Apple Portrait Display Service Manual
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Macintosh Portrait Display
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Basics
Macintosh Portrait Display
Basics International “Series B” - 1
International “Series B”
Apple produced domestic and international versions of the
Portrait Display. The troubleshooting and repair procedures
differ for each version of the monitor. This manual covers
the domestic version only. For documentation on the Portrait
Display “Series B,” refer to the international manual.
Basics Monitor Distortion - 2
Monitor Distortion
Overview
All large-screen monitors are susceptible to distortions
caused by environmental conditions. These distortions are
Ideal Raster
usually not visible on monitors with smaller screens.
Right Edge
Not Straight
Important:
appear distorted when set up in a new environment.
Common environmentally-caused distortions are shown on
this and the following pages. Always check first for
environmental causes before attempting to repair or adjust
a monitor with a distorted raster.
Even monitors set to factory specifications may
Basics Monitor Distortion - 3
Environmental Influences
The following environmental conditions may distort the
raster of a Portrait Display:
• Proximity to metal objects, such as metal desks, file
cabinets, and bookshelves. Metal objects affect the
earth’s magnetic field. Earth magnetism usually distorts
Raster Shifted
Up and Left
Raster Shifted
Right
only the edges of the screen.
• Fluorescent lights, other monitors, or electronic
appliances such as coffee makers and copy machines.
These objects cause dynamic raster distortion, that is,
movement or jitter of the image.
Left Side
Bowed Out
Right Side
Bowed In
Basics Monitor Distortion - 4
Troubleshooting
Upper-Right Corner
Rounded
S-Shaped
Left Edge
Raster Tilted
Right
Important:
Module swapping cannot fix a monitor with
environmental distortion problems, and adjusting a monitor
with such problems alters the factory settings.
Note:
If the monitor has shifted up/down or right/left only,
go ahead and adjust it using the centering controls. However,
keep in mind that if you then move the monitor you may need
to readjust the centering controls.
Before adjusting a monitor with a distorted raster, try the
following:
• Swivel or move the monitor, or
• Remove the monitor from the building and recheck it in
another location.
Basics Monitor Distortion - 5
If the display changes (for better or worse) when you move
it to another location, the environment is the source of the
problem. Relocate the monitor or remove the distortioncausing object.
If the display does not change when you move it to another
location, continue troubleshooting the problem (refer to
Troubleshooting/Symptom Charts).
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Specifications
Macintosh Portrait Display
Specifications Characteristics - 1
Characteristics
Picture Tube
Screen Resolution
Scan Rates
15-in. diagonal screen
Phosphor EIA Type P4 (white)
Flat, square, high-contrast, antiglare surface
640x870; 80 dpi
Analog 1-, 2-, 4-, or 8-bit pixel depth; permits 256 grays at
8 bits/pixel
Vertical refresh rate: 75 Hz
Horizontal scan rate: 68.85 kHz
Dot clock: 52 MHz
Specifications Characteristics - 2
Active V ideo Display Area
Input Signal
8 in. by 10.87 in. (203 mm by 276 mm)
Video: analog; RS-343 standard
Specifications Controls and Ports - 3
Controls and Ports
User Controls
I/O Ports
Rear panel: power switch
Right side: brightness and contrast controls
Three Apple Desktop Bus (ADB) connectors
Specifications Physical and Electrical - 4
Physical and Electrical
Power Supply
Size and Weight
Universal power supply
Voltage: 90–270 VAC, self-configuring
Frequency: 47–63 Hz
Power: 75 W maximum
Height: 13.1 in. (332 mm)
Width: 11.5 in. (292 mm)
Depth: 14.9 in. (379 mm)
Weight: 35 lb. (16 kg)
Specifications Operating Environment - 5
Operating Environment
Temperature
Humidity
Altitude
50°F–95°F (10°C–35°C)
90% maximum, noncondensing
10,000 ft. (3,048 m) maximum
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Troubleshooting
Macintosh Portrait Display
Troubleshooting General/ - 1
General
The Symptom Charts included in this chapter will help you
diagnose specific symptoms related to your product. Because cures
are listed on the charts in the order of most likely solution, try
the first cure first. Verify whether or not the product continues to
exhibit the symptom. If the symptom persists, try the next cure.
(Note: If you have replaced a module, reinstall the original module
before you proceed to the next cure.)
If you are not sure what the problem is, or if the Symptom Charts
do not resolve the problem, refer to the Flowchart for the product
family.
For additional assistance, contact Apple Technical Support.
