Справочник Пользователя для Apple MD094LL/A

iMac (27-inch, Mid 2010) Symptom Charts — Mechanical 

 2010-09-09

7.  Remove fans and rotate 

blades. Verify if fan blades spin 

smoothly without interference 

from fan housing.

Yes

Go to step 8

No

Replace affected fan.

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.

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.

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.

No

All parts verified. Verify that 

correct symptom flow is 

being used.