Apple MacBook Pro 13 inch - Page 54

MacBook Pro (13-inch) Symptom Charts — Startup and Power Issues 54
2010-09-14
5. Does the cable or duckhead
have visible damage?
Yes Replace cable or duckhead. P16
No Go to step 6.
6. Check that LED on MagSafe
connector is displaying both
green (if battery charged) and
orange (when charging).
Yes Verify adapter with known-
good unit and user unit and
troubleshoot source of error.
No Replace power adapter. P03
Noise / Hum / Vibration
Unlikely cause: RAM, display assembly, top case, camera, microphone, battery
Quick Check
Symptom Quick Check
Noise / Hum / Vibration
• Computer or AC adapter emits
a noise or vibration.
1. Verify and reproduce the source of the noise from
the computer / adapter with the user.
2. If the AC adapter is the source of the noise
disconnect and try a known-good adapter (a
small amount of hum or vibration is normal with
AC adapters).
Deep Dive
Check Result Action Code
1. Use of a known-good AC
adapter eliminates the noise/
vibration.
Yes Replace AC adapter. P04
No Go to step 2.
2. Verify if the noise is heard
through the speakers and / or
headphones.
Yes Go to step 3.
No Go to step 4.
3. Disconnect any peripheral
devices, cards, or cables
attached to the unit. Verify the
noise is gone.
Yes Check for possible ground
loop.
No Go to step 6.