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iPhone 4 Headphone Jack & Volume Control Cable Replacement ...
https://www.ifixit.com/Guide/iPhone+4+Headphone+Jack+&+Volume+Control+Cable+Replacement/4337#:~:text=Your%20iPhone%204%20rear%20cover%20may%20have%20either,Phillips%20%23000%20screws%20next%20to%20the%20dock%20connector.
Having sound issues on your iPhone 4 or iPhone 4S? …
https://www.imore.com/having-sound-issues-your-iphone-4-or-iphone-4s-heres-how-fix-them
11 Dec 2012. If you've got an iPhone 4 or iPhone 4S that's having some issues with sound, you probably aren't alone. Issues could range from system sounds working but your iPhone not actually ringing or system sounds not working unless plugged into the headphone jack. While sound can be caused by several issues, symptoms like this are typically fixable with …
SOLVED: iPhone 4 head phone jack producing sound only …
https://www.ifixit.com/Answers/View/70724/iPhone+4+head+phone+jack+producing+sound+only+on+right+headphone
Have you checked your Settings yet? Go to Settings > General > Accessibility > then scroll down to Hearing, under where it has LED Flash, Mono Audio, and then L/R. Make sure its centered. If it isnt, do so. If it is, you have a obvious hardware issue. My settings where panned all the way to the... - iPhone 4
iPhone 4 Headphone Jack & Volume Control Cable …
https://www.ifixit.com/Guide/iPhone+4+Headphone+Jack+&+Volume+Control+Cable+Replacement/4337
Your iPhone 4 rear cover may have either two #000 Phillips screws or Apple's 5-Point "Pentalobe" screws ( second image ). Check which screws you have, and ensure you also have the correct screwdriver in order to remove them. Remove the two 3.6 mm Pentalobe or Phillips #000 screws next to the dock connector.
iPhone 4 Headphone Jack Not Working - iPhone, iPad, iPod ...
https://forums.imore.com/accessories/233523-iphone-4-headphone-jack-not-working.html
The headphone jack on the iPhone 4 can be very temperamental. They can be affected by the slightest amount of moisture - so if you've been in the rain or even a humid room, it can start to rust the contacts inside the jack. It could just be lucky that it's working again - but if the problem persists, you may need to get the jack replaced.
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