Apple Technician Guide - tim.id.au
Apple Technician Guide - tim.id.au
Apple Technician Guide - tim.id.au
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2010-08-05<br />
Noise / Hum / Vibration<br />
Unlikely c<strong>au</strong>se: RAM, display assembly, top case, camera, microphone, battery<br />
Quick Check<br />
Symptom Quick Check<br />
Noise / Hum / Vibration<br />
Computer or AC adapter emits a<br />
noise or vibration.<br />
Deep Dive<br />
1. Verify and reproduce the source of the noise from<br />
the computer / adapter with the customer.<br />
2. If the AC adapter is the source of the noise<br />
disconnect and try a known-good adapter. ( a<br />
small amount of hum or vibration is normal with<br />
AC adapters ).<br />
Check Result Action Code<br />
1. Use of a known-good AC<br />
adapter eliminates the noise/<br />
vibration.<br />
2. Verify if the noise is heard<br />
through the speakers and / or<br />
headphones.<br />
3. Disconnect any peripheral<br />
devices, cards, or cables<br />
attached to the unit. Verify the<br />
noise is gone.<br />
4. Locate the source of the noise.<br />
Is the noise from an optical<br />
drive?<br />
Yes Replace AC adapter. P04<br />
No Go to step 2<br />
Yes Go to step 3<br />
No Go to step 4<br />
Yes Check for possible ground<br />
loop.<br />
No Go to step 6<br />
Yes Check with a different media<br />
disc. Possible issue with disc<br />
label or out of balance media.<br />
If not related to media, and<br />
noise is above normal level,<br />
replace optical drive.<br />
No Go to step 5<br />
MacBook Pro (15-inch, 2.53 GHz, M<strong>id</strong> 2009) Symptom Charts — Startup and Power Issues 55<br />
J04
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