 at 75 Hz in Macintosh mode
1280x1024 at 75 Hz in VESA mode
1280x1024 at 85 Hz in VESA mode
1600x1200 at 75 Hz in VESA mode

Input Signals

Red, green, and blue signals; separate sync
DDC clock and data signals

Specifications Characteristics - 4

Scan Rates

Cable Connector

Vertical refresh rate: 48 to 120 Hz
Horizontal scan rate: 30 to 94 kHz

Video Cable: 15-pin miniature D-type with ADB cable
VGA Adapter: Standard 15-pin VGA connector

Specifications Characteristics - 5

System Requirements

System software version 7.1 or later
Computers with 68040 microprocessors or later
AppleVision software is supported by the following computers:
PCI CPUs: 7200, 7500, 7600, 8500, 9500, 6360, 6400,

6500, 7300, 8600, 9600 or later CPUs

PowerMac CPUs: 8100/100, 8100/80AV, 7100/80, 6100/66,

6100/60AV, 6200, 6300

PowerBooks: 280c & 2300/Mini Dock/Duo Dock II, 540c, 5300,

1400, and 3400

Quadra CPUs: Q605, Q610, Q630, Q630/PowerMac Upgrade,

C650, Q650, Q650/STP, Q950, Q950/STP, 660AV, 840AV

Apple DOS-compatible CPUs: Q610/DOS, 6100/DOS, 640 DOS,

PC-compatible Pentium 100 MHz and 586 Pentium 100 MHz
PC cards on PCI CPUs.

Specifications Characteristics - 6

Monitor Timings

640x480
Resolution @ 60 Hz

Horizontal Timing Horizontal Timing
1/H: 31.5 kHz 1/H: 34.97 kHz
Back Porch: 48 dots Back Porch: 96 dots
H SYNC: 96 dots H SYNC: 64 dots
Front Porch: 16 dots Front Porch: 64 dots
1 H: 31.77 µs 1 H: 28.6 µs
1/dot: 25.175 MHz 1/dot: 30.24 MHz

Vertical Timing Vertical Timing
1 V: 16.7 ms 1 V: 15.0 ms
Back Porch: 33 H Back Porch: 39 H
V SYNC: 2 H V SYNC: 3 H
Front Porch: 10 H Front Porch: 3 H
1/V: 60 Hz 1/V: 67 Hz

640x480
Resolution @ 67 Hz

Specifications Characteristics - 7

Monitor Timings

640x480
Resolution @ 72 Hz

Horizontal Timing Horizontal Timing
1/H: 37.8 kHz 1/H: 37.5 kHz
Back Porch: 128 dots Back Porch: 120 dots
H SYNC: 40 dots H SYNC: 64 dots
Front Porch: 24 dots Front Porch: 16 dots
1 H: 26.41 µs 1 H: 26.66 µs
1/dot: 31.500 MHz 1/dot: 31.500 MHz

Vertical Timing Vertical Timing
1 V: 13.7 ms 1 V: 13.3 ms
Back Porch: 28 H Back Porch: 16 H
V SYNC: 3 H V SYNC: 3 H
Front Porch: 9 H Front Porch: 1 H
1/V: 72 Hz 1/V: 75 Hz

640x480
Resolution @ 75 Hz

Specifications Characteristics - 8

Monitor Timings

640x480
Resolution @ 85 Hz

Horizontal Timing Horizontal Timing
1/H: 43.26 kHz 1/H: 35.15 kHz
Back Porch: 80 dots Back Porch: 128 dots
H SYNC: 56 dots H SYNC: 72 dots
Front Porch: 56 dots Front Porch: 24 dots
1 H: 23.11 µs 1 H: 28.44 µs
1/dot: 36.000 MHz 1/dot: 36.000 MHz

Vertical Timing Vertical Timing
1 V: 11.8 ms 1 V: 17.8 ms
Back Porch: 25 H Back Porch: 22 H
V SYNC: 3 H V SYNC: 2 H
Front Porch: 1 H Front Porch: 1 H
1/V: 85 Hz 1/V: 56 Hz

800x600
Resolution @ 56 Hz

Specifications Characteristics - 9

Monitor Timings

800x600
Resolution @ 60 Hz

Horizontal Timing Horizontal Timing
1/H: 37.87 kHz 1/H: 48.0 kHz
Back Porch: 88 dots Back Porch: 64 dots
H SYNC: 128 dots H SYNC: 120 dots
Front Porch: 40 dots Front Porch: 56 dots
1 H: 26.40 µs 1 H: 20.80 µs
1/dot: 40.000 MHz 1/dot: 50.000 MHz

Vertical Timing Vertical Timing
1 V: 16.6 ms 1 V: 13.9 ms
Back Porch: 23 H Back Porch: 23 H
V SYNC: 4 H V SYNC: 6 H
Front Porch: 1 H Front Porch: 37 H
1/V: 60 Hz 1/V: 72 Hz

