Apple Video Cards Service Manual
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Service Source
Video Cards
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Service Source
Troubleshooting
Video Cards
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/Video - 2
Symptom Charts
Video
Dark screen, bright
screen without
recognizable
information; or other
video problems
1 Reseat video card.
2 Reseat RAM or VRAM SIMM on video card.
3 Check cable connections.
4 Run video diagnostic tests.
5 Replace VRAM or DRAM (if socketed).
6 Replace video card.
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Service Source
Upgrades
Video Cards
Upgrades Video Card Upgrade - 1
Video Card Upgrade
Before you begin, remove
the video card.
The Macintosh II Video Card
upgrade requires 8 video
RAM chips.
Note:
The required RAM
chips are not available in an
“upgrade kit.” You must
order the chips separately.
The upgrade supports 8 bits
per pixel and up to 256
colors or shades of gray.
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