Apple Applecolor Highres Rgb Mon Service Manual
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Service Source
AppleColor High-Res RGB
Monitor
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Service Source
Specifications
AppleColor High-Resolution
RGB Monitor
Specifications Characteristics - 1
Characteristics
Picture Tube
Screen Resolution
Scan Rates
13-in. viewable diagonal screen
0.26 mm aperture grille pitch
Trinitron CRT
640x480; 69 dpi
Displays up to 16.7 million colors with Macintosh Display Card
4•8, 8•24, or 8•24GC
Vertical refresh rate: 66.7 Hz
Horizontal scan rate: 35.0 kHz
Dot clock: 30.24 MHz
Specifications Characteristics - 2
Active V ideo Display Area
Input Signals
9.3 in. by 6.9 in. (235 mm by 176 mm)
Video: red, green, and blue analog signals; RS-343 standard
Specifications Controls - 3
Controls
User Controls
Adjustment Controls
Rear panel: power switch and degauss switch
Right side: brightness and contrast controls
Vertical misconvergence adjustment
Horizontal misconvergence adjustment
Specifications Physical and Electrical - 4
Physical and Electrical
Power Supply
Size and Weight
Universal power supply
Voltage: 85–270 VAC
Frequency: 47–63 Hz
Power: 90 W
Height: 11 in. (281 mm)
Width: 13.5 in. (344 mm)
Depth: 15.2 in. (385 mm)
Weight: 34 lb. (15.5 kg)
Specifications Operating Environment - 5
Operating Environment
Temperature
Humidity
Altitude
50°F–104°F (10°C–40°C)
90% maximum, noncondensing
10,000 feet (3,048 m) maximum
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Service Source
Troubleshooting
AppleColor High-Resolution
RGB Monitor
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
(condition may occur
after monitor has
been on for a few
minutes)
1 Ensure monitor’s video cable is connected to the computer or
the video card in the computer.
2 Check power cord.
3 Check internal power connectors.
4 Replace blown fuse.
5 If deflection board is Rev. A board, replace high-voltage
capacitor.
6 Replace deflection board D.
7 Replace power supply.
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 contrast and brightness knobs.
3 Check power supply and deflection board D connections.
4 Verify that video card in computer is working properly.
5 Replace video board C.
6 Replace video color board assembly.
7 Replace CRT.
(Continued)
Troubleshooting Symptom Charts/Geometry - 4
Geometry
Raster size small/
large, short/tall,
narrow/wide
Raster not centered 1 Verify that distortion is not due to environmental conditions.
Note:
When using the Rev. A version of the High-Resolution RGB
Monitor with a Macintosh LC, the width of the raster/image area
is reduced 3/16 inch from both sides of the screen. Adjust the
horizontal size.
1 Adjust horizontal or vertical size.
2 Replace deflection board D.
3 Replace CRT.
Move monitor to another location.
2 Adjust horizontal shift or vertical shift control (as
appropriate) on video board H.
3 Replace deflection board D.
Troubleshooting Symptom Charts/Geometry
(Continued)
- 5
Geometry
Vertical linearity bad
(screen top and
bottom differ)
Raster fades in and out Replace video board C.
Abnormal/distorted
raster (other than
above)
1 Adjust V.LIN control.
2 Replace deflection board D.
1 Verify that distortion is not due to environmental conditions.
Move monitor to another location.
2 Verify that all connectors are correctly placed and secure.
3 Perform appropriate geometry adjustments.
4 Replace deflection board D.
(Continued)
Troubleshooting Symptom Charts/Synchronization - 6
Synchronization
Picture breaks into
diagonal lines
Picture rolls
vertically
Single vertical line on
screen
1 Connect another monitor to computer and verify video signal.
2 Replace deflection board D.
1 Connect another monitor to computer and verify video signal.
2 Verify that video card in computer is working properly.
3 Replace deflection board D.
1 Check yoke connectors.
2 Replace deflection board D.
3 Replace CRT.
Troubleshooting Symptom Charts/Synchronization
(Continued)
- 7
Single horizontal line
on screen
Synchronization
Note:
A thin, gray, horizontal line may be visible across the
bottom third of a lit screen. This line is inherent in the design of
Trinitron monitors. Do not replace modules.