Troubleshooting Symptom Charts/No Raster - 2
Symptom Charts
No Raster
No raster, LED off 1 Ensure monitor’s video cable is connected to the computer or
the video card in the computer.
2 Check power cord connections.
3 Check internal power connections.
4 Replace blown fuse.
5 Replace power/sweep board.
6 Replace video board.
Troubleshooting Symptom Charts/No Raster
(Continued)
- 3
No Raster
No raster, LED on 1 Ensure monitor’s video cable is connected to the computer or
the video card in the computer.
2 Adjust brightness and contrast knobs.
3 Verify that video card in computer is working properly.
4 Perform video adjustments.
5 Check internal power connections.
6 Replace power/sweep board.
7 Replace CRT board.
8 Replace video board.
9 Replace CRT.
(Continued)
Troubleshooting Symptom Charts/Geometry - 4
Geometry
Raster not centered 1 Verify that distortion is not due to environmental conditions.
Move monitor to another location.
2 Perform horizontal or vertical center adjustments.
3 Replace power/sweep board.
4 Replace CRT.
Raster bulges along
top of screen
Raster stretched or
compressed at top
1 Verify that distortion is not due to environmental conditions.
Move monitor to another location.
2 Replace CRT.
1 Verify that distortion is not due to environmental conditions.
Move monitor to another location.
2 Perform vertical-linearity adjustment.
3 Replace power/sweep board.
4 Replace CRT.
Troubleshooting Symptom Charts/GeometryÊ
(Continued)
- 5
Raster short (less
than 10 7/8 in. high)
Raster narrow (less
than 8 in. wide)
Raster bowed or
barrel-shaped
Geometry
1 Perform vertical-height adjustment.
2 Replace power/sweep board.
3 Replace CRT.
1 Perform horizontal-size adjustment.
2 Replace power/sweep board.
3 Replace CRT.
1 Verify that distortion is not due to environmental conditions.
Move monitor to another location.
2 Perform video adjustment.
3 Replace power/sweep board.
4 Replace CRT.
(Continued)
Troubleshooting Symptom Charts/GeometryÊ
(Continued)
- 6
Raster pyramid
shaped (or inverted
pyramid)
Geometry
Replace CRT.
(Continued)
Troubleshooting Symptom Charts/Video Display - 7
Video Display
Picture is too dark or
too bright
Out of focus 1 Perform focus adjustments.
1 Adjust contrast and brightness knobs.
2 Verify that video card in computer is working properly.
3 Perform video adjustments.
4 Replace CRT board.
5 Replace video board.
6 Replace contrast/brightness board.
7 Replace CRT.
2 Replace power/sweep board.
3 Replace CRT.
Troubleshooting Symptom Charts/Synchronization - 8
Synchronization
Picture rolls
vertically
One thin, bright,
horizontal line
appears on screen
Picture breaks into
diagonal lines
1 Verify that video card in computer is working properly.
2 Replace power/sweep board.
1 Replace power/sweep board.
2 Replace CRT.
1 Connect another monitor to computer and verify video signal.
2 Replace power/sweep board.
Troubleshooting Symptom Charts/Miscellaneous - 9
Miscellaneous
Black spots on screen
(burnt phosphors)
Picture jitters or
flashes
Intermittently shuts
down
Replace CRT.
1 Check all ground cable connections.
2 Verify that adjacent computer equipment is properly
grounded. Move electrical devices away from monitor and
shut off fluorescent lights in area.
3 Replace power/sweep board.
1 Ensure monitor’s video cable is connected to the computer or
the video card in the computer.
2 Replace power/sweep board.
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T ak e Apart
Macintosh Portrait Display
Take Apart Rear Cover - 1
Rear Cover
Rear Cover
No preliminary steps are
required before you begin
this procedure.
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.
This product
Take Apart Rear Cover - 2
Remove the four case screws
and lift the rear cover off
the bezel.
Take Apart EMI Shield - 3
EMI Shield
Before you begin, remove
EMI Shield
the rear cover.
EMI
Shield
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.
Note:
includes two metal panels at
the top and rear of the
monitor chassis. To repair
the monitor, remove both
panels.
This product
The EMI shield
Take Apart EMI Shield - 4
1 Remove the three screws
from the rear panel of
the EMI shield.
2 Slide the rear panel
forward; then lift the
rear panel off the
chassis.
Take Apart EMI Shield - 5
3 Pull up and remove the
top panel from the
chassis.
Take Apart AC Input Assembly - 6
AC Input Assembly
Before you begin,
• Remove rear cover
• Remove EMI shield
• Discharge CRT
AC Input
Assembly
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.
This product
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