Specifications

LED Cinema Display (24-inch) Symptom Charts — Input/Output Issues 35
2010-02-08
Deep Dive: Audio Issues, Microphone
Check Result Action Code
Verify display’s USB and Mini 1.
DisplayPort connectors are
plugged into known-good
supported system.
Yes Go to step 2.
No Connect display’s USB and
Mini DisplayPort connectors
to system. Go to step 2.
Determine if user-reported 2.
issue is with display’s internal
speakers.
Yes
Go to Audio Issues: General
symptom code ow.
No Go to step 3.
Launch System Preferences and 3.
select Sound input options.
Verify that display’s internal
microphone is selected.
Yes Go to step 4.
No Select display’s internal
microphone. Retest.
Launch System Preferences and 4.
select Sound input options.
Verify that ‘Input Volume’ is set
above minimum.
Yes Go to step 5.
No Set ‘Input Volume’ slider to the
middle position. Retest.
Launch System Preferences and 5.
select Sound input options.
Verify that ‘Input Level’ indicator
moves when speaking into the
microphone.
Yes Microphone working.
Go to step 8.
No Go to step 6.
Launch System Proler and 6.
conrm that display’s USB hub
is visible.
Yes USB hub circuit OK.
Go to step 7.
No
Go to USB Issues symptom
code ow.
Disconnect USB uplink cable 7.
from logic board and all-in-one
cable’s USB connector from
system. Inspect connectors and
cable under magnication for
pinched cables and damaged/
bent pins.
Yes
Replace all-in-one cable. L14
No
Replace logic board.
Retest.
M15
Record sound sample using 8.
GarageBand or iMovie HD.
Verify sound quality is normal
during playback.
Yes Microphone OK.
No
Replace rear housing. M09