Apple Technician Guide - tim.id.au
Apple Technician Guide - tim.id.au
Apple Technician Guide - tim.id.au
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2008-09-18<br />
Mechanical Issues: Thermals and Enclosure<br />
Reset/Power Button Stuck<br />
Unlikely c<strong>au</strong>se: LCD, hard drive, optical drive<br />
Quick Check<br />
Symptom Quick Check<br />
Reset/Power Button Stuck<br />
• System will not power on<br />
• System sounds bootROM<br />
unlock tone during startup<br />
• System <strong>au</strong>tomatically starts up<br />
repeatedly<br />
Deep Dive<br />
1. Diagnose stuck button with SMC keyboard reset<br />
sequence.<br />
2. Check for issue occurrence on battery and on AC<br />
power.<br />
3. If on battery only, check battery using Battery<br />
Diagnostic Utility.<br />
Check Result Action Code<br />
1. Reset SMC using keyboard<br />
3 keys and power-on key.<br />
MagSafe LED can verify SMC<br />
reset. Momentary stop of<br />
battery charging will indicate<br />
SMC reset, orange LED will go<br />
green momentarily then return<br />
to orange.<br />
2. Remove battery and AC power<br />
for 30 seconds to perform a<br />
manual SMC reset. Apply AC<br />
power. Does power-on key<br />
work when pressed?<br />
Yes Keyboard reset works while<br />
holding 3 keys and toggling<br />
power-on key, multiple press<br />
and release of power-on key<br />
works to show power-on key<br />
not stuck or fixed.<br />
No SMC keyboard reset not<br />
working, suggests power-on<br />
key is open circuit or stuck<br />
down. Go to step 2.<br />
Yes SMC restored from power<br />
removal sequence. Power-on<br />
key now working properly.<br />
No Power-on key stuck or open.<br />
Go to step 3.<br />
MacBook Pro (15-inch, 2.53 GHz, M<strong>id</strong> 2009) — Symptom Charts — Mechanical Issues: Thermals and Enclosure 111