iMac (21.5-inch, Late 2009) Symptom Charts — Input/Output Devices 84
2010-11-18
2. Make sure no cables are
connected to external sound
input/output ports. Go to
System Preferences > Sound >
Output and verify that “Internal
speakers” is an available option.
Yes Go to step 3.
No If “Headphones” is the only
available sound output
device, replace audio cable.
If “Digital output” is the
only available sound output
device, reseat audio cable to
logic board. If issue persists,
replace audio cable.
If issue persists, replace logic
board.
L11
L11
M09
3. Go to System Preferences >
Sound > Output. Set speaker
balance 100% to LEFT speaker
and play a known-good sound
le. Verify if sound is generated
by LEFT speaker and that sound
quality is acceptable.
Yes LEFT speaker and amplier
circuitry OK. Go to step 4.
No No audio in LEFT speaker.
Go to step 7.
4. Set speaker balance 100%
to RIGHT speaker and play a
known-good sound le. Verify
if sound is generated by RIGHT
speaker and that sound quality
is acceptable.
Yes RIGHT speaker and amplier
circuitry OK. Set Balance slider
to middle. Go to step 5.
No No audio in RIGHT speaker.
Go to step 7.
5. Verify if user-reported audio
issue has been resolved.
Yes Issue no longer present.
Return system to user.
No Go to step 6.
6. Boot system from Install
DVD or another known-good
bootable volume. Verify if issue
still occurs.
Yes Go to step 7.
No Known-good boot volume
works OK. Troubleshoot for
software issue. Isolate if issue
is application-specic or a
possible OS conict.
7. Connect external speakers or
headphones to audio-out port
and play a known-good sound
le. Verify if sound quality is
acceptable.
Yes Logic board, internal
speakers, and audio-out port
functioning correctly. Return
system to user.
No Go to step 8.
8. Disconnect and carefully
inspect audio cable and
connection to logic board for
damage such as bent pins or
pinched/cut wires.
Yes Replace damaged audio
cable. If issue persists, verify if
symptom has changed.
L14
No Replace logic board. M09
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