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

2010-08-05
Audio: Microphone
Unlikely cause: LCD display, power supply, hard drive, optical drive, fans
Quick Check
Symptoms Quick Check
Audio: Microphone
• Microphone not working
• Microphone audio garbled
• No sound
Deep Dive
1. Launch System Preferences and select Sound/
Input options. Verify that the sound input option
is set to system’s “internal microphone”.
2. Launch System Preferences and select Sound/
Input options. Verify that the ‘Input Volume’
setting is not set at the minimum level.
3. Launch System Preferences and select Sound/
Input options. Verify that ‘Input Level’ indicator
moves when speaking into the microphone.
Check Result Action Code
1. Verify if boot chime is present
when system is powered ON.
Note: make sure audio output
preferences are not set to mute
2. Check that no cable is inserted
into the external sound input
AND output ports. Launch
System Preferences and select
Sound/Input options. Verify
if “Internal Microphone” is
proposed and selected..
3. Launch System Preferences and
select Sound/Input options.
Verify if ‘Input Volume’ is set
above minimum sensitivity.
Yes Go to step 2
No Reset Pram and retest.
Yes Go to step 3.
No If “External Microphone”
input is proposed in Sound
Input preferences, replace
logic board.
Yes Go to step 4.
No Set ‘Input Volume’ slider to the
middle position. Retest.
M09
MacBook Pro (15-inch, Mid 2010) Symptom Charts — Input/Output Devices 99