Otherwise,
1 Check yoke connectors.
2 Replace deflection board D.
3 Replace CRT.
(Continued)
Troubleshooting Symptom Charts/Video - 8
Video
Predominant red,
blue, or green tint
Picture too dark or
too bright
1 Verify that video card in computer is working properly.
2 Check monitor-to-computer connections.
3 Perform white balance adjustments.
4 Replace video color board assembly.
5 Replace CRT.
1 Adjust brightness and contrast knobs.
2 Verify that video card in computer is working properly.
3 Set cutoff control on video board H.
4 Adjust white balance.
5 Replace video color board assembly.
6 Replace deflection board D.
Troubleshooting Symptom Charts/Video
(Continued)
- 9
Video
Cannot adjust
brightness or
contrast
Picture out of focus 1 Adjust focus control on video board H.
1 Replace video color board assembly.
2 Replace contrast control board J.
2 Replace deflection board D.
3 Replace video board C.
4 Replace video color board assembly.
5 Replace CRT.
(Continued)
Troubleshooting Symptom Charts/Video
(Continued)
- 10
Picture out of focus
with color-shadowed
characters
Video
Note:
problem. (If you see no color and the display is fuzzy or the
characters on the focus pattern are unclear, the problem is focus
rather than convergence.)
1 Perform convergence adjustment; then adjust focus control
2 Replace deflection board D.
3 Replace CRT.
(Continued)
Colors in the crosshatch pattern indicate a convergence
on video board H if necessary.
Troubleshooting Symptom Charts/Miscellaneous - 11
Miscellaneous
Intermittently shuts
down (LED does not
light)
Picture jitters or
flashes
Black screen spots
(burnt phosphors)
1 Ensure monitor’s video cable is connected to the computer or
the video card in the computer.
2 Perform cutoff adjustment.
3 Replace high-voltage capacitor.
4 Replace deflection board D.
1 Check that all ground cables are secure.
2 Verify that adjacent computer equipment is properly
grounded. Move electrical devices away from monitor.
Temporarily shut off fluorescent lights.
3 Replace deflection board D.
Replace CRT.
Troubleshooting Symptom Charts/Miscellaneous
(Continued)
- 12
Monitor emits highpitched noise
Degauss button does
not correct uneven
patches of color
Miscellaneous
Replace deflection board D.
Replace power supply.
(Continued)
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Service Source
T ak e Apart
AppleColor High-Resolution
RGB Monitor
Take Apart Rear Cover - 1
Rear Cover
No preliminary steps are
required before you begin
this procedure.
±
Rear Cover
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.
±
Warning:
grounding wriststrap until
after discharging the CRT.
Remove the four case screws
and lift off the rear cover.
This product
Never use a
Take Apart EMI Shield - 2
EMI Shield
Before you begin,
• Remove the rear cover
EMI Shield
• Discharge the CRT
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.
±
Warning:
grounding wriststrap until
after discharging the CRT.
This product
Never use a
Take Apart EMI Shield - 3
1 Remove the five screws
that secure the EMI
shield to the chassis.
±
2
EMI Shield
Anode Wire
Cable Clamp
Warning:
touch the anode wire to
remove it from the
shield.
Gently pull and twist the
shield to release the
anode wire from the
cable clamp.
Do not
Take Apart CRT Board (C Board) - 4
CRT Board (C Board)
Before you begin,
• Remove the rear cover
• Remove the EMI shield
• Discharge the CRT
±
CRT Board
(C Board)
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.
±
Warning:
grounding wriststrap until
after discharging the CRT.
This product
Never use a
Take Apart CRT Board (C Board) - 5
1 Pull off the metal video
board shield.
Video Board Shield
Take Apart CRT Board (C Board) - 6
2 Remove the screw that
secures the black
ground wires to the video
color board frame.
3 Pull the CRT board
straight off the neck of
the CRT.
4
Caution:
Excessive force
might damage the video
board B connectors. If
the connectors are
difficult to remove, slip
Ground
Wires
a jeweler’s screwdriver
between the two halves
of the connector and
carefully pry them
CRT
Board
apart.
Take Apart CRT Board (C Board) - 7
Note:
Some connector
Video Board B
locations are different on
the Rev. A and Rev. B
versions of the CRT
board.
Disconnect the following
CRT board cable
connectors from video
board B:
• Gray, 1-wire cable
CRT Board
from B22
• White, 2-wire cable
from B15
• White, 4-wire cable
from B16
• Black, 2-wire cable
from B17
Take Apart CRT Board (C Board) - 8
• Yellow, 2-wire cable
Video Board B
from B18
• Red, 2-wire cable
from B19
CRT Board
Take Apart Video Color Board - 9
Video Color Board
Before you begin,
• Remove the rear cover
• Remove the EMI shield
• Discharge the CRT
• Remove the CRT board
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.
Video Color Board
This product
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