Apple Performa 6400/180 - Manual (Page 221)

Additional Procedures Blurry Video Solution - 13
Blurry Video
Solution
If you identified a blurry
video symptom, you need to
inspect the audio/monitor
connection subassembly.
1 Remove the audio/
monitor connection
subassembly from the
computer.
2 Turn the subassembly so
you can see the area of
the monitor board
immediately behind the
monitor connector.