 Apple Technician Guide - tim.id.au

2010-08-05
No/Poor Wireless Signal
Unlikely cause: power adapter, battery, speakers, optical drive, hard drive, fan, camera,
microphone, top case
Quick Check
Symptom Quick Check
No/Poor Wireless Signal
• Unable to find networks
• Intermittent connection
dropouts
• Slow transfer speeds
Deep Dive
1. Check for nearby interference sources in the
2.4/5GHz range such as microwave ovens and
cordless phones (Knowledge Base HT1365).
2. Check that computer is within base station range
– move closer to base station.
3. Base station checks:
a. Base station is not set to low-power
transmission mode
b. Base station is not using unsupported
connection and encryption protocols
c. Check for possible Wi-Fi channel overlap
(nearby base stations using adjacent channel)
4. Isolate OS by booting from original install media
(10.5.x). Attempt to connect to base station.
Check Result Action Code
1. Open System Profiler, check to
see if AirPort card is recognized
under Network: AirPort Card.
2. Run Clamshell Service
Diagnostic utility and check
that all devices are found. If
not reseat the camera cable
connection to the logic board.
Yes Use Software Update to make
sure all AirPort software and
firmware updates have been
applied. Ensure base station
is not using MAC address
filtering or creating a hidden
network.
No If card is not detected, go to
previous Symptom - AirPort/
Bluetooth - Defective wireless
devices.
Yes Loose logic board connection N04
No Go to step 3.
MacBook Pro (15-inch, 2.53 GHz, Mid 2009) Symptom Charts — Communications 63