800x600
Resolution @ 72 Hz

Specifications Characteristics - 10

Monitor Timings

800x600
Resolution @ 75 Hz

Horizontal Timing Horizontal Timing
1/H: 46.87 kHz 1/H: 53.67 kHz
Back Porch: 160 dots Back Porch: 152 dots
H SYNC: 80 dots H SYNC: 64 dots
Front Porch: 16 dots Front Porch: 32 dots
1 H: 21.33 µs 1 H: 18.6 µs
1/dot: 49.5 MHz 1/dot: 56.250 MHz

Vertical Timing Vertical Timing
1 V: 13.33 ms 1 V: 11.8 ms
Back Porch: 21 H Back Porch: 27 H
V SYNC: 3 H V SYNC: 3 H
Front Porch: 1 H Front Porch: 1 H
1/V: 75 Hz 1/V: 85 Hz

800x600
Resolution @ 85 Hz

Specifications Characteristics - 11

Monitor Timings

832x624
Resolution @ 75 Hz

Horizontal Timing Horizontal Timing
1/H: 49.72 kHz 1/H: 48.36 kHz
Back Porch: 224 dots Back Porch: 160 dots
H SYNC: 64 dots H SYNC: 136 dots
Front Porch: 32 dots Front Porch: 24 dots
1 H: 20.11 µs 1 H: 20.67 µs
1/dot: 57.283 MHz 1/dot: 65.0 MHz

Vertical Timing Vertical Timing
1 V: 13.4 ms 1 V: 16.7 ms
Back Porch: 39 H Back Porch: 29 H
V SYNC: 3 H V SYNC: 6 H
Front Porch: 1 H Front Porch: 3 H

1/V: 75 Hz 1/V: 60 Hz

1024x768
Resolution @ 60 Hz

Specifications Characteristics - 12

Monitor Timings

1024x768
Resolution @ 70 Hz

Horizontal Timing Horizontal Timing
1/H: 56.47 kHz 1/H: 60.023 kHz
Back Porch: 144 dots Back Porch: 176 dots
H SYNC: 136 dots H SYNC: 96 dots
Front Porch: 24 dots Front Porch: 16 dots
1 H: 17.70 µs 1 H: 16.6 µs
1/dot: 75.000 MHz 1/dot: 78.75 MHz

Vertical Timing Vertical Timing
1 V: 14.3 ms 1 V: 13.3 ms
Back Porch: 29 H Back Porch: 28 H
V SYNC: 6 H V SYNC: 3 H
Front Porch: 3 H Front Porch: 1 H
1/V: 70 Hz 1/V: 75 Hz

1024x768
Resolution @ 75 Hz

Specifications Characteristics - 13

Monitor Timings

1024x768
Resolution @ 85 Hz

Horizontal Timing Horizontal Timing
1/H: 68.677 kHz 1/H: 35.522 kHz
Back Porch: 208 dots Back Porch: 56 dots
H SYNC: 96 dots H SYNC: 176 dots
Front Porch: 48 dots Front Porch: 8 dots
1 H: 14.561 µs 1 H: 28.15 µs
1/dot: 94.500 MHz 1/dot: 44.900 MHz

Vertical Timing Vertical Timing
1 V: 11.8 ms 1 V: 23.0 ms
Back Porch: 36 H Back Porch: 20 H
V SYNC: 3 H V SYNC: 4 H
Front Porch: 1 H Front Porch: 0 H
1/V: 85 Hz 1/V: 87 Hz

1024x768
Resolution @ 87 Hz

Specifications Characteristics - 14

Monitor Timings

1152x870
Resolution @ 75 Hz

Horizontal Timing Horizontal Timing
1/H: 68.681 kHz 1/H: 79.976 kHz
Back Porch: 144 dots Back Porch: 248 dots
H SYNC: 128 dots H SYNC: 144 dots
Front Porch: 32 dots Front Porch: 16 dots
1 H: 14.56 µs 1 H: 12.504 µs
1/dot: 100.00 MHz 1/dot: 135.000 MHz

Vertical Timing Vertical Timing
1 V: 13.3 ms 1 V: 13.3 ms
Back Porch: 39 H Back Porch: 38 H
V SYNC: 3 H V SYNC: 3 H
Front Porch: 3 H Front Porch: 1 H
1/V: 75 Hz 1/V: 75 Hz

1280x1024
Resolution @ 75 Hz

Specifications Characteristics - 15

Monitor Timings

1280x1024
Resolution @ 85 Hz

Horizontal Timing Horizontal Timing
1/H: 91.146 kHz 1/H: 93.75 kHz
Back Porch: 224 dots Back Porch: 304 dots
H SYNC: 160 dots H SYNC: 192 dots
Front Porch: 64 dots Front Porch: 64 dots
1 H: 10.971 µs 1 H: 10.667 µs
1/dot: 157.500 MHz 1/dot: 202.500 MHz

Vertical Timing Vertical Timing
1 V: 11.8 ms 1 V: 13.3 ms
Back Porch: 44 H Back Porch: 46 H
V SYNC: 3 H V SYNC: 3 H
Front Porch: 1 H Front Porch: 1 H
1/V: 85 Hz 1/V: 75 Hz

1600x1200
Resolution @ 75 Hz