User`s guide

Troubleshooting Symptom Charts/No Raster - 4
Symptom Charts
Important: For procedures that require the monitor to be turned
on, allow the monitor to warm up for approximately 20 minutes,
unless instructed otherwise.
Important: Ensure the latest version of Apple Display software
(1.5.3 or later) is installed. (Apple Display software supersedes
and replaces AppleVision software as of version 1.5.3.)
Caution: For procedures that require a second known-good
monitor, do not use an AppleVision or ColorSync display.
Connecting a second AppleVision or ColorSync monitor could
cause the AppleVision software to operate erratically.
No Raster
No raster (screen is
black); power
indicator light on
1 Verify computer video signal by connecting a known-good
monitor. Then disconnect the known-good monitor and
reconnect the AppleVision display. Ensure the monitor’s
video cable and ADB cable are connected to the computer.
2 Adjust front panel brightness and contrast controls (they
may be set too low).
3 Check for presence of high voltage (see “Checking High
Voltage” in this chapter). High voltage is present if you hear
a rustling sound when the display is turned on or off. If high
voltage is present, refer to “AppleVision Recovery Utility
for Malfunction During Startup or Recalibration” in this
chapter.
4 Replace main deflection board. Then adjust the display (see
“Adjusting the Display after Replacing the Main Deflection
Board” in this chapter).
5 Replace CRT/video board only if the service strategy in your
region supports CRT/video board replacement.
6 US only: Call Apple Technical Support at 1-800-919-2775.