Specifications

Troubleshooting Symptom Charts - 8
Miscellaneous
AppleVision software
working incorrectly
(i.e., adjusting screen
parameters has no
effect; 850 or 850AV
is not listed on the
Monitors & Sound
control panel)
1 Reinstall AppleVision software and reboot computer.
2 Verify ADB connection by using the control strip to change
resolutions.
Suspected hardware
problem because
checking cable
connections, power,
AppleVision
software, and other
front-of-screen
cures did not solve
problem
Refer to “Diagnosing a Suspected Hardware Problem” in this
chapter.
At a resolution of
1152x870, jitter or
a wavy image appears
on right side, left
side, or entire screen
Note: This symptom occurs with Power Macintosh 9600
computers using an Apple/IMS video card with any display set at
1152x870 screen resolution. The computer and the display are
working properly. However, video cards with serial numbers
lower than Fx705xxx should be replaced. Apple’s service stock
has been inspected and upgraded, so replacement video boards
should not exhibit this symptom.
Check the serial number on the video card. If it is lower than
Fx705xxx, replace the video card with a new one (Apple service
part number 661-1409).
Thin horizontal lines
on screen
Displays larger than 15 inches with tron-style CRTs typically
have two wires, each about one-quarter to one-third of the way
from the top and bottom of the display image. These supporting
wires, which are thinner than a human hair, stabilize the
aperture grill against shocks. The lines are common to all tron-
style displays and are not screen defects. They cannot be adjusted
out or eliminated by repairing or replacing display modules.