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Troubleshooting Symptom Charts/Miscellaneous - 40
Unit unable to enter
sleep mode
1 Verify using system 7.5.2 or later.
2 Make sure display actuator is installed
3 on CPU stiffener.
4 Replace sleep switch.
5 Replace logic board.
Note: When replacing the logic board, check that the serial port
EMI clip is attached to the bottom of the CPU stiffener. If it is
missing, replace the stiffener. On international units, also
replace the stiffener if the modem EMI clip is missing. The “CPU
Stiffener” topic in Take Apart helps you locate and identify the
two EMI clips.
Note: Perform the battery contact alignment procedure when
you replace a logic board. (See Additional Procedures, “Align
Battery Contacts.”)