iMac (Early 2001) logic board part numbers 661-2425 and 661-2426 utilize a thermal pad to help cool the microprocessor. Failure to replace this pad whenever the logic board is separated from the divider panel assembly may cause the microprocessor to overheat.

Summary

iMac (Early 2001) logic board part numbers 661-2425 and 661-2426 utilize a thermal pad to help cool the microprocessor. Failure to replace this pad whenever the logic board is separated from the divider panel assembly may cause the microprocessor to overheat. Short term separation where the thermal pad is not handled excessively does not require replacement.

Symptom

If the microprocessor is damaged, the computer could randomly "freeze" or fail to turn on.

Products affected

• iMac (Early 2001)

Install a new thermal pad each time you detach the logic board from the divider panel for service. (An exception would be if you are simply testing the logic board and only detach it for a few minutes.)

Thermal Pad Installation

1. Pull the old thermal pad from the microprocessor or divider panel.

Note: Make sure the old thermal pad is removed from either the microprocessor or divider panel before reassembling the computer.

2. Remove the protective backing from either side of the new thermal pad and place it on the microprocessor.

3. Press down on the pad to make sure it has even contact without air pockets.

4. Remove the protective backing from the exposed side of the thermal pad.

5. Install the logic board back on to the divider panel.