Apple imac 17in 1ghz Servicehandbuch

Seite von 155
 iMac (17-inch Flat Panel, 1GHz)  Take Apart - 27
 Logic Board
2.
Grab the logic board by the battery retainer and the hard drive connector. Lift the 
board slightly and pull back to release the board from the bottom housing and I/O 
ports. Note:  The I/O port covers may come out with the logic board when it’s 
removed. 
3.
Remove the I/O port covers from the logic board.
Warning:  Whenever the logic board is separated from the bottom housing, you must 
install new thermal pads to three surfaces on the bottom housing. Failure to apply these 
pads whenever the logic board is separated from the bottom housing could cause these 
parts to overheat and could damage internal components. 
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board 
from the housing, it is OK to retain the same, new pads as long as they are not handled 
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces, 
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17 
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is 
firmly mated with the top base. If you do not have a torque driver, you must make 
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY. 
Failure to follow these steps could cause the computer to overheat and 
damage internal components. 
Refer to the topic “Thermal Paste Application” for detailed information.