 Apple Technician Guide MacBook Pro (15-inch, Mid ... - tim.id.au

2010-08-05
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. Check for issue occurrence on battery and on AC
power
3. If on battery only, check battery using Battery
Diagnostic Utility
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.
2. Remove battery and AC power
for 30 seconds to perform a
manual SMC reset. Apply AC
power. Verify if power-on key
works when pressed.
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.
Yes SMC restored from power
removal sequence. Power-on
key now working properly.
No Power-on key stuck or open.
Go to step 3.
MacBook Pro (15-inch, Mid 2010) Symptom Charts — Mechanical Issues: Thermals and Enclosure 105