Specifications

iPhone 4 Symptom Charts — Sound Issues 76
2012-02-21
Headphone Issues
Known-Good Parts & Materials Required: Apple Earphones, Dock Connector to USB Cable,
computer running the latest version of iTunes with a known-good USB port
Quick Check
Symptoms Quick Check
• No sound in headphones
• Sound from only one channel
in headphones
• Distorted sound in headphones
1. If issue is with speaker audio, jump to
Speaker/Receiver Issues.
2. Verify that the headphones are fully inserted
into the headphone jack. Make sure a case or
protective lm is not interfering.
3. On the device, go to Settings > General >
Software Update to verify device has the most
up-to-date software. If unavailable, verify by
plugging the device into iTunes.
4. Check volume level with volume up/down
buttons.
5. Verify that music/audio is not paused.
6. Check Settings > Music (or iPod) > Volume Limit.
7. Go to Settings > General > Accessibility and
verify “Mono Audio” is not enabled (for those who
don’t require it.)
Deep Dive
Check Result Action
1. Clean the device.
Check that headphone jack
is not obstructed with lint or
debris. Attempt to clean any
debris in accordance with the
Cleaning Procedures.
Are you able to clean the
device?
Yes Go to step 2.
No Determine if the issue is caused by
accidental damage. Refer to the Visual
Mechanical Inspection guidelines.
2. Retest the device.
Play known-good media or go
to Settings > Sound > Ringtone
and select a ringtone.
Is the headphone issue
resolved?
Yes Issue resolved.
No Go to step 3.