Apple Technician Guide MacBook Pro (17-inch, Early 2009) - tim.id.au

2010-06-11
Mechanical Issues: Thermals and Enclosure
Reset/Power Button Stuck
Unlikely cause: LCD, hard drive, optical drive
Quick Check
Symptom Quick Check
Reset/Power Button Stuck
• System will not power on
• System sounds bootROM
unlock tone during startup
• System automatically starts up
repeatedly
Deep Dive
1. Diagnose stuck button with SMC keyboard reset
sequence
2. Inspect keyboard connection to logic board.
3. Try logic board power-on pads to determine open
or closed power-on key. Closed circuit will not
allow on-board switch to work.
4. If stuck down or closed, remove keyboard cable
from logic board and try on board switch again to
determine if top case is defective.
5. If logic board will not power on with keyboard
cable removed, troubleshoot no power/no boot.
Check Result Action Code
1. Reset SMC using keyboard
3 keys and power-on key.
MagSafe LED can verify SMC
reset. Momentary stop of
battery charging will indicate
SMC reset, orange LED will go
green momentarily then return
to orange.
Yes Keyboard reset works while
holding 3 keys and toggling
power-on key, multiple press
and release of power-on key
works to show power-on key
not stuck or fixed.
No SMC keyboard reset not
working, suggests power-on
key is open circuit or stuck
down. Go to step 2.
MacBook Pro (17-inch, Early 2009) 108