iMac (21.5-inch, Late 2009) Symptom Charts — Mechanical 97
2010-11-18
8. Reinstall fans while carefully
ensuring that there are no
cables routed under or near
fan assembly that might cause
interference with fan blades.
After reassembling system
verify if noise issue is resolved.
Yes Noise issue resolved. Suspect
issue caused by interference
from wiring or possible
distortion or fan housing
when installed in system.
P04
No Go to step 9.
9. Temporarily remove LCD
display then power ON system.
Verify if source of noise can be
located. Caution: The exposed
power supply poses a serious
shock hazard. Take proper
precautions when working
around an energized system.
Yes Identify, inspect, and if
necessary replace part that
caused noise issue.
P04
No Go to step 10.
10. Disconnect these major
modules/parts (hard drive,
optical drive, fans, LCD display)
one at a time then power ON
the system. Determine if noise
issue goes away when one of
the modules is disconnected.
Caution: The exposed power
supply poses a serious shock
hazard. Take proper precautions
when working around an
energized system.
Yes Identify, inspect, and if
necessary replace part that
caused noise to disappear
when it was disconnected
from the system.
P04
No All parts veried. Verify that
correct symptom ow is
being used.
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